铝土矿高压溶出过程中硅矿物的行为研究

选取高岭石和叶腊石作为实验原料,研究了高压溶出过程中温度、时间、苛性碱浓度以及CaO添加量对硅矿物反应行为的影响.研究表明:升高温度,延长反应时间,提高苛性碱浓度,加大CaO添加量均能提高硅矿物与铝酸钠溶液的反应率,且CaO的加入导致生成含SiO2的水化石榴石.     

从选矿拜耳法蒸发母液中排除碳酸钠的试验研究

为避免碳酸钠随母液循环积累给生产造成危害,对影响选矿拜耳法蒸发母液中碳酸钠溶解度的因素——母液中苛性碱浓度（以NazOx表示）和结晶排盐温度等进行了试验研究,确定了溶液中苛性碱浓度、溶液密度与碳酸钠溶解度的对应关系。结果表明,选矿拜耳法蒸发母液中碳酸钠的溶解度随母液中苛性碱浓度的提高而显著下降,母液中苛性碱浓度提高到约320g／L时,其w（Na2Oc）可降低到7％以下;温度的影响较小,在90-100℃条件下析出的碳酸钠晶体沉降效果较好。     

钒渣钠化焙烧过程的半定量分析

以碳酸钠为添加剂,对钒渣进行钠化焙烧试验研究,通过XRD半定量法检测产物中钒酸钠的质量含量,研究影响钒酸钠生成的因素,并通过SEM、TG等辅助方法对钒渣在碳酸钠存在下焙烧过程中的物相变化及相应温度进行研究。结果表明,钒渣在钠化焙烧过程中发生复杂的反应,主要包括橄榄石、尖晶石的氧化分解,以及钒酸盐、铬酸盐、硅酸盐、钛酸钠、铝酸钠、铁酸钠等的形成。产物中钒酸钠的质量分数随着V_2O_5、Na_2CO_3含量的增加而增加,在试验条件下,最优的反应温度是730℃,最优的反应时间是80 min,此时钒酸钠(Na4V2O7)在含钒物相中的含量可达98.09%,其它含钒物相主要是CrVO_3、CrVO_4以及FeVO_4。     

用钛白废酸浸出赤泥的试验研究

研究了用钛白废酸从赤泥中浸出钪、钒、钛、硅,考察了钛白废酸浓度、反应时间、反应温度、液固体积质量比对各元素浸出率的影响。结果表明:随废酸浓度提高,元素浸出率提高,但溶液过滤性能变差;最佳浸出条件为废酸浓度1.6mol/L,反应时间40min,反应温度80℃,液固体积质量比4.5∶1。最佳条件下,钪、钛、钒、硅浸出率分别为62.12%、50.85%、40.56%和66.46%,溶液过滤性能良好。     

钒酸钠水热法直接制备钒酸铋颜料

以钒渣亚熔盐法高效提钒工艺中间产物钒酸钠为钒原料,以硝酸铋为铋源,采用静态水热法得到了合格的钒酸铋颜料,其最佳反应条件为:前驱体溶液pH值7、n_(Bi)/n_V为1、反应温度大于100℃、反应时间6 h以上,所得钒酸铋为单斜晶型,色度和吸油度均达标。试验结果表明,无论以正钒酸钠、偏钒酸钠还是偏钒酸铵为钒原料,在相同反应条件下,均可以得到色度、吸油量合格的钒酸铋产品。因此,以成本更为低廉的钒酸钠作为原料制备钒酸铋,可极大提高产品的经济性。     

贵州某高硫铝土矿焙烧脱硫后的预脱硅和沉降性能研究

研究了贵州某高硫铝土矿焙烧后的预脱硅和矿浆沉降性能。结果表明:随焙烧时间延长和温度升高,预脱硅率升高;随矿浆固含量增加,预脱硅率降低;石灰添加量对预脱硅影响不大;随苛性碱质量浓度增大,预脱硅率升高;在苛性碱质量浓度248g/L、石灰添加量9%、反应时间8h、温度100℃、矿浆固含量300g/L适宜条件下,预脱硅率为64.5%左右;稀释矿浆苛性碱质量浓度为160g/L,矿浆沉降速度10m/h,矿浆固含量以70g/L为宜,絮凝剂添加量为80g/t左右。     

HRB500E钢中钒的析出行为研究

试验测定了钒在钢中的固溶和析出温度,研究了析出行为的热力学、动力学。结果表明,成分为C:0.25%,V:0.05%,N:0.011%钢中钒在1 040℃左右开始析出,V含量增加,V(C,N)开始析出温度升高,N含量增加,后期析出的VC_xN_(1-x)系数x越小;高温下以富氮形式析出,低温下以富碳形式析出。对比选择了位错线上的形核机制,简化为球形析出物的形核长大模型,以钒的传质为限制性环节,计算表明析出物的长大速率随钒界面浓度的增大而减小,随析出物半径的增大而减小。     

氯化胆碱-尿素-V_2O_5溶液黏度和电导率的研究

氯化胆碱-尿素(ChCl-urea)低共熔溶剂可很好地溶解某些金属氧化物,为金属氧化物的电化学还原制备金属单质提供了一条新的途径。系统测定不同温度与V_2O_5浓度下ChCl-urea低共熔型离子液体的黏度和电导率。结果表明,ChCl-urea-V_2O_5溶液的黏度随温度的升高而降低,随V_2O_5浓度的升高则逐渐增大;电导率随温度的升高而增大,V_2O_5浓度对溶液电导率有一定影响,但变化范围较小。选择较高的反应温度与合适的V_2O_5浓度有利于后续V~(5+)的还原和钒的提取。     

从炼油残渣中回收钒

将机械粉碎的石油燃烧残渣与高于接化学计算量的碳酸碱、硫酸碱、氯化碱或其混合物在高于930～970℃的氧化气氛中加热,用水或水和碳酸钠溶液浸渍所得的物料后获得钒酸钠溶液,从钒酸盐溶液中除去硅酸盐等杂质,再从净化的溶液中沉淀钒酸铝、粒状聚钒酸铝和偏钒酸铝。     

多钒酸铵的沉淀

钒渣是我国提钒的主要原料。用钒渣提钒的工艺过程是:钒渣加钠盐附加剂进行氧化钠化焙烧,烧成料用水浸出得钒酸钠溶液,再从钒酸钠溶液中沉淀析出钒。从钒酸钠溶液中沉淀析出钒,目前广为采用的有:五氧化二钒水解沉淀法、偏钒酸铵沉淀法和多钒酸铵沉淀法。五氧化二钒水解沉淀法是在酸性条件下(pH1.5—1.7)进行的沉淀方法;偏钒酸铵法是在碱性条件下(pH 8—9)进行的沉淀方法。这二种方法我厂均进行过长期的工     

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.