Quality improvement and impurity reduction mineral separation method and device for low-grade micro-fine particle inlaid magnetite

Abstract

The invention discloses a quality improvement and impurity reduction mineral separation method and device for low-grade micro-fine particle inlaid magnetite, and belongs to the technical field of mineral separation. The method comprises the steps that firstly, the low-grade micro-fine particle inlaid magnetite is subjected to high-pressure roller milling and screening, minus sieve products after screening are subjected to rough particle wet type preliminary selection, and preliminary selection concentrates and preliminary selection tailings can be obtained; and the obtained preliminary selection concentrates are subjected to three-segment ore grinding grading and three-segment efficient magnetic selection, and obtained third-segment efficient magnetic separation concentrates are final ironconcentrates. The device comprises a belt conveyor, an intelligent blockage removal stock bin, a hopper, a high-pressure roller mill, an efficient fine powder screen, a permanent magnet wet type rough particle preliminary selection magnetic separator, a water removal screen, a hydrocyclone, an efficient permanent magnet wet type magnetic separator, a pump pond, a slurry pump, a tower mill, a concentrate pressure filter machine, a tailings throwing pipe, a main tailings pipe and a ball mill. The method and device have the advantages of being green and environment friendly, good in flow adaptation, good in stability, capable of obviously improving the iron concentrate grade, and capable of achieving efficient recycling of the low-grade micro-fine particle inlaid magnetite.

Description

Technical field: [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a mineral processing method and device for upgrading the quality and reducing impurities of low-grade fine-grained magnetite. Background technique: [0002] Iron ore is the most widely used and consumed metal mineral in the world. It is the "food" of the iron and steel industry and the "blood" of the development of modern industry. my country's iron ore resources are rich in lean ore and less in rich ore, and its main characteristics are "poor", "fine" and "miscellaneous", and the average iron grade is low. With the rapid development of my country's iron and steel industry, the demand for finished iron ore is increasing, the amount of easy-to-select iron ore that can be mined and utilized is gradually decreasing, the objects of mineral processing are increasingly diluted, and the iron minerals in the ore gradually tend to be fine-grained- The characteristi...

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Problems solved by technology

However, in practical application, the above-mentioned process has the following problems: (1) The original ore finely crushed products of magnetite need to be all put into the grinding, the grinding amount is large, the energy consumption is high, and the ore dressing cost is high; (2) The stage grinding-single Magnetic separation process, although the process is simple, but there is uneven distribution of grinding particle size in the fine grinding stage, minerals are prone to incomplete dissociation or over-grinding, and the concentrate grade cannot be effectively improved; (3) reverse flotation is used for concentrate extraction Although better beneficiation indicators can be obtained, the consumption of beneficiation chemicals will increase production costs, and the chemicals will have a certain impact on water resources; (4) adding elutriation machines for magnetic separation concentrates will increase the corresponding High water and electricity consumption, high operating costs, and the middle ore produced by the elutriation machine will continue to return to the process

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