摘要
三氧化二砷为有毒有害物质,且存储及运输风险非常大。本文介绍了一种采用三氧化二砷制备单质砷的湿法工艺,以实现三氧化二砷减量化和无害化进行存储和运输的需求。该工艺以三氧化二砷为原料,采用还原剂R通过还原制备单质砷,工艺中的还原剂R为铝粉、镉粉中的一种或这两种金属粉任意比例的混合物。试验结果表明,在还原温度60℃、还原时间5 h、硫酸浓度7.5%、还原剂用量1.8倍的较佳工艺条件下,砷的还原率大于99%,粗砷的品位大于97%;粗砷经精制可得到品位99%以上的单质砷。该工艺流程简单、回收率高、成本低廉、环境友好,实现了三氧化二砷减量化和无害化处置的需求,为有色冶炼行业含砷固废的工业化处理开辟了一条新途径。
Arsenic trioxide is a toxic and harmful substance, and the storage and transportation risks are very high. This paper introduces a hydrometallurgical process for preparing elemental arsenic by using arsenic trioxide, so as to meet the needs of minimization of arsenic trioxide as well as harmless storage and transportation of arsenic trioxide. With arsenic trioxide as a raw material, this process uses R as reducing agent to prepare elemental arsenic through reduction. The reducing agent R in the process can be aluminum powder, cadmium powder or a mixture of these two metal powders in any proportion. The test results show that the reduction rate of arsenic is greater than 99% and the grade of crude arsenic is greater than 97% under the optimum process conditions of reduction temperature being 60 ℃, reduction time being 5 h, initial acidity being 7.5%, and dosage of reducing agent being 1.8 times. Elemental arsenic with a grade of more than 99% can be obtained by crude arsenic refining. This process has the advantages of simple process, high recovery rate, low cost and environmental friendliness. It meets the requirements of arsenic trioxide minimization and harmless disposal, and opens up a new way for the commercial application of arsenic solid waste in non-ferrous smelting industry.
作者
田静
李晓恒
张文岐
彭国敏
崔育涛
孙婷婷
张娜
TIAN Jing;LI Xiao-heng;ZHANG Wen-qi;PENG Guo-min;CUI Yu-tao;SUN Ting-ting;ZHANG Na(Key Laboratory of Comprehensive Utilization of Gold Resources of Henan Province,Sanmenxia 472000,China;Henan Zhongyuan Gold Smelter Co.,Ltd.,Sanmenxia 472000,China)
出处
《中国有色冶金》
CAS
北大核心
2022年第4期52-56,共5页
China Nonferrous Metallurgy
基金
2021年河南省重大科技专项(201111311000)。
关键词
含砷固废
三氧化二砷
还原剂R
单质砷
全湿法工艺
砷回收率
制备成本
生产环境
arsenic-containing solid waste
arsenic trioxide
reducing agent R
elemental arsenic
hydro-metallurgical process
arsenic recovery rate
preparation cost
production environment
