拜耳法赤泥中铝铁的盐酸浸出过程研究

分析了拜耳法赤泥的矿物组成,通过热力学计算讨论了赤泥与盐酸反应可行性。通过正交试验得出了盐酸浸出赤泥的最佳条件。结果表明:对铝、铁浸出率显著性影响顺序分别为盐酸浓度温度液固比反应时间,盐酸浓度液固比温度反应时间;最佳条件为:盐酸浓度6 mol/L,温度110℃,液固比6:1,反应时间90 min;在最佳条件下,铝铁浸出率分别为83%和84%。浸出反应符合未反应收缩核模型的化学反应控制过程,铝、铁的浸出活化能分别为45.17 KJ/mol,22.35 KJ/mol。     

粉煤灰烧结料盐酸浸出铝铁工艺研究

对粉煤灰烧结料盐酸浸出提取铝铁的条件进行研究,分别采用正交试验与单因素试验考察了浸出温度、浸出时间、浸出酸浓度、液固比对烧结料中铝、铁的酸浸率的影响.结果表明,最佳浸出工艺条件为:在浸出温度为100"C、浸出时间为2h、浸出酸浓度6mol/L、液固比为4:1时,粉煤灰铝铁浸出率可达到96.92%.表明该工艺从粉煤灰烧结料中提取铝铁具有较好的效果.     

油页岩脱油残渣制备聚合氯化铝铁絮凝剂的试验研究

以油页岩脱油残渣为原料,采用酸浸、水解、聚合、熟化等工艺过程,制备聚合氯化铝铁(PAFC)絮凝剂产品。重点对制备PAFC絮凝剂的酸浸工艺参数进行研究,其最佳工艺条件:活化温度850℃、盐酸浓度20.2%、酸浸温度110℃、酸浸时间2.0h、液固比4∶1,氧化铝浸出率90.6%,氧化铁的浸出率91.7%。利用红外光谱分析技术对PAFC进行了结构表征及PAFC絮凝性能试验,结果表明,在相同条件下PAFC的絮凝效果明显好于聚合氯化铝(PAC),用油页岩脱油残渣制备PAFC絮凝剂产品是可行的。     

赤泥中硫酸选择性浸出铁、钪及动力学研究

以硫酸为浸出剂,进行了酸浸初步分离铁、钪的研究,考察了反应时间、反应温度、液固比、硫酸浓度等对浸出率的影响。结果表明,在40 ℃、液固比10∶1、硫酸浓度10 mol/L条件下浸出30 min,铁、钪浸出率分别为11.32%、58.41%。酸浸铁、钪的动力学研究结果表明,赤泥酸浸铁的过程符合未反应收缩核模型,受化学反应控制,其表观活化能为41.79 kJ/mol;而赤泥酸浸钪的过程符合多相液固区域反应动力学特征,受扩散控制,其表观活化能为6.72 kJ/mol。     

影响煤矸石中氧化铝浸出效果的因素探索

为了提高鸡西矿区煤矸石中氧化铝的浸出效果,在对煤矸石活化处理的基础上,采用硫酸溶液对其进行酸浸处理,探索不同因素对煤矸石中氧化铝浸出效果的影响规律,并确定氧化铝的最佳浸出条件。试验结果表明:硫酸浓度、酸浸温度、酸浸时间、液固比均对氧化铝的浸出效果有影响,在液固比为2∶1、硫酸浓度为80%、酸浸温度为120℃、酸浸时间为2.50 h的条件下,氧化铝的浸出效果最好,浸取率为37.11%。     

盐酸浸取高岭土中氧化铝的研究

对盐酸浸取高岭土中氧化铝进行了研究。考察了煅烧温度、盐酸浓度、盐酸用量、酸浸时间及加入反应剂焙烧等因素对氧化铝浸出率的影响 ;研究发现在煅烧温度为 70 0℃ ,盐酸浓度为30 % ,盐酸与氧化铝 mol比为 6 ,酸浸时间为 2 h时 ,试样中的氧化铝浸出率达到 89% ,加入反应剂焙烧可减少酸浸时间 ;为利用高岭土生产铝盐制品 ,提高原料的利用率提供了依据     

铝土矿浮选尾矿盐酸浸出除铁工艺研究

铝土矿浮选尾矿含铁量较高, 不能直接作为电热法生产一次铝硅合金的原料。采用盐酸对铝土矿浮选尾矿进行了除铁。考察了浸出时间、浸出温度、浸出液固比及盐酸浓度对尾矿氧化铁和氧化铝浸出率的影响。实验结果表明, 在浸出温度80 ℃、浸出时间120 min、浸出液固比5∶1、盐酸浓度21%的条件下, 尾矿的除铁率可达95%以上, 氧化铝的损失率在4.3%以下。     

硫酸浸出法提取铝土矿中氧化铝的研究

对硫酸浸取铝土矿中氧化铝进行了研究,并考察了硫酸浓度、酸浸温度、酸浸时间、液固比、原料粒度对氧化铝浸出率的影响。结果表明,当硫酸浓度90%、温度220℃、时间1h、液固比5∶1、粒度小于141μm时,氧化铝的浸出率可达85%以上。     

脱除黄陵煤泥中铝和铁元素的实验研究

为有效提高黄陵煤泥的硅铝比,并降低铁含量,研究了用盐酸从煤泥中浸出铝和铁的最佳工艺条件。首先根据黄陵煤泥的化学与物相组成特点,确立了煅烧活化,利用盐酸脱出铝铁的基本技术路线。通过单因素实验确定了煅烧和酸浸反应的最佳工艺条件为：煅烧温度800℃,煅烧时间2 h,酸浸盐酸浓度6 mol/L,液固比10∶1（mL/g）,酸浸温度100℃。经最佳条件反应后,铝和铁浸出率分别为83.06%和90.20%,泥渣中SiO2含量由52.58%提高到73.32%,Al2O3含量由19.67%降低到8.49%,Fe2O3含量由5.99%降低到1.06%,SiO2与Al2O3摩尔比由4.87提高到15.73。     

太平洋中部深海粘土中稀土钇的酸浸研究

对深海粘土中稀土元素钇的酸浸过程进行了探讨, 考察了酸种类、酸浓度、液固比、浸出时间、浸出温度等因素对深海粘土中稀土元素钇浸出的影响。结果表明: 盐酸与硝酸浸出效果相近, 均明显优于硫酸;最佳浸出条件为: 盐酸浓度2 mol/L、液固比4∶1、温度60 ℃、浸出时间60 min, 此时钇浸出率可达94.53%。     

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     

2014 second batch of rare earth quota released

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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.