石煤流态化焙烧—酸浸提钒工艺研究

采用流态化焙烧—酸浸工艺从某含钒石煤中提钒,考察了流态化焙烧参数和浸出参数对钒浸出率的影响。结果表明,在焙烧温度750℃、焙烧时间15min、助浸剂氟化钙用量5%、硫酸体积浓度15%、浸出温度98℃、浸出时间6h、液固比1.5∶1的条件下,钒的浸出率可达83.90%。     

微波强化石煤提钒酸浸工艺的研究

在空白焙烧酸浸工艺的基础上考查微波加热浸出和常规加热浸出对某含钒石煤钒浸出率的影响。结果表明,在浸出温度98℃、焙烧样粒度-0.074mm占75%、硫酸体积分数20%、浸出时间90min、液固比1.5∶1(mL/g)时,微波加热的钒浸出率为88.2%,比相同条件下常规加热浸出高9个百分点。     

复合添加剂焙烧-稀酸浸出清洁提钒工艺研究

采用复合添加剂焙烧-稀酸浸出工艺提钒,考察了复合添加剂用量、焙烧温度、焙烧时间、硫酸用量、浸出时间、浸出温度及液固比对钒浸出率的影响。结果表明,在复合添加剂用量6%、焙烧温度800℃、焙烧时间3h,硫酸用量3%、浸出时间3h、浸出温度60℃和液固比3∶1的条件下,钒浸出率为85.6%,比钙化焙烧工艺的钒浸出率提高了13.4%。本工艺焙烧过程中产生的烟气污染较小,对环境相对友好,且能大幅度提高钒浸出率。     

钒钛磁铁矿精矿钾盐焙烧及酸浸提钒研究

以某钒钛磁铁矿精矿为原料,通过焙烧添加剂的选型试验确定了K_2SO_4为最优添加剂,焙烧与浸出过程中最佳工艺条件为:K_2SO_4添加剂用量4%、焙烧温度900℃、焙烧时间1h、浸出温度95℃、浸出时间1.5h、硫酸体积浓度15%、液固比3(mL/g),该条件下钒浸出率为75.54%,较相同条件下空白焙烧钒浸出率提高了约30个百分点。XRD和SEM分析表明,K_2SO_4对含钒矿物结构破坏明显,同时促进可溶的钒酸钾生成,大幅提高钒的浸出率。     

难处理石煤短流程提钒工艺研究

针对湖北某难处理石煤钒矿的矿石性质及岩相分析结果,采用短流程提钒工艺即沸腾焙烧—助浸剂酸浸—萃取—沉钒工艺进行提钒试验研究。重点考察了焙烧温度、焙烧时间、添加剂用量、硫酸浓度、液固比、浸出温度及浸出时间对钒浸出率的影响。结果表明,在焙烧温度750℃下焙烧20 min,该焙烧料在助浸剂用量5%、硫酸浓度15%、液固比2∶1、浸出温度95℃、浸出时间6 h的条件下,浸出率可达91.32%。采用N235为萃取剂,经3级正萃3级反萃,98%以上钒能从浸出液中分离出来并富集。富钒液经除杂后沉淀出偏钒酸铵,偏钒酸铵热解后可获得纯度99.75%的五氧化二钒产品。该工艺具有提钒流程短、提钒效率高及产品纯度高的优点,对难处理型石煤原矿适应性好。     

硅质石煤钒矿提钒新工艺研究

通过单因素条件试验确定了"空白焙烧-碱浸"和"氧化剂氧化-酸浸"这两种提钒工艺的最优工艺参数。试验结果表明:空白焙烧-碱浸的最佳工艺条件为矿样粒度0.074 mm、焙烧温度800℃、焙烧时间3 h、氧分压10~100Pa、浸出温度90℃、浸出时间3 h、烧碱浓度40 g/L、液固比1.5∶1.0,在此条件下钒的浸出率可达到83.8%,比传统的钠化焙烧-酸(碱)浸工艺提高20%以上。在矿物粒度0.074 mm、氧化剂MnO2用量为5%、硫酸浓度为40%(质量分数)、浸出温度为90℃、浸出时间为9 h、液固比为2.5∶1.0的条件下,氧化剂氧化-酸浸提钒工艺的钒浸出率可达72.4%,比传统的钠化焙烧工艺高出10%以上。     

石煤硫酸化微波焙烧提取五氧化二钒新工艺

采用硫酸化微波焙烧—水浸工艺从石煤中提取五氧化二钒,考察了硫酸用量、微波功率、粒径、微波焙烧温度和时间、添加剂NaF加入量、水浸液固比、水浸温度和时间对钒、铁、铝浸出的影响。结果表明,在下述最佳工艺条件下,五氧化二钒的浸出率达90%以上:硫酸用量30%、微波功率700 W、粒径0.08mm、200℃微波焙烧1h、NaF加入量3%、水浸时间1h、水浸液固比3∶1、水浸温度90℃。     

添加剂JDTV01对从石煤中浸出钒的影响

在石煤酸浸提钒过程中,加入代号为JDTV01的添加剂可明显提高钒的浸出率,减少硫酸用量。通过单因素试验和正交试验,考察了硫酸浓度、添加剂JDTV01用量、固液质量体积比、浸出温度、浸出时间等因素对钒浸出率的影响。结果表明:在硫酸浓度20%、添加剂用量1.5%、固液质量体积比1∶1、浸出温度95℃、浸出时间11h条件下,钒的浸出率达到98.4%。     

微波辅助硫酸浸出红土镍矿的研究

以红土镍矿为原料,研究了微波辅助硫酸浸出镍钴的工艺条件。考察了硫酸浓度、微波功率、微波温度、辐射时间、液固体积质量比对镍钴浸出率的影响。结果表明,在硫酸浓度3.0mol/L、微波功率700 W、微波温度90℃、辐射时间2.5 h、液固体积质量比4:1的最佳工艺条件下,镍浸出率达91%,钴浸出率65%以上。     

采用硫酸化焙烧 — 水浸工艺从锂云母精矿中提取锂

研究了采用硫酸化焙烧—水浸工艺从Li_2O品位3.23%的锂云母浮选精矿中回收锂,考察了焙烧过程中硫酸质量浓度、酸矿体积质量比、焙烧温度、焙烧时间,浸出过程中液固体积质量比、浸出温度、浸出时间对Li_2O浸出率的影响。结果表明:在硫酸质量浓度1 127 g/L、酸矿体积质量比1.5/1、焙烧温度150℃条件下焙烧12 h后,对焙烧渣在液固体积质量比3/1、室温下浸出40 min,Li_2O浸出率达98.39%,浸出效果较好。     

熔炼次数对M17返回料合金成分、组织和性能的影响

实验结果表明,M17铸造高温合金(%:0.16C、8.79Cr、5.79A1、4.93Ti、3.29Mo、15.20Co、0.78V、0.015B、0.073Zr、0.002S、0.001P、0.001 1O、0.001 0N)经25 kg真空感应炉返回重熔后,Si含量随重熔次数的增加而略有增加,合金中主要元素和其它杂质元素S、P、H的含量变化不大,而氧、氮略有增加;合金中初生碳化物由新合金中的草书体逐渐向返回合金块状转变,初生碳化物的遗传性堵塞合金凝固时的补缩通道,使返回料合金的疏松倾向增大,高温塑性下降较大。     

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.