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。     

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。     

伊利石漂白工艺研究

以伊利石为研究对象,采用伊利石泥浆为原料,进行伊利石漂白试验研究。研究了亚硫酸氢钠—锌粉漂白工艺、保险粉漂白工艺和煅烧漂白工艺对漂白效果的影响。结果表明,伊利石白度由原矿的72%提高到80%、80.12%和81.2%。与亚硫酸氢钠—锌粉漂白工艺和保险粉漂白工艺相比,煅烧工艺漂白可节约成本14%以上。     

China rare earth market review

正November 1~10,2014Chinese rare earth market was still inactive.Demand for rare earth products was weak.Consumers took a wait-and-see attitude for lower price.As it was an off season for rare earth products,it was expected that prices of rare earth could continue turbulence at the bottom in short terms.Due to a sharp drop,demand for rare earth from downstream recovered.Affected by new energy vehicles,wind powder and energy-efficient appliances,production of rare earth permanent     

China rare earth market review

正August 1~10,2014 There was some good news in rare earth industry recently.Restructuring plans of rare earth groups led by Baotou IronSteel Group and Xiamen Tungsten Group respectively have been approved by MIIT.And rare earth storage policy,which had been expected for a very long time,has been launched officially.Pushed by the good news,rare earth price started to rebound since August 5.Price of didymium oxide and dysprosium oxide rose about 1% to 2%,averagely.About 10% of     

China rare earth market review

正July 1~10,2014Due to weak demand from downstream industry and slow transactions,rare earth market remained weak and price of rare earth products continued to decline.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,     

New energy vehicle:an opportunity for rare earth magnets

<正>Extracted from Securities Guide 1.Popularity of new energy vehicles—an irresistible market trend1.1 Progress of new energy vehicles Chinese Premier Li Keqiang said recently on a visit to Xi'an BYD Autos that new energy vehicles,especially new energy bus,can lessen environment and noise pollution.He encouraged the use of new     

注浆加固技术在十三矿-685 m进风大巷中的应用

针对煤矿开采深度不断向深部延伸,掘进巷道受深部高应力的影响越来越大,巷道围岩整体稳定性差,矿山压力显现越剧烈现象,一般锚网喷加锚索支护无法从根本上控制巷道的变形。总结了平煤股份十三矿-685 m进风大巷注浆加固技术,依据对巷道掘进之后变形监测数据的采集,对巷道变形机理进行分析研究,并对注浆时段进行了合理选择,在对巷道的注浆工艺进行了充分论证的基础上,对巷道进行了注浆。注浆后效果表明:巷道滞后注浆时间段的选择非常重要,巷道在恰当的时间内进行注浆加固施工,能有效控制巷道的变形,巷道注浆后变形量明显减小,岩体的稳定性明显增强,减少了巷道日常维修工作,降低了矿井的生产成本,保障了矿井的安全生产。     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel