Fluorite lean ore color sorting upgrading-tailing pre-sorting method

Abstract

The invention provides a fluorite lean ore color sorting upgrading-tailing pre-sorting method. The method comprises the following steps that (1) fluorite lean ore is crushed through two sections of closed circuits, and crushed products are -15 mm; (2) the crushed products are screened to obtain oversize products and undersize products, wherein the size of sieve pores is 5 mm, and the oversize products enter a first section color sorter for fluorite upgrading and sorting to obtain lump ore concentrates; (3) tailings sorted through the first section of color sorter enter into a second-section color sorter for tailing discarding sorting to obtain lump ore tailings and lump ore middlings; and (4) the undersize products in the step (2) and the lump ore middlings in the step (3) are mixed and ground, and then flotation is conducted. According to the method, the raw ore amount entering a ball mill is greatly reduced by pre-upgrading and sorting and pre-tailings-discarding of a large quantityof hard minerals, so that the beneficiation feed grade is improved, over-crushing of the hard minerals to the fluorite in the ore grinding process is reduced, so that the production cost is reduced, and the sorting quality is improved.

Description

technical field [0001] The invention relates to the technical field of fluorite mineral processing, in particular to a color separation and quality improvement-tailing pre-selection method for fluorite lean ore. Background technique [0002] Fluorite is one of my country's important strategic non-metallic minerals, known as the "second rare earth". my country is rich in fluorite resources, but the average grade is low, and most of them are associated fluorite mines, so it is difficult to sort and recover. Fluorite minerals are low in hardness and brittle, and have a large difference in hardness from gangue minerals such as silicates, and are prone to overgrinding and muddying, which is an important reason why it is difficult to obtain high-quality fluorite concentrates. At present, the main beneficiation methods of fluorite ore are hand selection, gravity separation and flotation. Hand selection is generally used for fluorite mines with clear boundaries between fluorite an...

AI Technical Summary

Problems solved by technology

Hand selection is generally used for fluorite mines with clear boundaries between fluorite and gangue and easy to identify with naked eyes. It can sort better quality fluorite lumps in advance to obtain qualified lump ore products, but the operation rate is low and the labor cost is high. Generally used as an auxiliary means for other sorting methods

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