Waste and scrap of tungsten, molybdenum, tantalum, magnesium, cobalt, titanium, zirconium, antinomy, beryllium, chromium, thallium, cadmium

1. Scope and Applicability

This PCR applies to preparation of a saleable, composition-controlled lot of waste and scrap whose declared predominant recoverable metal or alloy is tungsten, molybdenum, tantalum, magnesium, cobalt, titanium, zirconium, antimony, beryllium, chromium, thallium, or cadmium. It covers accepted incoming scrap through receiving, weighing, characterization, sorting, route-conditional non-thermal mechanical preparation, final grading, consolidation, and loading at the preparing facility gate.

The English CPC title spells antimony as “antinomy”; this PCR interprets that term as the chemical element antimony and does not create a separate material identity. The output remains waste or scrap prepared for a metals producer; it is not recovered metal. Metallurgical recovery, roasting, smelting, melting, refining, alloy manufacture, treatment of intact batteries or electronic equipment, upstream product use, inbound collection and transport, off-site residue treatment, and downstream transport are outside the foreground boundary. A dataset shall declare whether incoming material is new scrap or post-consumer scrap and shall not combine grades, predominant metals, preparation routes, or hazardous-component states without documented representativeness.

2. Product Category Identity

Field	Value
canonical_pcr_id	pcr.metal-products-machinery-and-equipment.basic-metals.waste-and-scrap-of-tungsten-molybdenum-tantalum-magnesium-cobalt-titanium-zirconium-ant-1d9f63f4
classification_refs	CPC 3.0: 41609 (exact semantic reference; mapping acceptance is governed separately)
covered_products	Saleable waste and scrap lots predominantly containing tungsten, molybdenum, tantalum, magnesium, cobalt, titanium, zirconium, antimony, beryllium, chromium, thallium, or cadmium, including declared alloys of those metals, after grading and any required non-thermal mechanical preparation
excluded_products	Precious-metal scrap; ferrous scrap; intact batteries and accumulators; unsorted electronic equipment; metal-bearing liquids, sludges, slags, drosses, baghouse dust, and process residues that are not traded as the declared scrap grade; recovered unwrought metal; wrought articles; cermets; mixtures without a declared predominant listed metal or alloy
representative_product	A weighed and graded lot of prepared listed-metal or listed-alloy scrap meeting a declared buyer, industry, or facility specification at the scrap-preparation facility gate
production_route	Acceptance and characterization, physical sorting, conditional non-thermal size reduction or separation, final grading, consolidation, and loading; no metallurgical recovery
market_state	Bulk pieces, turnings, cuttings, clips, granules, or compacted units, with metal or alloy grade, physical form, moisture, foreign-material content, hazardous-component status, and delivery form declared

3. Reference Flow

Field	Value
What	Provide a composition-controlled secondary raw-material lot that a declared metals producer can accept for further recovery or manufacture
How much	1 kg net mass of prepared saleable waste and scrap
How well	Meets the declared metal or alloy grade and buyer, industry, or facility specification, with measured or documented moisture and foreign-material content
How long or cycle	One completed preparation batch or dispatch lot at the facility gate; no service lifetime is assigned
reference_flow_link	The normalized output reference_scrap_output from grading_dispatch

Field	Value
Reference amount	1 kg
Reference product flow	Prepared listed-metal waste and scrap
Reference flow property	Mass 93a60a56-a3c8-11da-a746-0800200b9a66
Reference unit group	Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66
Reference unit	kg
Required qualifiers	predominant listed metal or alloy and composition basis; new-scrap or post-consumer origin; source sector; physical form and particle-size class; grade or specification; gross, tare, net, moisture, and foreign-material basis; hazardous-component and depollution status; preparation route and equipment; facility geography; temporal coverage; delivery form and included packaging

When constructing a foreground data package, the items listed in Required qualifiers must be declared in dataset metadata, process notes, reference flow comment, product description, or an equivalent data package field. Missing required qualifiers make the reference flow definition incomplete for that data package.

