气浮法脱除模拟锌浸出液中的油酸钠

为了给采用气浮法对锌浸出液进行有机杂质净化提供参考,以φ35 mm×200 mm浮选柱为气浮设备,对Zn²⁺浓度为45 g/L、油酸钠浓度为2×10-4 mol/L、pH值为5.1的模拟含油酸钠锌浸出液进行气浮净化试验,通过单因素试验和正交试验考察了气浮时间、泡沫层厚度和表观气速对净化效果的影响。结果表明：在气浮时间为6 min、泡沫层厚度为1 cm、表观气速为0.096 cm/s条件下,油酸钠脱除率达到91.69%,Zn²⁺保留率为92.94%;3个因素中,气浮时间对油酸钠脱除率的影响最显著,表观气速的影响次之,泡沫层厚度的影响相对最弱。     

聚合物微球立体堆砌抑制酸雾新方法研究

为寻找经济而高效的抑制酸雾产生的策略,为酸雾抑制方法的研究提供理论支持及技术指导,制备了某种聚合物微球,并利用实验室自行设计的酸雾产生的装置模拟酸雾的产生,通过观察pH试纸的变色情况对酸雾产生量做出定性分析,考察微球堆砌层厚度、聚合物微球球间间隙及密度等条件对酸雾抑制效果的影响。结果表明:当堆砌层厚度大于10mm时,抑雾效果明显;采用不同粒径范围的聚合物微球进行组合堆砌时,小粒径聚合物微球(0.45～0.9mm)的用量比对酸雾抑制的效果影响较大,其用量大于50%时具有较好的抑雾效果;聚合物微球的密度也对堆砌层中悬浮层及沉浸层的厚度具有较大影响,悬浮层厚度占堆砌层厚度40%时,可有效提高抑雾效果。     

OAS对水性薄型钢结构防火涂料的性能影响

本试验研究磷酸酯化钠基助熔剂(OAS)对水性薄型钢结构防火涂料的性能影响。结果表明:OAS能有效改善防火涂料的耐火性能,随着加入量的增加,耐火极限也增加,最佳加入量为3.5%,再增加作用不大;涂层厚度以1.0~2.0 mm为宜,耐火极限为70~106 min,能满足60 min的防火要求。防火机理为OAS能在340℃左右出现液相,延缓氨气、水蒸气、二氧化碳等气体的溢出和磷酸的流失,改善炭化层发泡效果,以及加速硫酸钛和焦磷酸钛的形成,有利于炭化层和无机稳定材料交融和复合,从而提高防火效果。     

基于正交试验对深部巷道锚喷网支护参数的设计与优化

针对深部围岩巷道支护问题,通过现场设置测点对地应力进行测试,并在参考深部围岩支护措施基础上,设计正交试验就锚喷网支护措施中各因素对支护的影响进行分析,得到各因素对巷道围岩的变形影响大小依次是喷层厚度、锚杆间排距、锚杆长度、锚杆直径。并借助ANSYS对正交试验得到的使巷道变形和破坏影响最小的最佳组合方案进行优化,通过优化得到了深部岩体的最合理经济的锚喷网支护参数为喷层厚度为80 mm、锚杆间排距为0.8 m×0.8 m、锚杆长度为1.8m、锚杆直径为准42 mm的管缝式锚杆。     

泡沫层厚度对低品位铝土矿柱式分选影响的半工业试验研究

针对影响低品位铝土矿柱式分选的重要因素—泡沫层厚度,利用旋流—静态微泡浮选柱开展了半工业试验研究,探究了在"快速浮选—一次粗选—一次精选"工艺下粗选浮选柱和精选浮选柱中泡沫层厚度对浮选效果的影响。研究发现,泡沫层厚度对精选段的影响明显高于对粗选段的影响;粗选最佳泡沫层厚度为45 cm,精选最佳泡沫层厚度为50 cm,且在该泡沫层厚度下获得了A/S为6.36、回收率为77.95%的合格精矿。     

