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对一次和二次铜熔渣进行了硫酸盐化焙烧,以促使铜、镍、钴、锌和铁的溶解。整个过程包括粉渣预焙烧、加黄铁矿焙烧和水浸。还研究了焙烧和浸出条件对有用金属回收率的影响。对硫化物一次渣直接进行焙烧,尽管能使大量铜被溶解,但加黄铁矿焙烧后可提高其回收率。这种方法也可用来从二次熔渣中回收铜。在55℃、黄铁矿/熔渣比为0.25的最佳条件下,将黄铁矿和预焙烧过的熔渣一起焙烧1h,可回收95％以上的铜,并能回收一定量的钴、镍和锌.熔渣中2％左右的铁进入浸出液。提高焙烧温度虽可减少铁杂质,但铜回收率也同时降低.为了减少浸出液中的铁杂质.采用充气法看来是一种较合适的途径。
The primary and secondary copper slag were sulfated to promote the dissolution of copper, nickel, cobalt, zinc and iron. The whole process includes powder pre-baking, pyrite roasting and flooding. The effect of roasting and leaching conditions on the recovery of useful metals was also studied. Sulfide once the slag directly roasting, although a large number of copper can be dissolved, but pyrite roasting can increase its recovery. This method can also be used to recover copper from secondary slag. Under the optimal conditions of 55 ℃ and pyrite / slag ratio of 0.25, pyrite and pre-calcined slag were calcined for 1h, copper above 95% could be recovered and a certain amount of cobalt could be recovered. Nickel and zinc 2% of the iron in the slag enters the leachate. Although increasing the calcination temperature can reduce the iron impurities, but the recovery rate of copper is also reduced.In order to reduce the iron impurities in the leaching solution, the use of aeration method seems to be a more appropriate way.