4. Measurement and Unit Rules

rule_id	Applies to	Required property	Required unit	Rule
mu_reference_net_mass	reference product and all solid material exchanges	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	Use calibrated gross and tare measurements to obtain net mass. State whether moisture and adhering non-metallic material remain in the commercial grade; never mix dry-mass and as-received results without an explicit conversion.
mu_electricity_energy	electricity inputs	Net calorific value 93a60a56-a3c8-11da-a746-0800200c9a66	MJ	Preserve meter data in its recorded unit and convert kWh to MJ using exactly 3.6 MJ/kWh. Apply only the metered share attributable to the declared process and period.
mu_water_mass	process-water input	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	Prefer direct mass measurement. When volume is measured, convert with a documented contemporaneous density or a justified water-density value and retain the original volume record.
mu_composition_basis	metal grade, moisture, and foreign-material results	Mass fraction	kg/kg	Report each fraction on one declared wet or dry basis, identify the test or sorting method and sampling plan, and reconcile the fractions to the measured lot mass.

5. System Boundary

rule_id	Applies to	Rule	source_ids
sb_start_at_acceptance	foreground starting condition	Start the foreground boundary only after the facility has accepted, weighed, and identified the incoming listed-metal scrap. Model generation, collection, depollution required before acceptance, and inbound transport in separate upstream datasets when included by the study.	jrc-waste-treatment-bref-2018; us-epa-metal-shredders-2024
sb_include_preparation	foreground operations	Include receiving and inspection, characterization and sorting, material handling and storage, route-conditional cutting, shearing, shredding, screening or physical separation, final grading, consolidation, and loading when performed by the reporting facility.	us-epa-metal-shredders-2024
sb_exclude_recovery	downstream transformation	Exclude roasting, smelting, melting, hydrometallurgy, refining, alloy manufacture, and any other transformation that produces recovered metal rather than prepared waste or scrap.	ec-jrc-non-ferrous-metals-bref-2016
sb_route_and_residue_disclosure	conditional operations and treatment	Declare every preparation technology actually used, meter its exchanges, and link each outgoing residue to a specific treatment dataset. Do not insert a generic preparation route or a generic waste-treatment process.	jrc-waste-treatment-bref-2018; us-epa-metal-shredders-2024

Boundary Abstraction

Field	Value
declared_starting_condition	Accepted, weighed incoming scrap for which predominant listed metal or alloy, origin, physical form, contamination, hazardous-component status, and moisture basis have been recorded
starting_condition_role	Secondary-material input accepted at the scrap-preparation facility gate
product_classification_scope	Waste and scrap predominantly of one declared listed metal or alloy within the semantic boundary of this PCR; CPC 3.0 code 41609 is a classification reference, not the canonical identity
recursive_input_rule	When incoming material already satisfies this PCR category, reference its supplying dataset and record its delivered grade and state once; do not recursively rebuild the supplying preparation inside the receiving dataset
upstream_dataset_requirement	Use separate, geographically and technologically representative datasets for scrap generation or prior treatment, inbound transport, electricity and water supply, and off-site treatment of each residue when these exchanges are in the study scope
disclosure	Disclose predominant metal or alloy, source and scrap age class, acceptance criteria, physical form, sampling and analytical method, moisture and foreign-material basis, preparation route, facility location, reporting period, mass balance, residue destinations, allocation, and any excluded operation

6. Process Inventory Structure

Process Map

process_id	process_name	inclusion	inclusion_condition	role	quantitative_reference
receiving_sorting	Receiving, characterization, and sorting	required	Always included for accepted incoming scrap	Establish accepted lot identity, grade, mass, and sorted intermediate	kg sorted scrap leaving the stage
mechanical_preparation	Non-thermal mechanical preparation	conditional	Include when the accepted scrap is cut, sheared, shredded, screened, physically separated, or water-sprayed before sale	Produce the required physical form and separate non-saleable fractions	kg prepared scrap leaving the stage
grading_dispatch	Final grading, consolidation, and dispatch	required	Always included for the saleable reference lot	Verify the final grade, determine reference mass, consolidate, and load	1 kg net saleable reference product

