How to choose the crushing method of ore
According to the provisions of the original release in 1980 the Ministry of coal industry technical guidance document, the evaluation method of process effect of crushing equipment in coal preparation plant (MT / Z2 - 1979), should be used as the main index of fine crushing efficiency, increment as auxiliary indexes, comprehensive evaluation of the effect of crusher.Crushing efficiency; press calculation:Granular incremental push down calculation:The "fine grain" here is aimed at the size of the broken product:When the particle size requirement is greater than and equal to 50 mm of coarse crushing, "fine grain" means 0~13 mm;Nesting granularity requires less than 50 mm of medium crushing and fine crushing, and "fine grain" means 0 ~ 0.5 mm.
The magnitude of the resistance to external forces in the process of ore breaking is known as the degree of ore fragmentation. The value depends mainly on the structural characteristics of minerals and the crystalline morphology of minerals, and is a reference standard to measure the fragmentation of ores.In the production process, the main factor affecting the degree of ore fragmentation is the hardness of the ore itself.
Ore crushing method is mainly based on the physical and mechanical properties of ore, the size of ore block feeding and the required crushing ratio and other factors to determine.The beneficiation industry usually refers to the coefficient of fragmentation and quantitatively measures the effect of mineral mechanical strength on crushing work. The method is expressed as follows:Epsilon coefficient of material in formula;Qo - the processing capacity of hard ore in the crushing of a crusher;Q1 - the crushing capacity of the same crusher to crush the specified ore under the same conditions.The medium hard ore is usually represented by quartz, and its grindability coefficient and grindability coefficient are both 1.
