摘要
运用HSC Chemistry 9.0热力学软件对铜电解黑酸硫化脱砷反应进行热力学分析,发现H_(2)S可以实现对高浓度硫酸体系中亚砷酸和砷酸的硫化沉淀。根据理论分析结果进行黑酸硫化脱砷试验,考察了硫化剂用量、反应时间对硫化沉砷效果的影响。结果表明,在室温下,H_(2)S用量为理论量的0.87倍、反应时间30 min条件下,经硫化沉淀后的黑酸含砷量从6777.52 mg/L降至10.68 mg/L,黑酸中砷、铜、锑去除率分别为99.84%、99.76%、99.33%,铁镍几乎不沉淀,脱砷渣中砷和硫质量分数分别为43.21%和44.68%,其中硫化砷形态的硫质量分数为42.33%,硫化砷S/As物质的量比为2.29,产物为As_(2)S_(3)和As_(2)S_(5)等的混合物。热力学分析与试验结果略有出入,但其对试验和实践仍具有一定的指导作用。
Thermodynamic analysis was conducted with HSC Chemistry 9.0 software for removing arsenic by sulfuration from waste acidic solution left after copper electrolysis,and it is found that H_(2)S could effectively make asenous acid and arsenate in the high-concentrated sulfuric acid system precipitated by sulfuration.Based on the theoretical analysis results,an experiment on arsenic removal of waste acidic solution by sulfuration was carried out to investigate the effects of sulfurizing agent dosage and reaction time on the arsenic precipitation effect by sufuration.Results show that by 30 min-sulfuration with an addition of H_(2)S at 0.87 times the theoretical amount,the arsenic content in waste acidic solution after precipitation process falls down to 10.68 mg/L from 6777.52 mg/L,and the removal rates of arsenic,copper and antimony are 99.84%,99.76%and 99.33%,respectively.The iron and nickel therein are hardly precipitated,and the mass fraction of arsenic and sulfur in the residue of the arsenic removal process are 43.21%and 44.68%,among which the arsenic in the form of arsenic sulfide is in a mass fraction of 42.33%,and S/As in the arsenic sulfide is in a ratio of 2.29.The finally obtained product is a mixture of As_(2)S_(3) and As_(2)S_(5).It is shown that the thermodynamic analysis results differ slightly from the experimental results,but are still of guiding reference for experiments and practice.
作者
周兆安
李俊
刘小文
毛谙章
周爱青
ZHOU Zhao′an;LI Jun;LIU Xiaowen;MAO Anzhang;ZHOU Aiqing(Guangdong Feinan Resources Recycling Co.,Ltd.,Zhaoqing 526233,Guangdong,China;Guangdong Engineering Technology Research Center for Comprehensive Utilization of Copper-Containing Industrial Sludge,Zhaoqing 526233,Guangdong,China)
出处
《矿冶工程》
CAS
北大核心
2024年第5期137-141,共5页
Mining and Metallurgical Engineering
关键词
铜电解
黑酸
硫化沉淀
砷
热力学
脱砷
硫化砷
copper electrolysis
waste acidic solution
precipitation by sulfuration
arsenic
thermodynamics
arsenic removal
arsenic sulfide
