Magnetite high-pressure roller mill-wet type preconcentration-stage grinding-tower mill magnetic separation technology

Abstract

The invention relates to a magnetite high-pressure roller mill-wet type preconcentration-stage grinding-tower mill magnetic separation technology. The magnetite high-pressure roller mill-wet type preconcentration-stage grinding-tower mill magnetic separation technology comprises rough breaking operation and intermediate breaking operation and is characterized in that products obtained by the intermediate breaking operation are subjected to the following operations in sequence: closed-loop high-pressure roller mill-sieving operation formed by a high-pressure roller mill and sieving equipment, wet type preconcentration magnetic separation operation, one-stage closed-loop ore grinding operation, second-stage closed-loop ore grinding operation formed by secondary cyclone grading and a second-stage tower mill and continuous three-stage magnetic separation operation, so that final concentrate with the grade being 67%-67.8% and the yield being 38%-41% and integrated tailings with the grade being 8.5%-9.5% and the yield being 62%-59% are obtained. The magnetite high-pressure roller mill-wet type preconcentration-stage grinding-tower mill magnetic separation technology has the advantages that a high-pressure roller mill is used for preconcentration, so that the size of particles fed into the mill is reduced, and the grade of crude ore and the fineness of grinding are improved; the second-stage closed-loop ore grinding operation formed by the cyclone and the tower mill is adopted; the fine screening-regrinding operation is omitted; the fifth-stage magnetic operation is reduced; the technology process is simplified; and the beneficiation cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a magnetite high-pressure roller whose technological process is greatly simplified [0002] Grinding-wet pre-selection-stage grinding-tower mill magnetic separation process. Background technique [0003] In the mineral processing industry, the processing of magnetite ore usually adopts the process of "coarse crushing, medium crushing, fine crushing and screening, stage grinding-fine screen regrinding-single magnetic separation". The specific process is usually as follows: After the raw ore (1000-0mm) undergoes coarse crushing, medium crushing and fine crushing and screening, the particle size of the crushed product reaches 12-0 mm, and the medium and fine crushing and screening operations account for 25% of the beneficiation cost Or so, the cost is high, after the 12-0 mm crushed product passes through the closed-circuit grinding consisting of one-stage gr...

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Problems solved by technology

[0004] Magnetite adopts the process of "three-stage one closed-circuit crushing, stage grinding-fine sieve regrinding-single magnetic separation process". There are three stages of crushing in the crushing process, one stage of screening, and three stages of grinding in the separation process , two-stage fine screening operation, and nine-stage magnetic separation operation, there are obviously the following problems and deficiencies: 1) There are many crushing stages and sorting stages, and the process is complicated and lengthy; 2) The production operation control and management are inconvenient, especially in the sorting process A large amount of the second-stage fine sieve is returned to the re-mill for re-grinding, which may easily cause process instability and index fluctuations, which will affect normal production; 3) Disadvantages such as high beneficiation costs

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