Inorganic Chemicals Industry >
Study on new process of producing chromium salt with ferrochrome alloy
Received date: 2020-07-13
Online published: 2021-07-08
In view of the pollution problem of hexavalent chromium existing in the production of chromium salt at present,the new ferrochrome-trivalent chromic ion metallurgical-chemical combination method without hexavalent chromium pollution was introduced.In the new process,ferrochrome alloy was used as raw material and sulfuric acid was employed as leaching agent,the purified chromium sulphate solution was obtained after removing impurities with sulfide,precipitating iron with ox-alate and extraction,chromium oxide could be prepared with the purified chromium sulphate solution after precipitation of chromium hydroxide and calcination of chromium hydroxide.The chromium element existed with the form of Cr(Ⅲ) in the whole new process and the pollution problem caused by hexavalent chromium ion was completely resolved.The comprehensive uti-lization of resources could be realized in the new process.The iron associated with chromium in the ferrochrome alloy after leaching with sulfuric acid and removing impurities could be precipitated as ferrous oxalate with oxalate,ferrous oxalate was used as the raw material of preparation of lithium iron phosphate,the comprehensive utilization of resources and good econo-mic benefits could be achieved.The leaching rate of chromium could reach 99%,the purity of chromium oxide could be over 99% with good particle size distribution,chromium oxide could be used in the paint industry and metallurgy industry.The new process is simple and easy to realize industrialization.
Key words： chromium sulfate; ferrochrome alloy; extraction; chromium oxide; chromic salt
Jijun Liu , Hongmei Lin , Guorong Hu , Zhongdong Peng . Study on new process of producing chromium salt with ferrochrome alloy[J]. Inorganic Chemicals Industry, 2021 , 53(6) : 156 -159 . DOI: 10.19964/j.issn.1006-4990.2020-0377
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