德兴铜矿HDS底泥回用的试验研究

Experimental Study on HDS Sediment Reuse in Dexing Copper Mine

与石灰乳相比,采用HDS底泥调节化学硫化技术除铁工艺p H,可以提高铜回收率和三价铁离子去除率;铜回收工艺,硫氢化钠用量少,且铜总回收率也相对较高;HDS工艺,虽然石灰乳用量偏大,但是从整个工艺来看,每升酸性水少用石灰乳5-6g,并且相同的铜上清液,添加HDS底泥比不添加要少用石灰乳1g多（约减少5%的石灰乳用量）。废水处理很少采用分段法,即用后段的底泥作为碱源调节前段的p H,降低石灰用量,来达到降低处理成本的目的。这样既减少石灰用量,又使底泥得到回用,带来了良好的经济效益。

compared with the lime, the iron removal process which used HDS sediment adjusting application could increased the copper recovery rate and trivalent iron ions removal rate;, with small amount sodium hydrosulfide was used in the copper recovery process, and the general recovery rate of copper was relatively higher; In the HDS processs, although large amount of lime was used, but based on the entire process, e less 5-6g acidic lime was used in each liter of water,and in the came copper supernatant, the lime consumption in HDS sediment added was lg less than non-HDS sediment added （around 5% reduction of lime consumption）. Segmentation method was seldom used wastewater treatment, which used end stage sediment to adjust the preceding pH, reduce the lime consumption, to achieve lower processing costs. This process could reduce the lime consumption, and the sediment could be reused, good economic benefits were achieved.