含铜镍工业污泥性质及矿化工艺研究

Study on Properties and Mineralization Process of Cu-Ni Bearing Industry Sludge

某重金属工业污泥主要由磷酸氢钙、石膏和非晶态的氢氧化物、硅胶体等物质组成。铜、镍等重金属分散于各物相中,以磷酸氢钙为主体的混合物是有价金属铜、镍的主要载体,难以通过物理方法提取回收。污泥矿化试验结果表明,在烟煤用量15%、硫酸钠用量20%、石英用量20%、硼砂用量2%、烧结温度1 150℃、烧结时间60min的条件下,浮选烧结料可获得铜、镍品位分别为6.96%、6.15%的精矿,铜、镍回收率分别为87.63%和88.64%,尾矿铜、镍品位分别降低至0.54%、0.44%。

A heavy metal industrial sludge is mainly composed of calcium hydrophosphate,gypsum and amorphous hydroxide,and silica gel.Copper and nickel are dispersed in various physical phases,and the mixture with calcium hydrogen phosphate as main body is the main carrier of valuable metals of nickel and copper,which are difficult to be extracted and recycled by physical methods.Mineralization test results show that concentrate with Cu and Ni contents of 6.96% and 6.15% can be obtained after flotation of sintering material under the conditions including bituminous dosage of 15%,sodium sulfate dosage of20%,quartz dosage of 20%,borax dosage of 2%,sintering temperature of 1 150℃,and sintering time of60 min.Recovery of copper and nickel in concentrate is 87.63%and 88.64%respectively,and Cu and Ni grades in tailing can be reduced to 0.54%and 0.44%respectively.