含钒石煤微波焙烧提钒试验研究

以某含钒石煤为原料进行微波焙烧提钒研究,并与常规焙烧提钒进行对比,主要考察微波焙烧温度、微波焙烧时间、硫酸体积浓度、浸出时间、液固比、浸出温度对钒浸出率的影响。结果表明,在微波焙烧温度550℃、焙烧时间20min、硫酸体积浓度15%、浸出时间6h、液固比1.5∶1(mL/g)、浸出温度95℃的条件下,钒浸出率为86.64%,在相同浸出条件下,常规马弗炉700℃焙烧1h钒的浸出率为84.22%。微波焙烧相对常规焙烧能在更低温度、更短时间内达到相同的提钒效果。     

微波焙烧对石煤钒矿浸出的影响

研究了微波焙烧预处理石煤钒矿,考察了微波功率、微波焙烧时间等因素对钒浸出率的影响。结果表明,微波焙烧预处理钒矿石12min,然后在搅拌条件下用硫酸浸出2h,钒浸出率达69.04%,与相同浸出时间内未焙烧矿样相比,提高了近20%。微波焙烧预处理后浸出效率明显提高,浸出时间缩短50%以上,而且能耗和污染也大幅度降低。     

微波加热低品位稀土精矿酸浸实验研究

针对稀土精矿高温酸浸焙烧钍难回收、成本高而低温酸浸焙烧又效率低的问题,采用"微波加热低温酸浸"新工艺,研究了低品位稀土精矿硫酸焙烧浸出的过程。实验首先考察了微波加热稀土精矿硫酸焙烧的升温特性,重点探讨了微波加热的焙烧温度、酸矿比、焙烧时间对酸浸矿稀土浸出率的影响,同时考察了不同焙烧温度下水浸渣中钍的残留率。实验结果表明:稀土精矿微波酸浸焙烧的升温速率随着酸矿比和微波功率的增加而加快;而且随着温度的升高、酸矿比和焙烧时间的增加,微波加热酸浸稀土精矿的浸出率提高,其浸出的最佳条件为:焙烧温度220℃,酸矿比1.5,焙烧时间8 min;此条件下的稀土浸出率为92.55%,且水浸渣中的钍未生成焦磷酸钍,可用于下一步提取。与现行的稀土精矿硫酸高温焙烧生产工艺和常规的低温酸浸焙烧工艺相比,微波焙烧低温酸浸工艺更具优势,在保证稀土较高浸出率和后续工艺能回收钍的基础上,将焙烧时间缩短为常规低温酸浸工艺浸出时间的1/15,从而提高了浸出效率。     

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。     

微波焙烧—酸浸对石煤钒矿提钒的影响

研究了以石煤为原料,加入复合添加剂Na2CO3和K2CO3,经微波焙烧、硫酸浸出钒。石煤中混入30%复合添加剂(m(Na2CO3)∶m(K2CO3)=7∶3),于微波750℃下焙烧4 h,90℃下酸浸7 h,控制液固体积质量比2∶1,钒浸出率达95%。与传统的钠化氧化焙烧法相比,钒浸出率较高,而且大大降低了对环境的污染。     

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%。     

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℃。     

高铬钒渣空白焙烧超声波辅助浸出钒铬试验研究

以高铬钒渣无盐空白焙烧获得的焙烧熟料为原料,通过超声波辅助浸出研究其中钒与铬的浸出行为,并得出较优的工艺参数组合。具体研究了超声功率、浸出介质浓度、液固比、浸出温度和浸出时间对钒铬浸出行为的影响。结果表明,超声功率为560 W,浸出介质浓度为10%,液固比为7,浸出温度为60℃和浸出时间为20 min时,钒浸出率达到最大值,同时,铬浸出率最小,实现了钒的高效提取与钒铬分离。对钒浸出率来说,超声波功率对钒浸出率影响最大,其次是液固比,酸浓度和浸出时间,浸出温度对钒浸出率影响最小。对铬浸出率来说,空白焙烧超声波辅助浸出下铬浸出率均小于1%,超声波功率对钒浸出率影响最小,而酸浓度对铬浸出率影响最大。     

钙化焙烧-微波酸浸对钢渣中钒铁浸出的影响

为研究含钒钢渣钙化焙烧参数对提钒效率的影响，以来自河北承德的含钒钢渣为原料、CaO为焙烧添加剂，利用微波设备加热酸浸，考察了焙烧温度、时间及配钙比对V、Fe元素浸出的影响规律，并揭示了其作用机制。热力学计算表明，在700～1 100℃范围内，尖晶石相已经氧化分解。试验结果表明，在不同的焙烧温度下，V元素的浸出率从36.96%提高到40.56%;当延长焙烧时间至5 h后，浸出率反而下降，这是因为随着长时间的氧化焙烧，生成了难溶解的硅酸盐相；当焙烧温度为1 000℃、时间为3 h、配钙比为8%时，V元素的浸出率最高可达50.06%,同条件下Fe元素的溶出率为19.89%。试验不仅有效回收了钒资源，而且抑制了杂质元素的溶出。     

石煤分级微波焙烧对提钒过程的影响研究

以湖北某低品级云母型石煤钒矿为对象,首先研究了0~3 mm未分级石煤的微波焙烧对石煤提钒过程的影响。研究发现,全粒级微波焙烧过程中易产生严重的烧结现象,在H2SO4体积分数为15%,液固比为1.5∶1.0(ml·g-1),浸出温度为95℃,搅拌浸出6 h,钒浸出率仅为58%。为改善焙烧过程中出现的烧结现象,考查0~0.3 mm,0.3~1.0 mm,1~2 mm和2~3 mm 4个不同粒级石煤的微波焙烧效果。结果表明,0~0.3 mm的细粒级部分烧结现象依然严重,而其他粗粒级部分的烧结现象得到很大改善;分级焙烧后,各个粒级的浸出率均高于未分级部分,其中1~2 mm粒级的石煤900℃下焙烧30 mim,钒浸出率可达到81%。对于该石煤钒矿的0~3 mm全粒级石煤,由于其严重的烧结现象以及较低的浸出率不适合直接进行微波焙烧;应先对全粒级石煤进行分级处理,分离出其中0~0.3 mm部分进行单独处理,而微波焙烧此类石煤的合适粒级为1~2 mm。     

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.