前混合水射流超细粉碎煤粒的试验研究

以山西西山煤样为原料,开发了一种适合于煤炭物性的前混合水射流超细煤粉试验装置,研究了加载压力、循环碰撞次数和浓度对超细煤粉大小及分布的影响,并利用激光粒度仪对所得超细煤粉进行了粒度分析,用ξ电位实验研究了超细煤粉颗粒悬浮体系的分散性.试验表明,采用角形喷嘴淹没水射流技术,可以在循环碰撞为3~4次、加载压力为43~50 MPa的工艺条件下将料浆比为25%~35%的煤粒粉碎至d 50<22.6 μm,为采用前混合水射流方法粉碎煤炭制备高性能水煤浆燃料提供了理论基础和关键技术.     

煤泥絮团分选超净煤的试验研究

为探索处理动力煤选煤厂煤泥的新途径,以动力煤选煤厂煤泥为研究对象,分析了煤泥的性质、煤泥中矿物质的种类和嵌布特征,通过分步释放浮选试验考察了该煤泥的理论精煤产率和灰分,分析了煤泥经超细粉碎后分选超净煤的可行性。基于扩展DLVO（EDLVO）理论,论证了絮团浮选前采取高剪切搅拌的必要性,研究了高速搅拌对颗粒和药剂之间的促进作用。采用絮团浮选方法,对超细粉碎后的煤泥进行了超净煤分选试验,探讨了高剪切搅拌叶轮线速度、搅拌时间、煤泥粒度和非极性油用量与分选效果的关系。试验结果表明,只有在高速搅拌的情况下超细粉碎后的煤泥颗粒才能形成絮团,并且在与药剂作用后,降低了需要输入的搅拌功耗;高速搅拌还可以促进药剂的分散,从而增加药剂与煤颗粒的碰撞概率;若要达到较好的絮团分选效果,需要一定程度的搅拌强度和适当的搅拌时间。当粉碎平均粒度为4.70 μm、非极性油用量为135.24 kg/t、叶轮线速度为12.56 m/s、搅拌时间5 min时,分选出的超净煤灰分达到1.15%,产率为69.23%。     

超细煤粉颗粒形状分形维数与球磨工艺的研究

在行星磨完成不同煤的超细粉碎．基于面积一周长法，利用煤粉颗粒的SEM图像结合图像分析软件计算不同工艺条件下的煤粉体的颗粒形状分形维数，结果表明：该方法计算的分维值相关系数多在0．95以上；煤颗粒形状分形是多域度分形；煤颗粒粉碎初期形状分形维数逐渐减小，当粉碎到团聚时间时，其分形维数值反而在增大；含碳量高的煤质在粉碎时，其形状分形维数一般较小；不同助磨剂对颗粒形状分形的影响不同．     

煤的超细粉碎及其发展方向

分析了颗粒几何特性对煤性能的影响和超纯煤的常用制选工艺 ;对煤的超细粉碎设备和工艺进行了介绍和评价 ,提出了煤炭超细粉碎的发展方向和意义。     

一种具有粉碎和提纯双重功能的超细粉碎设备

CM51型超细粉碎设备，在我国非金属矿超细粉碎工艺中得到广泛应用。通过大量实验研究和生产实践，发现它不仅可以达到对矿物进行超细粉碎的目的，而且还兼有提纯矿物的作用。从理论上分析了该机粉碎和提纯的机理，并通过对机内气流运动规律的研究，揭示了该机具有粉碎和提纯双重功能的理论根据。     

神木煤的气流超细粉碎研究

采用常温气流超细粉碎法，结合扫描电镜，傅里叶变换红外光谱分析及激光粒度分析探讨了神府煤田神木３＾－１煤的超细粉碎性能及表面结构。神木煤通过常温气流超细粉碎可达到物理上的均一性，并且使超细煤中无机显微组分及与机显微组分以解离状态存在，煤表面有团含量普遍增加。     

关于粉碎,超细粉碎理论的实验研究新进展

本文总结了粉碎和超细粉碎理论的实验研究的最新发展状况，并且介绍了利用粉碎设备进行超细粉碎实验的研究。     

一种具有粉碎和提纯双重功能的超细粉碎设备

CM51型超细粉碎机设备，在我国非金属矿超细粉碎工艺中得到广泛应用，通过大量实验研究和生产实践，发现它不仅可以达到对矿物进行超细粉碎的目的，而且还兼有提纯矿物的作用，从理论上分析了该机粉碎和提纯的机理，并通过对机内气流运动规律的研究，揭示了该机具有粉碎和提纯双重功能的理论根据。     

落锤法冲击次数对颗粒煤粒度分布规律的影响

在分析落锤法测定煤坚固性系数的过程及方法原理的基础上,通过粒度分布函数及级配曲线研究了冲击粉碎次数对颗粒煤粒度分布特征的影响,并指出利用颗粒煤体积量作为恒量指标大小存在的问题。研究结果表明:随着冲击粉碎次数的增加,煤样被粉碎的越来越小,颗粒煤的特征粒径不断减小并逐渐趋于稳定,冲击能的影响幅度以及粒度分布的均匀性也在不断减小,存在使得其粒度分布稳定的临界冲击次数;特征粒径与均匀系数呈现线性增长关系,与颗粒煤级配曲线的不均匀系数及曲率系数的对数呈线性衰减关系。     

高压水射流粉碎技术制备水煤浆超细煤粉

为降低制备水煤浆超细煤粉时的能耗,采用高压水射流粉碎工艺和传统球磨机粉碎工艺对煤样进行粉碎,通过控制磨煤时间,在保证2种工艺制备的煤样粒度基本相同的基础上,对获得的超细煤粉所需能耗进行了分析。结果表明,高压水射流粉碎技术不但达到了制备超细煤粉的粒度要求,且其能耗仅为传统球磨粉碎能耗的1/10~1/6;获得的超细煤粉颗粒表面光洁、无杂质粘附,且颗粒之间无连接,有利于分选,并具有高的成浆率和堆积效率。     

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

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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.