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为了使铜、镍、钻硫酸盐化,然后用水浸出可溶性的硫酸盐,对含Cu 4.03％、Ni1.98％、Co0.48％的铜转炉渣进行了加硫酸铵常压焙烧,并对焙烧温度(200—600℃)、时间(15—120min)和硫酸铵用量(0.5—2.5倍理论计算量)等参数的影响作了研究。在常压下,加2.5倍理论计算量的硫酸铵得到铜、镍、钻的回收率分别为85％、81％和85％。用硫酸进行同样的研究。对硫酸用量(0.25—2倍理论计算量)、焙烧温度(100—300℃)和时间(15—120min)等试验变数的影响也作了研究。在最佳条件下,即焙烧温度150℃,焙烧时间60min,加入理论计算量的硫酸得到铜、镍、钻的回收率分别为95％、90％和99％,杂质铁有60—80％进入溶液中。用氨水及石灰作沉淀剂能有效地从浸出液中除去大部分铁。加硫酸两段焙烧(第一段温度为150℃,第二段温度为650℃)可使硫酸盐产物中铁的含量降到3％左右,而铜、镍、钻的回收率几乎不受影响。
In order to make copper and nickel sulfate and then leached with soluble sulfate, the copper converter slag with Cu 4.03%, Ni 1.98% and Co 0.48% was subjected to atmospheric pressure baking with ammonium sulfate and calcined Temperature (200-600 ℃), time (15-120min) and the amount of ammonium sulfate (0.5-2.5 times the theoretical calculation) and other parameters were studied. At atmospheric pressure, 2.5 times the theoretical amount of ammonium sulfate was added to obtain copper, nickel, and diamond recovery of 85%, 81%, and 85%, respectively. The same study was done with sulfuric acid. The effects of experimental variables such as the amount of sulfuric acid (0.25-2 times the theoretical calculation), the calcination temperature (100-300 ° C) and the time (15-120 minutes) were also investigated. Under optimum conditions, the calcination temperature was 150 ℃ and the calcination time was 60min. The recoveries of copper and nickel were 95%, 90% and 99% respectively, and 60-80% of the impurities were added into the theoretical amount of sulfuric acid Solution. Ammonia and lime as a precipitating agent can effectively remove most of the iron from the leachate. Adding two stages of sulfuric acid roasting (the first temperature is 150 ℃, the second temperature is 650 ℃) can reduce the content of iron in the sulfate product to about 3%, while the recoveries of copper, nickel and diamond are almost unaffected.