Additional screening-gravity separation process before phosphate rock positive flotation operation

Abstract

The invention relates to a method for pre-recovering phosphorus by adding a screening-gravity separation process before the positive flotation operation of phosphate rock. The technical scheme is: feed the phosphate rock slurry into the vibrating screen for classification before the positive flotation operation, the material on the screen is used as phosphorous concentrate I, and the material under the screen is fed into the three-stage spiral chute gravity separation process for one-stage roughing, Phosphate concentrate II and roughing tailings are obtained, and the roughing tailings are fed into the second stage of scavenging to obtain phosphorous concentrate III and scavenging tailings, and the scavenging tailings are fed into the third stage of scavenging to obtain phosphorous concentrate IV and Gravity separation tailings, the gravity separation tailings are fed into the thickener, the thickener is thickened to obtain dense overflow and thick underflow, the thick underflow is fed into the positive flotation operation for positive flotation, the thick overflow is used as circulating water, and the phosphorus concentrate The ore I, phosphorous concentrate II, phosphorous concentrate III and phosphorous concentrate IV are combined to obtain gravity separation concentrate. The advantage of this process is that most of the phosphorus in the phosphate rock is recovered in advance before the positive flotation operation, which can effectively reduce the processing capacity of the positive flotation operation and significantly reduce the production cost of the positive flotation.

Description

technical field [0001] The invention belongs to the technical field of phosphate rock beneficiation, and in particular relates to a screening-gravity separation process before the positive flotation operation of phosphate rock. Background technique [0002] my country has abundant reserves of phosphate rock resources, but P 2 o 5 The average grade is only about 17.0%, showing the characteristics of more low-grade ore and less rich ore. With the development of the phosphorus chemical industry, the reserves of rich ore are rapidly depleting, prompting people to study and utilize the most abundant reserves of siliceous and silicate-type and mixed-type two industrial types of low-grade phosphate rock. As an enhancement of phosphate rock P 2 o 5 The main technology of grade, the forward flotation process and the forward and reverse flotation process composed of forward flotation and reverse flotation are the methods with high efficiency for removing silicon and silicate gangu...

AI Technical Summary

Problems solved by technology

[0006] Ding Haitao et al. (Ding Haitao, Liu Zhihong. Experimental research on pre-enrichment of sedimentary silico-calcium phosphate rock by gravity separation [J]. Guizhou Chemical Industry, 2013, 38 (03): 3-5.) in the study of a sedimentary siliceous-calcium phosphate rock In the beneficiation test, the use of spiral chute gravity separation has achieved good technical indicators. However, when the ore processed by this method accounts for 35% of the ore fineness -0.074mm, the dissociation degree of collophosite monomer has already reached 73.80%. %, collophanite monomer particle size is relatively coarse and easy to dissociate, this method is not universal

Images