生物氧化在内蒙某低品位原生金矿浸出研究中的应用

对内蒙某低品位原生金矿进行了生物氧化浸出实验研究,考查了配入硫磺以及硫精矿对降低酸耗,以及金浸出率的影响。结果表明,当磨矿细度-74 μm 80%,酸浸1 h,矿石酸耗为31 kg/t;全泥浸出24 h,金浸出率为51%~55%;生物搅拌浸出,氧化6 d,硫氧化率为80%,金的浸出率提高到91.4%;生物柱浸,矿石粒度 12 mm 80%,生物氧化170 d-转型-氰化浸出180 d较直接氰化浸出360 d,金浸出率提高3.72%~23.54%;柱内配入硫磺及硫精矿不利于金的氰化浸出;柱外生物氧化硫磺可以减少硫酸酸耗15.7 kg/t。      

Solomon某金矿浸出工艺探索研究

本文对Solomon某金矿进行可行性工艺探索性研究,结果表明,混合原矿,矿石粒度为20 mm,柱浸浸出60 d,渣液合计浸出率为73.19%;浮选金精矿,超细磨粒度为P80=13 μm,金浸出率为68.90%,焙烧预氧化-细磨-氰化,可使金的浸出率提高到91.50%;加压预氧化-氰化后金的浸出率可以达到97.02%。     

两矿法氧化难处理金矿中黄铁矿的研究

本文对黄铁矿-软锰矿两矿法酸性浸出工艺进行了研究,考察了硫酸浓度、配矿比、反应时间、液固比、反应温度等因素对浸出率的影响,确定了最适宜的浸出条件。并在此基础上开展了甘肃某地难处理金矿的浮选金精矿预氧化-氰化浸出试验研究,结果表明,当配矿质量比FeS₂：MnO₂=1:5,反应温度90℃,液固比6:1,初始硫酸浓度100g/L,液固比=6:1,预氧化时间为12h,锰的浸出率达到96.3%。此时,黄铁矿的氧化率达到90.5%,预氧化渣氰化处理后金浸出率达到88.3%。     

陕西某难浸金精矿细菌预氧化提金工艺研究

通过对陕西省某金矿产出难浸金精矿工艺矿物特性的研究,说明了该金精矿为低砷低硫微细粒包裹型难浸金精矿.金精矿中金的直接氰化浸出率为35.3%.经过5d细菌预氧化后,金的浸出率达到92.5%.该金精矿适合采用生物预氧化技术提金.     

含砷锑金精矿的生物预氧化-氰化浸金研究

采用嗜酸性氧化亚铁硫杆菌对含砷锑金精矿的生物预氧化-氰化浸金进行了研究。预氧化结果表明最佳生物氧化工艺参数为: 初始pH值范围为1.8～2.0, 矿石粒径-0.074 mm, 氧化温度为25～30 ℃, 摇床转速为140 r/min, 细菌接种量为20%, 液固比100∶2, 矿浆浓度1%～2%, 氧化时间12 d。浸出结果表明, 含砷、锑分别为10.37%和36.81%的金精矿如不经生物预氧化处理, 金浸出率仅41%左右;而经过12 d的生物氧化预处理, 金浸出率可达76.55%左右, 提高了35.62个百分点。生物预氧化可以脱除金精矿中的砷, 金的浸出率与砷的氧化率成正相关关系。研究结果能为生物预氧化含砷难处理金矿氰化浸金提供理论和技术指导。     

高砷微细浸染型难处理金矿细菌预氧化-氰化提金试验研究

针对高砷微细浸染型难处理金矿, 进行了化学预氧化-氰化浸金和细菌预氧化-氰化浸金。结果表明, 细菌预氧化-氰化浸金能有效氧化金矿石, 在细菌接种量10%、矿浆浓度15%、45 ℃下预氧化7 d, 金浸出率达到89.24%。     

某难处理金精矿中温菌预氧化氰化浸金试验研究

对安徽某难处理金精矿进行了中温菌预氧化氰化浸金试验研究,并与传统焙烧氰化浸金工艺进行了对比。结果表明:采用传统焙烧,金的浸出率为72.3%。采用中温菌预氧化,在摇瓶试验中,矿浆浓度15%,预氧化时间10d,金的浸出率为76.7%~82.8%;在半连续实验中,矿浆浓度为15%,预氧化时间为6~8d,金的浸出率可达90%左右。     

甘肃某金矿强化浸金试验研究

针对甘肃某矽卡岩型金矿石浸渣金品位偏高、金浸出率低的问题,对含金3.70 g/t的金矿石,进行了预氧化、边磨边浸、助浸剂助浸、富氧浸出等多种强化浸金方案对比试验,获得金浸出率91.08%～92.16%的较好指标。本试验研究对该类型金矿的氰化浸金具有借鉴意义。     

难处理金矿石选冶技术研究

甘肃某金矿金矿品位较低,矿石氧化程度较高。金矿物粒度细小,主要以微粒、次显微金矿物形式嵌布于褐铁矿粒间以及被粘土矿物充填的褐铁矿裂隙、孔洞中,属于难处理矿石。根据该矿石性质进行了原矿全泥氰化浸金和浮选富集-氰化浸金两种工艺流程的试验研究,结果表明该两种工艺均可获得较好的选矿指标:原矿全泥氰化搅拌浸出的金浸出率为94.19%;浮选富集-氰化浸金的金浸出率为97.62%,银浸出率为90.80%。由于浮选抛尾可显著提高氰化浸金的设备效率和经济效益,故推荐浮选富集-氰化浸金为该金矿的选冶技术方案。      

新疆阿希金矿含砷金精矿的两段焙烧工艺研究

本文对新疆阿希金矿含砷复杂金精矿进行了研究,结果表明,两段焙烧工艺能有效脱硫脱砷,大幅提升金的浸出率。较适宜的处理条件为：第一段在550℃弱氧化气氛下焙烧1h,第二段在600℃氧化气氛下焙烧1h,焙砂采用稀硫酸浸出,浸出时间2h,控制终点pH值1.0~1.5,酸浸渣细磨至-0.038mm约占90%,氰化采用两浸两洗流程,每段氰化浸出24h,氰化钠消耗量为5.1kg/t_酸浸渣,金浸出率达到93.34%。     

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。