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我国某湿法炼銅試驗厂采用的原料系含鈷0.2～0.24%的低品位硫化銅精矿。該厂从电解废液中回收銅后,用苏打中和获得碳酸鈷。碳酸鈷中主要合有鎳、錳、鋅、銅和铁等杂质,須加工成商品氧化鈷。經过試驗室試驗,我們认为用亚硝酸鈷鉀法从含有較大量的鎳、錳等杂质的原料中提取氧化鈷,比通常采用的次氯酸鈉法,具有生产工艺流程和設备簡单,过程容易控制,鈷的直接回收率高,产品质量高等一系列的优点,同时也是一种比較經济的方法。茲将生产試驗的工艺流程,操作技术条件和生产試驗的結果分別叙述如下。
A hydrometallurgical pilot plant in China uses 0.2% -0.24% low-grade copper sulphide concentrate containing cobalt. After the plant recovered copper from the electrolytic waste, it was neutralized with soda to obtain cobalt carbonate. Cobalt carbonate in the main with nickel, manganese, zinc, copper and iron and other impurities, to be processed into commercial cobalt oxide. After laboratory tests, we believe that the use of cobaltous acid nitrite from a larger amount of nickel, manganese and other impurities in raw materials extracted cobalt oxide than the commonly used method of sodium hypochlorite, with the production process and equipment is simple, the process easy Control, direct cobalt recovery rate, high product quality, a series of advantages, but also a more economical method. The production process of the test process, operating conditions and production test results are described below.