Copper mattes; cement copper (precipitated copper)
Copper mattes; cement copper (precipitated copper)
Duty Rate (from China)
Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
Products classified under HTS 7401.00.00.00
Copper Matte from Smelting Operations
Copper matte is an intermediate product from copper smelting furnaces, consisting primarily of copper and iron sulfides with low precious metal content. It falls under HTS 7401.00.00.00 as a copper matte used in pyrometallurgical refining processes to produce blister copper.
Cement Copper Precipitate
Cement copper is precipitated elemental copper recovered from low-grade leach solutions using scrap iron in cementation process. Classified under HTS 7401.00.00.00 as precipitated copper, typically 50-80% pure, used as feed for further refining.
SX-EW Cement Copper Sludge
Precipitated copper sludge from solvent extraction-electrowinning (SX-EW) plant bleed streams, recovered via cementation. Falls under HTS 7401.00.00.00 as cement copper from hydrometallurgical operations.
Black Copper Matte
Initial matte product from copper smelting containing 40-50% copper, also called 'black copper' due to high iron content. HTS 7401.00.00.00 specifically includes all copper mattes regardless of grade.
Electrolytic Cement Copper
Cement copper precipitated in electrolytic tankhouse purification circuits using iron scrap. HTS 7401.00.00.00 covers this high-purity (80%+) precipitated copper used in anode casting.
Converter Blow Matte
Matte generated during final converting blow in Peirce-Smith converters, containing 72-78% copper. Falls under HTS 7401.00.00.00 as standard copper smelting intermediate product.
Ausmelt Copper Matte
Copper matte produced in Ausmelt submerged lance smelting technology, typically 65-75% Cu. Classified under HTS 7401.00.00.00 regardless of proprietary smelting method used.
Noranda Copper Matte
Matte from Noranda continuous reaction/submerged arc furnace process, 72% Cu content. HTS 7401.00.00.00 applies to all copper sulfide fusion products regardless of reactor design.
Flash Smelt Copper Matte
Copper-iron sulfide matte from Outokumpu flash smelting process, high-grade 68-72% Cu. Falls under HTS 7401.00.00.00 as standard copper smelting intermediate.
Secondary Copper Matte
Matte recovered from secondary copper smelting of scrap and dross, 55-65% Cu content. HTS 7401.00.00.00 includes recycled copper process intermediates identical to primary mattes.
Bioleach Cement Copper
Copper precipitated from bio-oxidation heap leach solutions using bacterial pre-treatment. Advanced hydrometallurgical cement copper under HTS 7401.00.00.00.
Reverberatory Copper Matte
Traditional reverberatory furnace copper matte, 45-55% Cu from older smelting technology. Still classified HTS 7401.00.00.00 despite obsolescence in modern operations.
Precious Metal Bearing Copper Matte
Copper matte containing recoverable gold, silver, and PGMs from sulfide ore smelting. Still classified under HTS 7401.00.00.00 as primary copper matte despite precious metal values.
Heap Leach Cement Copper
Precipitated copper from heap leach solutions using cementation with shredded steel. HTS 7401.00.00.00 includes this low-cost copper recovery method product from oxide ores.
High-Grade Copper Matte (70% Cu)
Converter matte containing approximately 70% copper, produced in the converting stage after matte smelting. HTS 7401.00.00.00 covers this intermediate product essential for producing copper anodes in fire refining.