白烟尘两段逆流浸出工艺研究

针对白烟尘既富含铜、铅、锌、铋等多种有价金属，又含有砷、镉等有害元素的特点，提出一种两段逆流浸出工艺。采用该工艺进行实验处理某铜冶炼厂生产的白烟尘，分别考察了酸浸方式、初始硫酸质量浓度、酸浸液固比、酸浸温度、酸浸时间对铜砷浸出的影响。探索出最佳工艺条件液固比为4∶1，初始硫酸质量浓度80g/L，反应温度为80℃，反应时间为2 h。二次浸出液返回继续浸出白烟尘，此时白烟尘铜、锌、砷浸出率分别为95.7%、98.5%、92.2%，而浸出渣中铜、锌、砷品位降至0.42%、0.50%、1.28%。铅、铋的品位实现有效富集，二次酸浸渣中品位分别为47.73%和9.72%，相比原料分别富集约2.6倍和4.5倍。     

金铜冶炼高砷烟尘酸浸工艺研究

针对金铜冶炼产出的高砷烟尘,进行了酸浸工艺回收有价元素的研究。由白烟尘多元素分析和物相分析结果可知,采用硫酸直接进行浸出是可行的。对影响酸浸的因素分别进行了考察,确定了最佳工艺条件:反应温度40℃以上,溶液酸度85 g/L,液固比3:1,浸出时间2 h。此条件下,铜、砷、锌的浸出率分别高达96%、91%、97%以上,达到了从高砷白烟尘中分离有价元素的目的。本实验为该类白烟尘的利用提供了处理依据。     

高砷锡烟尘碱性浸出脱砷试验研究

采用氢氧化钠浸出高砷锡烟尘进行脱砷试验研究,在氢氧化钠浓度150 g/L、双氧水与烟尘质量比0.15、液固体积质量比5:1、反应时间4 h、反应温度90℃的条件下,砷浸出率92.5%,浸出渣含砷1.5%。浸出渣回收锡、铟,碱浸液冷却结晶回收砷酸钠,实现高砷锡烟尘中砷与锡、铟的有效分离。     

铜冶炼白烟尘综合回收研究

介绍了铜冶炼白烟尘在不同浸出体系下的浸出效果。结果表明,酸浸体系较水浸、碱浸体系效果更好。在H2SO4浓度2mol/L、液固比4:1、温度50℃、浸出时间2h、搅拌速度400r/min的最佳酸浸条件下,铜、锌、砷、镉和铁的浸出率分别为99.75%、99.81%、86.85%、95.85%和57.83%。采用铁粉置换-铁盐沉砷-中和沉锌镉的方法从酸浸液中回收Cu、As、Zn和Cd,在最优条件下,铜、砷、锌和镉回收率分别为99.70%、98.81%、99.47%和99.98%。     

氧化浸出法从黑铜泥中分离回收铜砷试验研究

研究了采用氧化浸出法从黑铜泥中综合回收铜砷,考察了酸度、双氧水用量、温度、浸出时间、液固体积质量比对铜和砷浸出率的影响。结果表明：在酸度200 g/L、双氧水用量30%、温度80℃、浸出时间2.0 h、液固体积质量比9∶1条件下,铜、砷浸出率达99.53%和98.24%;氧化酸浸液按n(NaHS)/n(Cu)=1.1加入硫氢化钠进行沉铜,铜砷分离后液中铜质量浓度低于0.01 g/L,砷质量浓度大于40 g/L,铜砷得到有效分离;富砷液通入二氧化硫还原,可得到三氧化二砷和还原后液,还原后液可返回氧化浸出。     