Process: Receiving, characterization, and sorting (receiving_sorting)

Inputs

Product flows

Purchased electricity for receiving and sorting (receiving_sorting_electricity_input)

Electricity crosses the process boundary for weighing, analysis, conveyors, lighting, and powered sorting equipment. Record the metered or defensibly submetered energy attributable to accepted lots.

• Selected flow: Electricity 890a70b7-b677-4e2a-8a1b-7d017e0a10ae
• Flow property / unit: Net calorific value / MJ
• Amount rule: Metered electricity attributable to receiving, characterization, and sorting
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg net reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_receiving_sorting
• Sources: us-epa-metal-shredders-2024

Waste flows

Accepted unprepared listed-metal scrap (accepted_unprepared_scrap_input)

This is the accepted incoming physical waste stream before foreground sorting or size preparation. Record it by lot and keep the declared predominant metal or alloy, form, contamination, moisture, and origin with the mass record.

• Selected flow: Accepted unprepared listed-metal waste and scrap
• Flow property / unit: Mass / kg
• Amount rule: Net accepted mass from gross and tare measurements, reconciled to lot inventory change
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg net reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_receiving_sorting
• Sources: jrc-waste-treatment-bref-2018; us-epa-metal-shredders-2024

Elementary flows

Outputs

Product flows

Sorted listed-metal scrap intermediate (sorted_scrap_output)

This internal intermediate is the accepted listed-metal scrap after characterization and sorting but before any required size or separation treatment. Calculate it from measured batch transfers and inventory change.

• Selected flow: Sorted listed-metal scrap intermediate
• Flow property / unit: Mass / kg
• Amount rule: Calculated sorted output mass from batch transfer records and measured inventory change
• Value mode: Calculated value (calculated_value)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg net reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_receiving_sorting
• Sources: us-epa-metal-shredders-2024

Waste flows

Elementary flows

Process: Non-thermal mechanical preparation (mechanical_preparation)

Inputs

Product flows

Sorted scrap transferred to preparation (sorted_scrap_input)

This row transfers the measured sorting-stage intermediate only when mechanical preparation is used. The value shall equal the corresponding transfer out of receiving_sorting after inventory-change reconciliation.

• Selected flow: Sorted listed-metal scrap intermediate
• Flow property / unit: Mass / kg
• Amount rule: Calculated interstage transfer into the included preparation route
• Value mode: Calculated value (calculated_value)
• Specificity: Route-specific (route_specific)
• Normalization basis: per 1 kg net reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_mechanical_preparation
• Sources: us-epa-metal-shredders-2024

Purchased electricity for mechanical preparation (preparation_electricity_input)

Electricity crosses the boundary for the actually used cutting, shearing, shredding, screening, conveying, or physical separation equipment. Record zero only when the conditional process is not included, and document that route decision.

• Selected flow: Electricity 890a70b7-b677-4e2a-8a1b-7d017e0a10ae
• Flow property / unit: Net calorific value / MJ
• Amount rule: Metered or submetered electricity for the included preparation campaign
• Value mode: Foreground record (foreground_record)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg net reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_mechanical_preparation
• Sources: us-epa-metal-shredders-2024

Process water for wet separation or dust suppression (preparation_water_input)

Process water crosses the boundary only when the declared preparation route uses water for wet physical separation or dust suppression. Keep recirculated internal water outside the input until make-up water crosses the facility boundary.

