用AC法从高锑低银类铅阳极泥中回收银和铅
来源期刊：中南大学学报(自然科学版)2003年第2期
论文作者：唐谟堂 杨声海 唐朝波 韦明芳
文章页码：132 - 135
关键词：银;铅;转化;氨浸
Key words：silver; lead; translation; leaching by ammonia
摘 要：用AC法处理高锑低银类铅阳极泥,其氯化浸出渣经转化脱氯、硅氟酸浸铅、氨水浸银和水合肼还原,得到含Ag大于95%的银粉,铅以硅氟酸铅溶液返回电解精炼.在V苏打溶液/m浸出渣=4 mL/g,n苏打实=1.6n苏打理,转化时间为4 h及温度为80℃的最佳转化条件下,铅、银、氯的平均转化率为91.42%;在V(H2SiF6)/m浸出渣=4 mL/g,浸出时间为1 h,温度为50~60℃的最佳浸铅条件下,硅氟酸浸铅率为85.74%~86.07%,硝酸浸铅率大于95%;在浸银过程中,银的浸出率约为94.0%,沉银率约为98.0%.在整个工艺中,银的直收率及总回收率分别为93.63%及98.80%,铅直收率为85.91%,总回收率98.99%.
Abstract: The chlorination-leached residue in AC process for treating lead electrolysis refining anodic slime bearing high antimony and lower silver can be translated to remove Cl, lead is leached by H2SiF6 solution and returned to the electrolysis refining process as a solution of PbSiF6, silver is leached by an ammonia solution and reduced by solution of N2H4·H2O to obtain silver powders containing Ag more than 95%. Under the optimum conditions that the ratio of liquid to solid, the use amount of soda, the reaction time and temperature is 4, 1.6 times of theoretic amount, 4 h and 80℃, the average translated ratio of lead chloride is 91.42%. When the ratio of liquid to solid is 4, the reaction time and temperature is 1 h and 50~60℃in the leaching lead process,the leached lead ratio is 85.74%~86.07% by H2SiF6 and more than 95% by HNO3. In the leaching silver process the leached ratio and precipitated ratio of silver is 94.0% and 98.0%. In the process, the comprehensive utilization of value elements is very high without environmental pollution and the metal recovery ratios are high that direct and sum ratio of silver are 93.03%and 98.80% respectively, and that of lead is 85.91% and 98.99%.
