悬臂式掘进机主要技术参数的选择

系统地阐述了悬臂式掘进机主要技术参数的选择方法 ,给出了常用的经验数据和计算公式。     

改变作业参数提高电铲装车效率

从电铲台年产量和主要生产参数入手,分析了采掘带宽度和效率的关系,确定了采掘带的最佳宽度,运用该方法完成了在用电铲采掘带的技术改造,对降低剥采成本具有重要意义。     

提高低变质程度煤成浆性能的研究

对4种低变质度煤与淮南煤、淮化的旧气化系统废料无烟煤末、焦粉进行了配制浆研究，不同煤配煤制浆结果有较大的差异，添加剂对配煤制浆同样具有选择性。利用配煤技术可以有效的降低淮南煤的灰熔融性温度。     

Choosing parameters of design elements of an impulse seismic source

Based on the analysis of actuation of an impulse seismic source, the formulas are presented for calculating the motor impulse stroke length, and weights of the seismic vibrator and swamp block, that can be used in the seismic source designing.     

如何提高采区斜坡道光面爆破的效果

阐述了光面爆破的重要性,并对其爆破所涉及到的诸多因素进行了分析,使光面爆破达到最佳爆破效果。     

优化钻孔参数提高采区瓦斯抽放效果

针对杏花煤矿煤层透气性低,采前预抽难以实施的实际情况,介绍了杏花煤矿利用采动卸压抽放瓦斯技术及采煤工作面治理瓦斯的成功经验,取得了明显的安全效益和经济效益,对其他类似矿山有借鉴作用。     

悬臂式掘进机在地铁施工中的应用

文章介绍了EBJ-120TP型掘进机在广州地铁3号线天河客运站的施工情况,初步摸索出一套悬臂式掘进机在地铁施工中的施工工艺。进而分析了施工中存在的问题,并提出对新一代掘进机的改进方案。     

薄煤层提高块煤率的爆破参数优化

为提高薄煤层开采中的块煤率，基于控制爆破技术原理，提出了“大孔距装药，密集孔导向成缝，挤压孔超深微差起爆”，设计了爆破参数试验方案，经试验块煤率得到显著提高。     

采煤机螺旋滚筒装煤性能研究及其参数优化

在理论研究的基础上 ,将影响采煤机装煤性能的 4个主要因素即滚筒叶片直径、滚筒转速、螺旋叶片内、外螺旋角做为设计变量 ,滚筒装煤生产率为目标函数进行了优化设计 ,并进行了分析。     

城市立交道路排水方案的选择

从设计的角度就立交道路排水设计特殊性、复杂性及繁琐性的特点,结合具体工程实例,从立交道路的排水任务、排水方式以及所遵循的设计原则等方面进行分析和论述,总结了城市立交道路排水方案选择的一般规律,具有一定的借鉴价值.     

Effects of the rock mass parameters on the dragline excavation performance

This paper investigates impacts of rock mass properties on dragline performance. Performances of two draglines operated in different rock formations in Tuncbilek Coal mines were analyzed using modified geological strengths index (GSI). Results showed that draglines’ performance change with the rock mass properties. Based on the available data, an empirical relationship was generated to estimate dragline production capacity. The estimated excavation amount by the proposed model was found to be consistent with the excavation amount obtained from the field data.     

有机磷(膦)类萃取剂的量化指数计算方法的选择

随着密度泛函理论的发展,密度泛函(DFT)方法能计算出比较精确的物质微观结构信息,广泛用于计算分子的量化信息。简要综述了密度泛函理论的基本框架及其发展过程,介绍了基组选择的方法,探讨了基组对机磷(膦)类萃取剂计算结果的影响。采用密度泛函理论的B3LYP方法,在6-31+G(d,p)、6-31+G(d)、6-31 G(d,p)、6-31 G(d)、6-31+G基组下,分别对二(1-甲基己基)膦酸(P215)进行了几何结构全优化,考察了不同基组对键长、振动频率、总能量、CPU使用时间的影响,发现键长对计算条件不太敏感,在6-31 G(d,p)水平上计算出的振动频率更接近实验值,总能量最低,结构最稳定,CPU耗时适中。分析结果表明,采用B3LYP/6-31+G(d,p)研究有机磷(膦)类萃取剂原子的键长、红外光谱等量化指数的变化规律是比较合适的方法。     

合理选择爆破方案,减小煤炭损失与贫化

针对露天矿采煤工作面在采至煤岩接触带时易造成煤炭损失与贫化的现象。就几种不同情况,提出不同的穿孔爆破方案,以尽量减小煤岩的混杂程度,从而达到减小煤炭损失与贫化的目的。     

如何利用创新改进成本管理

如何利用管理创新和技术创新来改进成本管理,提高企业效益。     

Effects of hydrodynamic parameters on entrainment and flotation performance

The separation selectivity and efficiency of the flotation process depends not only on differences in the physico-chemical surface properties of various minerals within an ore, but also on the hydrodynamics of flotation. The hydrodynamics relate directly to many sub-processes of the flotation, such as suspension of particles in the pulp, dispersion of the air into bubbles and the probability of particle–bubble collision. Mechanical entrainment plays a major role in the quality of the flotation concentrate and the separation selectivity. Therefore, the effects of some important hydrodynamic parameters on both the entrainment and the flotation performance were investigated by means of a fractional factorial experimental design. Furthermore, many flotation tests were performed in order to generate sufficient data for use in empirical modelling and neural network based modelling, in light of the results of the experimental design. The adaptability and reliability of the models developed, depending on the treatment of available experimental data, have been studied comprehensively. Evaluation of the observed and predicted results demonstrated that the effect of some chemical and hydrodynamic parameters of the flotation process on both the metallurgical performance and entrainment in the training region, can successfully be predicted, with an error of less than 6%, by using the developed neural networks models without particular assumptions and additional experiments. In order to prove the validation of the empirical and neural networks models developed and to compare their performances, a few additional tests were conducted under predetermined flotation conditions. The results of these additional flotation tests indicated that the neural network models were consistently more accurate than the empirical models with a negligible error.     

浅谈如何提高商品煤人工采样精密度

讨论了影响煤炭采样、制样和化验精密度的诸多因素,根据国标GB 475-2008和GB474-2008提出了从采样、制样及化验等环节提高采制化精密度的相关注意事项.