氯化法分解氟碳铈精矿提取稀土的研究

研究了氟碳铈精矿经预脱氟后加氯化铵焙烧分解,再用热水浸取焙砂从而制氯化稀土的新工艺。系统考察了脱氟剂、反应温度、氯化剂用量、氯化时间因素对氟碳铈精矿稀土提取率的影响,并对工艺进行了优化;当在５００℃下添加相当于矿重３０％的脱氟剂脱去氟后,再在４８０℃下加入相当于矿重２倍的氯化铵焙烧１．５ｈ,焙砂用热水浸取得到氯化稀土溶液,稀土提取率可以达８０％以上,浸出液中Ｆｅ、Ａｌ、Ｓｉ等非稀土杂质含量很低。     

固固转化法高效制备氯化稀土的工艺研究

采用固固转化法, 使用碳酸氢铵溶液对硫酸稀土焙烧矿进行直接转型, 得到氯化稀土。重点考察了碳酸氢铵用量、焙烧矿粒度、反应固液比、转化时间等因素对稀土收率的影响, 确定了最优工艺条件:硫酸稀土焙烧矿粒度为0.18 mm, 碳酸氢铵加入量为焙烧矿质量的60%, 固液比1∶6, 转化时间7 h, 酸溶时间1 h, 此条件下稀土收率可达到93%以上, 同时工艺用水量减少了50%, 生产效率更高, 为节能减排开辟了新途径。     

钕铁硼废料中稀土的回收

采用焙烧-盐酸浸出工艺回收钕铁硼废料中的稀土。以钕铁硼废料为原料,研究焙烧温度、焙烧时间对废料中铁氧化率的影响;以钕铁硼废料焙烧料为原料回收其中稀土元素,研究了盐酸浓度、浸出时间、浸出温度以及固液比对稀土浸出率的影响。实验结果表明,钕铁硼废料的最佳焙烧条件为: 焙烧温度700 ℃、焙烧时间1.5 h,此时铁氧化率可达99.30%;盐酸浸出焙烧料的最佳条件为: 盐酸浓度4 mol/L、液固比3∶1、浸出温度90 ℃、浸出时间1.5 h,此时稀土浸出率可达98.11%。     

微波作用下温度对白云鄂博稀土铁矿固氟效率的影响

针对白云鄂博稀土铁矿在“选冶”过程中的固氟问题,以白云鄂博稀土铁矿为原料,通过XRD、化学检测、单因素实验以及红外光谱拟合分析法,研究了在微波作用下碳酸氢钠在不同温度下的固氟效果。实验结果表明最佳固氟温度条件为： 973.1K,在碳酸氢钠占比40%、焙烧恒温时间60min时可获得固氟率最高为83.49%；利用傅里叶红外光谱以及二阶导光谱法定量分析焙烧固氟矿物,结果表明：随焙烧温度的升高,氟化钠的吸收峰峰峰面积呈现递增趋势,温度873.1K、973.1 K分别与773.1 K相比增加了109.27%、120.16%,在973.1K焙烧温度下的氟化物含量较多且有稳定的红外吸收峰；同时,加入钠剂的固氟宏观反应过程符合Avrami-Erofeev动力学模型,属于随机成核及随后生长的化学反应控制,表观活化能为58.19 KJ/mol。该实验结论,对于开发白云鄂博稀土铁矿绿色回收工艺,具有参考研究价值。     

选择性氯化提取攀西稀土矿脱锰矿泥中稀土

采用氯化铵焙烧法处理攀西稀土矿脱锰矿泥 ,通过正交试验设计 ,对焙烧反应温度、反应时间、氯化铵用量进行了优化 ;确定了最佳焙烧条件为 :反应温度 40 0℃ ,氯化铵用量NH4 Cl/脱锰矿泥 =0 30 ,反应时间为 6 0min ;其稀土浸取率达到 83 2 9% ;中间实验得到稀土浸出率为 80 %。进一步采用N2 3 5对该稀土浸出液萃取净化除铁、P50 7萃取提取稀土后 ,最后得到了稀土相对纯度为 96 3 %的混合稀土氯化物     