• Selected flow: Process Water 94a04f7e-2d5c-41f0-b182-d54a3b373a02
• Flow property / unit: Mass / kg
• Amount rule: Metered make-up water for the included wet-separation or dust-suppression route
• Value mode: Foreground record (foreground_record)
• Specificity: Route-specific (route_specific)
• Normalization basis: per 1 kg net reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_mechanical_preparation
• Sources: us-epa-metal-shredders-2024

Waste flows

Elementary flows

Outputs

Product flows

Prepared scrap intermediate (prepared_scrap_output)

This internal intermediate is the route-conditioned scrap after the included non-thermal physical preparation. Calculate it from weighed transfers and the preparation-stage mass balance.

• Selected flow: Prepared listed-metal scrap intermediate
• Flow property / unit: Mass / kg
• Amount rule: Calculated prepared output mass after measured residues and inventory change
• Value mode: Calculated value (calculated_value)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg net reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_mechanical_preparation
• Sources: us-epa-metal-shredders-2024

Waste flows

Separated non-metallic residue (nonmetallic_separation_residue_output)

Record the one physical non-metallic residue stream separated from the declared scrap during the included preparation campaign. Do not combine it with metal-bearing fines or an off-site treatment service.

• Selected flow: Non-metallic separation residue from listed-metal scrap preparation
• Flow property / unit: Mass / kg
• Amount rule: Weighed residue dispatched from or added to on-site inventory during the campaign
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg net reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_mechanical_preparation
• Sources: us-epa-metal-shredders-2024

Metal-bearing fines from preparation (metal_bearing_fines_output)

Record separately the physically collected fines that still contain one or more declared listed metals and leave for recovery or treatment. The metal or alloy composition and destination shall accompany the mass record.

• Selected flow: Listed-metal-bearing fines from mechanical scrap preparation
• Flow property / unit: Mass / kg
• Amount rule: Weighed fines dispatched from or added to on-site inventory during the campaign
• Value mode: Foreground record (foreground_record)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg net reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_mechanical_preparation
• Sources: us-epa-metal-shredders-2024

Elementary flows

Process: Final grading, consolidation, and dispatch (grading_dispatch)

Inputs

Product flows

Prepared scrap transferred to final grading (prepared_scrap_input)

This interstage transfer is the prepared scrap supplied to final grading. When mechanical preparation is not applicable, use the reconciled sorted output from receiving_sorting and declare the bypass.

• Selected flow: Prepared listed-metal scrap intermediate
• Flow property / unit: Mass / kg
• Amount rule: Calculated interstage transfer into the dispatch lot, including a documented process bypass when applicable
• Value mode: Calculated value (calculated_value)
• Specificity: Route-specific (route_specific)
• Normalization basis: per 1 kg net reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_grading_dispatch
• Sources: us-epa-metal-shredders-2024

Purchased electricity for grading and dispatch (dispatch_electricity_input)

Electricity crosses the boundary for final analysis, weighing, consolidation, conveying, and loading equipment. Allocate shared meter data using an auditable operating-time, throughput, or submeter basis.

• Selected flow: Electricity 890a70b7-b677-4e2a-8a1b-7d017e0a10ae
• Flow property / unit: Net calorific value / MJ
• Amount rule: Metered or allocated electricity attributable to the dispatch lot
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg net reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_grading_dispatch
• Sources: us-epa-metal-shredders-2024

Waste flows

Elementary flows

Outputs

Product flows

Prepared saleable listed-metal waste and scrap (reference_scrap_output)

This is the only quantitative reference output. Normalize the complete foreground inventory to 1 kg net mass after final grade verification and retain the actual dispatch-lot mass as the unnormalized source record.

