Disintegratability Procedure for Geomaterials in Multiple Impact Crushing
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MINERAL DRESSING
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Disintegratability Procedure for Geomaterials in Multiple Impact Crushing A. I. Matveeva* and E. S. L’vova** a
Chersky Institute of Mining of the North, Siberian Branch, Russian Academy of Sciences, Yakutsk, Republic of Sakha (Yakutia), Russia *e-mail: [email protected] **e-mail: [email protected] Received March 2, 2020 Revised March 22, 2020 Accepted April 10, 2020
Abstract—The authors justify and exemplify the disintegratability procedure for geomaterials in impact crushing. The procedure distinguishes between two simultaneous processes of destruction and disintegration based on grading analysis of crushing products. The quantitative results on disintegration are obtained for metalliferous geomaterials of different texture and mineral composition. Disintegration is an important process of ore treatment, and disintegratability is an important characteristic of the process and the performance indicator of crushing equipment. Keywords: Crushing, crusher, dressing, size distribution, recovery, gold. DOI: 10.1134/S1062739120026769
INTRODUCTION
The current advance in ore processing and conversion technology with cost cutting of ore pretreatment is connected with simplification of process flow charts and with reduction of crushing and milling operations at ceased-off loads. The objective is met through the use of equipment of high reduction ratio and high capacity. These requirements are fulfilled by impact crushing machines [1, 2]. Dynamic disintegration of geomaterials in the mode of free high-velocity interaction with crushing and milling tools is associated with lower tensile strength of material, which is an undisputed advantage of destruction techniques based on rupture effect, including impact methods [3, 4]. Development of percussion grinder and rotary crushers prove this statement. These machines possess high capacity and ensure high reduction ratio. The use of these machines allows improving production data and economic performance of processing factories [5]. Efficiency of impact crushing and milling is governed by disintegration process. In ore pretreatment, disintegration is understood as dissociation of a complex compound geomaterial into parts, i.e. separate mineral phases, and into mechanically stronger components or fragments. Disintegration of geomaterials is a result of selective rupture of the weakest mechanical linkages which are inter-mineral and inter-grain connections. Mechanically, during fracture of solid by impact, the impact generates a complex field of stresses and strains of various value and orientation, and disintegration takes place. Sometimes the process can be described as spontaneous dispergation of a material with weak mechanical linkag
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