真空开关管真空度的鉴别

<正> 开关管具有一定的真空度,才能有合格的分断电流能力。一般高压开关管内的真空压力增加到1.333×10~(-2)Pa(1×10~(-4)Torr)以上,低压开关管压力增加到1.333×10~(-1)Pa(1×10~(-3)Torr)以上时,开关管将丧失分断能力,即丧失真空寿命。开关管是否具有有效的真空度,要定期进行检验,这同油开关要定期做油质化验一样。每个开关管都有不同的有效真空寿命。真空开关不论使用还是贮存,时刻都在减少其真空寿命,因此     

铝从AlCl_3-NaCl-LiCl熔体中电解析出的动力学

应用电化学暂态技术进行的研究表明,铝的还原为包含三个电子的简单快速反应。速度决定步骤的电子转移数为1。成核过程完成得很快,对铝析出的动力学无明显影响。试验条件下测得的铝离子扩散系数为4.5×10~(-5)cm~2/s,标准速度常数为0.2cm/s。     

极谱催化波测定痕量钴-二氮菲-硫脲-四乙基碘化铵体系

钴在1×10~(-6)M二氮菲-2×10~(-3)M硫脲-6×10~(-4)M四乙基碘化铵介质(NH_4OHNH_4Cl缓冲液,pH9.3)中产生灵敏的催化波。峰电位为-1.65伏(VS.S.C.E.),检测下限为5×10~(11)M。钴的浓度在1×10~(10)-1.3×10~8M范围内与峰高呈线性关系。本法灵敏度高,选择性好、操作简便。已用于直接测定锌精矿、锌电解液和废水中痕量钴。     

连四硫酸根选择电极的研制及在铀工艺中的应用

叙述了PVC膜连四硫酸根选择电极的研制方法,该电极活性物质为季铵盐。膜的最佳组份为2％(W/W)三庚基十二烷基碘化铵(THDDA),68％邻苯二甲酸二(2-乙基已)酯(DEHP)和30％PVC。电极响应S_4O_6~(2-)的线性范围为1×10~(-5)—1×10~(-1)mol/L,检测限为1×10~(-6)mol/L。在pH4.5至10,其电位值不受pH的影响。该电极对不同阴离子的选择性系数为S_2O_6~(2-)4.4×10~(-3),S_3O_6~(2-)1.4×10~(-1),SO_4~(2-)、S_2O~(2-)和SO_3~(2-)10~(-5)。可用S_4O_6~(2-)PVC离子选择电极直接测定铀矿石碱浸液中S_4O_6~(2-)含量。S_4O_6~(2-)的检测限为10mg/L,相对标准偏差为±10％。     

沉淀法提取ML浸金液中的金

对Na2S沉淀ML浸金液中金的过程进行热力学上分析和计算.计算结果表明,Au2S和Cu2S在ML浸金液中的溶解度分别为2.32×10-11和7.20×10-11,Au和Cu开始沉淀的[S2-]浓度分别为4.78×10-24和3.67×10-23.最佳沉金条件t=30min,溶液pH=9,温度20～30℃,沉淀剂用量ms=1.5×A*C*V/2B.     

提前启用西排土场提高矿山经济效益

<正> 1 原排弃方案简介 霍林河南露天煤矿是一座大型褐煤露天矿,国家“八五”重点能源建设项目之一。该矿采用单斗—汽车生产工艺,总体设计能力为10×10~6t/a,分两期建成。首期3×10~6t/a,已于1984年9月1日移交;扩建工程7×10~6t/a,于1992年9月3日移交投产。     

石英粉去除铝、钾、钠的研究

采用浮选法和超声波酸浸法去除石英粉中的铝、钾、钠杂质,用原子吸收分光光度计分析经浮选和酸浸处理的样品中铝、钾、钠杂质的含量。结果表明,较佳的除杂工艺参数是:在pH=2,十八胺浓度范围为8.0×10-7～8.0×10-6mol/L,十二烷基磺酸钠的浓度为4×10-6mol/L时浮选;浸出的混合酸为18%的盐酸和2%的氢氟酸,浸出温度为50℃,超声波酸浸处理1h。在此条件下,可使石英中铝含量从128×10-6下降到14×10-6,钠含量从114.7×10-6下降到1.2×10-6,钾含量从8.6×10-6下降到0.4×10-6,达到高纯石英砂的标准。     

长钢尺导入标高时自重伸长改正数计算

关于长钢尺导入标高时自重伸长改正数的计算,高等学校教学用书《矿山测量学》[1,2]推导给出的公式是: △ι_c=Υ/E(L-ι/2)ι (1) 式中Υ—钢的容重; E—钢的弹性系数,等于2×10~6Kg/cm~2; L—钢尺自地面绞车上至井下挂垂球处的自由悬挂长度; ι—井上、下水准仪视线间的钢尺长度。实际上,上述公式是不正确的。图中,RT=L为钢尺自由悬挂长度,ι为井上、下水准仪视线间的钢尺长度,S为钢尺上的任意一点。设RS=x,ST=L-x,ST段钢尺的重量为Q,则     

文摘与简讯

用皂类浮选法分离铝矾土与赤铁矿以C_(6-12)脂肪酸皂为捕收剂,研究了人工Al_2O_3与赤铁矿和天然赤铁矿的浮选,以便从赤铁矿中分离Al_1O_3。使用辛酸盐,以KF为Al_2O_3的抑制剂,从人工赤铁矿中分选Al_2O_3是可能的。在PH5.5—6.5条件下,当使用2×10~(-3)M(2.3公斤/吨矿石)的KF和7×10~(-5)1×10~(-4)M(0.2—0.3公     

GL-103型石墨复合导料槽研制与应用

本文研制了一种新型玻璃传送器润滑材料GL-103型石墨复合导料槽。通过室内石墨含量、碳纤维含量、乳化液、负荷与速度对导料槽性能的影响评价,导料槽具备以下性能:抗压强度13818×10~4Pa,热膨胀系数5.5×10~(?),摩擦系数μ0.06～0.13,耐磨性9500(?)·μm~(-1)左右。现场试验证明:导料槽的使用寿命达105天。一台制瓶机的年费用不足原来的8%,且避免了环境污染,提高了制瓶质量。     

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     

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.     

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     

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     

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.     

Brief news

正Corun invested another 50 million yuan in power battery for HEV Hunan Corun announced on 27 June that they had signed the cooperation agreement to jointly built Corun(Shaoxing)Autos Power Battery System Co.,Ltd.in Shaoxing Binhai New City.According to the announcement,total registered     

铜熔炼中锍品位对杂质元素分配行为的影响

借助于多相、多成分系统中平衡计算的手段，开发出微量元素砷、锑、铋及伴生元素铅、锌等在铜熔炼中分配行为的计算机模型。利用该模型对铜熔炼过程进行计算机模拟，分析了冰铜品位对砷、锑、铋、铅和锌等杂质元素的分压、活度系数及它们在冰铜、炉渣和气相中分配率的影响，并讨论其热力学分析结果对生产实践的指导意义。     

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