• Selected flow: Prepared listed-metal waste and scrap
• Flow property / unit: Mass / kg
• Amount rule: Exactly 1 kg after normalization by cr_reference_normalization
• Value mode: Calculated value (calculated_value)
• Specificity: Product-specific (product_specific)
• Normalization basis: 1 kg net reference product
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_grading_dispatch
• Sources: unsd-cpc-3-0-structure-2025; us-epa-metal-shredders-2024

Waste flows

Elementary flows

7. Allocation and Co-product Handling

rule_id	Applies to	Rule	source_ids
al_subdivide_first	independently measured preparation lines and grades	Avoid allocation by subdividing receiving, preparation, and dispatch operations whenever meters, batch records, or operating logs distinguish the declared metal or alloy grade and route.
al_shared_operations	electricity and shared handling	Allocate only genuinely shared operations using a causal submeter, operating-time, equipment-throughput, or handled-net-mass basis, in that preference order; report the driver and affected exchanges.
al_multiple_saleable_grades	multiple saleable scrap outputs	Keep separately weighed saleable grades as separate product outputs. If subdivision is impossible, allocate shared burdens by dry saleable mass and report a sensitivity case using economic value when price differences could change interpretation.
al_incoming_scrap_burden	incoming waste and scrap	State the study's treatment of burdens before facility acceptance. Do not silently assign zero upstream burden, avoided primary-metal credit, or end-of-life recycling credit; apply such conventions only in the downstream study and disclose them separately from this foreground inventory.
al_residue_no_credit	nonmetallic residue and metal-bearing fines	Model each outgoing stream and its receiving treatment or recovery dataset explicitly. Do not credit recovery before the receiving process and allocation convention are identified.

8. Foreground Data Collection, Calculation, and Quality Rules

Data Collection Protocols

protocol_id	process_id	flow_role	record_type	raw_fields	collection_method	unit	frequency	temporal_coverage	site_scope	aggregation_rule	quality_evidence
cp_receiving_sorting	receiving_sorting	accepted input, electricity, and sorted transfer	scale tickets, acceptance record, composition or grade test, inventory log, electricity meter	lot id; supplier and origin; gross mass; tare mass; moisture basis; predominant metal or alloy; composition result; physical form; foreign material; hazardous-component status; acceptance decision; opening and closing inventory; meter start and end	Calibrated weighing plus documented sampling, analysis, inspection, lot tracking, and submeter or defensible meter allocation	kg; mass fraction; kWh or MJ	Every accepted lot and meter interval	At least one representative continuous 12-month period or the full campaign when shorter	All receiving and sorting operations supplying the declared product	Sum accepted and transferred net masses by homogeneous declared grade and route; reconcile inventory change; sum attributable electricity and normalize after final output is known	Scale and meter calibration; sampling plan; analytical method; acceptance checklist; lot ledger; inventory reconciliation
cp_mechanical_preparation	mechanical_preparation	interstage input, electricity, water, prepared output, residue, and fines	batch transfer ticket, equipment meter, water meter, residue scale ticket, inventory log	batch id; route and equipment; input mass; output mass; residue mass; fines mass; opening and closing inventory; meter readings; water readings; recirculation state; destination	Weigh every material transfer; meter electricity and boundary-crossing make-up water for the included campaign	kg; kWh or MJ	Every preparation batch and meter interval	Same period as the represented dispatch lots	All included non-thermal mechanical preparation equipment	Reconcile input, outputs, residues, and inventory change by route; sum energy and make-up water; do not combine technologies before checking representativeness	Scale and meter calibration; route log; maintenance and downtime log; residue destination record; signed mass-balance review
cp_grading_dispatch	grading_dispatch	prepared input, dispatch electricity, and reference output	transfer ticket, final grade certificate, dispatch scale ticket, electricity meter, loading log	dispatch lot id; linked input batches; predominant metal or alloy; composition and grade; gross mass; tare mass; net mass; moisture and foreign-material basis; physical and delivery form; meter readings; customer specification; dispatch date	Calibrated final weighing, documented sampling or inspection, lot linkage, and submeter or defensible meter allocation	kg; mass fraction; kWh or MJ	Every dispatch lot and meter interval	At least one representative continuous 12-month period or the full campaign when shorter	All final grading, consolidation, and loading operations for the declared product	Aggregate only homogeneous lots meeting the same declared product boundary; normalize all linked exchanges by net saleable output mass	Scale and meter calibration; grade certificate; chain of custody; customer or facility specification; batch-to-dispatch reconciliation

