Double-reverse flotation method applicable to silico-calcium phosphorite

Abstract

The invention discloses a double-reverse flotation method applicable to silico-calcium phosphorite. According to the method, silico-calcium phosphorite is floated in a neutral medium; silicon-removed tailings are subjected to silicon removal twice and then floated; silicon-removed middlings are not returned; the silicon-removed middlings, silicon-removed coarse and refined ores are combined for floatation again for magnesium removal, so as to obtain a foamed product, namely, magnesium-removed tailings; products in a trough are phosphorus concentrates. The method avoids the influence of a fatty acid collecting agent on reverse flotation silicon removal through silicon removal and magnesium removal in sequence, so that the silicon removal sorting feature can be enhanced; the magnesium content of the silicon-removed middlings is higher; the silicon-removed middlings are combined with the silicon-removed coarse and refined ores for floatation for magnesium removal, and cannot be returned for floatation, so that the influence of slurry accumulation of the silicon-removed middlings on reverse flotation silicon removal is avoided; the silicon removal floatation process is stable and easy to operate; a floatation medium is neutral and weak in acidity; finally, the floated concentrates are easier to dehydrate in acidic slurry, and subsequent operation is facilitated.

Description

technical field [0001] The invention relates to a phosphate rock beneficiation method, in particular to a double reverse flotation method suitable for silicon-calcium phosphate rock. Background technique [0002] Among the proven phosphate rock reserves in my country, most of them are low-grade silicon-calcium-phosphate rock. At present, most phosphate ore concentrators in my country use single reverse flotation to process high-magnesium and low-silicon phosphate ore. This method is simple, has high carbonate separation efficiency, and realizes flotation at room temperature and low temperature. However, with mining, the reserves of high-magnesium and low-silicon ore are getting less and less, which may be exhausted in a few years, and it is imminent to solve the flotation of silicon-calcium phosphate ore. [0003] The double reverse flotation method is an ideal method for processing silicon-calcium phosphate rock. The double reverse flotation is composed of the reverse flot...

AI Technical Summary

Problems solved by technology

However, in most silicon-calcium phosphate rocks, the grade of the slime is only slightly lower than the grade of the original ore, and it is directly treated as tailings. The grade is high, and the loss of recovery rate is too large. If it is combined with the concentrate, the grade of the concentrate will drop Larger, can not meet the requirements of phosphate rock processing, this method can not be used in all silicon calcium phosphate rock

[0011] The above-mentioned methods and methods have a certain improvement effect in the double reverse flotation test of phosphate rock, but they cannot completely solve the problem of double reverse flotation of phosphate rock.

Especially in the extended continuous separation test, the return of a large number of desiliconized ore has a greater impact on the reverse flotation desiliconization

The existing double reverse method is to use fatty acid collectors to remove magnesium by flotation and then use cationic collectors to desilicate. The fatty acid collectors in the pulp after magnesium selection will float part of the glue under neutral or alkaline conditions Phosphate rock, which will also make the separation performance of flotation desilication worse