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1.
不同实验装置测定粉尘湿润剂的湿润效果相关性   总被引:8,自引:1,他引:7  
采用滴液法、正向渗透法和反渗湿润法分别研究了3种阴离子型湿润剂对10种硫化矿粉尘的湿润效果,比较了不同实验装置研究湿润剂湿润粉尘的相关性.结果表明:温度约20℃时,使用上述3种实验方法对相同的试剂和粉尘做湿润实验没有相关性,许多情况下还出现完全相反的结果;而对于相同的实验装置,3种湿润剂都具有较好的相关性.由此可以看出,实验室研究湿润剂所采用的方法在原理上要与应用现场的特征相适应,否则就将适得其反.  相似文献
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Wetting agent investigation for controlling dust of lead-zinc ores   总被引:3,自引:0,他引:3  
The purpose of this project is to control the pollution of dust,which occurred in a typical lead-zinc mine.Two kinds of surfactants and water glass were chosen as the wetting agents to study the behaviours of suppressing the dust.The performances of the wetting agents of various sizes and water content of dust and their compositions among different weting agents were investigated. Firstly,the chemical compounds,dispersity,water content,bulk density and other relevant physico-chemical properties of the choiced dust of lead-zinc ore were mensurated.A great number of down-ward penetrating tests were conducted to different partical sizes of dust and to analyze the dust wetting behaviour respectively.The optimal compositions of wetting agents were obtained in accordance with different water contents and partical sizes of the dust after analyzing and statisting the achieved experimental data. The data show that the efficiency of chemical dust suppression of weting agents is much better than that of water.The results of the research work prove that the partical size and the water content of the dust are very important factors to the dust suppression.The results are also proved validly by the dropping experiment,which takes the penetrating diameter and penetrating time as the major factors.The superfine dust is much more difficult to be wetted.Since increasing the water content of dust is the best approach to control it,the choice of wetting agents for improving dispensation is significant.  相似文献
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Spontaneous combustion is one of the serious problems in the mining of sulfide ore deposits. The relevant factors, e.g. oxygen absorption quantity, mass increase, contents of water soluble iron ions and sulfate ion of sulfide ore samples in the oxidation process were investigated both in theory and experiment. The results from the investigation show that there is no general interpretation relation among the oxygen absorption quantity, the contents of sulfate ion and water soluble iron ions during the oxidation process of sulfide ores at ambient temperature. However, there is a linear relationship between the mass increase of the sulfide ore samples in the oxidation process at ambient temperature and the quantity of oxygen absorption. Therefore, the simple and cheap mass scaling method is suitable for predicting the oxygen absorption performance of sulfide ores at ambient temperature in place of the expensive and complicated chemical method used hitherto. Furthermore, combined with other items of breeding-fire test, the mass increase potential can also be used to predict the spontaneous combustion tendency of sulfide ores.  相似文献
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应变速率对TA15钛合金β热变形动态再结晶组织的影响   总被引:1,自引:0,他引:1  
采用THERMECMASTER-Z型热模拟实验机对TA15钛合金在变形温度1050℃,应变速率0.001s-1~1s-1,真应变0.03~1.2范围内进行了等温恒应变速率压缩实验。结果表明,提高应变速率能够明显细化晶粒,在低应变速率(0.001s-1,0.01s-1)下,提高应变速率对晶粒细化的程度较大;从晶粒细化效果及组织均匀性考虑,较佳的应变速率为0.01s-1。  相似文献
5.
根据采矿工程是庞大复杂的岩土工程的事实 ,研究了采矿与岩土工程学科的知识体系、人才培养计划、就业的相通性 ,将“采矿工程”专业拓宽为“采矿与岩土工程”专业 ;在近十年里对原采矿工程专业的培养计划、课程、教材进行了改革和建设 ,培养了一大批复合型学士、硕士和博士 ;证明了采矿工程人才和岩土工程人才可双向流动和两个专业的可合并性 ;通过改革 ,也拓宽了采矿专业教师的知识和科研领域 ,提高了实验室利用率 ;从而保证了中南大学采矿学科在多年大环境不利的形势下 ,不仅得以生存而且得到较大发展  相似文献
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本文通过焊接锅炉管中频感应热处理的试验与生产,分析了中频感应加热正火对管材组织与性能的影响。中频感应加热能有效地改善金属组织,具有工件氧化少,生产效率高,变形小,晶粒细等优点,适用于特殊用途的焊接钢管热处理。  相似文献
9.
吴超 《轧钢》2000,17(2)
最近 ,清华大学摩擦学国家重点实验室与通利实业贸易公司合作开发出一种新型测量仪器———“框架式结构自适应表面形貌仪”。该仪器采用独特的结构设计 ,与目前国内外使用的立柱式和便携式常规表面形貌仪相比 ,具有体积小、重量轻、结构简单、操作方便、测量速度快、精度高等优点。可用于凹凸体或旋转体等非平面形状试件的二维、三维表面形貌测量 ,尤其适用于对轧辊等大型或超大型部件的二维、三维表面形貌进行检测 ,并可在各种情形的现场进行测量。可以有效地避免因轧辊表面缺陷造成的钢板质量问题 ,大大提高产品合格率。该仪器目前已投入…  相似文献
10.
本文分析了老式主扇风硐的各部份压力损失的原因及其大小范围,并建议改用立式轴流式主扇和离心式主扇的布置方案。  相似文献
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