The effects of electrical comminution on the mineral liberation and surface chemistry of a porphyry copper ore

The surface chemistry and mineral liberation changes of a porphyry copper ore after high voltage pulse (HVP) electrical comminution have been investigated using X-ray photoelectron spectroscopy (XPS) and mineral liberation analysis (MLA). Previous studies suggest that electrical comminution has the potential to improve downstream flotation recoveries, due to increased mineral liberation. However, until now the effects on the surface chemistry have not been investigated in detail.The mineral liberation results showed that chalcopyrite was more liberated in the electrical comminution product than in mechanical comminution, noticeably in the coarser size fractions. The surface chemistry of pure chalcopyrite was investigated, using XPS, and high resolution scans of iron and sulphur showed that both comminution methods led to iron oxidising preferentially leaving behind a passivating film of copper sulphides. However, the HVP product oxidisation was more severe with more iron oxide being produced and further oxidation of the remaining copper sulphides into copper sulphate. An attrition grinding stage may be useful in removing the oxidised layer from the surface of the particles prior to flotation separation. This paper presents a new application of the HVP technology in hybrid procedures using electrical comminution and mechanical grinding to prepare the flotation feed, rather than using excessive pulse energy to fully disintegrate ore to the flotation size. Better liberation and flotation performance were achieved through the hybrid procedures than the comparative mechanical comminution.     

高压水射流技术粉碎原盐的研究

以原盐为被粉碎研究对象,通过对高压水射流粉碎原盐形貌的观察和成分分析、高压水射流原盐粉碎性能分析,以及高压水射流粉碎原盐各影响因素的正交分析,研究表明高压水射流粉碎技术对原盐具有良好的解理性且粉碎效率高、耗能低。各因素对原盐粉碎效果的影响顺序为:射流压力卤水喷嘴直径、料液混合喷嘴直径、靶面形状。     

石英砂物料气流冲击粉碎效果影响因素分析

通过对石英砂物料在不同实验条件下的粉碎结果分析，论述了流化床式超细气流粉碎机工艺参数对产品粒度的影响。     

矿岩粉碎全过程能耗-粒度关系的连续损伤理论研究SCIEI

本文从连续损伤理论的观点出发,将矿岩粉碎过程描述为在外部荷载作用下矿岩颗粒内部微缺陷(损伤)演化和繁衍的过程。导出了粉碎能耗与产品粒度分布的理论表达式。该式包含了所有传统的理论,同时较传统的能量分配观点前进了一步。     

CGM60-B锥摆式搅拌磨的研制

介绍了新型搅拌磨CGM60-B锥摆式搅拌磨的工作原理和主要结构.与普通搅拌磨相比,该机由于搅拌锥周期性的偏摆,增加了对物料的挤压、剪切和磨损使其磨粉效率大为提高,同时,与同等容积的搅拌磨相比,具有较大的输出功率,另外该机采用独特的中心冷却方式,其效果要比外层冷却好得多.     

利用震动磨超细粉碎天然羟基磷灰石

本文利用震动磨对羟基磷灰石进行超细粉碎,优选出震动磨超细粉碎的最佳工艺条件。利用震动磨研磨可以得到粒度分布单一的粉体样品,D50为2.001μm。     

ANALYSIS OF DISSIPATIVE STRUCTURE IN MATERIAL COMMINUTION

ＡＮＡＬＹＳＩＳＯＦＤＩＳＳＩＰＡＴＩＶＥＳＴＲＵＣＴＵＲＥＩＮＭＡＴＥＲＩＡＬ　ＣＯＭＭＩＮＵＴＩＯＮＺｈａｎｇ；Ｚｈｉｔｉｅ（ＤｅｐａｒｔｍｅｎｔｏｆＭｅｃｈａｎｉｃａｌＥｎｇｉｎｅｅｒｉｎｇ，ＣｅｎｔｒａｌＳｏｕｔｈＵｎｉｖｅｒｓｉｔｙｏｆＴｅ...     

超微粉碎小麦的蛋白质变化探讨

采用自行设计制造的CH—300型机械冲击式粉碎机对小麦进行粉碎加工、分级，通过工艺参数调整，选出两种加工分级后的产品进行分析，结果表明：加工后的小麦平均粒径可达5．85μm，形貌呈球对称状；其蛋白质含量随粒径变细而增加，当D9小于10μm时，蛋白质含量骤然增大一倍多，从而为小麦的特殊使用要求提供了深加工的途径。     

Influences of different comminution methods on maceral segregations,ignition, and pyrolysis of superfine pulverized coal

The same bituminous coal is grinded by three representative grinding systems, respectively. Tendencies of maceral segregations in three systems are analyzed. The influences of maceral segregations on ignition temperatures and flash pyrolysis products are compared and discussed.     

HS辅助液压盘式磨机的开发与应用

详细介绍了HS辅助液压盘式磨机的主要结构组成、工作原理、结构特点、主要技术参数；对粉磨分级系统、循环通风系统、控制系统等主要组成系统的选择、设计及其注意的问题进行了论述；给出了该磨机的适用范围和应用实例。该磨机节能降耗，是替代球磨机、雷蒙磨等的理想产品.