【摘要】 本文研究了生物柱浸出低品位镍矿中镍的浸出,并考察了不同粒度对浸出镍的影响。将镍矿石(平均镍含量为0.23%)破碎成>10 mm,5～10 mm,2～5 mm和<2 mm四种不同粒径的颗粒度。属水平上菌株的主要成分为硫杆菌属53.11%、钩端螺旋菌属43.52%和嗜酸菌属3.37%。浸出试验条件控制在pH 2.0和23°C。经过180 d的生物浸出实验,>10 mm(生物浸出),5～10 mm(酸浸出),5～10 mm(生物浸出),2～5 mm(生物浸出)的镍浸出率分别为23.76%,22.15%,32.42%和54.17%。分析粒度为2～5 mm的矿石,浸出前后矿石粒度发生很大变化,其中2～5 mm粒度的矿石比例降到44.64%。实验结果表明,柱式生物浸出最适合2～5 mm粒径的矿石,适当控制矿石粒度可以实现镍的高效浸出,可以为企业提供参考数据。更多还原

【Abstract】 Biological column leaching of Ni from low-grade Ni ore was studied, and the effects of ore particle size on leaching rate were investigated. The Ni ore with an average Ni content of 0.23% was crushed into four different particle size fractions: >10 mm, 5-10 mm, 2-5 mm and <2 mm. The main strain components at the genus level were acidithiobacillus(53.11%), leptospirillum(43.52%), and acidiphilium(3.37%). The leaching tests were carried out at pH 2.0 and ～23°C. The Ni leaching rates from ores with particle sizes >10 mm(bioleaching), 5–10 mm(acid leaching), 5–10 mm(bioleaching), and 2–5 mm(bioleaching) were 23.76%, 22.15%, 32.42% and 54.17%, respectively, after 180 d of bioleaching. The ore particle size changed after leaching, compared with the original ore size, the proportion of the same size of 2-5 mm ore decreased to 44.64%. Ore with particle size of 2–5 mm was most suitable for column bioleaching, and effective Ni extraction was achieved with appropriate control of ore granularity.更多还原