青海某石棉尾矿综合利用中试研究

Pilot study on comprehensive utilization of an asbestos tailings in Qinghai Province

以青海省某石棉尾矿为原料,采用酸浸、中和、结晶、氧化除铁、硫化沉镍以及纯碱沉淀碳酸镁、酸浸渣碱溶提硅等工序分离提取石棉尾矿中的镁、硅、铁、镍,形成系列产品,有利于环境保护和发展循环经济。中试产品主要回收率:SiO2 94.81%,NiO 82.09%,MgO≥95%,Fe≥90%。平均产出率(以加工1 000kg尾矿计):七水硫酸镁730kg,碱式碳酸镁224kg,高分散性白炭黑299kg,氧化铁红65.7kg以及镍精矿9.44kg。每处理1 000kg石棉尾矿获得利润1 000元以上。

Taking an asbestos tailings in Qinghai Province as raw material,magnesium,silicon,iron and nickel in asbestos tailings are separated and extracted by acid leaching,neutralization,crystallization,iron removal by oxidation,nickel sulfide precipitation,magnesium carbonate precipitation by soda,and silicon extraction by alkali dissolution of acid leaching residue,and then formed a series of products.The process is conducive to environmental protection and the development of circular economy.Main recovery rates of pilot products are:SiO2 94.81%,NiO 82.09%,MgO≥95%,Fe≥90%.Average output rates(processing 1000 kg tailings meter)are:magnesium sulfate heptahydrate 730 kg,basic magnesium carbonate 224 kg,high dispersion silica for tires 299 kg,iron oxide red 65.7 kg and nickel concentrate9.44 kg.The profit for each 1000 kg of asbestos tailings is more than 1000 yuan.