提高锰酸锂产能及压实密度的试验研究

试验研究是将锰酸锂烧结前的混合料(主要是二氧化锰与碳酸锂的混合物)压成团块,再放到烧结炉中进行烧结,由于经压团的物料接触很紧密,其堆密度由1.06 g/cm3提高到1.39 g/cm3,提高了31%,同样体积的匣钵可多装31%的物料,即在几乎相同的电耗及工时的情况下,锰酸锂的产量可提高31%,同时,也大大改善了物料间的高温固相反应动力学条件,有利于反应产物晶粒的长大及晶形完善,使锰酸锂产品的质量得到改善,压实密度由2.90 g/cm3左右提高到3.00 g/cm3以上,这有利于提高电池的体积能量密度。     

高落差复杂地形浆体管道消能方式研究

总结了国内外高落差浆体管道工程的加速流防护经验, 介绍了10余种消能方式, 并从技术和经济上进行了分析比较, 可为今后各种复杂地形浆体管道的工程设计和运营管理提供参考。     

岩石破坏前的损耗比及加卸载响应比特性研究

以多种岩石循环加卸载声发射试验为基础,针对岩石损耗比和加卸载响应比特性进行了研究,探索岩石在受载过程中的内部损伤演化和破坏前兆特性。结果表明,在循环加卸载下角岩等三种岩石损耗比变化特性一致:低应力水平阶段损耗比较大,呈明显下降趋势;中等应力水平阶段比值下降趋势较平缓;高等应力水平阶段比值趋于稳定,在0.08～0.10时,试样破坏。而钨钼矿等三种岩石加卸载响应比变化特性一致:低应力水平阶段卸载时几乎没有声发射,加卸载响应比较大;中等应力水平阶段卸载时声发射较活跃,比值下降至1左右;高等应力水平阶段卸载时声发射很活跃,当比值重新大于1时,试样破坏。试验结果都体现了岩石内部损伤从很小到稳定扩展再到不稳定扩展的过程。可见,损耗比和加卸载响应比的变化特性均可用于评价岩石损伤情况,也可用作岩石破坏预测的参考依据。     

鄂西鲕状赤铁矿还原焙烧机理及分选有效途径探析

研究分析了鄂西鲕状赤铁矿的矿石性质,通过对几种国内典型难选氧化铁矿石与鄂西鲕状赤铁矿石的还原焙烧—磁选对比研究发现,鄂西鲕状赤铁矿与赤铁矿、褐铁矿和菱铁矿的磁化焙烧效果存在较大的差异。对鄂西鲕状赤铁矿还原焙烧机理进行了探讨、分析,指出降低矿石还原焙烧粒度(0.2mm以下)、采用闪速磁化焙烧—磁选工艺是开发鄂西鲕状赤铁矿的一个比较有前途的方向和途径。     

铁矿石选矿技术进步对炼铁节能减排增效的显著影响

阐述了我国铁矿石选矿技术进步和创新开发高效分选的新工艺和新设备。国内众多选矿厂进行铁矿石提铁降硅(杂)生产系统的改造与扩建, 生产出含铁66%～69%、含SiO₂ 3%～5%的高质量铁精矿, 有效地提高了炼铁高炉入炉铁品位, 减少了高炉炼铁废气、废渣的排放量及铁矿石、焦炭及熔剂的消耗量, 对高炉炼铁节能减排增效十分显著。     

金属矿山深井开采过程中的顶板事故浅析

对有色金属矿山深井开采过程中的顶板事故进行分类,并对其产生的原因进行分析;阐述深井开采过程中进行顶板管理研究的重要性,并对国内深井开采的金属矿山顸板管理研究现状进行总结．提出实施顶板动态分级管理的研究方法和不同级别项板的对应处理措施,为深井开采矿山的顶板管理提供新的解决途径．     

Syntheses of LiCoO2 for cathode materials of secondary batteries from reflux reactions at 130–200 °C

