Smelting
Smelting
Leveraging our proprietary technologies such as hydrometallurgical and pyrometallurgical smelting and metal recovery, as well as a network of multiple smelters, we recover over 20 types of metals from a variety of raw materials.
Core Technologies
Zinc Smelting Technology
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- World-leading residue treatment and impurity removal technology
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- Using a unique residue treatment technology, we recover numerous valuable metals without generating waste.
- By using our proprietary additives for impurity removal, we can produce high-purity zinc.
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- Technology capable of metal recovery not only from concentrates but also from secondary material
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- We are promoting the recycling of zinc from secondary materials.
- We have adopted a solvent extraction method with a high capacity for dealing with impurities.
Metal Separation and Recovery Technology from Recycling Materials
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- Metal separation and recovery technology from circuit boards
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- We utilize the TSL furnace (Top Submerged Lance furnace) as a recycling-specialized smelting furnace.
- By mutually utilizing KOSAKA SMELTING & REFINING’s copper and lead smelter and Akita ZINC’s zinc refinery, we express a combined function and recover a wide variety of metals.
- The adoption of the copper electrowinning method expanded the limit for dealing with high concentrations of precious metals and impurities.
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- PGM (Platinum Group Metals) recovery technology from spent catalysts
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- Sampling technology to assess PGM concentration in raw materials
- Smelting PGMs using our proprietary pyrometallurgical process.
Examples of Core Technology Applications
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- Zinc Smelting Technology
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- Representative Treatment Process
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- Technical Features: Points of Differentiation
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- By using the world's only hematite process, various valuable metals such as In can be recovered at high yields without producing any waste.
- By using unique additives, impurities can be removed at a high level with a zinc purity of 99.995% or more.
Zinc Ingot 
Indium Ingot
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- Hematite Process
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- Representative Treatment Process
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- Technical Features: Points of Differentiation
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- By using the world’s only hematite process, various valuable metals such as In can be recovered at high yields without producing any waste.
Leaching Autoclave
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- Metal Separation and Recovery Technology from circuit boards
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- Representative Treatment Process
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- Technical Features: Points of Differentiation
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- A wide variety of metals can be recovered through copper and lead composite smelting, which is mainly made from recycling materials.
- The adoption of the copper electrowinning has strengthened the ability to deal with precious metals and impurities.
- The quality of the raw materials is accurately evaluated by finely grinding the raw materials and taking samples.
- The TSL furnace (Top Submerged Lance furnace) is used as a smelting furnace specializing in recycling.
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- Metal Recovery Technology from Zinc Secondary Raw Materials
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- Representative Treatment Process
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- Technical Features: Points of Differentiation
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- We are promoting the recycling of zinc by recovering zinc from secondary raw materials such as crude zinc oxide derived from steel dusts.
- By adopting zinc recovery by solvent extraction, it has a high ability to respond to halogen-based impurities.
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- PGMs Recovery Technology from Spent Catalysts
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- Process
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- Technical Features: Points of Differentiation
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- Our advanced sampling technology allows for precise evaluation of PGM concentration by finely crushing and milling raw materials, ensuring highly representative samples.
- We utilize the ROSE process, our proprietary pyrometallurgical method for efficiently processing large volumes of PGM-containing materials in a short time.