Low-grade magnetite pre-selection and waste abandoning mineral separation process

Abstract

The invention discloses a low-grade magnetite pre-selection and waste abandoning mineral separation process. The process comprises the following steps: carrying out coarse crushing, carrying out medium crushing, carrying out first-section sieving, carrying out first-section pre-selection and waste abandoning, carrying out fine crushing, carrying out ultrafine crushing, carrying out second-section sieving, and carrying out second-section pre-selection and waste abandoning. After raw ores are subjected to the coarse crushing and the medium crushing, three products are sieved by the first-section sieving; oversize products obtained after the first-section sieving is finely crushed through ore concentrate which is obtained by the first-section pre-selection and waste abandoning to form a fine crushing closed cycle; sized products obtained after the first-section sieving and the oversize products obtained after the second-section sieving are finely crushed and then are returned back to the second-section sieving to form an ultrafine crushing closed cycle; undersize products obtained after the first-section sieving and undersize products obtained after the second-section sieving are subjected to the second-section pre-selection and waste abandoning, and tailings in the first-section pre-selection and tailings in the second-section pre-selection are final tailings; and ore concentrate in the second-section pre-selection is a final product. According to the low-grade magnetite pre-selection and waste abandoning mineral separation process, a plurality of waste stones can be abandoned and the amount of ore entering a mill is reduced; the mill-entering grade of iron ores is improved, and the energy consumption and the consumption of steel balls can be reduced; and the development and the utilization of low-grade magnetite ores are facilitated, and the utilization rate of resources is expanded.

Description

Technical field [0001] The present invention is a crushing and pre -selected technology field, and specially involves a low -quality magnetite pre -selected mining process. Background technique [0002] my country's iron ore resources are characterized by: large resource reserves, but there are many poverty -stricken ore and less rich ore.The average iron of my country's iron ore resources is only 33%(the international iron ore export country is 55%~ 65%), the reserves of rich iron ore are less than 5%, and more than 95%of the poverty -stricken iron ore needs to be concentrated after the collection of rich and enrichment can only be concentrated. Send a high furnace smelting.In addition, the ore will mix a certain amount of surrounding rocks during the mining process.Therefore, the low -grade iron ore, such as crushing, grinding, selection, tailing and other processes such as crushing, grinding, selection, and tailing, and the surrounding rock is muddy during the milling process,...

AI Technical Summary

Problems solved by technology

The disadvantages of the existing technology are: after the raw ore is crushed in two or three stages, the ore particle size is still relatively large, and the dissociation degree of the ore is not enough, so it is difficult to achieve a satisfactory discarding effect

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