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Introduction to the Volatile Chloride Method

Non-ferrous metals with a lowered boiling point are volatilized and removed in areas above 1,000°C within the rotary kiln.

The "chloride volatilization method" is a technique for removing non-ferrous metals by adding calcium chloride to a powder containing non-ferrous metal oxides (with iron oxide as the main component) to form pellets, and then subjecting them to heat treatment in a rotary kiln. This method separates and recovers non-ferrous metals from raw materials that contain both iron and non-ferrous metals, recycling each as ironmaking raw materials and non-ferrous refining raw materials. 【Features】 ■ Volatile removal of non-ferrous metals ■ An important process in resource recycling *For more details, please refer to the PDF document or feel free to contact us.

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Tohoku Univ. Technology:Recycling of Lithium-ion Battery Cathode Materials through Hydrothermal Reaction: T18-116

Expected to reduce environmental load, avoid corrosion of equipment, and shorten reaction time

 As a method for recovering valuable metals from spent LIB cathode materials, a wet scouring method is mainly used in which various metals are separated using a back extraction method using an organic solvent after leaching metal components using an acid. However, sulfuric acid and nitric acid, which are used as acids, cause a large environmental load because toxic gases are generated, and hydrogen peroxide, which is used as a reducing agent, has problems such as explosiveness and carcinogenicity. In a system without adding hydrogen peroxide, the recovery rate of metal ions decreases, so that improvement of the process is required.   In order to solve the above problems, the inventors focused on a hydrothermal reaction and examined reaction conditions such as the type of acid. As a result, they succeeded in almost completely leaching metals without using strong acids and reducing agents by using organic acids such as citric acid and the amino acid glycine. The effects of continuous operation, shortening of reaction time, and avoiding corrosion of equipment can be expected by the present invention. 

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