低品位硫化铜矿细菌浸出

采用正交实验方法,考察了矿石粒度、矿浆含量、接种量对大冶露天矿石和井下矿石的摇瓶浸出过程的影响.结果表明:粒度对露天矿和井下矿的酸耗影响大,对井下矿的浸出率影响高度显著; 矿浆含量对酸耗影响大,对浸出率则不显著; 在接种的初期,接种量对酸耗与浸出率都有影响,2d后接种量的影响消失; 井下矿浸出的最优工艺条件为:粒度<0.154mm,矿浆含量10%,接种量10%; 露天矿浸出的最优工艺条件为:粒度<0.154mm,矿浆含量20%,接种量7.5%.     

STUDY ON BIOLEACHING OF PRIMARY CHALCOPYRITE ORE WITH THERMOACIDOPHILIC ARCHAE

1. Introduction There have been two difficulties encountered with the leaching of low-grade primary chalcopyrite oresusingmesophile culture-thiobacillusferrooxidans(Tf) and thiobacillusthiooxidans(Tt), and so on[1-3].The first is the poor leaching effect and the second is the resultant increase in temperature during the middle and the later phase ofheap-leachingperiod, which is unfavorable for the growth and the culture of Tf and Tt. Being widely used for mineral leaching at present, Tf and …     

从细菌浸出角度探讨生物冶金制备超高纯阴极铜的技术潜力

从热力学、电化学、溶液化学等方面,研究和探讨了细菌浸铜溶液体系中杂质的行为。结果表明,细菌浸出条件下,由于铜浸出体系酸度低、细菌的选择性浸出以及溶液化学行为,影响阴极铜质量的杂质在细菌浸出液中含量低。细菌浸出为萃取—电积制备超高纯阴极铜奠定了良好的基础。     

微生物浸出低品位铜矿的研究

进行了微生物浸出低品位铜矿的研究。用从矿山分离的对Fe2+和元素硫氧化活性高的细菌浸出低品位黄铜矿,摇瓶浸出21d,矿石中铜的浸出率为26.8%;柱式渗滤浸出32d,矿石中铜的浸出率为14.5%。     

微生物浸出技术在处理低品位原生硫化铜矿中的应用及研究进展

介绍了国内外微生物浸出技术的发展概况,综述了原电池效应、金属阳离子催化作用、表面活性剂催化作用和外加电压催化作用等强化低品位原生硫化铜矿微生物浸出的研究进展,指出了需进一步研究及解决的问题。     

Effect of technological factors on bacterial leaching of low-grade Ni-Cu sulfide ore

1　ＩＮＴＲＯＤＵＣＴＩＯＮＢａｃｔｅｒｉａｌｌｅａｃｈｉｎｇｗｉｔｈａｕｔｏｔｒｏｐｈｉｃｂａｃｔｅｒｉａ ,ｓｕｃｈａｓＴｈｉｏｂａｃｉｌｌｕｓｆｅｒｒｏｏｘｉｄａｎｓ (Ｔ .ｆ.) ,ｈａｓｂｅｅｎｅｘｔｅｎｄｅｄｔｏｓｏｍｅｐｏｌｙｍｅｔａｌｌｉｃｓｕｌｆｉｄｅｏｒｅｓ[1] .ＡｆｅｗｏｆｐａｐｅｒｓｏｎｂｉｏｌｅａｃｈｉｎｇｏｆＮｉ Ｃｕｓｕｌｆｉｄｅｏｒｅｗｅｒｅｐｕｂｌｉｓｈｅｄ .Ｔｏｒｍａ[2 ] ｒｅｐｏｒｔｅｄｔｈａｔｔｈｅｌｅａｃｈｅｄＮｉ,ＣｕａｎｄＣｏｗｅｒｅａｌｌｏｖｅｒ 6 0 %ｉｎ 10ｄ…     

氢氧化钠滴定法测定湿法冶金的生物浸出液中硫酸

用氢氧化钠滴定法测定湿法冶金的生物浸出液中硫酸,由于浸出液中存在大量三价铁,当用盐酸羟胺还原铁时产生的酸使测定结果偏高。为了克服这种影响,建立了根据溶液中铁(Ⅲ)含量修正硫酸量的数学模型。硫酸的滴定值经用该数学模型修正后与推荐值十分接近。对硫酸含量为34.58 g/L和29.17 g/L的浸出液进行标准加入回收和精密度试验,测得回收率在98%~102%之间,相对标准偏差分别为1.11%和0.97%(n=12)。     

Optimization of separation processing of copper and iron of dump bioleaching solution by Lix 984N in Dexing Copper Mine

The effects of the concentration of Lix 984N, phase ratio, initial pH value of aqueous phase and extraction time on the extraction of copper and iron under the condition of low Cu^2＋/Fe^3＋ ratio in dump bioleaching solution of Dexing Copper Mine were explored. The optimal conditions of extraction are as follows： the concentration of Lix 984N 10%; the phase ratio （O/A） 1：1; the initial pH value of aqueous phase 1.5 and the mixing time 2 min. The stripping experiments show that H2SO4 solution could efficiently recover copper from the organic phase under the optimal conditions.     

How will biomining be applied in future？

This paper reviews the current status of commercial biomining operations around the world, identifies factors that drive the selection of biomining as a processing technology, describes challenges to exploiting these innovations, and concludes with a discussion of biomining＇s future. Biomining is commercially applied using engineered dumps, heaps and stirred tanks. Overcoming the technical challenges of lowering costs, processing low-grade, low-quality and complex ores and utilizing existing capital investments at mines requires better understanding of microbial activities and innovative engineering. Surmounting biomining commercial challenges entails improved mining company/biomining innovator cooperation and intellectual property control.     

Bioleaching of pyrite by A. ferrooxidans and L. ferriphilum

Pyrite oxidation rates were examined under various conditions in the presence of A.ferrooxidans and L.ferriphilum,in which different pulp concentration,inoculation amount,external addition of Fe3+ and initial pH value were performed.It is found that A.ferrooxidans and L.ferriphilum show similar behaviors in the bioleaching process.The increasing pulp concentration decreases the leaching rate of iron,and external addition of high concentration Fe3+ is also adverse to leaching pyrite.The increased inoculation amount and high initial pH value are beneficial to leaching pyrite,and these changed conditions bring more obvious effects on leaching pyrite by L.ferriphilum than by A.ferrooxidans.The results also show that adjusting the pH values in leaching process baffles leaching pyrite due to the formed jarosite.Jarosite formed in leaching process was observed using XRD,SEM and energy spectrum analysis,and a considerable amount of debris with a crystalline morphology is present on the surface of pyrite.The results imply that the indirect action is more important for bioleaching pyrite.