含氟助浸剂对石煤酸浸提钒的影响

以湖北某地经空白焙烧的石煤为对象,研究了含氟助浸剂A对酸浸提钒过程的影响。结果表明,含氟助浸剂中的F-能促进白云母晶体结构中Si-O键及Al-O键的断裂、破坏云母结构、疏通含钒矿物的孔洞,为酸与石英、长石等含硅铝的矿物发生反应提供便利,表现在热力学上就是与白云母发生反应的ΔG降低;宏观上表现为钒浸出率显著提高,试验确定的最佳条件下的钒浸出率为85.37%,比硫酸直接浸钒高28.04个百分点。     

湘西石煤中钒的氧化浸出动力学

在石煤提钒酸浸过程中加入助浸剂硝酸钠,研究了石煤氧化浸出机理。单因素和正交试验结果表明,在浸出温度95 ℃、固液比1∶2、硫酸用量27%、浸出时间11 h、搅拌速度600 r/min、硝酸钠用量1%时,钒浸出率为93.04%。直接酸浸和氧化酸浸动力学研究表明,直接酸浸过程钒浸出属于化学反应控制,表观活化能为70.41 kJ/mol;氧化酸浸过程钒浸出属于化学反应控制,表观活化能为47.43 kJ/mol。氧化酸浸可以降低活化能,有利于石煤中钒的浸出。     

低品位含钒石煤酸浸提钒工艺研究

在我国,含钒品位低于0.8%的石煤不但超过总量的60%,而且在高品位的矿山中也总夹杂着低品位的矿层或者矿带。为此,选取了贵州某地品位为0.60%的石煤为原料,采用硫酸+助浸剂R1+氧化剂R2体系进行了酸浸提钒试验研究。结果发现,该低品位石煤在一定条件下浸出率可达90%,并且在当前的市场条件下具有一定的经济价值。     

提高云南某石煤钒矿酸法提钒浸出率的研究

云南某石煤钒矿中的钒主要以类质同象形式赋存于硅酸盐矿物中,直接硫酸法处理浸出率仅为60.9%.试验表明,使用助浸剂可强化酸浸过程中对矿石结构的破坏,提高钒的浸出率.在硫酸用量为250kg/t、液固比1∶1、助浸剂A为25kg/t、助浸剂B为3kg/t、浸出温度90℃、浸出时间12h的条件下,钒的浸出率可达81.91%.与直接硫酸法相比,钒的浸出率提高20%以上.     

复合型助浸剂对钒浸出率的影响

从难处理的云母类石煤中提钒,只使用硫酸浸出钒,浸出率较低.在酸浸液中添加助浸剂A或B有助于提高钒的浸出率;添加复合型助浸剂AB可大幅提高钒的浸出率,钒浸出率可达83.96％.这种高效浸钒新技术已在国内一些提钒企业得到应用,并获得良好的经济效益.     

助浸剂CX对石煤酸浸提钒效果的影响

以湖北某地含钒石煤为研究对象,对采用硫酸直接酸浸和添加助浸剂CX的硫酸酸浸模式进行了详细的对比研究。试验结果表明,助浸剂CX的加入可明显改善钒的浸出效果,缩短反应时间2 h,降低反应温度、H₂SO₄的用量和反应成本;在CX用量为原矿质量的5%、硫酸浓度为20%、浸出温度为90 ℃、浸出时间为4 h情况下,钒的浸出率可达90%,比不加助浸剂的情况下高出18.74个百分点。     

以氟化钙为助浸剂的某伊利石型含钒石煤酸浸提钒工艺

以陕西某伊利石型石煤钒矿为研究对象,采用硫酸+氟化钙体系直接浸出工艺提钒,考察了硫酸浓度、浸出温度、氟化钙用量、液固比及浸出时间等工艺参数对钒浸出率的影响。试验结果表明,在氟化钙用量为原矿用量的10%、硫酸体积浓度5%、浸出温度90℃、浸出时间5 h、液固比4:1的条件下,钒的浸出率可达91.85%。这表明对伊利石型含钒石煤采用添加氟化钙作为助浸剂进行直接酸浸工艺提钒是有效的。     

以氟化钙为助浸剂的某伊利石型含钒石煤提钒工艺

以陕西某伊利石型石煤钒矿为研究对象,采用硫酸+氟化钙体系直接浸出工艺提钒,考察了硫酸浓度、浸出温度、氟化钙用量、液固比及浸出时间等工艺参数对钒浸出率的影响。试验结果表明,在氟化钙用量为原矿用量的10%、硫酸体积浓度5%、浸出温度90℃、浸出时间5 h、液固比4:1的条件下,钒的浸出率可达91.85%。这表明对伊利石型含钒石煤采用添加氟化钙作为助浸剂进行直接酸浸工艺提钒是有效的。     

助浸剂对攀钢钒尾渣酸浸提钒的影响

以攀钢钒渣提钒尾渣为原料,采用硫酸+助浸剂体系进行了浸出提钒试验研究。结果表明：硫酸和助浸剂C混合浸出可以更好地打开对钒的包裹,促进H+的反应和钒的浸出,在助浸剂C用量4%,硫酸体积浓度15%,液固比1.5 mL/g,浸出温度90 ℃、浸出时间2 h条件下,钒的浸出率可达73%,跟直接酸浸相比,钒浸出率提高了18个百分点,达到了较理想的浸出效果。     

助浸剂对钒矿浸出影响的试验研究

研究了助浸剂对某矿山钒矿直接酸浸的影响。试验结果表明,添加5%HJZ-1#、5%HJZ-2#混合添加剂,钒的浸出率可从47.58%提高到85.31%。钒矿浸出渣工艺矿物学研究表明,助浸剂的加入有利于难溶硅酸盐包裹中钒的浸出,从而提高钒的浸出率。     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.