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铁渣是在硫酸镍净化过程中和除铁时形成的。它的主要成份是Fe(OH)_3、Ni(OH)_2,NiSO_4、CaSO_4、Cu(OH)_2和少量Fe(OH)_2等,我厂铁渣中镍含量为～8%。为了回收上述渣中的镍,采用氨浸法,本法是用含NH_4HCO_3的氨溶液,在常温常压下直接浸出,Ni(OH)_2、Cu(OH)_2与氨水作用形成Ni(NH_3)~(++)_6、Cu(NH_3)~(++)_4络离子,而Fe(OH)_3、Fe(OH)_2则不溶于氨水,利用这个性质,可使镍铜与大量的氢氧化铁分离,达到回收镍的目的,本试验采用～8%样品。
Iron slag is formed during nickel sulfate purification and iron removal. Its main components are Fe (OH) _3, Ni (OH) _2, NiSO_4, CaSO_4, Cu (OH) _2 and a small amount of Fe (OH) _2. In order to recover the nickel in the slag, the ammonia leaching method is adopted. In the method, NH (NH 3) 3 is directly leached out by ammonia solution containing NH_4HCO_3 at normal temperature and pressure, Ni (NH_3) ~ (++) _6, Cu (NH_3) ~ (++) _4, while Fe (OH) _3 and Fe (OH) _2 are insoluble in ammonia water. Iron separation, to achieve the purpose of nickel recovery, the test used ~ 8% of the sample.