四川某石英矿选矿提纯试验研究

对四川某地石英砂矿进行了选矿和化学提纯试验研究,最终通过采用磨矿、强磁、浮选、酸浸等工艺,脱除了石英中的杂质元素,获得的石英精矿SiO2含量≥99.95%、Fe2O3≤0.001%、Al2O3≤0.01%,达到了高纯石英砂的标准。     

北海某高岭土尾矿中石英砂的选矿提纯试验

广西北海某高岭土尾矿的矿物成分95%以上为石英。为了给该尾矿的高附加值利用提供依据,在工艺矿物学研究基础上,按照擦洗-分级-棒磨-分级-高梯度强磁选-反浮选-酸擦洗原则流程对其进行石英砂提纯的选矿试验,获得了粒度为0.6~0.1 mm、SiO₂含量达到99.91%、Fe₂O₃含量为79.88 μg/g的高白石英砂产品,并结合选矿试验和工艺矿物学研究结果,针对将来的实际生产提出了不仅可产出高白石英砂,还可获得陶瓷原料、普通石英砂、高岭土等副产品的推荐工艺流程。     

高纯石英砂选矿提纯试验研究

本论文针对云南某地石英砂岩通过擦洗、分级脱泥酸浸提纯方法进行了选矿和化学提纯试验研究。采用加药高效强力擦洗—分级、脱泥—酸处理工艺，脱除杂质元素使石英砂中SiO2含量达到99．98％，杂质Fe2O3≤0．001％，Al2O3≤0．02％，TiO2≤0．012％达到了高纯石英砂的要求。     

石英砂永磁强磁选-酸浸提纯试验研究

采用永磁强磁选-酸浸工艺对普通级石英砂进行排杂提纯实验,研究了矿粉细度、磁感应强度、酸液浓度和浸泡时间对石英砂提纯效果的影响,从而得到提纯效果最佳的条件参数。结果表明:矿粉细度和磁感应强度是石英砂磁选的主要影响因素,磁选后石英砂Si O2纯度可达到99.9%,Fe含量为0.013%;常温下,酸液浓度和浸泡时间是石英砂酸浸的主要影响因素,酸浸后石英砂Si O2纯度可达到99.99%,Fe含量为0.0004%,经该工艺处理后的石英砂已达到超高纯石英砂级别。     

河北某石英砂除杂工艺研究

对河北某石英砂进行工艺矿物学分析,按照"擦洗-煅烧水淬-磁选-酸浸"工艺流程进行除杂试验,探究擦洗时间、煅烧温度、煅烧时间、酸浸温度、酸浸时间各因素对石英砂除杂效果的影响,从而确定最佳试验参数。结果表明,采用"擦洗-煅烧水淬-磁选-酸浸"工艺,最佳试验条件为:擦洗时间15 min,煅烧温度900℃,煅烧时间2.0 h,酸浸组合"3 mol/L HCl+1 mol/L HF+1 mol/L HNO3",酸浸液固质量比3︰1,酸浸温度80℃,酸浸时间6.0 h,Si O2纯度由99.18%提高至99.90%,杂质总含量由7 723.98μg/g下降至789.59μg/g,主要杂质中Al去除率为92.2%,Fe去除率为95.9%。     

乐山石英砂岩除铁提纯试验研究

采用"水洗—酸浸—焙烧—水碎—二次酸浸"工艺进行石英砂除铁试验研究。结果表明,其工艺最优参数为第一次酸浸最优条件:盐酸浓度10%、酸浸温度45℃、盐酸溶液与石英砂质量比5∶1、酸浸时间4h;焙烧最优条件:焙烧温度800℃、焙烧时间2h;二次酸浸最优条件:混酸浓度(HF∶HCl=1∶9)10%、酸浸温度45℃、盐酸溶液与石英砂质量比2∶1、酸浸时间16h。在此条件下,提纯后石英砂的杂质总含量为9.6×10-5,Fe2O3含量为8×10-6,达到高纯石英砂的技术指标。     

湖北某石英矿提纯试验研究

湖北某地发现大量SiO2含量为98.86%的石英矿,为得到优质的石英产品,进行了选矿提纯试验。首先将试样筛分为+0.6 mm、0.1～0.6 mm、-0.1 mm 3个粒级。-0.1 mm粒级作为尾矿直接抛弃;0.1～0.6 mm粒级采用磁选—浮选—酸浸工艺流程进行试验,首先经高梯度强磁选除铁,非磁性产品以草酸为抑制剂、十二胺为捕收剂,经1粗1精反浮选去除云母,浮选精矿以盐酸和硫酸的混合酸为浸出剂,在酸浸温度为60℃、酸浸时间为6 h条件下酸浸提纯后,获得SiO2含量为99.79%、杂质Fe2O3含量为73.70×10-6、白度为90.93%的石英砂,既可以作为光伏玻璃石英砂,也可以作为石英板材;+0.6 mm粒级酸浸后再经色选,可以得到SiO2含量为99.85%、杂质Fe2O3含量为62.65×10-6的石英砂,达到石英板材质量要求。     

粉石英选矿方法研究

通过擦洗、旋流器脱泥、反浮选、酸浸等工艺对浏阳粉石英矿进行了选矿试验,可获得含SiO2≥99.9%、Al2O3≤0.048%、Fe2O3≤0.006%的高纯硅微粉产品。     

陕西某石英砂工艺矿物学及可选性实验

陕西某地石英资源丰富,开展矿物学研究有利于其高值高效利用。基于偏光显微镜、ICP、XRD、EPMA等现代测试技术分析了石英砂化学成分、矿物组成、粒度分布及杂质元素赋存状态等工艺矿物学特征,确定“重选-磁选-擦洗-浮选-酸浸”提纯实验工艺流程,并进行了可选性实验研究。该石英砂原料经提纯除杂,SiO₂含量由99.64%提高到99.90%,杂质总含量由3395.80 μg/g下降至909.85 μg/g,可作为高质量石英砂用于光伏玻璃原料。     

高品级硅微粉选矿试验研究

本文对青海某地石英岩矿通过破碎、超细粉碎、分级、擦洗、磁选、酸洗等一系列提纯工艺进行了选矿和化学提纯试验研究。试验结果表明SiO2含量达到99.97%,杂质Fe2O3≤0.011%、Al2O3≤0.031%,达到高纯硅微粉的要求。     

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。