Chongqing University

Chongqing Shangjia Electronic Co., Ltd.

Chongqing Shangjai Electronic

Hualin Xie

FuSheng Pan

Ping Li

Zhan Xu

Xinren Liao

Juncai Ma

Liang Fu

Shuchun Li

Weipeng Zhang

Provided are a method and molten salt system for recovering rare earth elements from NdFeB waste and use of ferric oxide as a raw material of a manganese-zinc ferrite. The molten salt system comprising the following components in percentage by weight: 40% of KAlFor NaAlF, 40% of KBeF, and 20% of KAlF. By adopting the three-component molten salt system of the present invention, recovery rates of rare earth elements extracted from NdFeB waste all can reach 98% or above. By adopting the three-component molten salt system, extraction temperature is 100-400° C. lower than that of all current similar halogenation methods, and extraction time is fold shorted to 1-3 h. The reduction of the extraction temperature and the shortening of the melting time greatly reduce the energy consumption of extracting rare earth elements from NdFeB waste, and the economic benefits are remarkable.

Method for recovering rare earth elements from NdFeB waste and use of ferric oxide as raw material of manganese-zinc ferrite

A method for synchronous production of manganese tetraoxide and ferric oxide for a soft magnetic material by using marine polymetallic nodules includes: 1) crushing and grinding marine manganese nodules and baking to a constant weight; thoroughly mixing with a mixed flux and roasting in a muffle furnace; 2) carrying out solid-liquid separation, washing solid-phase precipitates with water, grinding the solid, adding sulfuric acid, controlling the temperature to be below 50&#xb0; C., and vacuuming a reactor up; 3) adding a reducing agent to react at room temperature for 5-10 min, adding ammonia water to adjust the pH value to 5.5, and carrying out separation and filtering; 4) controlling the temperatures of manganese sulfate and ferric sulfate solutions to be below 50&#xb0; C., and adding ammonium sulfide; and 5) washing with deionized water, and calcining at 800-900&#xb0; C. for 1-3 s by a suspension low-temperature instantaneous firing system.

Method for synchronous production of manganese tetraoxide and ferric oxide for soft magnetic material by using marine polymetallic nodules

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Chongqing, China

Hualin Xie