High-power half-medium-low-grade silicon-calcium phosphorite combined separation process

Abstract

The invention discloses a high-power half-medium-low-grade silicon-calcium phosphorite combined separation process, and belongs to the field of phosphorite separation. The process specifically comprises the following steps that a high-power half-medium-low-grade silicon-calcium phosphorite is subjected to wet grinding and then reverse flotation is carried out to obtain flotation concentrate and tailings, the flotation concentrate is subjected to graded desliming, low-magnesium and low-half graded coarse-grained materials are final concentrate, and fine-grained materials are taken as middlings;and the concentrate product is allowed to be subjected to downstream wet-process phosphoric acid, middling smelting yellow phosphorus and tailing cemented filling treatment. According to the process,the content of concentrate metal ion oxide and silicon dioxide is reduced through reverse flotation and grading desliming combined separation. The middlings with certain phosphorus content and high silicon content are used for smelting yellow phosphorus, and the comprehensive utilization rate of phosphorus resources is high; the tailings cemented filling treatment is carried out, and no three wastes are discharged by a system.

Description

technical field [0001] The invention relates to a combined separation process of high-grade semi-medium-low-grade silicon-calcium phosphate ore, which belongs to the field of phosphate rock separation and comprehensive utilization of products. Background technique [0002] At present, most of the phosphate rocks in China are used for wet-process phosphoric acid, and some massive phosphate rocks are used for smelting yellow phosphorus in electric furnaces. [0003] The wet process phosphoric acid process affects the grade of phosphate rock (P 2 o 5 %) and impurity content have certain requirements. Among them, the impurity content is mainly metal ion (Mg, Fe, Al) oxides, phosphate rock SiO used for acid processing in phosphorus chemical enterprises 2 The content is usually required to be below 6%. On the contrary, due to SiO 2 Solubilizing effect, smelting yellow phosphorus paraphosphate ore SiO by electric furnace method 2 There is a minimum requirement for the content...

AI Technical Summary

Problems solved by technology

to R 2 o 3 , SiO 2 The sorting forward and reverse flotation process has the disadvantages of complicated process and high production cost

There is no effective separation process for industrial application of high-semi-medium- and low-grade silici-calcium phosphorites, and some high-semi-medium- and low-grade silicon-calcium phosphate rock mines are in the state of "dead mine"

Images