A method for preparing high-quality phosphorous concentrate

Abstract

The invention relates to a method for preparing high-quality phosphorous concentrate. Reverse flotation to remove SiO in micro-particles mainly by means of reverse flotation reagents 2 and sesquioxides, this technology is different from the currently widely used coarse-grained reverse flotation to remove SiO 2 , Fine-grained direct tailing process. The invention overcomes the influence of fine-grained ore slime on flotation, and realizes efficient reverse flotation removal of SiO in fine-grained particles 2 and sesquioxides. The phosphorous concentrate prepared by the method can reduce the emission of phosphogypsum in the production process of wet-process phosphoric acid, and improve the purity of calcium sulfate dihydrate in the phosphogypsum.

Description

Technical field [0001] The present invention particularly relates to a high P 2 O 5 Low SiO 2 , Preparation of phosphate concentrate sesquioxide low content of phosphate rock beneficiation and belongs to the field of reduction of phosphogypsum. Background technique [0002] my country's phosphate rock reserves is rich, but the vast majority of the need for beneficiation and processing in order to become qualified downstream use of raw materials. [0003] Because the flotation higher production costs, so that most of the phosphate rock beneficiation embodiment carbonate gangue removed reverse flotation processing, is supplied to the downstream production of wet process phosphoric acid used. [0004] With the continued development and utilization of phosphate resources has led to further depleted of phosphate resources, only simple anti-flotation of phosphate concentrate MgO removal process in phosphate obtained has become increasingly unable to meet downstream of the mine in WPA r...

AI Technical Summary

Problems solved by technology

[0004] With the continuous development and utilization of phosphate rock resources, the phosphate rock resources are further depleted, and the phosphorous concentrate obtained by simply using reverse flotation to remove MgO from phosphate rock is increasingly unable to meet the needs of downstream wet-process phosphoric acid ore. requirements, on the one hand after MgO removal P 2 o 5 The recovery rate is reduced. On the other hand, the process cannot effectively reduce the sesquioxide content, which affects the production of wet-process phosphoric acid. At the same time, a large amount of silicate enters the wet-process phosphoric acid process, which also leads to low phosphoric acid production efficiency and phosphogypsum emissions. increase, the content of calcium sulfate dihydrate in phosphogypsum decreases

[0005] SiO from phosphate rock 2 From the point of view of the intercalation particle size characteristics of sesquioxide, SiO 2 Sesquioxide and sesquioxide are embedded in phosphate rock with fine particle size, especially the content of sesquioxide in the fine-grained grade is often many orders of magnitude higher than that in the coarse-grained grade. The treatment methods currently available for this characteristic It is to classify and desludge the fine particle level and directly throw the tail. This method will greatly reduce the recovery rate of phosphate ore, and the technical and economic indicators are extremely poor, so it is usually not adopted.

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