Preselecting technology for extremely hungry hematite one-step classifying overflows through high gradient magnetic separator

Abstract

The invention belongs to the field of mineral separation technologies, and particularly relates to a preselecting technology for extremely hungry hematite one-step classifying overflows through a high gradient magnetic separator. The preselecting technology comprises the steps of processing raw ores-grinding the ores at a first section-classifying by one step-classifying based on the thickness; and the preselecting technology is characterized in that a) charging overflows of a whirlcone under the one-step classifying work to the high gradient magnetic separator to be processed, and returning sunken sand in the one-step classifying work to the one-step ore grinding work, so as to form a closed ore grinding section; b) charging concentrate processed by the high gradient magnetic separator into a thickness classifying work; and removing tailings which are subject to monomer separation under the high gradient magnetic separator. According to the preselecting technology provided by the invention, the high gradient magnetic separator is adopted to efficiently preselect low-level ores at a level of 10 to 20%, so that the level of the raw ores entering the thickness classifying work can be raised from 10-20% to 30-35%, and 40% of useless mines are removed, and therefore, the purpose of preselecting is achieved. The preselecting technology has a wide application prospect on hungry hematite and magnetite which have small crystallization granule size.

Description

technical field [0001] The invention belongs to the technical field of ore dressing, and in particular relates to a pre-selection process using a high-gradient magnetic separator for primary classification overflow of extremely poor hematite. Background technique [0002] In recent years, the development speed of my country's iron and steel industry is much faster than the growth rate of ore development. The domestic supply rate of iron ore is low, and the price of foreign iron ore continues to increase. The passion for beneficiation research and industrial development. The beneficiation process of low-grade iron ore is one of the goals of beneficiation development. [0003] The existing beneficiation process is: raw ore→one stage grinding→secondary classification→coarse and fine classification→stage grinding→gravity and magnetic anion reverse flotation process. When the grade of raw ore is between 25-30%, raw ore→one stage closed circuit mill is usually used →Primary gradi...

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Problems solved by technology

[0004] When dealing with low-grade Anshan-style lean hematite ore, the grade is between 15-20%, mining a section of closed-circuit grinding and grading overflow products, and directly feeding them into coarse and fine grading operations will increase the workload of subsequent stages of sorting , the amount of metal is reduced, and the energy consumption is high; in order to solve this problem, pre-selection is also used in current industrial applications. At present, most of the iron ore pre-selection adopts dry type and magnetic pulley pre-selection. Low-grade Anshan-type lean hematite with low magnetic rate

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