某铀矿床矿石搅拌浸出试验

为了克服常规工艺高能耗、低效益的缺点,充分利用铀矿资源,针对某碱性铀矿石碳酸盐含量高、铀品位低的特点,开展了堆浸法提取铀的研究。首先进行了酸法搅拌浸出实验、碱法搅拌浸出实验、焙烧去除有机物实验、原矿加温浸出实验、焙烧矿石的加温碱法浸出实验研究。实验结果表明,在常温下的搅拌浸出其浸出率只有65%左右,加温搅拌浸出可达80%左右,找到了从这种低品位碱性铀矿石中浸出铀的有效方法,为下一步堆浸浸出试验研究提供了依据。     

某含磷铀矿酸浸工艺研究

某含磷铀矿矿物组成复杂,耗酸矿物与铀紧密共生,酸耗高,铀浸出率低。在矿石化学分析和矿物分析基础上,开展了浸出工艺试验。结果表明,此含磷铀矿适合酸法搅拌浸出,铀浸出率在95%以上,采用两段逆流浸出工艺,硫酸消耗由单段的25%降到20%,氧化剂二氧化锰消耗降低0.5%。     

预先分级联合选别提高某低品位铜矿金属回收率试验

某大型低品位金铜矿山较高品位铜矿石选用浮选工艺进行富集,低品位铜矿石则利用生物堆浸工艺生产阴极铜,该矿山生物堆场随着堆高的增加,酸铁不断浸出、铜浸出率下降。针对该生物堆浸低品位铜矿石,采用预先分级、选冶联合工艺,并对原有堆浸工艺进行优化,2 mm筛上产品柱浸试验浸出率为75.22%,比原工艺流程浸出率提高了5.08个百分点,铁累积浸出率同比下降了2.75个百分点。-2 mm产品通过浮选工艺最终可获得含铜20.20%、回收率87.21%,伴生金品位3.6 g/t、金回收率58.74%,伴生银品位83.7 g/t、银回收率为68.28%的铜精矿,以及含硫47.12%,回收率33.00%的硫精矿。预先分级、选冶联合工艺铜综合回收率为79.55%,较原生物浸出工艺铜浸出率69.14%提高10.41个百分点,并伴生回收贵金属金、银及副产品硫精矿,使用该工艺可增加利润约1.16亿元。工艺改造后不仅可提高资源利用率,产生较大的经济效益,还可降低酸铁的浸出,大大降低环保处理成本。     

新疆某铀矿石浸出试验

为了给新疆某铀矿采用地面堆浸和井下原地爆破堆浸的采矿新方法恢复生产提供依据，对该矿矿石进行了试验室搅拌浸出和柱浸试验。试验结果表明，该矿矿石氧化剂耗量少、浸出时间短、酸耗较低，属易浸矿石。矿石粒度对浸出率影响较大，当粒度从-5mm增加到-20mm时，矿石的柱浸渣计浸出率从88.7％下降到75．2％。氧化剂可提高浸出液铀浓度，但提高幅度不大。     

从埃及夸达尔铀矿石中回收铀的试验研究

通过对埃及夸达尔铀矿石的矿物学研究和浸出试验，证明其主要铀矿物为硅钙铀矿和β－硅钙铀矿。采用硫酸作浸出剂，搅拌浸出的浸出率为91％以上。在矿石粒度＜10mm，单级喷淋强度为0.05的条件下，柱浸浸出率可达到80％；离子交换的试验显示该类矿石的浸出液适合于用离子交换处理；解吸合格液用NaOH溶液进行沉淀，铀的沉淀效率为99.0%；黄饼的铀品位为60.3%。考虑该矿石铀品位低，渗透性能好，建议采用堆浸－离子交换－沉淀工艺处理。     

某低品位铀矿石的浸出性能研究

采用搅拌浸出和柱浸2种方式对江西某矿低品位铀矿石进行浸出性能的试验验研究。搅拌浸出结果表明,该矿石属易浸出矿石,在硫酸质量浓度为10g/L、搅拌浸出12h时,铀的浸出率高于85%,且加氧化剂对浸出改善较小。柱浸试验结果表明,-5mm为堆浸工艺的最佳筑堆粒度,此时,铀的浸出率为85.7%,酸耗为4.6%(与矿石质量比),且矿堆透水性能良好,为33L/(m2.h)。试验获得的浸出参数,可作为堆浸工业性试验设计和生产中调整浸出参数的依据。     

红土镍矿堆浸搅拌浸出结合工艺中试研究

对红土镍矿堆浸搅拌浸出工艺进行了中试研究, 红土镍矿经洗矿分级后, +0.25 mm粗粒级矿石进行堆浸, -0.25 mm细粒级矿石常压搅拌浸出。结果表明 在堆高4 m, 酸耗700 kg/t, 浸出时间142 d的柱浸条件下, Ni累计浸出率约80%;在酸耗850 kg/t, 浸出时间3.5 h, 浸出温度90～95 ℃, 矿浆浓度26%的搅拌浸出条件下, Ni浸出率可以达到85%以上。     

提高我国铀矿堆浸经济效益的主要途径和适用技术（续完）

结合我国铀矿堆浸实际,在重视堆浸可行性研究、采用强化堆浸技术、改进霍浸装备水平、严格工艺条件及拓宽堆浸的应用范围等方面提出一些有效途径及适用技术,包括采用拌酸熟化高铁淋滤浸出、细菌堆浸、制粒堆浸、逆流堆浸,选用优质底垫层材料,研制大型机械化筑堆方法和设备,推广滴灌式布液,优化堆浸工艺参数,以及开发堆浸相配套的回收设备等,以提高浸出率、缩短堆浸周期,获得更大的经济效益。     

南方某铀矿石堆浸酸度试验

介绍南方某铀矿低品位铀矿石堆浸工业试验,根据该矿石特性,进行不同酸度浸出剂浸出试验,得出该铀矿石堆浸的经济酸度.试验结果表明,采用浸出剂酸度控制模式后,铀浸出率提高5%,酸耗降低0.5%以上,浸铀周期缩短40 d以上,为该矿堆浸工业生产提供了技术经济指标和可靠的科学依据.     

泥矿和高品位精矿搅拌浸出工艺研究

对堆浸前矿石的破碎分级中的泥矿和高品位精矿进行了搅拌浸出工艺的实验室试验研究和现场验证试验。泥矿酸法搅拌浸出铀浸出率达到96%以上。高品位矿石碳酸盐含量高,酸法浸出铀浸出率可达99%以上,但是酸耗高;而碱法浸出高品位矿石时,在常温条件下浸出率不到70%,提高浸出温度可显著提高浸出率。使用压滤机进行固液分离是可行的,其矿石处理能力可达到155 kg/(m2.d),洗涤效率达99%以上。     

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。