从高硅高碳钒矿中回收钒的工艺研究

介绍了一种从高硅高碳钒矿中回收钒的工艺,主要工序包括焙烧、硫酸浸出、P204+TBP+航空煤油萃取、氨水沉钒等,并研究了各工序的工艺条件.结果表明,该钒矿石于500℃下焙烧5 h,再磨矿至粒径小于75 μm,然后用硫酸两次浸出,钒浸出率最高可达96.83%;随后钒浸出液经P204+TBP+航空煤油溶液萃取及氨水沉钒,可...     

从钒精矿中湿法提取五氧化二钒新工艺研究

针对河南淅川页岩钒矿分级擦洗得到的钒精矿,研究了两段逆流硫酸浸出—中和—还原—萃取—铵盐沉钒新工艺。在矿石w(V2O5)=2.50%、粒度-500目、硫酸用量为矿石质量的50%、浸出液固体积质量比1.3∶1、浸出温度95℃条件下,五氧化二钒浸出率大于75%;浸出液中的钒用15%P204+10%TBP+75%磺化煤油溶液为有机相,在常温下5级逆流萃取,有机相与水相的流量比为1∶1,钒萃取率在98%以上;负载有机相中的钒用1.5 mol/L硫酸溶液在常温下5级逆流反萃取,有机相与水相流量比为5∶1,钒反萃取率在99%以上;反萃取液中的钒氧化后用铵盐沉淀多钒酸铵,然后在氧化气氛中热解2 h,获得五氧化二钒产品。五氧化二钒总回收率大于70%,产品纯度大于99%。此工艺钒回收率高,符合环保要求,有一定的推广应用前景。     

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。     

石煤焙烧物料提钒的试验研究

以石煤脱碳焙烧利用热值后的物料为研究对象。采用"硫酸+助浸剂浸出,浸出液经回调pH值及还原处理后萃取和反萃取,反萃取液氧化后经酸性铵盐沉钒等"工艺制取五氧化二钒。工艺参数:在物料粒径小于37μm(100%)、硫酸用量为50%、助浸剂用量为4%、液固比为2.5∶1、浸出温度为90℃、浸出时间为7 h等条件下浸出,在12.5%P204+5%TBP+82.5%磺化煤油为有机相、水相pH值为2、相比为2∶1、三级逆流萃取、1.5 mol.L-1硫酸三级逆流反萃取等条件下萃取和反萃取。结果表明:浸出过程经动力学分析,表观活化能为46.26kJ.mol-1,属于化学反应控制过程;钒总回收率达75%以上;V2O5产品纯度大于99%,符合GB3283-1987质量要求;全流程几乎无废气外排,废水经处理后循环使用率达97%以上,废渣可用于建材,属于清洁型提钒工艺。     

从石煤中提取五氧化二钒的工艺研究

根据陕西某石煤矿的特点，采用“氧化焙烧-硫酸浸出-P204萃取-硫酸反萃-氨水沉钒-煅烧”的工艺流程，进行了从石煤中提取V2q的试验研究，结果表明，石煤矿样于850℃焙烧2h后，在液固比1：1，浸出温度103℃的条件下，采用二段浸出方式，焙烧矿样用二次浸出的溶液补加少量硫酸进行一次浸出，一次浸出渣用在较高酸度下二次浸出，钒的总浸出率可达84％。浸出液经预处理后用氨水调节pH值至2．0左右，用P204萃取，经水洗后硫酸反萃，可得到较为纯净的钒溶液，再将其氧化后，经氨水沉钒、煅烧得到纯度大于98％的V2O5产品，全流程钒总回收率可达80％以上。     

酸浸-萃取-氨沉淀法从石煤钒矿中提取钒

采用氧化焙烧脱炭-硫酸氧化浸出-P204+TBP溶剂萃取-氨水沉钒的工艺方法,从江西某石煤钒矿中提取V2O5,考察了硫酸用量、萃取及反萃次数、反萃液pH值对工艺过程的影响。试验结果表明:钒矿破碎后在硫酸溶液中用氯酸钠进行氧化浸出,钒的浸出率可达到96%以上;用P204+TBP溶剂萃取和稀硫酸溶液反萃,再用氨水沉淀钒,最终得到纯度98.0%以上的V2O5产品;从石煤钒矿到V2O5的总收率可达86.14%～93.09%。该工艺对钒的回收效果明显,操作简单,生产成本低,对环境污染较小。     

从硫酸工业废催化剂中回收钒硅钾试验研究

研究了用浸出—萃取—沉淀—碱浸—蒸发结晶工艺从硫酸工业废催化剂中回收钒硅钾,分析了皂化P_20_4萃取四价钒的机制,考察了液固体积质量比、H_2SO_4质量浓度对水浸渣浸出效果的影响,以及萃取剂组成、水相初始pH、水相电位对钒萃取率的影响。试验结果表明:在液固体积质量比2.5∶1、H_2SO_4质量浓度120g/L条件下,钒浸出率在95.5%以上;在水相初始pH为1.9、电位-190mV条件下,以皂化的14%P204+7%仲辛醇+79%260#煤油作萃取剂萃取钒时,钒单级萃取率在96%以上;回收的五氧化二钒、液体硅酸钠、硫酸钾产品质量皆符合相应国家标准,钒、硅、钾回收率分别达92.1%、95.6%、94.3%。用皂化的P204萃取钒,萃取容量、萃取剂利用率及钒萃取率都较高,而且钒、铁分离效果较好,主产品五氧化二钒纯度较高。     

