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 ...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℃.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.展开更多
基金Project(U1608254)supported by the Special Fund for the National Natural Science Foundation of ChinaProjects(ZJKY2017(B)KFJJ01,ZJKY2017(B)KFJJ02)supported by the Zijin Mining Group Co.,Ltd.,China。
文摘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℃.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.
