摘要
针对浮选获得的硫化镍精矿,采用常压氯化物-氧气强化硫酸浸出工艺进行处理,研究镍、铜和铁的浸出行为,考察原矿粒度、硫酸用量、浸出温度、通氧量、氯离子浓度、反应时间和液固比等因素的影响,确定硫化镍精矿常压酸浸的最佳工艺条件.结果表明,最佳工艺条件下,原矿粒度小于 20 μm的颗粒占比为81.05%,硫酸用量为500 kg/t矿,浸出温度为95℃,通氧量为300 mL/(L·min),氯离子浓度为30 g/L,浸出时间为 10 h,液固比为 5,镍、铜和铁的浸出率分别为 95.79%、93.59%和 19.04%.
Abstract
For the sulfide nickel concentrate obtained by flotation,the atmospheric pressure chloride-oxygen enhanced sulfuric acid leaching process is adopted for treatment,and the leaching behavior of nickel,copper,and iron is studied,and the effects of factors such as raw ore particle size,sulfuric acid dosage,leaching temperature,oxygen flow rate,chloride ion concentration,reaction time,and liquid-solid ratio are examined to determine the optimal process conditions for atmospheric pressure acid leaching of sulfide nickel concentrate.The results show that under the optimal process conditions,the proportion of particles with original ore particle size less than 20 μm is 81.05%,the amount of sulfuric acid used is 500 kg/t of ore,the leaching temperature is 95℃,the oxygen flow rate is 300 mL/(L·min),the chloride ion concentration is 30 g/L,the leaching time is 10 h,the liquid-solid ratio is 5,and the leaching rates of nickel,copper,and iron are 95.79%,93.59%,and 19.04%,respectively.
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