Beneficiation method for stepped recovery and segmented tailing discarding of low-grade chromite

Abstract

The invention discloses a beneficiation method for stepped recovery and segmented tailing discarding of low-grade chromite, and the technological process of high-pressure roller grinding, coarse grain wet-type strong magnetic pre-concentration, ore grinding, wet-type strong magnetic tailing discarding, strong magnetic concentrate thickness grading, spiral chute refining and middling table re-concentration is researched and developed. A high pressure roller mill is adopted as ultrafine crushing equipment, and has the characteristics of large crushing ratio, low energy consumption, high product fine fraction content and the like; and the pre-selected tailings can be sold as building material products due to relatively large granularity. According to the beneficiation method for the stepped recovery and segmented tailing discarding of the low-grade chromite provided by the invention, a wet-type strong magnetic one-roughing and one-sweeping pre-selection process is adopted, so that the treatment granularity is fine, the adaptability is high, the tailing discarding yield is high, and the metal loss rate is low. The low-grade chromite with the Cr2O3 grade being 19.44% is treated through the method, the chromium concentrate with the Cr2O3 grade being 43.87% and the Cr2O3 recovery rate being 67.28% can be obtained, and the method has the advantages of being large in system treatment capacity, large in coarse grain tailing discarding yield, high in adaptability, capable of saving energy and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of chromite ore beneficiation, in particular to a method for beneficiation of low-grade chromite ore, especially suitable for Cr 2 o 3 Sorting of chromite with grade ≤20%. Background technique [0002] Chromium is a scarce strategic resource in my country. For a long time, it has mainly relied on imports to solve domestic supply problems, and its dependence on foreign countries has reached more than 90%. With the sustained and rapid development of the national economy, my country's consumption demand for chromite continues to grow, and the gap between supply and demand continues to widen. In order to meet the demand of domestic chromite ore, in recent years, many enterprises have gone abroad to acquire or cooperate in the development of foreign chromite ore resources, but the chromium ore mines purchased have low chromium grade and are difficult to beneficiate. [0003] At present, the beneficiation proce...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems existing in the prior art such as high mineral processing cost, large amount of fine-grained tailings, small equipment processing capacity, large floor area, large water consumption or complicated equipment operation, large investment, many types of chemicals, To solve the problems of strong pollution of wastewater, and to provide a beneficiation method of cascaded recovery and staged tailings of low-grade chromite with large system processing capacity, high yield of coarse-grained tailings, strong adaptability, energy saving and environmental protection

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