钙盐体系氯化法回收铜冶炼白烟尘酸浸渣中的铋

采用钙盐体系氯化法回收铜冶炼白烟尘酸浸渣中的铋,优化了浸出试验、中和试验、硝酸溶解—铁粉置换试验的影响因素,考察了浸铋前液循环利用对铋浸出效果的影响。结果表明:在液固比4∶1,浓硫酸用量30 g/L,氯化钙用量80 g/L,浸出温度65℃,浸出时间2 h的最佳条件下,铋浸出率达93. 6%;中和试验采用碳酸钙调节溶液pH值为3. 0,得到铋质量分数高于50%的氯氧化铋,铅、锑、铋的沉淀率在99%以上,银、砷、钙的沉淀率分别为90%、60%、18%;氯氧化铋经硝酸溶解,铁粉置换,可得到质量分数高于92%的海绵铋。浸铋前液循环利用于浸出工艺可获得良好指标。钙盐体系氯化法实现了含高浓度氯离子溶液的循环利用,降低了企业生产成本,为冶炼企业湿法回收铜冶炼白烟尘酸浸渣中的铋提供参考。     

高砷含铋净化渣处理工艺研究

研究“碱浸脱砷-酸浸除铜-中和沉铜”回收高砷含铋净化渣中铋、铜的处理工艺.碱浸脱砷控制终点游离碱度40 ～50g/L,砷浸出率达到86.3％、氯浸出率达到96.4％;酸浸除铜控制酸度100g/L,铜浸出率达到90.9％,酸浸渣中铋含量高达40％,可作为优质原料进入铋反射炉冶炼生产4N精铋;中和沉铜pH值7～8,沉铜渣含铜高达52.12％,可作为生产硫酸铜等化工产品的原料.     

铜冶炼烟尘选择性湿法脱砷及有价元素的同步回收

针对铜冶炼系统含砷烟尘中砷难以高效富集和脱除的问题,采用水浸-碱浸两步浸出工艺进行脱砷研究。结果表明：含砷烟尘先在液固比1∶1的条件下常温水浸,然后在NaOH浓度2 mol/L、Na₂S浓度0.2 mol/L、温度70℃、液固比4∶1的条件下碱浸,最终砷的平均浸出率为96.27%,浸出渣含砷量小于0.5%,铜、铁、锌、铅的平均浸出率分别为0.01%、0.01%、4.72%和11.17%。     

氧压浸出处理黑铜泥

氧压浸出工艺作为一种强化冶金技术,具有技术指标稳定、作业环境良好、生产成本较低的特点,且对黑铜泥中砷浸出效果优于常规氧压酸浸、氧压碱浸。采用氧压浸出工艺处理黑铜泥,探索了硫酸初始浓度、压力、反应温度、液固比、反应时间等对铜、砷浸出的影响。结果表明,在液固比8 mL/g、硫酸初始浓度80 g/L、反应温度120 ℃、氧分压0.3 MPa、反应时间2 h的条件下,铜、砷浸出率分别达到99.78%、97.08%,其中砷浸出率分别比氧化酸浸、氧化碱浸工艺高出7.79、9.76个百分点。是黑铜泥浸出处理工艺的良好选择,适合常规铜冶炼企业技术升级改造。     

用浓硫酸活化—稀硫酸浸出工艺从铅烟尘中浸出铜锌镉砷

研究了对含砷铅冶炼烟尘以浓硫酸活化、再用稀硫酸浸出铜、锌、镉、砷,考察了浓硫酸与烟尘体积质量比、活化时间、活化温度对烟尘活化及浸出酸度、浸出时间、浸出温度、液固体积质量比对铜、锌、镉、砷浸出率的影响。结果表明：铅烟尘先经浓硫酸活化,再用稀硫酸浸出,铜、锌、镉、砷浸出率得到提高;铅烟尘在酸矿体积质量比1.1/1、活化时间1 h、活化温度80℃条件下活化,再在硫酸质量浓度60 g/L、液固体积质量比6/1、温度60℃、浸出时间90 min、搅拌速度300 r/min条件下浸出,铜、锌、镉、砷浸出率分别为97.6%、98.2%、95.7%、86.0%,浸出渣主要成分为PbSO₄,配料后可返回铅冶炼系统。     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.