从银阳极泥中回收金

研究了从银阳极泥中回收金.试验考察了酸洗除杂、氯化分金、SO2还原、金电解等参数对金回收率的影响.结果表明,银阳极泥经20～30 g/L硫酸溶液洗涤后,再以金质量2倍的氯酸钠、在液固体积质量比6∶1、酸度4 mol/L 、90 ℃条件下浸出5 h,然后在50～60 ℃下用40 m3/h流速的SO2还原粗金粉,粗金粉再经电解获得纯度99.992%的金.     

铅阳极泥中有价金属的分离研究

铅阳极泥经过自然堆放氧化后,在5mol/L硫酸介质中加入一定量的氯化钠(c(Cl-)=3mol/L)和氧化剂氯酸钠,液固比为5∶1,80℃控制电位氧化浸出4h。结果表明,当铅阳极泥堆放氧化4天以上,氧化剂用量大于20%,电位400～500mV时,铜、铋、锑、砷的浸出率均在99%以上,碲浸出率大于97%,金、银入液损失均小于1%,很好地实现了铜、铋、锑、砷、碲与金、银的分离。     

酸浸—萃取提金新工艺的生产实践

介绍祥云飞龙公司采用萃取方法从银电解阳极泥中提取黄金的生产实践。当金氯酸溶液酸度控制在2.0mol/L时,萃余液含金可控制在5 mg/L以下。该工艺操作简单,投资费用低,金回收率在99%以上,产品质量优异,经济效益良好。     

铅阳极泥中有价金属的综合回收

采用盐酸浸出铅阳极泥富集金银,考察盐酸浓度、反应温度、液固比、反应时间对盐酸浸出过程中铜、锑、铋、金、银的影响。研究结果表明,浸盐酸浓度为3 mol/L、液固比为8∶1、反应温度为85℃、反应时间为4 h时,铜、锑、铋的浸出率分别为98%、99. 5%、99. 6%;浸出后的铅阳极泥与浸出前相比,金、银富集2倍以上。     

从铜阳极泥分银渣中回收铋和锑

采用硫酸与氯化钠的混合溶液浸出铜阳极泥卡尔多炉分银渣。结果表明,铋、锑被浸出进入溶液,铅转化为硫酸铅留在浸出渣中,从而实现铅与锑、铋的分离。在硫酸浓度2.5mol/L、氯化钠浓度125g/L、液固比4∶1、温度95℃、浸出时间4h的条件下,铋、锑、铅、银的浸出率分别为98.67%、91.17%、0.56%和0.76%,金几乎不被浸出。     

回收铜阳极泥预处理上清液中银的工艺研究

采用碘化钠沉银-硫化钠转型-硝酸转型工艺回收铜阳极泥预处理上清液中的银,确定了最佳工艺条件.沉银率最高可达96.56%,沉银后液银含量降至4 mg/L;粗银粉纯度达95%以上.     

从富铅阳极泥中回收金属方法

波兰公布一项关于回收富铅阳极泥中金属的专利(No.14 9507)。阳极泥是经过脱铜处理的(≤2％Cu),含有银和其他贵金属。阳极泥中的铅主要呈硫酸盐形态。该专利提出构处理方法与众不同之处,就是把阳极泥置于 Na_2 CO_3(10-150g/L)溶液中。溶液中苏打的克分子量     

铅阳极泥氧化预处理工艺研究

铅阳极泥是粗铅电解精炼的中间产物,含有大量可进一步提取的有价伴生元素,如金、银、铅等元素.本文从生产实际出发,对铅阳极泥湿法预处理工艺进行研究,采用双氧水对铅阳极泥进行氧化预浸处理,并确定了最佳氧化预浸条件.试验表明,在双氧水用量为40 g、溶液盐酸浓度为4.5 mol/、液固比为6:1、浸出时间为3 h、浸出温度为8...     

铜阳极泥中硒铜银分离提取的基础条件研究

随着光导材料以及功能玻璃技术的不断发展,硒作为光学材料硫系玻璃合成的基础元素,其回收利用已成为研究热点。铜阳极泥中富含硒、铜、银元素,是重要的二次资源。采用H2SO4—MnO2浸出体系从铜阳极泥中浸出硒、铜、银的工艺,可实现硒、铜、银元素的选择性分步提取。研究了H2SO4浓度、浸出时间、浸出温度、MnO2添加量等对硒、铜、银浸出率的影响。同时,针对浸出液中硒、铜、银的选择性分离,还研究了NaCl添加量、Na2SO3添加量和浸出液pH值对于硒、铜、银沉淀率的影响。研究结果表明,在H2SO4浓度为1mol/L,浸出时间为1h,浸出温度为80℃,MnO2添加量为铜阳极泥质量的50%的基础条件下,硒、铜、银的浸出率分别达到95.34%、98.28%和99.32%,优于传统火法冶炼工艺,为含硒物料的绿色、高效分离提取提供了理论依据和数据支撑。     

阳极泥中铜的常压氧化预脱除及动力学分析

铜阳极泥富含金、银、铂、钯等贵金属和硒、碲等稀散金属,是稀贵金属提取的重要原料。然而,由于某铜阳极泥中铜含量大于10%,过多的铜会增加后续贵金属回收时浸出剂的消耗量,并严重影响金银的收得率,需预先脱除。本文在热力学分析及XRD、SEM-EDS等表征手段基础上,常压下于H₂SO₄介质中以MnO₂为氧化剂,对阳极泥进行预脱铜研究。分别考察了H₂SO₄浓度、MnO₂加入量、浸出时间、液固比、反应温度等因素对阳极泥中铜浸出率的影响,同时采用收缩未反应核模型对铜浸出过程进行动力学分析。结果表明：铜浸出过程的反应速率受扩散控制,其表观活化能为4.1 kJ/mol,在初始H₂SO₄体积浓度为100 g/L,MnO₂质量浓度为10 g/L,浸出时间为120 min,液固比为4∶1(单位：mL/g,下同),反应温度为80℃的条件下,铜的浸出率可达92.19%;同一条件下,部分砷、硒也被浸出,其浸出率分别维持在...     

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.