共查询到18条相似文献,搜索用时 109 毫秒
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超细粉碎技术现状及发展趋势 总被引:3,自引:0,他引:3
综述了国内外超细粉碎技术及设备的现状、进展 ,指出了发展趋势。超细粉碎是物料深加工中的难题 ,也是粉体技术中的关键 ,它对现代工程技术的发展起着重要的作用。自 4 0年代以来 ,超细粉碎技术已取得了显著进步。目前 ,国内外用于实际生产中的超细粉碎设备主要有高速机械冲击式磨机、气流磨、介质搅拌磨、振动磨等设备 ,并从工作原理、结构特点等方面详细介绍了其典型设备。同时又指出了近年来国内外在此领域中的新进展。最后 ,基于现存问题指出了今后超细粉碎研究方向 相似文献
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超细粉碎技术现状及发展趋势 总被引:3,自引:0,他引:3
综述了国内外超细粉碎技术及设备的现状,从工作原理、结构特点等方面详细介绍了其典型设备,同时指出了近年来国内外在此领域中的新进展,并基于现存问题指出了今后超细粉碎研究方向。 相似文献
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本文介绍了超细重质碳酸钙在填料工业中的应用,并评述了目前干法超细粉碎设备的应用状况,着重介绍了新型干法超细粉碎设备-立式螺旋搅拌磨机超细粉碎重质碳酸钙的工业应用情况,指出立式螺旋搅拌磨机是一种高效节能的超细粉磨设备。 相似文献
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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。 相似文献
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In many laboratories and processing plants, different comminution equipment are used in preparing gold ores for gravity concentration. For malleable metals such as gold, particle shape changes in response to the forces applied during comminution, and these shapes can influence gravity concentration. In this study, the morphology of gold particles milled in different equipment was investigated. The disc and hammer mills generated cigar-shaped and globular particles respectively. The vibratory pulveriser created flaky particles while the ball mill formed a mix of flaky, folded and irregularly shaped particles. Gravity concentration produced enrichment ratios of 28.3, 24.0, 23.6 and 21.7 for the hammer mill, disc mill, ball mill and vibratory pulveriser respectively. The results show that the comminution equipment utilized should be taken into consideration in decisions regarding gravity gold recovery. 相似文献
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关于矿石粉碎特性参数及其测定方法 总被引:6,自引:0,他引:6
从粉碎工艺设计应用的角度,综述各种表征矿石粉碎特性的物料参数及其测定方法,包括用于传统碎磨设备选型计算的物料参数及其测定方法、用于自磨/半自磨流程设计的物料参数及其测定方法,以及用于高压辊磨流程设计的粉碎试验方法。 相似文献
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落重试验测定矿石粉碎特性参数 总被引:2,自引:0,他引:2
为了科学、准确地进行碎磨设备选型,并确定合理的碎磨工艺流程,对国际上较盛行的自磨/半自磨工艺中物料粉碎特性参数的测定方法——JKTech落重试验法进行了系统介绍,在此基础上,采用JK落重试验仪和磨蚀粉碎试验设备,测定了承德某铁矿3个矿样的冲击粉碎参数A和b以及磨蚀粉碎参数Ta。将试验结果与数据库数据比较,可以得出:13个矿样的粉碎特性十分接近,都属于软-中软矿石。2矿样在破碎能为2.5、1.0 kWh/t时,颗粒的抗冲击破碎能力随颗粒粒度的增大而下降,且破碎能越大颗粒抗冲击破碎的能力下降越显著;当比破碎能为0.25kWh/t时,颗粒的抗冲击破碎能力随颗粒粒度的增大而上升,即随比破碎能下降,颗粒粒度-t10关系曲线的斜率变小。3试验结果可以成功用于磨机与破碎机处理量和能耗的计算以及自磨/半自磨流程设计和模拟计算。因此,JKTech落重试验所测得的粉碎特性参数不仅可以判断矿石性质,也可作为设备选型和流程确定的依据。 相似文献
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Sepehr Sadrai John A. MeechDesmond Tromans Farrokh Sassani 《Minerals Engineering》2011,24(10):1053-1061
In mining operations, comminution processes are responsible for most of the energy used during mineral recovery. Low fragmentation efficiency of comminution in the range of 1-2% (Tromans, 2008) occurs due to the quasi-static nature of the process which is typically accompanied by low impact velocities. Accurate estimation of efficiency requires a measurement system to account for fractal parameters such as surface roughness and fracture surface area. Continuum breakage models of single particles fail to estimate the actual stress transformation that affects bulk material during comminution. In order to study comminution in a dynamic regime at higher strain rates than those of conventional equipment, a compressed-air apparatus designed to launch a projectile at velocities as high as 450 m s−1 has been developed to measure the quantitative nature of high-speed impacts on aggregated rock samples. A method to calculate the energy efficiency is also presented. The results of experiments conducted on three materials suggest the energy efficiency of rock breakage can be improved by two or three times under high velocity impact for the same energy input level. The paper reports an empirical model of impact velocity and energy input and discusses the advantages and limitations of this model. 相似文献
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The total energy consumption for ore comminution will further increase within the next decades. One contribution to minimise the increase is to use more efficient comminution equipment. Vertical-roller-mills (VRM) are an energy-efficient alternative to conventional grinding technology. One reason is the dry in-bed grinding principle. Results of extensive test works with two types of magnetite iron ores in a Loesche VRM are presented here. Within these test works, mill parameters like grinding pressure, separator speed and dam ring height were varied, following a factorial design of the experiments. The effects of the grinding parameters on the liberation of valuable minerals are characterised using mineral liberation analysis (MLA). It is shown how the different mill parameters influence important performance values like energy consumption, production rate and mineral liberation. Via multiple regression analysis, an optimal parameter range can be modelled for both ore types. The parameter predictions have been successfully verified in practical test works. 相似文献
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球磨机是粉碎过程中应用最为广泛的磨矿设备,通过建立数学模型,优化了球磨机结构、工作条件、物料性质和磨矿性能之间关系,提高粉碎和磨矿效率,研究了多元线性回归在球磨机中的应用。 相似文献