Magnetite High Pressure Roller Mill Wet Pre-Separation-Stage Grinding-Fine Screen Tower Mill Magnetic Separation Process

Abstract

The invention relates to a magnetite high compression rolling wet pre-concentration-stage grinding-fine screen tower rolling magnetic separation process. The process comprises coarse breaking and mildbreaking, and is characterized by further comprising the following steps that ores with the grade being 30%-32% and the granularity being -25mm are subjected to closed circuit high compression rolling; rolling products are subjected to beforehand magnetic separation; premagnetization concentrates are subjected to first-stage closed-circuit grinding; primary overflow is subjected to first-stage magnetic separation; first-stage magnetic separation concentrates are subjected to second-stage closed-circuit grinding; secondary overflow is subjected to second-stage magnetic separation and fine screening; screen residues are subjected to third-stage closed-circuit tower milling and grinding; third-time graded overflow products are graded by a third-stage magnetic separator; concentrates of the third-stage magnetic separator and screen underflow products are subjected to fine magnetic separation to obtain 67%-67.5% final concentrates; and tailings of all stages of magnetic separation work arecombined to be combined tailings. The magnetite high compression rolling wet pre-concentration-stage grinding-fine screen tower rolling magnetic separation process has the advantages that (1) high compression rolling pre-concentration is conducted, so that the particle size of grinding feed is reduced, and the grade of crude ores and grinding fineness are improved; (2) a cyclone and a tower millare combined, so that one stage of fine screening and multiple stages of magnetic separation operation are omitted; (3) the flow is simplified, and the ore mineral separation cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of beneficiation, and in particular relates to a magnetite high-pressure roller grinding wetting machine with simplified technological process. [0002] Formula pre-selection-stage grinding-fine screen 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...

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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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