Chinese Academy of Sciences

Zhengrong Niu

Bo Li

Wu Li

Yaping Dong

Haitao Feng

Shuqi Li

Xinqian Li

A method and a device for preparing a trivalent chromium salt by electrochemical oxidation of ferrochrome in an acidic system are provided. The method includes: putting ferrochrome as an anode and placing the anode into an acidic electrolyte together with a cathode, and then turning on a power supply for electrolysis reaction, until an electrolysis completion solution containing the trivalent chromium salt and a trivalent iron salt is directly prepared. Compared with the prior art, the one-step electrochemical synthesis of the trivalent chromium salt solution can be achieved without a hexavalent chromium salt stage, avoiding the generation of chromium-containing waste residue, shortening the process flow and significantly improving the production efficiency of the trivalent chromium salt; furthermore, the reaction can be carried out at room temperature and normal pressure without the use of fine chromium iron powders and a high-concentration acidic electrolyte.

Method and device for preparing trivalent chromium salt by electrochemical oxidation of ferrochrome in acidic system

A method for directly preparing a trivalent chromium compound by electrochemical oxidation of ferrochrome is provided. The method includes: putting ferrochrome as an anode, and placing the anode into an electrolyte solution containing a complexing agent together with a cathode, then turning on a power supply for electrolysis reaction so that chromium and iron in ferrochrome are directly converted into free Crand Ferespectively, allowing one of Crand feto form a stable soluble metal complex together with the complexing agent, and allowing the other of Crand Feto form a metal hydroxide solid together with OHgenerated by electrolysis reaction, so as to obtain an electrolysis completion slurry. Compared with the prior art, the present application has no hexavalent chromium salt stage, thereby shortening the process flow and avoiding the generation of chromium-containing waste residue.

Method for directly preparing trivalent chromium compound by electrochemical oxidation of ferrochrome

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Xining, China

Zhengrong Niu