Low temperature syntheses of LiCoO₂ cathode materials for Li-secondary battery applications were studied in aqueous solutions by hydrothermal and reflux reactions. By controlling the oxidation potential of the reaction environments, we could synthesize phase pure LiCoO₂ directly from Co(OH)₂ at as low as 130 °C, contrary to the reported hydrothermal reactions at 200–220 °C starting with CoOOH. Having high pH over 15 and an O₂ flow induced the oxidation reaction of the divalent cobalt in Co(OH)₂. The products so obtained have well-crystallized high temperature form of LiCoO₂ with the layered structure as proved by powder X-ray diffraction (XRD) and the Raman spectroscopy data. The particles have a uniform size distribution around 100 nm with well-developed crystallite morphology.     

Electrolytic characteristics of asymmetric alkyl carbonates solvents for lithium batteries

Asymmetric alkyl carbonate solvents (ACS) have been used as components of liquid electrolyte systems designed for Li-ion cells. Four ACS were selected: methyl-propyl carbonate (MPC), ethyl-propyl carbonate (EPC), methyl-isopropyl carbonate (MiPC) and ethyl-isopropyl carbonate (EiPC). The common features of all these ACS are a low melting point and a low viscosity, enhancing electrolytes conductivity toward low temperatures. The viscosity and the conductivity (salt: LiPF₆, 1 M) of the ACS and their mixtures with ethylene carbonate (EC, 50% v/v), were studied as a function of the temperature (T). Arrhenius types plots of the logarithm of the conductivity versus 1/T reveals that ACS and ACS/EC mixtures are vitreous at low temperatures. The electrochemical and cycling behaviors of a graphite anode and a LiCoO₂ cathode have been evaluated using coin cells with a Li counter electrode. The charge and discharge capacities have been determined as a function of the cycle number. MiPC which builds an highly stable surface film on the graphite electrode, can be used as a single-solvent electrolyte with only a slight decrease in capacity of the LiCoO₂ cathode. All ACS/EC mixtures exhibit good filming properties at the negative electrode and no capacity loose at the positive electrode. The ability of some of the electrodes–electrolyte systems to undergo increased rates of discharge (C/5 to C/2) has been also evaluated.     

地下多层复杂空区处理的工程实践

介绍了洛阳栾川钼业集团股份有限公司三道庄矿区多层复合空区的赋存形态、空区处理方案以及采用切割深孔区域整体崩落法一次爆破同时处理多层空区时的工程实践;切割深孔区域整体崩落法处理地下多层复杂空区的孔位布置、施工、装药、爆破及网路、施工安全管理等,对国内外同类型矿山资源的安全、合理的开发利用具有重要参考意义.     

Multi-colored quadtrees for GIS: Exploiting bit-parallelism for rapid boolean overlay

A number of tesselation based GIS using quadtrees as the underlying data structure have been constructed in recent years. At present there is an almost universal trend towards the representation of a thematic layer as a collection of binary, linear quadtrees, one for each color (value) in the layer. In such a scheme set operations are carried out by taking unions and intersections of binary quadtrees. This paper presents an alternative database scheme where a layer is stored as a single multicolored quadtree, using a bit-list to store values at higher nodes in the tree. This allows the union of any set of values within a layer to be carried out by a single top down traversal of the tree, using parallel bit-masking operations. Experimental evidence is presented to show that these Bit-Mapped Multi-Colored quadtrees lead to faster colour selection and boolean overlay between layers in a GIS. Furthermore, the recent development of One-To-Four and Autumnal quadtrees have meant that it is now possible to exploit the hierarchical structure of regular quadtrees in GIS without paying an associated storage penalty. Experimental results using these developments are presented to show that representing a layer using a Bit-Mapped Multi-Colored quadtree is more space and time efficient for set operations in comparison to the use of a collection of binary quadtrees, one for each value in the layer.