Calculation Rules

rule_id	Applies to	Formula or rule	Inputs	Output	source_ids
cr_net_mass	every weighed lot or stream	net mass = gross mass - tare mass; apply a moisture or foreign-material correction only when the declared commercial basis requires it and retain both original and corrected values	gross mass; tare mass; declared basis; moisture and foreign-material results	kg net mass on the declared basis
cr_stage_mass_balance	receiving_sorting and mechanical_preparation	input + opening inventory = product transfers + nonmetallic residue + metal-bearing fines + other specifically identified outputs + closing inventory; investigate rather than allocate an unexplained imbalance	measured input, outputs, and inventory change	reconciled batch mass balance and unexplained difference
cr_electricity_conversion	all electricity inputs	electricity_MJ = electricity_kWh × 3.6	attributable metered kWh	MJ electricity
cr_water_conversion	preparation_water_input	water_mass = measured water volume × documented density; subtract measured recovered water crossing outward only if it is a separate exchange	boundary-crossing make-up volume; density; any separately measured outward recovered-water flow	kg process-water input
cr_reference_normalization	complete foreground data package	normalized exchange = reconciled exchange amount / net mass of conforming reference_scrap_output	all reconciled exchanges; dispatch-lot net saleable mass	each exchange per 1 kg reference product

Data Quality Requirements

requirement_id	Applies to	Requirement	Evidence
dq_product_identity	every represented lot	Identify the predominant listed metal or alloy, composition basis, origin, physical form, grade, preparation route, and hazardous-component state; do not use a generic mixed-metal identity.	Supplier record, acceptance record, sampling plan, test or inspection result, and grade certificate
dq_measurement	mass, electricity, water, and composition	Use calibrated devices within their valid range and retain original readings, unit conversions, uncertainty or precision information, and calibration status.	Calibration certificates, meter logs, laboratory quality records, and conversion worksheet
dq_temporal	annual or campaign dataset	Cover a representative continuous 12-month period where possible; otherwise cover the full campaign and explain seasonality, outages, stock changes, and the reason for the shorter period.	Dated lot ledger, production calendar, inventory reconciliation, and representativeness assessment
dq_completeness	facility foreground inventory	Reconcile every accepted lot to saleable outputs, specifically identified residues, fines, other physical outputs, and inventory change; investigate missing streams.	Signed process-stage and facility mass balances
dq_route_specificity	conditional mechanical preparation	Keep bypassed, sheared, shredded, screened, wet-separated, and other materially different routes separate unless a documented weighted aggregation remains representative.	Route logs, equipment records, meter allocation, and aggregation rationale
dq_destination	outgoing residue and fines	Record physical state, declared composition where relevant, waste or product status, receiver, transport handoff, and treatment or recovery route.	Scale ticket, transfer document, receiver record, and linked treatment dataset

9. Validation Rules

rule_id	Applies to	Rule	source_ids
vr_identity_complete	reference flow and foreground package	Fail validation when predominant listed metal or alloy, origin, physical form, grade or specification, moisture and foreign-material basis, hazardous-component state, preparation route, geography, or reporting period is missing.	unsd-cpc-3-0-structure-2025
vr_reference_output	reference_scrap_output	Confirm that the only quantitative reference output is exactly 1 kg after normalization and that its unnormalized dispatch-lot net mass is positive and traceable.
vr_mass_balance	each process stage and facility total	Confirm the mass-balance equation, report the signed and absolute unexplained difference, and require documented investigation against a study-defined tolerance rather than inserting a balancing flow.
vr_conditional_route	mechanical_preparation and its exchanges	Include preparation electricity, water, residues, and fines only when their specific route occurs; require an explicit bypass statement when the conditional process is omitted.	us-epa-metal-shredders-2024
vr_energy_units	electricity inputs	Recalculate each kWh-to-MJ conversion with 3.6 MJ/kWh and reject mixed-unit summation.
vr_no_double_count	interstage and upstream links	Confirm each internal transfer appears once as an output and once as the corresponding input without adding both to the facility-level net inventory, and confirm upstream supply and off-site treatment are linked rather than duplicated in the foreground process.
vr_uuid_status	reference and inventory flows	Treat UUID-empty rows as unresolved identities. Do not substitute generic metal scrap, mixed scrap, precious-metal scrap, ferrous scrap, or non-metal waste for the exact semantic flow.

