Method for crushing iron ore

Abstract

The invention discloses a method for crushing an iron ore, comprising the following steps of primary crushing, ore washing and high pressure roller-milling, wherein the step of primary crushing uses a multi-level sieving cycling closed loop for crushing, and the step of high pressure roller-milling also uses a closed loop method; compared with the traditional crushing process flow, the process uses the production method of high pressure roller-milling scattering sieving closed loop process flow so that the range of the particle size of a final product is ensured to be narrow and the size thereof is uniform; the material in the final product of the ore is fully rolled and pressed by a high pressure roller miller so as to reduce the fineness of the material to the maximum degree, reduce the Bond index of the milling material, efficiently decrease the procedure energy consumption and steel ball consumption in milling operation and improve the selection index; moreover, the stable production process is ensured, the energy is saved and the consumption is reduced, much crushing and less milling are really realized, and the production capability of an ore factory is greatly improved.

Description

technical field [0001] The invention relates to a material crushing process, in particular to a crushing method of iron ore. Background technique [0002] Ore crushing is an important process step in metallurgy and mining. According to different product particle size requirements, different crushing equipment is used, and material selection steps such as screening are even added. In order to meet the requirements of the material particle size in the production process of the industry, the high pressure roller mill has been gradually researched and applied. At present, several production enterprises such as Jinduicheng Molybdenum Industry Company, Maanshan Iron and Steel Co., Ltd. and Shangqiao Iron Ore Concentrator have applied high-pressure roller mills in the ore crushing process of metal mines, and the specific methods are open-circuit process. (The open-circuit process refers to: the product after the material passes through the high-pressure roller directly enters the...

AI Technical Summary

Problems solved by technology

However, the trimming method cannot return all the coarse-grained minerals that have not been rolled by the high-pressure roller mill, and there are still "fish that slipped through the net"

Compared with the open circuit system configuration, the proportion of coarse particle products has dropped significantly, but the crushing is still incomplete, so the product particle size range is wide, the thickness is uneven, and the fine material grade (-3mm) material content is not high; Some of the materials still have not been fully rolled by the high-pressure roller mill, which cannot minimize the workload of the grinding operation and improve the selection index

Images