酸泥湿法回收汞硒试验研究

Study on the recovery of mercury and selenium by hydrometallurgy process from acid sludge

针对锌冶炼所产制酸酸泥因含汞硒较低(Hg 2.06%,Se 6.9%),直接外售无经济效益的现状,公司采用"硫酸+氯酸钠氧化浸出-次亚磷酸还原沉汞-硫脲+亚硫酸钠还原沉硒"工艺对此酸泥进行了回收汞、硒的试验研究。结果表明在各试验工序的最佳工艺条件下,所得汞渣含汞78.37%,汞总回收率95.06%,粗硒含硒97.82%,硒总回收率90.51%。该工艺回收汞硒处理成本低,各工序仅有微量有害气体,可进行环保处理,对环境不会造成污染,若工业化应用,可取得较好经济效益。

A zinc smelting company produce acid sludge which has the low mercury and selenium content(Hg2.06%,Se 6.9%),and have no economic benefit.Aiming at this situation,the company used the process of oxidation leaching by sulfuric acid+sodium chlorate-precipitating mercury by reduction of sodium hypophosphate-precipitating selenium by reduction of thiourea+sodium sulfite to carry out the test of recover mercury and selenium from the acid sludge.The results showed that under the best process conditions of each test procedure,the obtained mercury residue contains 78.37%mercury,the total recovery rate of mercury is 95.06%,the crude selenium contains 97.82%selenium,and the total recovery rate of selenium is 90.51%.The process has low processing cost for recovering mercury and selenium,and each process has only a small amount of harmful gas,and can be treated in an environmentally friendly manner without causing pollution to the environment.If it is industrially applied,it can achieve better economic benefits.