碱浸提钛渣提硅实验过程及其动力学研究

硫酸氢铵焙烧高钛渣提钛后的滤渣中存在大量的硅,对苛刻碱浸渣提硅实验过程中各参数的影响进行系统的研究。结果表明:在反应温度220℃,苛性碱与浸出渣质量比为3.5∶1,液固比5.5∶1,反应时间50 min,搅拌速度400 r/min的实验条件下,SiO_2提取率可达78.4%。碱浸过程动力学分析表明此反应过程受内扩散控制,反应的表观活化能为24.047 kJ/mol,动力学方程为:1+2(1-x)-3(1-x)~(2/3)=2.415exp[-24 047/(RT)]·t。     

焙烧钛渣的反应动力学研究

研究了钠化钛渣加碱焙烧过程的反应动力学、焙烧反应控制步骤,探讨了反应温度、碱渣质量比、钛渣粒度对TiO_2提取率的影响。试验结果表明:在适宜条件下,TiO_2提取率为92%,烧渣TiO_2品位达98.68%;钛渣焙烧优化工艺条件为焙烧温度900℃,碱渣质量比4∶6,钛渣粒度-200目,焙烧时间60min;扩散与化学反应的混合控制作用是影响钛渣焙烧效果的最主要因素,焙烧反应符合收缩未反应核模型,表观活化能为57.39kJ/mol,焙烧动力学方程可描述为1+2(1-x)-3(1-x)~(2/3)=3.532 3exp(-57 390/(RT))·t。     

含铜渣氧压酸浸动力学研究

研究了含铜渣氧压酸浸工艺过程中酸浸动力学、酸浸溶出规律和溶出反应的控制步骤,探讨了反应温度、硫酸浓度、浸出压力对铜浸出率的影响。结果表明:在最佳实验条件下,铜浸出率达96.06%。含铜渣酸浸的最优工艺条件是在600 r/min搅拌速度下,液固比5∶1,压力1.2 MPa,20%酸浓度,120℃酸浸150 min。含铜渣的氧压酸浸过程符合收缩未反应核模型,氧压酸浸为界面化学反应控制,经过计算扩散激活能Ea为31.15k J/mol,含铜渣与硫酸酸浸的动力学方程可描述为:1-(1-x)~(1/3)=71.39exp[-31150/(RT)]·t。     

氯化法钛白粉用UGS渣制备工艺及机理研究

开展了活化焙烧一步酸浸法代替活化焙烧两步酸浸法制备UGS渣的研究。结果表明,活化焙烧一步酸浸法最优工艺为:在Na_2CO_3与钛渣质量比4∶6、焙烧温度900℃、焙烧时间1 h的条件下焙烧,所得焙烧产物经20%盐酸在110℃沸腾条件下酸浸1.5 h,煅烧后,获得Ti O2品位为96.66%、回收率94.5%左右,CaO+MgO含量小于0.5%,Fe含量0.5%,SiO_2含量0.7%,Al_2O_3含量0.9%的UGS渣。该制备过程的优点是黑钛石类矿物被活化后形成易溶出矿相,焙烧产物呈板条状,为酸浸除杂充分反应提供了条件。同时,将两步酸浸工艺减少为一步酸浸,可有效降低废酸排放和能源消耗。     

钒渣无焙烧加压酸浸过程研究

针对现有产业化钒渣"焙烧-浸出"提钒工艺冶金废弃物多的现状,采用钒渣"无焙烧-加压酸浸"工艺进行了试验研究,考察了浸出温度、液固比、浸出时间、初酸浓度及搅拌速率对转炉钒渣中钒、钛、铁浸出率的影响,绘制了高温(150℃)条件下V-Fe-H2O系E-p H图,并分析了钒渣矿物中各组分在该条件下与H2SO4反应的可能性、有价金属转入溶液的理论限度和生成物的稳定状态。150℃V-Fe-H2O系高温Ep H图结果表明:150℃时,在H2O及Fe2+的稳定区范围内,钒铁尖晶石(Fe O·V2O3)能够在p H1.5的强酸条件下分解,可溶性钒离子主要以VO2+的形式在体系中充分浸出;通过无焙烧-加压酸浸试验,得到粒度-0.075~+0.055 mm钒渣的最优酸浸工艺参数为:浸出温度130℃、浸出时间90 min、初酸浓度200 g·L-1、液固比10∶1、搅拌速率500 r·min-1。结果表明:在最优工艺条件下,通过无焙烧-酸浸能够使钒渣中的钒浸出率达96.93%,铁浸出率为92.33%,钛浸出率为15.95%,并在渣中富集。     

沸腾焙烧烟灰浸出金、银、铜的研究

采用酸浸—氰化工艺从某沸腾焙烧烟灰中浸出金、银、铜。结果表明,较优工艺为:酸浸硫酸浓度1.0mol/L,液固比4∶1,反应温度90℃,反应时间4h,搅拌速度300r/min;氰化浸出反应液固比3∶1,氰化钠浓度0.2%,pH 10~11,反应时间48h,搅拌速度300r/min。此条件下,金、银、铜的浸出率分别为97.16%、79.98%、96.04%。     

硫酸铵焙烧钛渣的反应动力学研究

对硫酸铵焙烧钛渣提取TiO2的焙烧过程进行了动力学研究,考察了焙烧温度、钛渣粒度和硫酸铵与钛渣质量比对TiO_2提取率的影响。结果表明:硫酸铵焙烧钛渣过程受化学反应控制,焙烧反应的表观活化能为66.59kJ/mol,动力学方程为1-(1-x)~(1/3)=0.246 2×10~3exp[-66 587/(RT)]×t。     

降低白钨矿浸出渣钨损失率的试验研究

采用苏打压煮浸出工艺处理河南某白钨矿,为了使浸出渣中钨含量从原有的4%降至0.5%以下,探究了焙烧时间、碳酸钠浓度、压浸时间和搅拌速度对白钨矿浸出渣中钨损失率的影响。结果表明：在焙烧时间40 min、碳酸钠浓度160 g/L、压浸时间120 min、搅拌速度300 r/min、压浸温度205℃、液固比5∶1条件下,浸出渣中钨含量低于0.15%,基本实现了浸出渣中钨损失率的最小化,可为企业生产提供一定的参考价值。     

从黏土型锂矿中高效浸出锂的研究

采用焙烧—酸浸的方法从某Li_2O品位为0.64%的黏土型锂矿中浸出锂,考察了焙烧时间和焙烧温度对Li_2O浸出率的影响,利用正交试验研究了酸浸工艺中浸出温度和时间、硫酸浓度和液固比对Li_2O浸出率的影响。结果表明,黏土型锂矿在600℃焙烧30min后,锂焙烧渣在浸出温度90℃、浸出时间30min、硫酸浓度1.5mol/L、浸出液固比为6的条件下搅拌浸出,Li_2O浸出率最高达92.97%,浸出效果良好。     

低品位红土镍矿焙烧-碱浸过程中硅的转化

针对目前红土镍矿碱法处理过程中存在的问题提出工艺改进,研究低品位红土镍矿焙烧活化-碱浸过程中含硅矿物的转化。考察了焙烧温度对红土镍矿活性的影响,探索了红土镍矿经焙烧后碱浸过程中温度、时间、搅拌强度、液固比以及碱初始质量浓度对硅转化的影响。结果表明,红土镍矿经650 °C焙烧2 h后,活性得到明显提高,红土镍矿经焙烧后采用初始质量浓度为60 g/L的碱溶液,在搅拌速度为400 r/min、浸出温度为140 °C、液固比为5∶1的条件下浸出120 min,硅的转化率可达89.42%。     

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.