10. Published Dataset Profile

Field	Value
dataset_role	secondary_dataset; may serve as a background_dataset only after representativeness and review are documented
downstream_use	Foreground process datasets and lifecycle models requiring prepared listed-metal scrap at a scrap-preparation facility gate
allowed_use	Studies whose predominant metal or alloy, grade, origin, physical form, preparation route, geography, period, moisture basis, foreign-material basis, and burden convention match the dataset
excluded_use	Generic mixed-metal scrap; precious-metal or ferrous scrap; intact batteries or electronic equipment; metallurgical recovery; substitution or avoided-primary-metal credit without a separate downstream convention; geographies or technologies lacking a representativeness assessment
required_metadata	Canonical PCR id; predominant metal or alloy and composition; new or post-consumer origin; source sector; grade or specification; physical and delivery form; moisture and foreign-material basis; hazardous-component state; preparation route and equipment; facility geography; reporting period; reference mass; allocation; source ids; unresolved UUID disclosure
required_quality_disclosure	Sampling and analytical methods; scale and meter calibration; temporal and technological coverage; batch-to-dispatch linkage; process and facility mass balances; unexplained differences; route aggregation; residue destinations; data gaps; uncertainty; review status
update_trigger	Change in predominant metal or alloy, accepted source mix, grade specification, physical form, contamination or moisture basis, preparation technology, facility, electricity or water supply, residue destination, allocation rule, reporting period, or reference-flow UUID resolution

11. Data Sources

Source id	Type	Reference	Used for
unsd-cpc-3-0-structure-2025	official_guidance	United Nations Statistics Division, CPC Version 3.0 Structure, 30 June 2025, https://unstats.un.org/unsd/classifications/Econ/Download/In%20Text/CPC_Ver_3.0_Structure_30Jun2025.csv (retrieved 2026-06-23; SHA-256 5cd2c1c4890dd6be16af48e9bb940fed48efff9865f39ff15edaa921da25fb7c)	Official CPC 41609 classification identity and hierarchy; not quantitative evidence
jrc-waste-treatment-bref-2018	official_guidance	European Commission Joint Research Centre, Waste Treatment BAT Reference Document landing page, published October 2018, https://bureau-industrial-transformation.jrc.ec.europa.eu/reference/waste-treatment-0 (retrieved 2026-09-04)	Waste reception, sampling, checking, analysis, transfer, handling, and storage process coverage
ec-jrc-non-ferrous-metals-bref-2016	official_guidance	European Commission Joint Research Centre, Non-ferrous Metals Industries BAT Reference Document landing page, adopted June 2016, https://bureau-industrial-transformation.jrc.ec.europa.eu/reference/non-ferrous-metals-industries-0 (retrieved 2026-09-04)	Distinguishing production of secondary non-ferrous metals from preparation of scrap
us-epa-metal-shredders-2024	official_guidance	U.S. Environmental Protection Agency, Best Practices for Metal Shredding Facilities in Clean Air Act Permitting, August 2024, https://19january2025snapshot.epa.gov/system/files/documents/2024-09/metal-shredders-best-practices_08-2024.pdf (retrieved 2026-09-04)	Receiving and inspection, acceptance control, sorting, size preparation, separation, material handling, water dust suppression, residue handling, grading, loading, and site-specific emissions-data requirements; not an amount range