Highly efficient oxidation of chromium (III) with hydrogen peroxide in alkaline medium

Author:

Peng Hao1,Guo Jing1,Li Gang1,Cheng Qinzhe1,Zhou Yuju1,Liu Zuohua2,Tao Changyuan2

Affiliation:

1. College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing 408102, China

2. College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030, China

Abstract

Abstract 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. This paper focuses on the oxidation process of chromium (III) with hydrogen peroxide (H2O2) in an alkaline medium. The effect of parameters including dosage of H2O2, dosage of NaOH, reaction time, reaction temperature and stirring rate on the oxidation efficiency of chromium were investigated. The oxidation efficiency was significantly affected by the dosage of H2O2 and NaOH, reaction time and reaction temperature took second place; last was the stirring rate. Oxidation efficiency was nearly 100% under the optimal conditions: volume ratio of H2O2 to mass of Cr2(SO4)3 of 2.4 mL/g, mass ratio of NaOH to Cr2(SO4)3 0.6 g/g, reaction time of 90 min, reaction temperature of 90 °C and stirring rate of 500 rpm.

Funder

Chongqing Science and Technology Commission

Talent Introduction Project of Yangtze Normal University

National Natural Science Foundation of China

Publisher

IWA Publishing

Subject

Water Science and Technology,Environmental Engineering

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