镍电解铁渣中贵金属回收研究及工业化应用

Study on Application of copper electrolysis black copper slag treatment process

某硫化镍电解阳极液中含有少量贵金属，这部分贵金属在净化除铁时绝大部分进入一次铁渣，最终随铁钒渣外排。对此，本文利用贵金属离子的不稳定性及容易硫化沉淀的特性，加强一次铁渣酸溶，之后，在一次铁渣酸溶后液中加入沉淀剂沉淀贵金属离子，过滤后，滤渣为回收的贵金属渣；滤液再采用黄钠铁矾法除铁，外排的铁矾渣渣中的PI、Pd、Au含量由原来的10-20g/t降至1g／t左右，分散于阳极液中90％以上的Pt、Pd、Au得到回收。本研究的应用，避免了贵金属的分散损失，工艺简单，现场容易实施，对生产不带来影响，为铁矾渣的直接开路创造了条件。

Some sulfide nickel anodic electrolyte contains a small amount of precious metal. This partof the precious metals en- ters into iron slag in the Fe removal, and eventually discharged with iron slag. The precious metal ion has the characteristics of instabil- ity and easy to sulfide precipitation. In thispaper, the first stage iron slag was strengthened to acid dissolution. Precipitation was added into the acid solution and precious metal iron was precipitated. Filtrate and residue with precious metal was gotafter filtered. The filtrate was removed iron by jarosite method. Pt,Pd,Au content of discharged jarosite slag is reduced from 10 - 20g/t to lg/t. The recovery rate of Pt,Pd,Au contained in anodic electrolyte is up to 90%. Application of this research, precious metal loss was avoid and creating conditions for jarosite open-circuit treatment. This process has the advantages of simple process, easy implementation at production site and do not affect production.