从某低品位石煤钒矿中浸出钒的工艺研究

研究了从某低品位石煤钒矿中浸出钒,主要考察了硫酸直接浸出、氧化焙烧—酸浸、氧化焙烧—碱浸和钙化焙烧—碳酸钠浸出等工艺对钒浸出率的影响。结果表明:造球氧化焙烧—酸浸流程工艺指标较好;在焙烧温度850℃、焙烧时间2h、酸用量为矿石质量60%条件下浸出6h,五氧化二钒浸出率达62.5%。     

用酸法从石煤中提取五氧化二钒的试验研究与工业实践

研究了采用“酸浸－P204萃取－硫酸反萃取－氨水沉淀－煅烧制精钒”工艺流程从西北含钒石煤中提取五氧化二钒。试验研究及工业应用结果表明，在无氧化剂存在下，于85℃，液固质量比1：1，矿石粒度－60目条件下，用硫酸溶液可以浸出石煤中约80％的钒，用P204和TBP的磺化煤油溶液萃取，硫酸溶液反萃取，可得到较纯的五氧化钒溶液，再经氨水沉淀，热解，可得到纯度98％以上的精钒产品。     

陕西某钒矿石钙化焙烧—酸浸工艺研究

研究了采用钙化焙烧—酸浸工艺从陕西某钒矿石中浸出钒,考察了焙烧温度、添加剂种类与用量、焙烧时间、空气通量、矿石粒度、浸出条件等对钒浸出的影响。试验结果表明,在矿石粒度-100目、焙烧温度920℃、加入4%CaCO3+2%CaCl2作添加剂、空气通量50m3/(m2·h)条件下焙烧4h,然后在硫酸总用量8%、液固体积质量比1.5∶1、常温条件下2段逆流浸出3h,钒浸出率达70%以上。     

Acceleration of Electricity Reform Brings Benefit to Big Electricity Users,Aluminum Manufacturers Can Save Costs Up to Several Hundred Million

<正>Recently the National Commission of Development and Reform again assembled experts to solicit opinions,and discussed new electricity reform program.According to information disclosed by experts attending the meeting,in the future electricity reform will undergo top-down design,possibly a     

Qinghai's Aluminum Processing Capacity to Rise at the End of the Year

正Since the release of Implementation Opinions on Carrying out‘Guiding Opinions of the State Council on Resolving Serious Production Overcapacity Conflicts’,according to the actual situation of industry,Qinghai has focused on electrolytic aluminum,cement,ironsteel(including iron alloy and silicon carbide),     

Recent Trends in China's Copper Scrap Market-Part Ⅱ

<正>2.Tianjin Scrap Metal Market In Tianjin,we mainly visited Jinghai Ziy Town scrap market and Binhai New Area’some copper scrap enterprises and enterprise using copper scrap.In Ziya we felt the coppe scrap market was particularly deserted,mos copper scrap enterprises in the town wer closed,industry insiders said in 2012 the plac here was bustling with activity.According to     

Shanghai Clearing House to Roll out Renminbi-denominated Copper Clearing Operations in Free Trade Zone

正Clearing House Financial Markets Co.,Ltd.(Shanghai Clearing House)General Manager Xie Zhong told the media recently at the briefing of the international symposium of"Reform Deepening and Mechanism Innovation of the Post-crisis Kerb Market",Shanghai Clearing House will explore the feasibility of carrying out bond business in     

Development and Application of New Materials for Copper Processing in China

正After over 60 years of developmnt,a system for RD and production of copper processing materials has already taken shape in China.After the reform and opening-up,the application of copper processing materials has gradually expanded from the military industry to civil field.The annual output of copper     

China’s Mineral Exploration Market Downturn Causes Decline of Investment in Bauxite

<正>According to a survey report conducted recently by China Geological Survey Development Research Center,in the first half of 2014,China’s mineral exploration market continued to decline,with the investment in exploration of non-fuel minerals dropping by13.7%and drilling workload dropping by21.7%.According to statistical analysis of the Center,     

Chinalco and China National Administration of Coal Geology Jointly Built Guangxi Rare Earth Industrial Base

正On June 3,Chinalco and China National Administration of Coal Geology signed cooperation agreement for strategic cooperationcooperation agreement between Chinalco Guangxi Nonferrous Rare Earth Development Company and Xuzhou Jin Shi Pengyuan Rare Earth Material Factory.According to the agreement,both sides would jointly support Chinalco Guangxi Nonferrous Rare Earth Development Company and Xuzhou Jin Shi Pengyuan Rare Earth Material Factory to carry out comprehensive cooperation covering rare     

Aluminium Production by Province or City in 2014

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Fabricated Copper Production by Province or City in 2014

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Zinc Production by Province in 2014

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