电镀污泥硫化烧结物的浮选行为及机理研究

Study on Flotation Behavior and Mechanism of Sulphide Sinter in Electroplating Sludge

采用“硫化烧结-浮选”工艺综合回收电镀污泥中铜和镍,通过浮选试验和分析测试手段研究电镀污泥硫化烧结物的浮选行为和机理。浮选试验结果表明,结晶度低、纯度较高的铜镍硫化物的可浮性较差,且其浮选行为与天然硫化矿存在一定差异,主要表现在捕收剂用量和矿浆pH。分析测试结果表明,常规巯基类捕收剂可化学吸附在铜镍硫化物表面,但是吸附强度低、吸附率低导致以上浮选行为差异。污泥烧结物浮选试验表明,在较高的丁基黄药和丁铵黑药用量和苛刻的矿浆pH条件下,铜镍的综合回收率分别为83.13%、71.29%和83.04%、73.99%,实现污泥烧结物中铜镍的综合回收。

The process of sulfidation sintering and flotation has been used to recover copper and nickel from electroplating sludge comprehensively, and the flotation behavior and mechanism of sulphide sinter of electroplating sludge were studied through flotation tests and analytical methods.The flotation results indicated that copper-nickel sulfide with low crystallinity and high purity had poor floatability, and its flotation behavior was somewhat different from that of natural sulfide ores, which was mainly manifested in the concentration of collectors and the pH of the slurry.Analysis and test results showed that conventional sulfhydryl collectors could be chemically adsorbed on the surface of copper-nickel sulfide, but the poor adsorption strength and low adsorption rate could lead to the above flotation behavior.Flotation test results of sludge sinter showed that, under the condition of higher concentration of butyl xanthate and ammonium dibutyl dithiophosphate and harsh pH of pulp, the comprehensive recovery of copper and nickel is 83.13% and 71.29%,83.04% and 73.99%,respectively, realizing the comprehensive recovery of copper and nickel from sludge sinter.