Bioleaching of low grade nickel sulfide mineral in column reactor

Jinchuan 低等级镍(0.4%0.6% Ni，集体部分) 硫化物矿物质矿石包含氧化镁的一个显著地高的内容(30%35% MgO，集体部分) 在主要脉石矿物质在场。Bioleaching 被执行调查可行性由于它花去要求的相对简洁， eco 友好的操作和低资本处理矿物质。混合 mesophiles 从在中国从几个酸矿收集的酸矿排水样品被充实。认为氧化镁被酸答案和过多的 Mg2+ 容易提取将超过混合 mesophiles 的忍耐，三个有效工具被用来在 bioleaching 操作期间减少氧化镁的劣势。他们是混合 mesophiles 的改编改进忍耐；预先沥滤移开很可滤取的氧化镁并且周期怀孕沥滤答案的部分流血基于混合 mesophiles 的忍耐控制 Mg2+ 的水平。镍(90.3%) 和钴(88.6%) 的抽取成功地在沥滤的 300 d 以内被完成从用在周围的温度的一个列反应堆的 Jinchuan 低等级镍硫化物矿物质矿石的过程。

Jinchuan low grade nickel （0.4%-0.6% Ni, mass fraction） sulfide mineral ore contains a remarkably high content of magnesia （30%-35% MgO, mass fraction） present in the main gangue minerals. Bioleaching was performed to investigate the feasibility to process the mineral due to its relative simplicity, eco-friendly operation and low capital cost requirements. The mixed mesophiles were enriched from acid mine drainage samples collected from several acid mines in China. Considering that the magnesia is easily extracted by acid solution and the excessive Mg^2＋ will exceed the tolerance of the mixed mesophiles, three effective means were used to reduce the disadvantage of magnesia during the bioleaching operation. They were adaptation of the mixed mesophiles to improve the tolerance; pre-leaching to remove most leachable magnesia and periodic bleeds of a portion of the pregnant leaching solution to control the level of Mg^2＋ based on the tolerance of the mixed mesophiles. An extraction of nickel （90.3%） and cobalt （88.6%） was successfully achieved within a 300 d leaching process from the Jinchuan low grade nickel sulfide mineral ore using a column reactor at ambient temperature.