Peng Hao, Guo Jing, Li Gang, Cheng Qinzhe, Zhou Yuju, Liu Zuohua, Tao Changyuan
College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing 408102, China E-mail:
College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030, China.
Water Sci Technol. 2019 Jan;79(2):366-374. doi: 10.2166/wst.2019.056.
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 (HO) in an alkaline medium. The effect of parameters including dosage of HO, 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 HO 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 HO to mass of Cr(SO) of 2.4 mL/g, mass ratio of NaOH to Cr(SO) 0.6 g/g, reaction time of 90 min, reaction temperature of 90 °C and stirring rate of 500 rpm.
已经提出了许多氧化铬的技术，如焙烧-水浸出技术以及湿法冶金方法，如氧气、臭氧、高锰酸盐和高铁酸盐的加压氧化浸出，但与高温、整体资源利用效率低、高能耗以及环境污染相关的问题仍然没有得到解决。本文重点研究了在碱性介质中用过氧化氢（HO）氧化铬（III）的过程。研究了HO用量、NaOH用量、反应时间、反应温度和搅拌速率等参数对铬氧化效率的影响。HO和NaOH的用量对氧化效率有显著影响，反应时间和反应温度次之；搅拌速率影响最小。在最佳条件下，氧化效率接近100%：HO与Cr(SO)质量的体积比为2.4 mL/g，NaOH与Cr(SO)的质量比为0.6 g/g，反应时间为90分钟，反应温度为90℃，搅拌速率为500转/分钟。
