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采用生物质还原氧化锰矿得到一氧化锰替代碳酸锰作为电解锰原料,通过调整电解锰的生产工艺,将浸出液的Ni,Co完全沉淀,使其得到有效富集。首先研究了硫酸量、浸出温度和浸出时间等酸浸条件对还原得到的一氧化锰中Ni,Co浸出率的影响。然后以二氧化锰为氧化剂,研究了中和剂的种类和酸碱度对沉铁的影响。并且确定了沉淀剂福美钠的使用量和沉淀pH对富集Ni,Co的影响。研究表明,最佳浸出条件是液固比为5.5∶1,浸出温度为90℃,浸出时间为30 min,镍钴的浸出率分别为94.45%,98.56%。以(NH4)2CO3代替氨水作为中和剂,可以减少铁渣吸附镍钴离子,增加镍钴回收率。沉淀最佳pH为4.2～5.0,镍钴的损失率为10%以下。沉淀最佳条件为SDD与钴镍最佳摩尔比为4∶1,pH为5.0。改进后的镍钴的总回收率分别为80%和83%,富集物中镍和钴的品味为12.13%,3.23%。
Manganese oxide ore is used to replace manganese carbonate as raw material for electrolytic manganese by biomass reduction of manganese oxide ore. By adjusting the production process of electrolytic manganese, nickel and cobalt in the leaching solution are completely precipitated to be effectively enriched. The effects of acid leaching conditions such as sulfuric acid amount, leaching temperature and leaching time on the leaching rates of Ni and Co in the reduced manganese oxide were studied. Then manganese dioxide was used as oxidant to study the influence of neutralizer’s type and pH on the deposition of iron. The influence of the amount of precipitating agent sodium thiocyanate and the pH of precipitation on the enrichment of Ni and Co was also determined. The results show that the optimal leaching conditions are liquid - solid ratio 5.5:1, leaching temperature 90 ℃, leaching time 30 min. The leaching rates of nickel and cobalt are 94.45% and 98.56% respectively. To (NH4) 2CO3 instead of ammonia as a neutralizer, can reduce the iron slag adsorption of nickel and cobalt ions, increase nickel and cobalt recovery. The optimum pH of precipitation is 4.2 ~ 5.0, the loss rate of nickel and cobalt is 10% or less. The optimum conditions for the precipitation of SDD and cobalt nickel optimal molar ratio of 4: 1, pH 5.0. The improved total recoveries of nickel and cobalt are 80% and 83%, respectively, and the contents of nickel and cobalt in the enriched product are 12.13% and 3.23% respectively.