煅烧煤矸石中铝铁和硅组分的硫酸浸出行为差异研究

以硫酸为浸出剂对古交东曲矿煤矸石中铝、铁、硅组分的浸出行为差异进行了研究。结果表明,煤矸石中铝、铁和硅组分的硫酸浸出行为差异很大。在硫酸浓度7.5mol/L、液固比4:1、120℃浸出150min,TFe、Al_2O_3、SiO_2的浸出率分别为98.31%、97.19%和15.88%,TFe、Al_2O_3和SiO_2的浸出率差异分别达到82.43%、81.31%。显然,硫酸浸出可实现煤矸石中TFe、Al_2O_3和SiO_2的清洁分离,使TFe、Al_2O_3组分富集到浸出液中,SiO_2组分富集到浸出渣中。最终获得了pH3、Al、Fe元素含量分别为10.2g/L和3.4g/L的浸出液和SiO_2含量高达90.22%的浸出渣。     

湿法炼锌高钴渣处理工艺研究

采用锌粉置换除钴得到的高钴渣,针对现有工艺的不足,提出了一段硫酸浸出-二段高钴渣中和-过氧化氢氧化除铁-锌粉置换除镉-新型活性硫化剂（简称除镍试剂）除镍-过硫酸钠选择性氧化除锰-过硫酸钠氧化沉钴的湿法冶金工艺,实现渣中钴和镍的分离回收。对工艺流程探究,得出了较优的实验结果。硫酸浓度为150 g/L,温度80℃条件下浸出120min,钴的浸出率为96.14%。锌、镍、镉、铁、锰的浸出率均大于99%。过氧化氢沉铁率达到99.8%以上,过硫酸钠除锰可使锰除到0.13mg/L,沉淀率达到99.98%,Co沉淀率达到99.99%,氧化渣中钴含量达到49.75%。     

氧化铜钴精矿浸出试验研究

以硫酸为浸出剂, 针对某含铜5.75%、含钴0.34%、以铜计氧化率为78.96%的氧化铜钴精矿进行了浸出工艺研究。结果表明, 在浸出温度50 ℃、酸矿比0.3∶1、液固比4∶1、浸出时间6 h条件下, 以渣计铜浸出率达到94.34%、钴浸出率达到97.57%, 浸出液中铜含量为12.38 g/L, 钴含量为0.73 g/L, 铁、锰、镁等杂质含量均较低。     

从低品位含铝矿石酸浸液中回收铝

从低品位含铝矿石湿法处理过程综合回收铝,实现低品位含铝矿物的资源化或高值化利用具有重要的现实意义。以硫酸浸出低品位含铝锐钛矿原矿得到的高铝铁浸出溶液为研究对象,采用硫酸铝铵结晶沉铝—树脂吸附除铁—焙烧联合工艺制备高纯Al_2O_3。结果表明,在铝离子初始浓度0.70mol/L、NH~(4+)/Al~(3+)摩尔比1.2、结晶终点温度20℃条件下,以300r/min的速度搅拌30min,可获得晶体纯度95.31%,铝的回收率88.19%,夹杂铁的含量1.39%的NH_4Al (SO_4)_2·12H_2O粗产品。将NH_4Al(SO_4)_2·12H_2O粗产品通过两次重结晶和一次树脂吸附除铁,最终在1 300℃条件下焙烧可得到纯度为99.99%的Al_2O_3。     

刚果(金)水钴矿高压酸浸实验研究

以刚果(金)水钴矿为原料, 对其焙烧预处理后, 采用高压酸浸方法获取浸出液, 考察了硫酸浓度、液固比、浸出时间等因素对浸出过程中主元素及杂质元素浸出率的影响。研究结果表明:在硫酸浓度为0.2 mol/L、液固比为10∶1、浸出时间180 min的条件下, 经高压浸出最终可获得钴、铜、镍、铁和镁浸出率分别为92.8%、96.7%、95.3%、2.3%和2.5%的浸出后液, 较好实现了原料中高价值元素的高效回收以及与杂质铁、镁的初步分离。     

