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Pressure leaching of copper sulphide from nickel refining: Initial experiments for valorisation
Minerals Engineering ( IF 4.8 ) Pub Date : 2021-03-04 , DOI: 10.1016/j.mineng.2021.106820
Pia Sinisalo , Shila Jafari , Mari Lundström

Copper sulphide rich leach residue from nickel refining is a marketable product and may be treated by smelting. In looking for another refining technology for its valorisation, the raw material was characterised and suitability of medium-temperature sulphate-based pressure leaching was tested for this purpose. The raw material contained 58% copper carried in covellite and copper oxides. Using favourable conditions, about two hours was needed for the completion of leaching. Copper extraction increased to over 99% with increasing sulphide oxidation to sulphate (92.3–99.8%) at 165 °C, and at low final acidity (20–26 g/L). In these conditions, the extraction of residual nickel was at least 99% and acid consumption 220–230 kg/t solids. The extent of sulphate formation appeared to depend on temperature, acidity and agitation. Sulphur agglomeration and scale formation occurred at low acidity between 125 and 145 °C. Iron hydrolysis during leaching was shown to remove iron from the solution to levels acceptable for electrowinning. The noble metals appeared to remain in the residue. In addition, significant portions of the impurities were released into solution. The copper dissolved could be subjected to direct recovery and the leach residue could be sold as a by-product to a precious metals refinery.



中文翻译:

镍精炼中硫化铜的压力浸出:用于增值的初步实验

来自镍精炼的富含硫化铜的浸出残渣是一种可销售的产品,可以通过冶炼进行处理。在寻找另一种用于精炼的精炼技术时,对原材料进行了表征,并为此测试了中温硫酸盐基压力浸出的适用性。原材料包含58%的铜镍矿和氧化铜。在有利的条件下,完成浸出大约需要两个小时。在165°C和较低的最终酸度(20-26 g / L)下,随着硫化物氧化成硫酸盐(92.3–99.8%)的增加,铜的提取量增加到99%以上。在这些条件下,残留镍的提取率至少为99%,酸消耗量为220-230 kg / t固体。硫酸盐形成的程度似乎取决于温度,酸度和搅拌。硫的团聚和结垢是在125至145°C的低酸度条件下发生的。浸出过程中的铁水解表明可以从溶液中去除铁,达到电沉积可接受的水平。贵金属似乎残留在残余物中。另外,大部分杂质被释放到溶液中。溶解的铜可以直接回收,浸出的残渣可以作为副产品出售给贵金属精炼厂。

更新日期:2021-03-07
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