CAJ | 학술논문

采用硫酸浸出锌冶炼含镉烟尘，得到含镉硫酸浸出液，在硫酸镉浸出液中加入双氧水和 FeCl3溶液，用NaOH溶液调节pH值后过滤，将滤液加入NaOH溶液中得到Cd(OH)2粉体，采用氢气还原得到镉粉。结果表明：当硫酸浓度为110 g/L、反应温度为65℃时，镉浸出率达99.63%。双氧水用量为理论量10倍、n(Fe)/n(As)为3：1、pH=5.5时，砷的去除率达99.5%，得到净化的硫酸镉溶液。将硫酸镉溶液以缓慢加料方式加入浓度为2 mol/L的NaOH溶液中，反应温度为25℃，控制终点pH=10，过滤洗涤得到粒径为10~20μm的Cd(OH)2粉体，采用氢气还原Cd(OH)2粉体，在反应温度为310℃、反应时间120 min、氢气流量40 L/h时，得到平均粒径为49.61μm的球形镉粉。
채용류산침출자야련함력연진，득도함력류산침출액，재류산력침출액중가입쌍양수화 FeCl3용액，용NaOH용액조절pH치후과려，장려액가입NaOH용액중득도Cd(OH)2분체，채용경기환원득도력분。결과표명：당류산농도위110 g/L、반응온도위65℃시，력침출솔체99.63%。쌍양수용량위이론량10배、n(Fe)/n(As)위3：1、pH=5.5시，신적거제솔체99.5%，득도정화적류산력용액。장류산력용액이완만가료방식가입농도위2 mol/L적NaOH용액중，반응온도위25℃，공제종점pH=10，과려세조득도립경위10~20μm적Cd(OH)2분체，채용경기환원Cd(OH)2분체，재반응온도위310℃、반응시간120 min、경기류량40 L/h시，득도평균립경위49.61μm적구형력분。
The CdSO4 solution was prepared by leaching roasting dust of zinc smelting with sulfuric acid, then, the CdSO4 solution was purified by adding hydrogen peroxide and ferric chloride and adjusting pH with sodium hydroxide. Cd(OH)2 powder was prepared after the purified CdSO4 solution mixed with NaOH solution, then, reduced with hydrogen. The results show that the leaching rate of Cd reaches 99.63% under the condition of H2SO4 concentration of 110 g/L, reaction temperature of 65℃. Under the condition thatn(Fe)/n(As) is 3:1 and pH is 5.5, the removal rate of As can be higher than 99.5%. The obtained Cd(OH)2 particle size is 10-20 μm when the reaction temperatureis 25℃, pH value of the solution is 10. High purified Cd powders were prepared from Cd(OH)2 particles reduced by hydrogen. The optimum process conditions are as follows: reaction temperature is 310℃, reaction time is 120 min and hydrogen flow is 40L/h. The average particles size of spherical Cd powder is about 49.61 μm.