氯化铵分解氟碳铈矿回收稀土的研究

提出氯化铵焙烧法提取氟碳矿中稀土新的工艺路线,考究反应温度、,时间、氯化铵用量及固氟添加剂对稀土回收的影响,在焙烧温度５００℃,焙烧时间１小时,氯化铵／矿重＝０．５及固氟添加剂存在的条件下,稀土回收率达到８４％,同时氯化铵焙烧法对铁的氯化具有选择性,焙砂热水浸出得到的浸取液,铁的含量很低,因此采用该法分解氟碳铈矿更有利于后续过程的稀土净化。     

碳热氯化法分解包头混合稀土精矿提取稀土

研究包头氟碳铈-独居石混合稀土精矿的碳热氯化反应,考察反应时间、反应温度和脱氟剂对稀土提取率的影响.结果表明,包头氟碳铈-独居石混合稀土精矿的碳热氯化反应的较佳工艺条件为反应温度800℃,反应时间2h.在脱氟剂AlCl3存在下,800℃时氯化反应2h,稀土提取率高达98%.X射线衍射结果表明,在脱氟反应过程中,AlCl3和矿物分解产生的REOF发生了脱氟反应,使氟碳铈矿中的氟被转化为难溶于水的AlF3而留在滤渣中,同时AlCl3促进了独居石的分解反应.     

从包钢选矿厂尾矿中回收稀土的工艺研究

研究了包钢选矿厂尾矿经AlCl3或MgO脱氟后加碳氯化提取稀土的反应原理和工艺,考察了碳热氯化反应时间和脱氟剂对稀土提取率的影响。结果表明:700℃碳热氯化2h,在脱氟剂AlCl3存在下,稀土提取率可达77%;在脱氟剂MgO存在下,稀土提取率可达84%。     

稀土抛光粉

一种以氧化铈为主要成份用于提高制品或零件表面光洁度的混合轻稀土氧化物的粉末。通常以氟碳铺矿精矿(含RE2O3≥70％)或可溶性稀土盐类(含CeO2/RE2O3≥45％-50％的氯化稀土或含CeO2>80％的富铈稀土化合物)为原料，     

氯化铵焙烧法提取稀土工艺及应用基础研究

介绍了选择性氯化铵焙烧法提取稀土的热力学基础及处理四川攀西稀土矿的黑色风化矿泥、原矿、精矿、尾矿和山东微山中品位稀土精矿、白云鄂博中品位混合精矿的试验情况,文中介绍了二氧化铈和氧化镧的氯化过程及其机理研究结果。     

越南都巴奥强风化型稀土矿分选工艺

都巴奥氟碳酸铈镧矿(bastnaesite)矿床位于越南最北部的莱州(Lai Chau)区内。由于风化严重,氟碳酸铈镧矿与大量萤石和重晶石共生矿石难以处理。实验室和半工业试验结果表明,淋洗和分级技术是稀土矿加工处理过程中最关键的第一步。淋洗后的产物含氧化稀土30%,回收率为63%。由于这种低品位氟碳酸铈镧矿精矿具有特殊的性质,所以必须研究出了一种可以在工业上采用的新型冶金工艺过程。该工艺的特点是用硫酸作精矿的淋洗剂,在实际生产中借助一些转筒使精矿呈固体状态,这时温度仅为200—300℃。此外,该工艺还包括两个附加作业,其一是重晶石浮选,以生产用于钻井品级的重晶石,另外一个则是通过高梯度磁选生产出第二种稀土,产品含氧化稀土33%。两种氟碳酸铈镧矿精矿混合到一起留待进一步冶炼处理。     

甘肃某稀土矿石选矿试验研究

甘肃某稀土矿石REO含量为192%，主要稀土矿物羟硅钙铈石、直氟碳钙铈矿、氟碳钙铈矿的嵌布粒度较细，REO含量加权平均值为5488%，即稀土精矿的理论REO品位为5488%。为确定该矿石的开发利用工艺，进行了选矿试验研究。结果表明：强磁选和重选均不适合该矿石的预先抛尾；矿石采用粗磨—浮选—再磨—强磁选流程处理，可获得REO品位为2389%、回收率6470%的稀土精矿，稀土次精矿REO品位为532%、回收率1162%，稀土总回收率为7632%。该稀土精矿品位不高，后续需进一步开展提质降杂试验.     

刚果(金)某硫化铜钴精矿沸腾焙烧试验研究

针对刚果(金)某铜钴矿选矿所得硫化铜钴精矿进行了沸腾焙烧试验研究。研究表明, 在焙烧温度620 ℃、空气线速度043 m/s、风矿比3.33 m3/kg的条件下, 硫化铜钴精矿焙烧效果较好。焙砂和焙烧烟尘酸浸试验结果进一步验证了最佳焙烧条件, 焙砂铜、钴、铁浸出率分别为96.43%, 87.06%和10.89%, 焙烧烟尘铜、钴、铁浸出率分别为96.32%, 84.02%和17.12%。试验研究结果为该类型铜钴矿选冶联合工艺选择及后期工业化应用提供了实验数据与技术支持。     

四川冕宁稀土精矿中钍的赋存状态及分布规律研究

利用扫描电镜背散射电子成像技术,微区能谱分析,自动矿物分析软件,对四川冕宁稀土精矿中钍的赋存状态及其分布规律进行了研究。结果发现稀土精矿中存在钍的独立矿物(钍石、铀钍石、铅钍石等),且27.28%的ThO_2存在于钍的独立矿物中,52.46%的ThO_2主要以类质同象形式赋存于稀土矿物(氟碳酸盐矿物、硅酸盐矿物、磷酸盐矿物)中,氟碳酸盐矿物主要为氟碳铈矿、氟碳钙铈矿,硅酸盐矿物主要为硅钛铈矿,二者矿物中ThO_2的平均含量相对较低,磷酸盐矿物主要为独居石,其ThO_2的平均含量明显高于氟碳酸盐矿物和硅酸盐矿物,个别独居石中ThO_2含量高达5.91%;此次研究可为今后充分合理回收稀土精矿中的钍资源提供一定的依据。     

白云鄂博氟碳铈矿-独居石混合精矿中非稀土元素的氯化反应

研究了白云鄂博氟碳铈矿-独居石混合精矿中非稀土元素的等温碳热氯化反应以及反应过程中物理状态的变化。当反应温度低至500℃、活性炭为还原剂、SiCl4+Cl2的气氛下氟碳铈-独居石混合精矿中非稀土元素Ca、Ba、Mg基本反应完全并和稀土元素的氯化产物共同存在于氯化产物水溶液中,Th的氯化产物主要存在于氯化产物的水不溶物中,小于1%的ThCl4在反应过程中挥发,沉积在450℃的温区,精矿中Fe的氯化产物沉积在300℃～150℃的温区,P的氯化产物主要沉积在低于150℃的温区内。通过水溶氯化反应产物可实现少量的没有氯化的物质和氯化物之间的分离以及Fe、P、Th的分离。     

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.