摘要
为提取广西某高硫砷难浸金精矿中的金,利用氧化亚铁硫杆菌,通过鼓泡搅拌槽浸试验对该金精矿进行细菌氧化预处理,浸出铁和砷,分解黄铁矿和砷黄铁矿,使金得以暴露以便氰化浸出。研究了pH、细菌接种量、矿浆浓度、通气量以及矿石粒度等因素对细菌氧化预处理过程的影响,结果表明:细菌氧化预处理该高硫砷难浸金精矿的适宜条件为pH=2.0、接种量10%(体积分数)、矿浆质量浓度100 kg/m3、通气量0.1 L/(L.min),在此条件下,细菌作用10 d后,Fe和As的浸出率分别可达到50%和90%以上;矿石的粒度越小越有利于细菌预处理;细菌预处理过程中砷酸铁沉淀的生成对铁和砷的浸出均不利,有待采取措施。
To extract the gold from a high arsenic high sulfur refractory gold concentrate of Guangxi, the gold concentrate was pretreated by hio-oxidation using Thiobacillusferrooxidans in a foaming agitation cell test to decompose the pyrite and arsenopyrite so as to expose the gold for cyanide leaching. The effect of pH, inoculation concentration, pulp density, aeration amount and ore particle size on the hio-oxidation pretreatment process was studied. The results show that the appropilate conditions for the hio-oxidation pretreatment of this gold concentrate are： pH value of 2.0 ; inoculation concentration of 10% ; pulp density of 100 kg/m3 ; and aeration amount of 0.1 L/（ L · min）. Under such conditions, the Fe and As leaching rates could be over 50% and 90% respectively after 10 d bio-oxidation. The smaller ore particle size is more beneficial to such pretreatment and the formation of the precipitation of ferric arsenate is unfavorable to the iron and arsenic leaching, which remains to be solved.
出处
《金属矿山》
CAS
北大核心
2007年第2期42-44,65,共4页
Metal Mine
关键词
高砷硫难浸金精矿
氧化亚铁硫杆菌
细菌氧化预处理
High arsenic high sulfur refractory gold concentrate, ThiobaciUus ferrooxidans, Bio-oxidation pretreatment