伊利石型含钒石煤无添加剂焙烧-酸浸提钒工艺研究

以陕西商洛某伊利石型石煤钒矿为原料,采用无添加剂焙烧-酸浸法从石煤中提取钒,分析了焙烧温度、焙烧时间及浸出温度、硫酸浓度、浸出时间、液固比对钒浸出率的影响。结果表明,焙烧温度对钒的浸出率有显著影响,焙烧温度过低和过高,钒都难以被浸出,只有在适当焙烧温度范围内,钒的浸出效果较好。以850℃条件下焙烧2h后的石煤焙烧料,在硫酸浓度5%、浸出温度90℃、浸出时间1h、液固比4∶1mL/g的条件下,钒浸出率达72.53%,表明伊利石型含钒石煤采取无添加剂焙烧提钒是可行的。浸渣样品的SEM分析结果表明,石煤焙烧过程中生成的钒包裹体和部分未从伊利石中释放的钒是造成钒损失的主要原因。     

锂云母矿硫酸盐焙烧-水浸提锂工艺及机理

这是一篇冶金工程领域的文章。以江西某地锂云母矿为原料，通过对焙烧-浸出、拌酸熟化、直接酸浸出、碱压煮法等工艺进行探索实验，最终采用加硫酸盐焙烧-水浸法从锂云母矿中提锂。同时研究了焙烧温度、焙烧时间、添加剂种类、添加剂用量、浸出液固比、浸出温度等条件对锂浸出率影响，结果显示，焙烧温度对锂浸出率影响较大，在适当的焙烧温度范围内，锂的浸出效果较好。向锂云母矿中加入40%硫酸钾、20%硫酸钠、20%氧化钙，在900℃下焙烧1 h，焙砂按液固比1∶1在常温下浸出1 h，锂浸出率可达94.87%。这说明采用硫酸盐作添加剂来焙烧提锂效果较好，通过研究焙烧机理可知，加入硫酸盐经高温焙烧后，矿物结构被重构，矿中钠钾离子与锂云母中的锂离子置换，使其从难溶性铝硅酸盐矿物中分离，生成可溶性的硫酸锂，从而经水浸后进入溶液中。     

冷却方式对焙烧矿中氧化亚铁含量的影响研究

针对难选氧化铁矿磁化焙烧矿中氧化亚铁含量差距较大的问题,进行了不同冷却条件对焙烧矿中的氧化亚铁含量影响的研究。在相同焙烧温度及焙烧时间条件下,试验获得的不同冷却方式下焙烧矿中氧化铁含量的平均值为:水中冷却11.52%自然冷却11.00%空气中冷却5.60%。试验表明:冷却气氛是影响焙烧矿中氧化亚铁含量的直接原因;焙烧矿冷却过程中,还原气氛使焙烧矿进一步被还原增加氧化亚铁含量或保持不变,氧化气氛使磁铁矿再一次被氧化降低焙烧矿中的氧化亚铁含量。     

硫酸铵焙烧铝土矿提取氧化铝

以三水铝石矿、硫酸铵为原料,采用硫酸铵两段焙烧法提取铝土矿中的铝和铁,通过单因素试验研究了常压条件下硫酸铵焙烧铝土矿过程中低温段、高温段焙烧温度、低温段、高温段焙烧时间、铵矿比对铝土矿中氧化铝和氧化铁的提取率的影响.结果表明,粒度小于74 μm的铝土矿在铵矿比n=4,低温段焙烧温度300℃,焙烧时间60 min,高温段焙烧温度450℃,焙烧时间60 min的条件下,多次验证Al2O3的提取率均在98％以上,Fe2O3的提取率均在88％以上.使铝土矿中的铝、铁、硅得到了有效地分离.     

硫酸铵焙烧铝土矿提取氧化铝及氧化铁

以三水铝石矿、硫酸铵为原料,采用硫酸铵两段焙烧法提取铝土矿中的铝和铁,通过单因素试验研究了常压条件下硫酸铵焙烧铝土矿过程中低温段、高温段焙烧温度、低温段、高温段焙烧时间、铵矿比对铝土矿中氧化铝和氧化铁的提取率的影响。结果表明,粒度小于74μm的铝土矿在铵矿比n=4,低温段焙烧温度300℃,焙烧时间60 min,高温段焙烧温度450℃,焙烧时间60 min的条件下,多次验证Al2O3的提取率均在98%以上,Fe2O3的提取率均在88%以上。使铝土矿中的铝、铁、硅得到了有效地分离。     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

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     

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     

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     

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.     

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.     

2014 second batch of rare earth quota released

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