印尼某红土镍矿常压浸出实验研究

以印尼某地红土镍矿为原料,考察了浸出时间、浸出温度、硫酸浓度、液固比等因素对硫酸常压浸出镍、铁的影响。结果表明,硫酸浸出红土镍矿的适宜工艺参数为: 初始硫酸浓度300 g/L、液固比6∶1、搅拌速度300 r/min、浸出温度85 ℃、浸出时间240 min,此优化条件下红土镍矿中Ni浸出率97%,Fe浸出率83%。对浸出渣进行XRD、SEM分析表明,红土镍矿晶型较稳定,浸出后形貌无较大变化; 浸出渣主要成分为铁氧化物、硅氧化物和铁酸镍、铁酸镁。     

加铝熔炼—酸浸回收镍基高温合金废料

采用加铝熔炼—酸浸技术回收镍基高温合金废料,首先采用加铝熔炼技术制备加铝合金,然后利用机械破碎方式破碎加铝合金制备加铝合金粉,最后用盐酸浸出合金粉回收合金废料中的钴镍等金属。结果表明,加铝熔炼过程中铝加入质量分数为30%,熔炼温度为1 600℃时所得加铝合金质脆、易破碎,破碎后所得合金粉粒度小且粒度分布窄,破碎合金粉粒度D90为20μm左右。对此合金粉采用盐酸浸出的效果比采用硫酸的好,最佳盐酸浸出工艺条件为:盐酸浓度5mol/L、温度85℃、液固比10mL/g、浸出时间60min,在此条件下合金中的镍钴铝铬等元素进入浸出液,而钛、钼等稀有元素主要富集在渣中,合金中各金属的浸出率在80%～90%。     

加铝熔炼—酸浸技术回收镍基高温合金废料

采用加铝熔炼—酸浸技术回收镍基高温合金废料,首先采用加铝熔炼技术制备加铝合金,然后利用机械破碎方式破碎加铝合金制备加铝合金粉,最后用盐酸浸出合金粉回收合金废料中的钴镍等金属。结果表明,加铝熔炼过程中铝加入质量分数为30%,熔炼温度为1 600 ℃时所得加铝合金质脆、易破碎,破碎后所得合金粉粒度小且粒度分布窄,破碎合金粉粒度D90为20 μm左右,对此合金粉采用盐酸浸出的效果比采用硫酸的好,最佳盐酸浸出工艺条件为：盐酸浓度5 mol/L、温度85 ℃、液固比10 mL/g、浸出时间60 min,在此条件下合金中的镍钴铝铬等元素进入浸出液,而钛、钼等稀有元素主要富集在渣中,合金中各金属的浸出率在80%~90%。     

大洋富钴结壳熔炼合金的锈蚀浸出及除铁研究

采用锈蚀浸出工艺处理DY95-9 航次大洋富钴结壳熔炼合金粉末, 研究了浸出酸量、浸出时间及催化剂对合金中钴镍铜等有价金属浸出率的影响。在最佳锈蚀浸出条件及经除去浸出液中的少量铁后钴镍铜锰的浸出直收率分别为93.68%、94.55%、91 .73%和95 .62%, 而几乎全部的铁、磷、碳和钼等进入浸出渣中, 锈蚀浸出过程中铁基本不耗酸。     

刚果(金)某铜钴尾矿还原浸出钴

采用硫酸作浸出剂,对刚果(金)某尾矿库中的铜钴尾矿加入还原剂进行柱浸试验。研究还原剂种类、还原剂加入量、造球直径、反应温度、浸出时间等对钴、铜、铁、镁和锰等金属浸出率的影响,确定浸出最佳条件。在优化条件下,还原剂Na2SO3加入量为钴还原理论量的3.0倍,造球直径为8 mm,常温条件下浸出60 d,钴、铜、铁、镁和锰的浸出率分别为85.94%,92.93%,30.42%,21.84%和96.96%。优化条件下,钴浸出平均硫酸消耗为30 t/t-钴。     

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     

矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586     

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     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。