亚铁离子加氧浸出钴中间品的钴

以钴中间品为原料,在鼓风氧化条件下,采用硫酸亚铁浸出钴中间品的钴,Fe²⁺能将Co³⁺还原为Co²⁺,同时,Fe²⁺与氧气作用生成FeOOH时产生酸,产生的酸可进一步浸出钴中间品。较优的工艺条件为:温度80℃、Fe/Co摩尔比1.05、液固比8、浸出时间3 h、鼓风量8 L/min、电位285 mV,在此条件下,Co浸出率达到99.7%。该方法无需加酸、碱、还原试剂,环境友好,为钴中间品原料的浸出探索了一条新的解决路径。     

分光光度法和光度滴定法联合测定湿法炼锌流程中钴渣浸出液中锌钴镍

湿法炼锌流程中钴渣浸出液中含有高浓度的Fe²⁺和Mn²⁺,用分光光度法测定Co²⁺和Ni²⁺时,Fe²⁺-EDTA会严重干扰Co²⁺和Ni²⁺的测定;在用光度滴定法测定Zn²⁺和Co²⁺合量时,Ni²⁺对二甲酚橙指示剂具有封闭作用,Mn²⁺亦与EDTA螯合,导致滴定结果偏高。为消除Fe²⁺和Mn²⁺对Zn²⁺、Co²⁺和Ni²⁺测定的干扰,实验进行氧化分离Fe²⁺和Mn²⁺预处理,在NaAc/Hac缓冲体系下,以EDTA作显色剂用分光光度法测定Co²⁺、Ni²⁺。在波长466nm处,Co²⁺的线性范围为50~500mg/L时与吸光度呈线性,相关系数R²为0.9992;在384nm处,Ni²⁺的线性范围为50~500mg/L时与吸光度呈线性,相关系数R²为0.9998。根据分光光度法测出Ni²⁺物质的量,加入1.1倍的丁二酮肟以除去Ni²⁺,用二甲酚橙为指示剂,EDTA鳌合-光度滴定法测定Zn²⁺、Co²⁺合量,扣减Co²⁺含量得出Zn²⁺含量。选取4个锌湿法炼锌流程中钴渣浸出液实际样品,按照实验方法中的分光光度法测定Co²⁺和Ni²⁺,光度滴定法测定Zn²⁺、Co²⁺合量,Zn²⁺、Co²⁺和Ni²⁺测定结果的相对标准偏差(RSD,n=6)均不大于0.70%,加标回收率分别为99.59%~100.41%、99.69%~100.64%、99.92%~100.08%。     

降低高酸高铟预中和石膏渣含铟量的工艺研究

湿法炼锌赤铁矿法回收铟的主要工艺流程为利用二氧化硫还原浸出低酸浸出渣中的铟，还原浸出后液酸度约30 g/L,需要预先中和使酸度降至10 g/L,然后加入碳酸钙中和沉铟、富集铟，沉铟渣经浸出、净化、萃取等工艺流程回收铟。预中和过程中产生的石膏渣会夹带部分铟，造成铟的损失。本文通过进行单因素试验，研究预中和液中Fe³⁺浓度、终点酸度及反应时间等试验条件变化对预中和石膏渣含铟量、石膏渣沉降及过滤性能的影响。试验结果表明，由于In³⁺与Fe³⁺性质相似，在黄钠铁矾形成过程中，In³⁺可部分取代Fe³⁺形成晶间化合物进入渣中，因此Fe³⁺含量越高，预中和石膏渣含铟量越高；终点酸度小于10 g/L时，溶液中的Al、Si易生成胶状物，与Ca化合生成钙铝黄长石沉淀，影响矿浆沉降性能及过滤性能，终点酸越低，石膏渣含铟量越高，过滤性能越差；随着反应时间的延长，溶液中Fe²⁺氧化成Fe³⁺的量越多，石膏渣含铟量逐渐增加。     

一种针铁矿除铁槽气体分布器

锌氧压浸出针铁矿除铁工艺采用空气或氧气作氧化剂,将Fe²⁺氧化成Fe³⁺,然后以针铁矿形态沉淀下来。本文结合丹霞冶炼厂现场生产,针对除铁槽内氧气碰嘴易堵塞、反应不够充分的问题,研究设计一种气体分布器,通过优化分布器的结构及布置方式,解决在使用过程中堵塞问题,精准控制高铁各反应桶富氧用量,缩短反应时间,提高氧气利用率,实现高效沉铁。     

