Magnetite crushing, pre-separating and mineral milling process

Abstract

The invention relates to a magnetite crushing, pre-separating and mineral milling process which comprises a crushing and dry separating operation. The magnetite crushing, pre-separating and mineral milling process is characterized by further comprising a closed-loop roller milling operation, a pre-separating operation and a closed-loop tower milling operation; the closed-loop roller milling operation is performed through a high-pressure roller mill and a vibration screening machine; the pre-separating operation is performed through a dry pre-separating magnetic separator; and the closed-loop tower milling operation is performed through a tower mill and a swirler. According to the magnetite crushing, pre-separating and mineral milling process, a crushing and dry separating operation productof which the particle size reaches negative 30 mm is treated through the above three operations in sequence; a process product of which the particle size reaches negative 0.074 mm and the content reaches 85% to 95% is obtained; and the particle size requirements of follow-up selective operations are met. The magnetite crushing, pre-separating and mineral milling process provided by the inventionhas the following advantages: (1) the mill feeding particle size is reduced from negative 12 mm to negative 3 mm, the mill feeding grade is improved by 5% to 10%, and the mill feeding amount is reduced by about 20%; and (2), the fine crushing operation burden is greatly relieved, the existing mineral milling process is simplified, the capital construction investment is greatly reduced, the mineralseparating cost is reduced, the energy is saved, the consumption is lowered, and the significant economic benefits are achieved.

Description

technical field [0001] The invention belongs to the field of mineral processing technology, and in particular relates to a magnetite crushing-preselection-grinding process which reduces the crushing burden and simplifies the grinding process. Background technique [0002] In the mineral processing industry, ore crushing and grinding operations are preparatory operations for the separation operation. Its task is to provide selected materials with qualified particle sizes for the mineral processing operation. Dissociation, and over-crushing should be as slight as possible to facilitate subsequent sorting operations. At present, the ore concentrators processing Anshan-style magnetite ore in my country usually adopt the technological process of "coarse crushing, medium crushing, closed-circuit fine crushing and screening, magnetic pulley dry separation, two-stage grinding or three-stage grinding" to provide suitable equipment for the sorting operation. selected materials. The s...

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Problems solved by technology

[0003] For Anshan-type magnetite, the traditional process of "three-stage and one closed-circuit crushing-magnetic pulley dry magnetic separation and tailings-two-stage grinding or three-stage grinding" is used to prepare suitable selected materials for the sorting operation. Obviously, there are the following Several problems and deficiencies: 1) The number of grinding stages is large, and the technological process is complicated and lengthy; 2) The investment in equipment and machine infrastructure is high, and the production and operation costs are high, accounting for about 55% of the total cost of beneficiation. About 60%, 3) The production site environment of crushing and grinding operations is harsh, and the dust and noise pollution is serious

[0008] Chinese patent CN203620745U discloses a utility model patent of "an ultra-fine stirring mill system", and invented an open-circuit tower mill grinding system, which solves the problem of non-metallic ore grinding mainly using dry grinding equipment in the grinding process. Disadvantages such as high noise, low production efficiency and uneven particle size distribution

[0009] The application of new crushing and grinding equipment plays a vital role in the technological progress of the concentrator, but it is not ideal. It is only the application practice result of a new type of equipment replacing the existing equipment, and there is no joint application of several new types of equipment. To try, it is necessary to propose new technical solutions for further innovation and improvement

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