Ore benefication process for low-grade fine particle grade embedded distribution refractory iron ore

Abstract

The invention discloses an ore benefication process for low-grade fine particle grade embedded distribution refractory iron ore. The process comprises the following steps that crushed ore products are firstly subjected to one-stage ore grinding and one-stage grading, underflow after the grading is returned for re-grinding, and overflow is subjected to two-stage grading; underflow after the second-stage grading is subjected to second-stage ore grinding, ore grinding discharge materials are returned to the second-stage grading, and overflow is subjected to one-stage desliming; underflow after the desliming is subjected to three-stage grading and three-stage ore grinding, ore grading discharge materials are returned to three-stage grading, and overflow is subjected to second-stage desliming; next, three-section, four-section or five-section or more-section desliming is sequentially carried out; underflow after the desliming starts to be subjected to reverse flotation after the stirring, rougher flotation is firstly carried out, products in a groove after the rougher flotation are subjected to fine selection, foam products after the fine selection are returned to a rougher flotation groove, and products in a groove after the fine selection are concentrated and filtered to obtain ore concrete; and concentration machines and selective flocculation desliming processes are respectively adopted for each stage of desliming. The process provided by the invention has the advantages that the investment cost is low, the occupied area is small, the production and the maintenance are simple and convenient, the adaptability is high, the fine grinding desliming effect is good, and the like.

Description

Technical field [0001] The invention relates to a beneficiation process for ore, in particular to a beneficiation process for refractory iron ore. Background technique [0002] Iron is the most used metal in the world, and iron ore is the most important raw material for steel production. In recent years, with the substantial growth of my country's steel production, the demand for iron ore has increased rapidly, and the contradiction of domestic iron ore shortage has become more and more prominent. Under such a realistic background, encouraging the development of domestic iron ore resources, increasing the domestic iron ore self-sufficiency rate, and reducing the degree of dependence of my country's steel industry on foreign iron ore resources are the key to alleviating the current contradiction between supply and demand of iron ore resources in my country. [0003] However, the resource characteristics of iron ore in my country are many lean ore, many fine-grained distributions, a...

AI Technical Summary

Problems solved by technology

[0005] In terms of desliming, the existing cyclone is an efficient and simple desliming equipment, which has the characteristics of small equipment occupation, large processing capacity, and low investment. It is effective for removing slime with light density and fine particle size. However, the desliming effect of the cyclone is easily affected by the concentration and pressure of the feed, and the desliming effect is prone to fluctuations, and it is completely inapplicable for selective flocculation.

The simple desilting bucket has limited processing capacity and is not easy to control, so it is not suitable for large-scale mines

[0006] In short, due to the limitations of the existing fine grinding and desliming technologies, not only the useful minerals cannot be fully dissociated, but also the slime cannot be effectively removed, and thus cannot provide qualified raw materials for subsequent flotation operations. The flotation index is difficult to guarantee, and the purpose of developing and utilizing iron ore resources embedded with fine particles cannot be achieved

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