某砂质高岭土增白试验研究

为了合理高效开发云南某高岭土矿资源,基于矿石性质分析,分别采用连二亚硫酸钠和二氧化硫脲2种还原剂开展增白试验研究。针对粒度-0.020 mm的高岭土样品,确定二氧化硫脲漂白适宜的工艺条件为矿浆浓度20%、二氧化硫脲用量2.0%、矿浆p H值13、草酸用量5%、反应温度30℃、反应时间20 min。在此条件下,高岭土中Fe2O3含量从0.95%降低至0.70%,除铁率达26.32%,自然白度由65.0%提高至83.5%。与连二亚硫酸钠相比,除铁率提高了11.58个百分点,自然白度提高了9.1个百分点。二氧化硫脲在加热或被碱催化时产生强还原性的次硫酸,次硫酸将高岭土中不溶性铁还原为可溶性亚铁后除去,进而提升砂质高岭土的白度。相较于二亚硫酸钠,二氧化硫脲除铁效果好、化学性质稳定且环境污染小,可用于同类型高岭石的除铁增白。     

广东砂质高岭土除铁增白试验研究

以广东某地砂质高岭土为研究对象,对其Φ50mm水力旋流器溢流产品进行高岭土除铁增白试验研究。采用"磁选-还原漂白"工艺流程,磁选设备为slon-100型高梯度强磁选机,磁选条件:磁介质为细刚毛,磁场强度1.4T,矿浆流速1.0cm/s,脉动强度200 r/min。主要研究了pH值、酸种类、保险粉用量、保险粉加药次数、草酸用量、反应时间、温度和漂白次数等因素对还原漂白效果的影响,得出了最佳漂白工艺条件:矿浆质量分数20%,用硫酸调节pH值至2.2,保险粉用量3%(分3次加入),草酸用量2%,反应时间30 min。经"磁选-还原漂白"后,高岭土白度从56.04%提升到66.61%,1200℃煅烧白度达86.10%,可满足橡塑填料和陶瓷工业等领域的应用要求。     

宜春低品位粉石英化学漂白工艺研究

采用盐酸-保险粉法对宜春低品位粉石英进行化学漂白时,最佳工艺条件:矿浆浓度20%、漂白40min、矿浆pH值3左右、保险粉用量1.5%.Fe2O3由0.72%降为0.09%,SiO2含量和白度分别由97.54%和53.02%升至99.79%和75.54%,产品质量稳定.     

高岭土漂白研究

保险粉漂白高岭土是提高高岭土白度常用的一种方法,该法关键有二,一是加药漂白,一是洗涤。本文根据保险粉是强还原剂,但又很不稳定的特性,分析研究了影响其漂白效果的各个因素以及工艺条件,从而使高岭土白度长从62～78度提高到82～87度。而漂白后的洗涤,对高岭土能否满足造纸涂料级的要求具有重要意义。     

广西高岭土漂白试验研究

以广西高岭土为研究对象,采用Φ50mm水力旋流器溢流产品为原料,进行高岭土还原漂白试验研究。研究了硫酸用量、加药次数、保险粉用量和草酸用量等对漂白效果的影响。结果表明,硫酸用量为22.08kg/t,分次加入,保险粉用量为6%,草酸用量为4%,矿浆浓度为16%,反应时间为30min。该高岭土经还原漂白后,白度从54.53%提升到75.44%,且大部分理化指标达到搪瓷、橡塑和陶瓷工业用二级以上标准。     

高岭土漂白过程中铁溶出率实验研究

以漳州某地高岭土为研究对象,在酸性条件下同时添加连二亚硫酸钠和铝粉对其进行除铁实验,用铁溶出率表征除铁效果。采用正交试验得出较优工艺条件为：固体质量分数13.79%,硫酸用量4.0%,保险粉用量2.0%,铝粉用量0.3%,反应时间24 h。实验表明,在传统保险法漂白工艺中添加适量铝粉,可明显提高铁溶出率。     

江西某低品质高岭土矿综合利用技术研究

以江西某低品质高岭土矿为研究对象,在原矿化学元素、矿物组成等分析的基础上,制定了高岭土提纯工艺及尾矿综合利用技术方案。原矿采用"捣浆—分级—提纯—磁选—化学漂白"工艺进行选别,得到高岭土深加工产品,其高岭石含量82%,自然白度79.8%、烧成白度90.1%,Fe2O3含量0.54%;尾砂经分级、磨矿、浮选,分离白云母与石英两种产品,其中白云母产品中K2O含量达到7.89%,白云母矿物含量85%,石英产品中SiO2含量达到97.78%,石英矿物含量96%。工艺流程对该高岭土矿实现了全组分综合利用,解决了低品质高岭土矿利用率低、尾矿大量排放的难题。     

黔中某地高岭土提纯试验研究

以某高岭土矿为研究对象,采用捣浆-筛分-筛上物再磨强磁选-筛下物强磁选漂白工艺,进行提纯试验研究。结果表明,用0.045 mm筛子对捣浆所得矿浆进行筛分,分别获得产率为54.69%、45.31%的筛上物和筛下物;筛上物经再磨,在-0.045 mm粒级含量为45.17%、磁感应强度为1.4T的条件下进行强磁选,获得TC-0优级陶瓷工业用高岭土精矿;筛下物经强磁选,强磁选高岭土粗精矿在保险粉用量1.5%、草酸用量1.5%、漂白时间2h的条件下漂白,获得TC-2二级陶瓷工业用高岭土精矿。     

湖南某风化型高岭土漂白试验

提升高岭土的白度是扩大其应用领域,提高其附加值的重要手段。以湖南某风化型高岭土为研究对象,对高岭土还原漂白的条件进行了研究。结果表明:在液固比为5∶1,用10%的稀硫酸将矿浆调至p H=2.5,加入试样质量7%的保险粉、2%的草酸,常温下搅拌60 min后洗涤、过滤,在80℃烘干,最终可获得白度值为83.9%的高岭土产品。     

唐山矿煤系高岭土增白试验研究

唐山矿浮选尾煤中煤系高岭土含量较高,但自然白度较低,对煤系高岭土先进行提纯和磁选处理,再采用"先煅烧后漂白"和"先漂白后煅烧"两种工艺进行对比试验。结果表明,"先煅烧后漂白"的工艺效果最佳,产品白度达到90.88%,且SiO2和Al2O3含量符合工业橡胶用高岭土指标要求。     

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。