摘要
以热酸直接浸出黄钾铁矾渣的浸出液为原料,采用单因素法对浸出液还原、硫化沉淀除隔和氟化沉淀除钙除镁的工艺进行研究.浸出液还原实验结果表明：在反应温度80℃,时间2 h,搅拌速度150-200 r/min,铁粉加入量为理论量1.15倍的条件下,浸出液中Fe^3＋全部被还原,铁锌比接近低功耗锰锌铁氧体的理论配方,杂质Cu^2＋的质量浓度降到1 mg/L,去除率在99%以上,Cd^2＋的去除率为17%.硫化沉淀除隔实验结果表明：浸出液还原反应完成后,直接在其中加入理论量1.4倍的（NH4）2S,反应时间为30 min,溶液中杂质Cd2＋的质量浓度降到1 mg/L以下,去除率在98%以上.氟化沉淀除钙除镁综合实验研究中,溶液中Mg^2＋、Ca^2＋的除去率分别为96.73%和76.67%.
Taking the leaching solution for direct hot acid leaching of jarosite residues as the raw material,the processing of reduction of leaching solution,the removal of Cd^2＋,Ca^2＋ and Mg^2＋ with sulfidation precipitation and fluorination precipitation was studied respectively by using single factor method.The experimental result demonstrated that the optimun processing condition of leaching solution reduction was as follows： reactive temperature—80 ℃,time—2.0 h,stirring speed—150～200 r/min,the addition amount of iron powder was 1.15 times as theoretical quantity.Under these conditions,the Fe^3＋ was completely restored,the ratio of iron to zinc was close to the data from theoretical formula for low-power Mn-Zn ferrite,the average removal rates of Cu^2＋ and Cd^2＋ were 99% and 17%,respectively.Cu^2＋ concentration of impurities in the leaching solution was lowered to 1 mg/L.The experimental result demonstrated that the optimum conditions of sulfidation precipitation process were as follows： addtion of（NH4）2S was 1.4 times of theoretical amount after reduction reaction into the leaching solution directly and the precipitation time—30 min.Under these conditions,the average removal rates of Cd2＋ is more than 98%.The comprehensive experimental results of fluorination precipitation demonstrate： the average removal rates of Mg^2＋ and Ca^2＋ were 96.73% and 76.67%,respectively.
出处
《兰州理工大学学报》
CAS
北大核心
2010年第3期25-30,共6页
Journal of Lanzhou University of Technology
基金
教育部大学生创新性实验计划项目(081073105)
关键词
黄钾铁矾渣
还原
硫化沉淀
氟化沉淀
jarosite residues
reduction
sulfidation precipitation
fluorination precipitation
