某氰化银泥转炉冶炼高硒银烟尘综合回收研究  

Research of Comprehensive Recovery of High Selenium and Silver Fume Dust from a Silver Cyanide Mud Converter

作　　者：王卫亭 张晓军 WANG Weiting;ZHANG Xiaojun(Shandong Jinchuang Gold and Silver Smelting Co.,Ltd.)

机构地区：[1]山东金创金银冶炼有限公司

出　　处：《现代矿业》2022年第8期185-187,191,共4页Modern Mining

摘　　要：针对某氰化银泥转炉冶炼烟尘含硒、银、铅、金高的特点,为了避免火法冶炼操作环境恶劣、渣率高、金银回收率低、硒对后续工序产生不良影响,研究了稀硫酸优先分离硒、火法熔炼回收绝大部分金银、冶炼渣再氰化浸出金银的工艺。得出稀硫酸优先分离硒的最佳工艺条件:稀硫酸浓度为25%、固液质量比为1∶6、反应温度为85℃;硒浸出液还原的最佳工艺条件:亚硫酸钠用量为110 g/L、硫脲用量为10 g/L、陈化时间为12 h;硒浸出渣火法熔炼的最佳工艺条件:浸出渣、铁粉、碳酸钠、煤的质量比为50∶1∶15∶5;火法熔炼渣氰化浸出金银的最佳工艺条件:矿浆浓度为33%、氧化钙浓度为0.12%、氰化钠浓度为1.2%、氰化浸出时间为96 h;试生产采用试验确定的工艺条件,共处理金品位为150 g/t、银品位为7%、硒品位为6%的高硒银烟尘40 t,获得了金5.98 kg、金回收率为99.7%,银2.77 t、银回收率为99.1%,硒2.12 t、硒回收率为88.35%,经济效益达113.19万元,经济、环境、社会效益显著。In view of the high selenium,silver,lead and gold content in the smelting fume dust of a silver cyanide mud converter,the process of preferential separation of selenium with dilute sulfuric acid,recovery of most gold and silver by pyrometallurgical smelting,and cyanide leaching of gold and silver from smelting slag were studied in order to avoid the adverse effects of hash pyrometallurgical smelting operation environment,high slag rate,low gold and silver recovery rate,and selenium on subsequent processes.The optimum technological conditions for the preferential separation of selenium with dilute sulfuric acid are that the concentration of dilute sulfuric acid is 25%,the mass ratio of solid to liquid is 1∶6,and the reaction temperature is 85℃.The optimum technological conditions for the reduction of selenium leaching solution are that the dosage of sodium sulfite is 110 g/L,the dosage of thiourea is 10 g/L,and the aging time is 12 h.The optimum technological conditions for pyrometallurgical smelting of selenium leaching residue are that the mass ratio of leaching residue,iron powder,sodium carbonate and coal is 50∶1∶15∶5.The optimum technological conditions for cyanide leaching of gold and silver from pyrometallurgical smelting slag are that pulp concentration is 33%,calcium oxide concentration is 0.12%,sodium cyanide concentration is 1.2%,cyanide leaching time is 96 h.The try-production adopts the process conditions determined by the test.A total of 40 tons of high selenium and silver fuem dust with a gold grade of 150 g/t,a silver grade of 7%and a selenium grade of 6%were treated,gaining gold of 5.98 kg,the gold recovery rate of 99.7%,the silver of 2.77 t,the silver recovery rate of 99.1%,the selenium of 2.12 t,and the selenium recovery rate of 88.35%.The economic benefit reaches 1.1319 million yuan.The economic,environmental and social benefits are remarkable.

关 键 词：高硒高银烟尘 浸出硒 熔炼 氰化 金银 

分 类 号：X756[环境科学与工程—环境工程]