印尼某红土矿硫酸加压浸出矿物组成变化研究

印尼苏拉威西岛La-paopao矿区红土镍矿储量约7326万吨,含镍约为1.25%,以此红土镍矿为对象,系统分析了矿样中主要矿物的种类、赋存状态及产出特征。结果表明:矿样含Fe(40.15%),Ni(1.42%),Co(0.15%),Mg(0.37%),SiO₂(6.92%)(质量分数),是典型的褐铁型红土镍矿;组成矿物主要为针铁矿、水针铁矿、高岭石、硬锰矿等;镍钴主要以类质同象或在结晶过程中以机械夹杂形式分布于褐铁矿中,其次分布于硬锰矿中,还有部分以独立矿物镍钴土矿形式存在。基于矿物特征,采用硫酸高压浸出工艺处理该红土镍矿,在最佳工艺条件下,镍浸出率超过96%,钴浸出率在97%以上,铁浸出率小于1%,实现了镍钴选择性提取。最后分析了渣中残余镍、钴未能浸出的原因以及各金属的浸出行为。未浸出镍钴部分可能存在于锰土矿中,另一部分则在Fe³⁺和Al³⁺高温水解沉淀过程中被夹带进入浸出渣。在高温下Fe³⁺强烈水解并释放出酸,Al³⁺大部分水解并释放出酸,并沉淀入渣。     

硫酸高铁铵滴定法测定制备金属钛的电解质熔盐中Ti2+和Ti3+

利用TaσakoBa（硫酸高铁铵滴定法）的基本原理,在CO₂保护气氛下,分两步测定出金属钛电解质中的Ti²⁺、Ti³⁺,以及低价钛的合量（Ti²⁺+ Ti³⁺）。文中采用HCl-HF溶解试样,用H⁺氧化Ti²⁺为Ti³⁺,用硫酸高铁铵氧化Ti²⁺和Ti³⁺为Ti⁴⁺,用三氯化钛标准滴定溶液滴定过量的Fe³⁺。文中对影响测定结果的关键因素,如硫酸高铁铵加入量、反应酸、标准滴定溶液、氧气干扰等进行了试验,确定最佳反应条件。在优化的条件下,测定了两个金属钛电解质中的低价钛,结果的相对标准偏差（RSD,n=8）均小于10%。纯物质Ti₂O₃和TiO的加标回收率在97%以上,满足分析要求。     

粗硫酸镍中铁钴钙镁深度脱除的工艺研究

研究了以臭氧和氟化钠为脱杂试剂,采用"溶解造液--强氧化除铁钴--氟化除钙镁--结晶析出"为主干的工艺处理粗硫酸镍,深度脱除其中的铁、钴、钙、镁杂质的工艺可行性及最佳工艺条件。试验结果表明,以臭氧为强氧化剂,可深度脱除粗硫酸镍中的铁钴杂质,最佳反应条件为:反应温度80℃,时间8h,终点pH值4.5~5.0,反应终点溶液中铁、钴浓度小于0.005g/L;以氟化钠做添加剂,可深度脱除粗硫酸镍中的钙镁杂质,最佳反应条件为:反应温度90℃,时间2h,pH值5.5,氟化钠添加系数1.5,反应终点溶液中钙0.007g/L,镁0.005g/L;将"强氧化除铁钴"与"氟化钠除钙镁"工序相结合,可获得更好的除杂效果。     

用NaClO3氧化-针铁矿法从氯化体系中去除铁试验研究

研究了以NaClO₃为氧化剂，采用针铁矿氧化还原法从氯化体系中去除Fe²⁺,考察了溶液pH、NaClO₃溶液加入量、反应时间和反应温度对铁去除率的影响。结果表明：在加入针铁矿晶种、溶液pH=2.5、NaClO₃溶液加入量20 g/L、反应时间4 h、反应温度85℃条件下，铁去除率可达99.96%,去除效果较好。     

黄钠铁矾渣中有价金属富集回收研究

某企业镍电解精炼除铁工艺经过改造后,产出的黄钠铁矾渣中除镍铜钴铁外,其他杂质含量非常低。通过试验,这种黄钠铁矾渣中镍的回收率大于97%,铜的回收率大于92%,99%以上的铁进入终渣,可作为铁精矿销售。整个过程不产生废渣,有价金属综合利用率高。     

不同萃取剂从赤泥浸出液中萃取分离铁钙试验研究

研究了用P204、P507萃取分离赤泥浸出液中的铁、钙，考察了萃取剂的体积分数、水相pH、萃取温度、萃取时间和相比V_O/V_A对铁、钙萃取分离的影响，确定了2种萃取剂的最佳萃取试验条件，对比了萃取性能。结果表明：有机相组成为40%P204+60%磺化煤油时，在水相pH=1.4、萃取温度50℃、萃取时间15 min、相比V_O/V_A=1/1条件下，Fe³⁺萃取率为94.29%,Ca²⁺萃取率为5.07%,P204可较好萃取分离铁和钙；有机相为30%P507+70%磺化煤油时，在水相pH=2.5、萃取温度40℃、萃取时间15 min、相比V_O/V_A=3/1条件下，Fe³⁺萃取率可达99.67%,Ca²⁺萃取率为1.95%;P204、P507都能从赤泥浸出液中萃取分离铁、钙，相较而言，P507萃取分离性能好于P204。     

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.