Mineral processing technology of low-grade fine-grained embedded refractory iron ore

Abstract

The invention discloses mineral processing technology for low-grade fine-grain embedded refractory iron ores. The mineral processing technology includes steps that ore products are subject to primary ore grinding and primary classification at first, bottom flow returns to be subject to primary ore grinding, run-over flow is secondarily classified, bottom flow generated after secondary classification is subject to secondary ore grinding, discharged materials return to be secondarily classified, run-over flow generated after the secondary classification is subject to weak magnetic separation, tailings generated after the weak magnetic separation are subject to concentration, slag isolation and strong magnetic separation treatment, and concentrates generated after the weak magnetic separation and the strong magnetic separation are subject to tertiary classification; bottom flow generated after the tertiary classification is further subject to tertiary ore grinding, discharged materials are subject to tertiary classification, run-over flow is subject to secondary desliming, bottom flow generated after the desliming is subject to weak magnetic rough separation, weak magnetic concentration, concentration and filtration to obtain iron concentrates, and tailings generated after the weak magnetic rough separation and the weak magnetic concentration are subject to tertiary or quadruple or higher-level desliming treatment; and bottom flow generated after the desliming treatment is subject to reverse flotation after middling concentration and stirring, and a product in a tank after flotation is concentrated and filtered to obtain iron concentrates. The mineral processing technology has the advantages of low investment, simplicity and convenience in maintenance, high adaptability, good fine grinding and desliming effects, and the like.

Description

technical field [0001] The invention relates to an ore beneficiation process, in particular to a refractory iron ore beneficiation process. 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 self-sufficiency rate of domestic iron ore, and reducing the dependence of the development of my country's iron and steel industry on foreign iron ore resources are the keys to alleviating the current contradiction between supply and demand of iron ore resources in my country. [0003] The iron ore resources in my country are characterized by a lot of lean ore, a lot of fine grai...

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

Images