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用乙基黄原酸钾(或钠)(即乙基黄药)为捕收剂的离子浮选法,可从溶剂萃取铀后的酸性含镍锌的萃余液中高效、优先浮选分离镍。加药量为理论量的1.05～1.20倍,在浮选槽中进行离子浮选,溶液pH在4.0～5.2时,镍以疏水性的黄原酸镍形式从溶液中浮选出来。镍的提取率大于99.6％,镍锌分离因数高达4.3×10~4。采用聚(4-乙烯苄基)三甲基氯化铵(加入量为11.4克/米~3溶液)和淀粉(加入量5.0克/米~3溶液)作絮凝剂,使黄原酸镍完全沉淀的时间缩短了几十倍。用氢氧化钠溶液处理黄原酸镍,可转化成氢氧化镍,经过滤、洗涤、干燥,所得最终产品含镍40％;转化后的母液含有乙基黄药,可返回使用,总返回率约为80％。利用含碳酸盐的碱性废液中和浮选镍以后的溶液,以沉淀锌,最终得到含锌50％以上的碱式碳酸锌产物。 用黄药作捕收剂的离子浮选法的这些成果,在一定程度上也适用于一些重金属和贵金属的分离和回收上,也可用于低含量重金属的废水处理方面。
Ion flotation with potassium ethylxanthate (or sodium) (ie, ethylxanthate) as collector can be efficiently and preferentially flotation separated from the acidic nickel-zinc-containing raffinate after uranium extraction nickel. The dosing amount is 1.05-1.20 times the theoretical amount, and ion flotation is carried out in the flotation tank. When the pH of the solution is between 4.0 and 5.2, the nickel flotates from the solution in the form of hydrophobic nickel xanthate. Nickel extraction rate of more than 99.6%, nickel-zinc separation factor as high as 4.3 × 10 ~ 4. Poly (4-vinylbenzyl) trimethylammonium chloride (11.4 g / m ~ 3) and starch (5.0 g / m ~ 3) were added as flocculant to make the xanthate completely Precipitation time reduced by a few times. The treatment of sodium xanthate with sodium hydroxide solution can be transformed into nickel hydroxide, which is filtered, washed and dried, and the final product obtained contains 40% nickel; the transformed mother liquor contains ethyl xanthate and can be returned for use. The total return rate About 80%. Neutralizing the solution after the flotation of nickel with a carbonate-containing alkaline waste liquid to precipitate zinc to finally obtain a basic zinc carbonate product containing more than 50% of zinc. These results of the ionic flotation method using the xanthate as a collector can also be applied to the separation and recovery of some heavy metals and precious metals to a certain extent, and also can be used for the treatment of waste water with a low content of heavy metals.