用溶剂萃取法从氧化锌矿浸出渣中回收锌

低品位氧化锌矿酸浸后,浸出渣中夹带3%以上的锌,采用水洗-P204萃取可回收酸浸渣中的水溶性锌,得到的反萃液经过净化后可电积沉锌。该工艺可与湿法炼锌工艺相结合处理低品位氧化锌矿。     

高锗锌原料湿法冶炼的实践

分析了锗在湿法炼锌浸出—净化过程中的行为,并通过实践确定了高锗锌原料湿法处理的工艺条件,介绍了存在的问题和解决措施。     

A new method for recovering valuable metals from low-grade nickeliferous oxide ores

A new method, the concentrated sulfuric acid acidolysis and water leaching (SAWL) of nickeliferous oxide ores, is proposed and the optimal conditions for recovery of nickel, cobalt and copper from a low-grade Chinese nickeliferous oxide ore are presented. A series of experiments were conducted which examined the effect of acid charge, acid curing temperature and acid curing time. Recoveries of up to 95%, 83% and 95% for Ni, Cu and Co, respectively were obtained with only the sulfuric acid at ambient temperature and atmospheric pressure. Comparing the percolation leaching with agitation leaching showed that percolation leaching was capable of extracting the valuable metals with water. The SAWL method was scaled to three-stages counter-current leaching tests using 1 kg of ore. The results indicate greater than 90% extraction for nickel and cobalt.     

现代锌处理技术的最新经验

自从1969年芬兰的科科拉（kokkola）锌厂投产以来，奥托昆普已在几个扩产阶段中开发并拓展了焙烧、浸出、净液和电积等锌厂工艺，开发出了取代黄钾铁矾工艺的奥托昆普转化浸出工艺、基于砷的奥托昆普净液工艺和奥托昆普精矿直接浸出工艺等新工艺。自收购了挪威锌公司奥达厂和德国ObemrSel的鲁奇冶金公司后，奥托昆普在焙烧、烟气净化、制酸和电积方面扩展了其技术诀窍。鲁奇冶金公司于1962年在印度第一次投入锌焙烧炉开始了其锌方面的商业运作，其后共有70多台鲁奇锌焙烧炉在世界各地投产。由于这些成绩，奥托昆普现在可以将目前的锌处理技术融合在一整套技术内。     

硫化镍精矿常压浸出研究

本文研究了温度、通氧速率、pH值、硫酸浓度等条件对硫化镍精矿常压浸出的影响,发现在80℃→85℃之间,镍浸出率随温度的升高而迅速增加,通氧条件下,镍浸出率差值的变化与通氧速率存在数学关系:y=8.271x0.3003,pH值为2.1~2.2时,镍浸出率最高,且镍浸出率随硫酸用量和铜离子的增加而升高。     

Optimization of efficient stable reagent of alkaline thiourea solution for gold leaching

1　INTRODUCTIONThiourea ,asanontoxic goldleachingreagentsubstitutingcyanide ,hasattractedtheinterestofmanyresearchersallovertheworldsincethedissolu tionofgoldinthioureasolutionwasfirstreportedin194 1,andaseriesofstudiesonthetheoryandtech nologyforleachinggoldbythioureahavebeencon ducted[1 3] .Mostreportson golddissolutioninthioureasolutionwereconcernedwithacidicmedia .Itwasdifficultforgoldtodissolveinalkalinesolutionbecauseofthepassivationofelementsulfurproducedbytheirreversibledecompositi…     

Concentrating Ge in zinc hydrometallurgical process with hot acid leaching-halotrichite method

1　INTRODUCTIONInthezincconcentratesfromHuidongLead zincMinelocatedinsouth westofChina ,therearerichraremetalssuchasGewhichhasverywideapplica tionsandhighvalue .However ,Gewaslargelywast edbecauseitwasdispersedinalotofresidues(halotrichiteresidue ,Ge Feresidueandhighacidleachedresidue)intheconventionalzinchydrometal lurgicalprocessforthezincconcentrates[1] .InordertoconcentrateandrecoverGe ,anovelhydrometal lurgicalprocess ,ie ,thehotacidleaching halotrichitemethodofzinchasbeendevelope…     

Solidification of Municipal Solid Waste Incineration Fly Ash with Cement and Its Leaching Behaviors of Heavy Metals

The solidifying qffect of cement addition on municipal solid waste incineration fly ash ( MSWFA for short, collected from the gas exhaust system of MSW incinerator), the interaction of MSWFA with cement and water and the leaching of heavy metals from cement-solidified MSWFA are investigated. The main results show that : ( 1 ) when MSWFA is mixed with cement and water, 112 evolution, the formation and volume expansion of AFt will take place, the volume expansion can be reduced by ground rice husk ash addition ; (2) heavy metals do leach from cement-solidified MSWFA and at lower pH more leaching will occur; (3) compared with cement - so-lidified fly ash, the leachate of solidified MSWFA is with higher heavy metal contents ; (4) with the increment of cement addition leached heavy metals are decreased ; and (5) concentrations of Zn , Mn , Cu and Cd in all the leachates can meet the relevant Standards of Japan, but as the regulations for soil and groundwater protection of Japan are concerned, precautions against the leaching of Pb , Cl^- and Cr^6 and so on are needed.     

Extracting gold from pyrite roster cinder by ultra-fine-grinding and resin-in-pulp

1　ＩＮＴＲＯＤＵＣＴＩＯＮＲｅｓｉｎ ｉｎ ｐｕｌｐｐｒｏｃｅｓｓｉｓａｎａｄｖａｎｃｅｄｔｅｃｈ ｎｉｑｕｅｏｆｅｘｔｒａｃｔｉｎｇ ｇｏｌｄｗｉｔｈｏｕｔｆｉｌｔｅｒ ,ｉｎｗｈｉｃｈｇｏｌｄｉｓｄｉｒｅｃｔｌｙｅｘｔｒａｃｔｅｄｆｒｏｍｃｙａｎｉｄｅｐｕｌｐｗｉｔｈｉｏｎｅｘｃｈａｎｇｅｒｒｅｓｉｎ .Ｉｔａｖｏｉｄｓｌｉｑｕｉｄｓｏｌｉｄｓｅｐａｒａｔｉｏｎ ,ｄｅｃｒｅａｓｅｓｌｏｓｓｏｆｇｏｌｄｉｎｔａｉｌｗａｓｈｉｎｇｓａｎｄｉｎｃｒｅａｓｅｓｔｈｅｒｅｃｏｖｅｒｙｏｆｇｏｌｄ[1,2 ] .353Ｅ…     

基于因素分析的复合神经网络及其在软测量中的应用

针对工业生产中,众多因素对生产影响程度不同的特点,提出了一种基于因素分析的复合神经网络(FA-MNN)模型.介绍了FA-MNN模型的结构,改进了神经网络的学习算法,并将其应用于氧化铝高压溶 出过程中苛性比值及溶出率的软测量,利用现场实际运行数据进行仿真,结果表明FA-MNN模型能有效实现苛性比值及溶出率的在线检测.