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重庆地区煤系高硫稀有金属复合矿含有稀土、铌等稀有金属元素,矿样中部分稀土呈离子吸附形态存在,为一种新类型的高硫稀有金属复合矿资源。试验采用铵盐为浸出剂,考察了铵盐种类、浸出方式及浸出条件对稀土浸出情况的影响。试验结果表明,分别以硫酸铵、氯化铵、硝酸铵、乙酸铵、柠檬酸铵为浸出剂浸出矿样,稀土浸出率为31.96%~34.60%。以氯化铵为浸出剂浸出复合矿,稀土浸出率为34.60%,略高于其他铵盐浸出剂。从铵盐价格、稀土浸出率的高低、浸出时对杂质钙的抑制能力多方面综合考虑,选择硫酸铵为浸出剂较为适宜。以硫酸铵为浸出剂,分别对矿样进行了搅拌浸出、池浸、渗滤浸出试验研究。搅拌浸出、池浸、渗滤浸出的离子型稀土浸出率分别为91.88%、80.50%、88.70%,获得了较高的离子型稀土浸出率。 相似文献
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采用盐酸直接浸出方式从稀土废抛光粉中回收稀土,考察了盐酸浓度、浸出温度、浸出时间和液固比对稀土和主要杂质元素Al2O3浸出率的影响,并探讨了浸出机理。结果表明,HCl体系单级浸出的优化条件为:HCl浓度8 mol/L、浸出温度80℃、浸出时间3 h、液固比4∶1,此时稀土元素浸出率为90.81%,Al2O3浸出率为43.68%。对比了单级浸出、二级浸出和三级逆流浸出效果,证实三级逆流浸出时稀土浸出率高达98.38%,浸出液中稀土总量增加,有利于稀土元素的下一步萃取回收,大大降低了回收成本。 相似文献
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提出了一种从风化壳淋积型稀土矿除杂渣中分步浸出回收稀土和铝的工艺。在40 ℃、液固比10∶1条件下用8 mol/L NaOH浸出除杂渣,铝浸出率约为96%,而稀土仍保留在滤渣中。再在40 ℃、液固比10∶1条件下用1 mol/L HCl浸出碱浸后的滤渣,稀土La和Y浸出率分别达87.09%和72.01%。酸浸液经草酸沉淀得草酸稀土,滤液与碱浸液混合得氢氧化铝,稀土和铝总回收率分别为78%和97%。该工艺对资源利用和环境保护具有重要意义。 相似文献
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含稀土磷精矿中RE_2O_3浸出工艺研究 总被引:1,自引:0,他引:1
针对贵州某含稀土磷精矿,研究了影响稀土浸出的主要因素,得到的浸出工艺条件为:磷酸浓度为23%,硫酸化学计量比1.1,温度75℃,浸出时间1 h,液固比4∶1,在此浸出工艺条件下,RE2O3浸出率为65.59%。 相似文献
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CHEN Zhanheng 《中国稀土信息(英文版)》2018,(10)
正1. The development of rare earth resources outside China With the promotion of domestic rectification on rare earth industry and cracking down on illegal rare earth production, illegal rare earth mining has been restrained to some extent. The current rare earth industry policies, especially the total volume control policy and the management on rare earth exploration and mining rights, stimulate the development of rare earth projects outside China. 相似文献
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我国重庆某煤系高硫稀有金属复合矿中含硫(铁)、铝、稀土等多种有价成分,且部分稀土呈离子吸附形态存在。对该矿铵盐浸出液除铝、铁杂质后得到的低浓度稀土溶液,进行了稀土的萃取、反萃取、制备碳酸稀土试验的研究。确定的工艺条件为:有机相组成10%P507+90%260~#磺化煤油、净化液初始pH值为5.5、相比(O/A)0.6、搅拌时间5 min。单级萃取,稀土萃取率为92.79%,两级逆流萃取,稀土萃取率可达99.07%;负载有机相采以稀硫酸三级逆流反萃,稀土反萃率为97.20%,反萃液中TREO可富集至2175 mg/L;稀土与钙、镁等杂质得到了有效分离;反萃液经除锌后,与碳酸氢铵反应,制得的碳酸稀土产品质量符合要求;从净化液到产品,稀土回收率达87.85%;萃余液和碳酸稀土合成母液经处理后可用于循环浸出煤系高硫稀有金属复合矿。 相似文献
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《中国稀土信息(英文版)》2015,(9)
<正>September 1-10,2015Rare earth market kept stagnant recently.Price of rare earth had touched the lowest level in recent two years.There was no room for further declining.However,rebound of rare earth was determined by the relationship between supply and demand.Although September was the busy season conventionally,most separation plants showed no intention to recover production.As the exchange rate of Renminbi fell recently, 相似文献
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《中国稀土信息(英文版)》2015,(6)
<正>June 1~10,2015Affected by the sluggish downstream demand,rare earth market in China was inactive.Prices of most rare earth products kept dropping,such as didymium oxide and didymium alloy.The weak demand from NdFeB magnet industry constrained the price of dysprosium and related products.The prices continued to fall down.Terbium oxide market was not active and so did the lanthanum oxide market and cerium oxide market.There were few transactions in rare earth export market for most international buyers took the wait-and-see approach for further market trend. 相似文献
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《中国稀土信息(英文版)》2015,(8)
<正>August 10~20,2015China rare earth market remained stagnant recently.Demand from NdFeB magnetic industry was weak,which led to the constant price falling of didymium,dysprosium and terbium related products.Depressed phosphor industry lowered the price of europium and yttrium.The market of lanthanum and cerium was flat.Export market of rare earths remained inactive as well. 相似文献
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《中国稀土信息(英文版)》2018,(12)
正Source:Roskill Japanese demand for rare earths rose by 7%to 18,816t REO in 2017, the fourth consecutive annual increase. Demand for lanthanum rose by 6%to 2,090t, reflecting higher use in ferrite magnets and FCC catalysts. The 11%increase in demand for cerium (to 6,450t) was due to strong demand in autocatalysts and glass polishing materials. Japanese autocatalyst production rose by 14%to 11,325t in 2017. 相似文献
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《中国稀土信息(英文版)》2016,(1)
正1.General situation of rare earth market2015 is the last year of the"twelfth-five year"and also the key year to,comprehensively deepen reform.A great progress has been made in China's economic system reform during the period.From the point of economic operation,China's industrial economy made a steady progress.Added value of high-tech industry increased by 10.4%during the first three quarters,4.2%higher than the overall industrial growth rate. 相似文献