高铝稀土料液萃取除铝工艺的研究

以环烷酸为萃取剂,分别采用先皂化和不皂化的方式对高铝稀土料液进行萃取除铝.结果表明,环烷酸对铝有较好的选择性,经过一级萃取,稀土料液中的铝含量低于20mg/L,而稀土萃取率低于10%,采用盐酸反萃进入环烷酸的稀土,再用草酸沉淀,稀土的收率大于99%.     

从稀土废水中回收制备氧化稀土试验研究

稀土冶炼废水中含有一定浓度的稀土元素,如不加以回收,会造成稀土资源的浪费。为使回收稀土废水中的稀土,试验采用化学沉淀-萃取反萃-草酸精制的工艺回收废水中的稀土。化学沉淀试验表明,以氢氧化钠为沉淀剂,废水中稀土的沉淀率可达97.51%;沉淀经酸溶,水解除铁后进行稀土萃取试验,萃取级数2级,稀土元素的萃取率为97.33%;萃取后的稀土富集有机相经3级反萃,草酸精制后获得氧化稀土产物。整个工艺流程中稀土总回收率为90.93%。      

高铝铁含量的低浓度稀土溶液利用研究

对西南某地含有少量稀土元素的高硫低品位稀有金属复合矿,采用硫酸铵溶液渗滤浸出获得了TREO含量约700mg/L,铜含量约400mg/L,铝含量高达10g/L、铁含量高达4.4g/L的浸出液。针对溶液高铝、高铁,稀土含量低及含铜的特点,采用铵盐预除铝获得硫酸铝铵副产品,进而沉淀除铁、铝,再采用硫化铵沉淀铜获得铜富集物,得到了可供进一步萃取富集或采用化学法制备稀土化合物的稀土溶液。试验结果表明,稀有金属复合矿中的离子型稀土浸出率达88.7%;采用铵盐预除铝-沉淀除铁、铝-除重金属工艺,可综合利用浸出液中的铝、铜,并获得良好的稀土回收效果。     

高铝铁含量的低浓度稀土溶液利用

对西南某地含有少量稀土元素的高硫低品位稀有金属复合矿,采用硫酸铵溶液渗滤浸出获得了TREO含量约700 mg/L,铜含量约400 mg/L,铝含量高达10 g/L、铁含量高达4.4 g/L的浸出液。针对溶液高铝、高铁,稀土含量低及含铜的特点,采用铵盐预除铝获得硫酸铝铵副产品,进而沉淀除铁、铝,再采用硫化铵沉淀铜获得铜富集物,得到了可供进一步萃取富集或采用化学法制备稀土化合物的稀土溶液。试验结果表明,稀有金属复合矿中的离子型稀土浸出率达88.7%;采用铵盐预除铝-沉淀除铁、铝-除重金属工艺,可综合利用浸出液中的铝、铜,并获得良好的稀土回收效果。     

TBP-MIBK协同萃取高硫高砷金精矿浸出液中的铁

利用TBP-MIBK混合体系从金精矿硝酸浸出液的盐酸介质中协同萃取铁, 并研究其萃取机理。通过考察初始料液浓度、盐酸浓度、相比(V_org/V_aq)及混合体系对铁的萃取率和分配系数的影响, 得出萃合物的组成为HFeCl₄·3TBP-MIBK。实验结果还表明: 在初始料液浓度18.09 g/L, 盐酸浓度6.14 mol/L, 有机相组成TBP∶MIBK为7∶3, 相比1∶1条件下, 铁的萃取率达到99.32%, 萃余液中含铁低于0.1 g/L。以蒸馏水反萃, 含铁17.97 g/L的有机相在相比为1∶2时, 铁基本上被反萃完全。通过萃取和反萃, 铁离子溶液中杂质含量大大降低。     

重庆地区煤系高硫稀有金属复合矿稀土的铵盐浸出试验研究

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。     

高冰镍浸出液萃取净化流程

本文用一种新的磷类萃取剂５７０９对高冰镍硫酸选择性浸出液中的镍和钴、铜、铁、铅、锌等萃取性能进行了研究，确定了萃取净化分离的工艺条件。水相料液经过萃取后，萃余液达到１号电镍新液标准，镍收率大于９９％；负载钴等金属的有机相先用低酸反萃钴、铜、锌、铅镍后，再用３ｍｏｌ／Ｌ硫酸反萃除铁；除去金属后的有机相再用ＮａＯＨ溶液皂化复用。有机相在１０台φ２０ｍｍ离心萃取器组成的萃取回路试验中复用了７４次，证明性能稳定。     

低品位氧化锌矿新工艺研究

我国氧化锌矿储量丰富,但贫矿多、富矿少、难于选冶。由于低品位氧化锌矿品位低、杂质含量高、处理工艺复杂等,未能得到有效利用。采用在浆萃取工艺对低品位氧化锌矿进行研究,试验结果表明:采用在浆萃取工艺,矿浆浓度33%,初始硫酸浓度20 g/L,加入硫酸的同时加入萃取剂(30%P204+70%煤油)进行边浸边萃,试验时间为60 min;负载有机相用200 g/L硫酸进行反萃,相比O/A=4,时间15 min。锌浸出率超过97%,萃取率大于99%;硫酸溶液反萃可获得较高反萃率。     

溶剂萃取法从石煤酸浸液中提取V_2O_5的新工艺研究

研究了新型萃取试剂从酸浸液中提取五氧化二钒的新工艺。结果表明:有机相(A)15%+煤油75%+添加剂10%组成的有机溶剂萃取率为99.55%;用80g/L氯化钠作反萃剂,反萃率为98.49%。酸浸液经萃取—反萃后,水相五氧化二钒浓度从9.8g/L富集到115.30g/L,并且主要杂质均被除去,有利于后续提钒工艺地进行。     

石煤钒矿直接硫酸浸出工艺扩大试验

采用添加助浸剂直接硫酸浸出新工艺,针对某石煤钒矿开展了处理规模为1.2 t/d的扩大试验。结果表明,采用两段浸出,一段浸出为常温,浸出时间1.5 h,二段浸出温度为90℃、浸出时间8 h,在保持浓硫酸添加量为25%、助浸剂添加量均为2.5%时,钒浸出率稳定在86%左右,浸出效果良好;萃取选用6级萃取、1级洗涤、4级反萃、2级反铁流程,钒萃取率99%以上,反萃率98.6%;主要杂质元素铁、铝的萃取率分别为2%³%、12%3%、12%¹5%。     

China rare earth market

<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.     

China rare earth market

<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,     

China rare earth market

<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.     

Japanese rare earth market

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.     

2015 rare earth market

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.     

China rare earth market review

正April 1~10,2014Rare earth transactions in Chinese domestic market were slow recently.There was no sign of recovery in demand from downstream industry.There was the rumor about possible storage of rare earth products by the government in short terms.Suppliers were waiting to see further market trend.Downstream     

China rare earth market review

December 1-10, 2012 Turnover in rare earth market remained quiet recently and end users hesitated about purchasing on large volumes. Meanwhile, affected by storage     

China rare earth market review

July 20～31,2011 Rare earth market fluctuated slightly recently and the transactions remained sluggish.Environment control was strengthened in southern China and many rare earth plants had gone out of production. Some traders were considering selling commodities at low price.NdFeB plants had significantly reduced production,which led to slight decrease in the price of dysprosium-related products.Price of europium     

China rare earth market review

January 20～31,2011 There was a big fluctuation in rare earth market with the coming of Chinese lunar new year - Spring Festival. And developing trend in the market was unclear holistically.Many enterprises were unwilling to accept new orders but to see further market trend.Similarly,