密闭空间CO及CO_2组合净化研究

为了保障密闭空间内避难人员的生存环境,设计了一套空气净化装置,对常用CO_2吸收剂碱石灰、氢氧化钙、氢氧化锂进行了实验对比;对CO催化剂霍加拉特和钯铂ACO-2系列催化剂进行实验对比;运用正交实验的方法探究CO和CO_2组合净化情况下药品最佳风量;进一步探究2种药品净化最佳厚度。通过以上实验发现碱石灰吸收CO_2效果最好,霍加拉特催化CO较佳;组合情况下净化最佳风量为40 L/min;碱石灰的厚度为225 mm,霍加拉特的厚度为150 mm。     

聚能光面爆破光爆层参数优化研究

结合聚能爆破对光面爆破光爆层参数进行优化分析，分析了聚能爆破初始裂纹的形成机理，提出了采用双孔聚能方向裂纹贯通时和非聚能方向主裂纹与反射拉伸波引起的拉伸裂纹贯通时的时差作爆破效果评价标准，结合裂纹最终扩展效果进行分析，并将研究结果应用于实际工程中。研究表明：仅从裂纹贯通时差的角度分析，在一定范围内光爆层厚度越小，炮孔间距越大，效果越佳；在相同炮孔间距下，随着光爆层厚度的增加，光爆层的裂纹密度逐渐减小，为保证炮孔间裂纹的有效贯通及有效控制破碎块度大小，炮孔间距不宜大于700 mm、光爆层厚度不宜小于500 mm且不宜大于700 mm；当药型罩为PVC的椭圆双极线性聚能药包装药结构，炮孔直径为42 mm时，聚能光爆层最优爆破方案为“炮孔间距为700 mm，光爆层厚度为600 mm”。研究结果为类似工程光面爆破周边眼参数的设计提供参考。     

ZrO2/莫来石热障涂层热冲击性能计算机模拟

为确定ZrO_2/莫来石热障涂层的单层最佳厚度,采用有限元技术研究单层厚度对ZrO_2/莫来石热障涂层热冲击应力的影响。结果表明,莫来石层厚度为0.25mm时,涂层表面及ZrO_2/莫来石界面处具有最大热应力,而其他厚度时涂层内部热应力受莫来石层厚度影响不明显。当ZrO_2层厚度为0.3mm时,ZrO_2/莫来石涂层中的热应力在整个横向距离范围内保持稳定,而其他情况下涂层中的热应力则与ZrO_2层厚度成正比。涂层表面处的径向热应力大于ZrO_2/莫来石界面处的对应值。     

贾燕1,赵永涛2,张红松2

为确定ZrO2/莫来石热障涂层的单层最佳厚度,采用有限元技术研究单层厚度对ZrO2/莫来石热障涂层热冲击应力的影响。结果表明,莫来石层厚度为0.25mm时,涂层表面及ZrO2/莫来石界面处具有最大热应力,而其它莫来石层厚度时涂层内部热应力则受莫来石层厚度影响不明显。当ZrO2层厚度为0.3mm时,ZrO2/莫来石涂层中的热应力在整个横向距离范围内保持稳定,而其它情况下涂层中的热应力则与ZrO2层厚度成正比。涂层表面处的径向热应力大于ZrO2/莫来石界面处的对应值。     

基于正交试验的深部岩巷稳定性数值分析

为了解决深部岩巷稳定性问题,基于正交试验方法,采用大型有限元软件建立了25个正交试验模型,以巷道两帮、顶板、底板变形量及稳定安全系数4个指标作判据,研究了锚杆长度、锚索长度以及喷层厚度3个因素不同水平下对深部岩巷围岩稳定性的影响,并采用方差分析和多元回归分析法拟合了巷道两帮、顶板、底板变形量及稳定安全系数4个指标与3个影响因素之间的数学表达式。结果表明:喷层厚度是影响巷道拱顶变形量和稳定安全系数的关键因素,锚杆长度是影响巷道帮部和拱底变形量的关键因素,且当锚杆长度为2.5~3.0 m、锚索长度为8~9 m、喷层厚度为100~150 mm时,岩巷稳定性得到明显提高。     

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     

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     

2014 second batch of rare earth quota released

正~~     

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     

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.