Iron improvement and silicon reduction beneficiation method of high ferrosilite and lean magnet iron ore

Abstract

The invention discloses an iron improvement and silicon reduction beneficiation method of high ferrosilite and lean magnet iron ore, the method comprises the following processes of crushing-screening,fine crushing, dry-type preconcentration tailings discardinghigh-pressure roller milling, coarse particle magnetic separation, and coarse particle magnetic separation concentrate rough grinding-low intensity magnetic separation, wherein coarse crushing is arranged underground, medium and fine crushing are arranged on the ground, the placement is reasonable and orderly, reducing of occupied spaceis facilitated, and transporting and lifting of ore from the downhole is convenient. The dry-type preconcentration tailings discarding is carried out on sieve residue and through product after intermediate crushing and fine crushing, mixed barren rock is thrown out, throwing out is carried out and rough gangue and block gangue used as building products are recovered in advance, the iron grade of follow-up separating operations is recovered and improved, the ore content given to the follow-up operations is greatly reduced, " receiving early and losing early" is realized. The feeding grain sizeof high-pressure roller milling is up to 30mm, a precedent is broken, characteristics of low energy consumption and high processing capacity of a high-pressure roller milling machine is fully played,a product stock heap is not arranged in design, and occupied space and dust pollution are reduced.

Description

technical field [0001] The invention belongs to the technical field of iron ore beneficiation, and in particular relates to a magnetite ore beneficiation method, which is especially suitable for iron silicate content ≥ 6%, surrounding rock mixing rate of 8% to 15%, and iron grade of 28% mined from underground mines. Energy-saving beneficiation of magnetite-poor ore in the range of ~32%. Background technique [0002] The main characteristics of my country's iron ore are "poor", "fine" and "miscellaneous". The average iron grade is 32%, which is 11 percentage points lower than the world average grade. Among them, 97% of the iron ore needs to be processed, and the complex and difficult-to-select red iron ore accounts for a large proportion, accounting for about 20.8% of the iron ore reserves. [0003] Poor magnetite ore has the characteristics of low selection grade, large beneficiation ratio, relatively difficult grinding and selection, and low resource utilization rate. In a...

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Problems solved by technology

However, this patent is to perform dry magnetic separation on the screened products after ultra-fine crushing (high-pressure roller mill crushing) - high-strength magnetic separation and throwing tailings, and it still does not achieve "throwing early throwing, early harvesting and early harvesting" "The principle of energy saving, and the dressing plant covers a large area

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