![]() ![]() ![]() 2017b), and hydrometallurgical methods such as pressure oxidative leaching coupled with oxygen, ozone, permanganate and ferrate have been developed ( Zhang et al. Conventionally, sodium roasting-water leaching technology, calcium roasting-acid leaching ( Xue et al. Many hydrometallurgical processes have been proposed to recover chromium ( Shiyuan et al. Oxidation efficiency was nearly 100% under the optimal conditions: volume ratio of H 2O 2 to mass of Cr 2(SO 4) 3 of 2.4 mL/g, mass ratio of NaOH to Cr 2(SO 4) 3 0.6 g/g, reaction time of 90 min, reaction temperature of 90 ☌ and stirring rate of 500 rpm. The oxidation efficiency was significantly affected by the dosage of H 2O 2 and NaOH, reaction time and reaction temperature took second place last was the stirring rate. ![]() The effect of parameters including dosage of H 2O 2, dosage of NaOH, reaction time, reaction temperature and stirring rate on the oxidation efficiency of chromium were investigated. This paper focuses on the oxidation process of chromium (III) with hydrogen peroxide (H 2O 2) in an alkaline medium. Many technologies have been proposed to oxidize chromium, such as roasting-water leaching technology and hydrometallurgical methods such as pressure oxidative leaching coupled with oxygen, ozone, permanganate and ferrate, but the problems associated with the high temperature, low overall resource utilization efficiency, high energy consumption, and the environmental pollution, still remain unsolved. ![]()
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