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1. 发明授权

US06461577B1 Two-stage bioleaching of sulphidic material containing arsenic 有权
标题翻译：包含砷的硫化物质的两阶段生物浸出
公开(公告)号：US06461577B1
公开(公告)日：2002-10-08
申请号：US09551575
申请日：2000-04-18
申请人： Börje Lindström , Åke Sandström , Jan-Eric Sundkvist
发明人： Börje Lindström , Åke Sandström , Jan-Eric Sundkvist
IPC分类号： C22B1100
CPC分类号： C22B3/18 , C22B11/08 , Y02P10/234
摘要： A method of leaching sulphidic material that contains metals and arsenic under oxidising conditions and with the aid of microorganisms is characterised by mixing the material with an acid aqueous solution to form a pulp, and in that the material is leached in a first leaching stage at a pH of below 2 and at a temperature that ranges from room temperature to about 55° C. in the presence of an active quantity of microorganisms of the mesophilic and/or moderately thermophilic type, wherewith the major part of the arsenic content of the material and possibly also part of its metal content is/are leached-out and the arsenic leached from said material is oxidised successively to a pentavalent state. The remaining leachable metal content of the material is leached-out in a following leaching stage in the presence of an active quantity of an extremely thermophilic micro-organism and at a temperature within the active range of said micro-organism, said temperature being higher than the temperature in the first stage. The pH is suitably raised in the second stage to a level at which the pentavalent arsenic present in solution is caused to transform to a solid state and precipitate-out as a metal-containing arsenate which is separate from the leaching solution together with unleached material in the pulp after termination of the leaching process.
摘要翻译：在氧化条件下并借助微生物浸出含有金属和砷的硫化物质的方法的特征在于将该材料与酸性水溶液混合以形成纸浆，并且其中该材料在第一浸出阶段浸出 pH在2以下，在温度范围为室温至55℃的温度下，在活性量的嗜温和/或中度嗜温型微生物的存在下，其中主要部分的砷含量的材料和也可能将其金属含量的一部分浸出，并且从所述材料中浸出的砷被连续氧化成五价状态。在活性量极度嗜热的微生物的存在下和在所述微生物的活性范围内的温度下，在随后的浸出阶段中将所述材料的剩余可浸出金属含量浸出，所述温度高于第一阶段的温度。将pH值适当地在第二阶段升高到使溶液中存在的五价砷转化为固体状态并作为含金属的砷酸盐沉淀出的水平，所述砷酸盐与浸出液与未浸提的材料一起分离浸出过程终止后的纸浆。

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