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Method for removing magnesium from ultralow-quality phosphate rock and producing magnesium hydroxide

A technology of magnesium hydroxide and phosphate rock, applied in magnesium hydroxide and other directions, to achieve the effects of low one-time investment cost, high yield and reduced loss

Inactive Publication Date: 2014-09-10
GUIZHOU KAILIN GRP MINERAL FERTILIZER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since collophanite mostly contains dolomite and the buoyancy of the two is similar, the use of flotation methods has not been able to solve the problem of dolomite separation in collophanite.

Method used

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  • Method for removing magnesium from ultralow-quality phosphate rock and producing magnesium hydroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take ultra-low-grade phosphate rock (P 2 o 5 ≤28%, MgO≥3%, MgO / P 2 o 5 ≥10%). Grind phosphate rock to obtain phosphate rock powder with a fineness of 60 mesh; add sulfurous acid with a concentration of 5% and sulfuric acid with a concentration of 5% into a solution of fluosilicic acid with a concentration of 17%, and the mass ratio of the addition is sulfurous acid : sulfuric acid: fluosilicic acid = 1: 1.2: 1.3, stir evenly to obtain a mixed acid demagnesizing agent; add phosphate rock powder to the mixed acid demagnesizing agent, heat up to 30°C, stir at a rate of 300r / min, and react for 10 minutes , the reaction is completed when the reaction solution pH=3; after the reaction is completed, the solution is separated from the solid phase by filtration while it is hot, and the solution is a solution containing magnesium salt; the solid phase is washed with distilled water until the washing water is neutral, and the obtained solid Drying, that is, phosphate ore conce...

Embodiment 2

[0034] Take ultra-low-grade phosphate rock (P2 o 5 ≤28%, MgO≥3%, MgO / P 2 o 5 ≥10%). Grind phosphate rock to obtain phosphate rock powder with a fineness of 80 meshes; add sulfurous acid with a concentration of 10% and sulfuric acid with a concentration of 10% to a solution of fluosilicic acid with a concentration of 34%, and the added mass ratio is sulfurous acid : Sulfuric acid: Fluosilicic acid = 1: 1.2: 1.3, stir evenly to obtain a mixed acid demagnesizing agent; add phosphate rock powder to the mixed acid demagnesizing agent, heat up to 45°C, stir at a rate of 325r / min, and react for 30 minutes , the reaction is completed when the reaction solution pH=4; after the reaction is completed, the solution is separated from the solid phase by filtration while it is hot, and the solution is a solution containing magnesium salt; the solid phase is washed with distilled water until the washing water is neutral, and the obtained solid Drying, that is, phosphate ore concentrate; mi...

Embodiment 3

[0036] Take ultra-low-grade phosphate rock (P 2 o 5 ≤28%, MgO≥3%, MgO / P 2 o 5 ≥10%). Grind phosphate rock to obtain phosphate rock powder with a fineness of 100 mesh; add sulfurous acid with a concentration of 20% and sulfuric acid with a concentration of 20% to a solution of fluosilicic acid with a concentration of 51%, and the added mass ratio is sulfurous acid : sulfuric acid: fluosilicic acid = 1: 1.2: 1.3, stir evenly to obtain a mixed acid demagnesizing agent; add phosphate rock powder to the mixed acid demagnesizing agent, heat up to 60°C, stir at a rate of 350r / min, and react for 60 minutes , the reaction is completed when the reaction solution pH=6; after the reaction is completed, the solution is separated from the solid phase by filtration while it is hot, and the solution is a solution containing magnesium salt; the solid phase is washed with distilled water until the washing water is neutral, and the obtained solid Drying, that is, phosphate ore concentrate; m...

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PUM

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Abstract

The invention discloses a method for removing magnesium from an ultralow-quality phosphate rock and producing magnesium hydroxide. The method comprises the steps as follows: mixing phosphate rock powder with a magnesium remover for magnesium removal reaction, carrying out solid-liquid separation, obtaining solid-phosphate concentrate, and adding a neutralization and sedimentation agent into liquid to obtain a magnesium byproduct. The method is characterized by taking the ultralow-quality phosphate rock as a raw material and mixed acid of sulphurous acid, sulfuric acid and fluorosilicic acid as the magnesium remover, carrying out solid-liquid separation, mixing washing water for washing a solid phase with a solution obtained after separation, and carrying out neutralization and sedimentation reaction. According to the method, mixed acid of sulphurous acid, sulfuric acid and fluorosilicic acid is adopted as the magnesium remover, so that the P2O5 loss is reduced; the process route is short, the operation is simple and the one-time investment cost is low; the magnesium removal rate can reach more than 80% and the content of magnesium in the obtained concentrate is lower than 1%; and the obtained phosphate concentrate is good in quality, the quality is improved by 5-10%, the P2O5 yield is high and can reach more than 99% under the optimal process conditions, and the P2O5 content is increased by 3-5% in general.

Description

technical field [0001] The invention relates to a method for removing magnesium from ultra-low-grade phosphate rock and producing magnesium hydroxide. Background technique [0002] The rich ore in my country's phosphate rock resources only accounts for about 8%, and the raw phosphate rock is mostly low-grade collophosphine, with high impurities such as Mg, Al, and Fe. In the production process of wet-process phosphoric acid, the existence of impurity Mg not only affects the production of wet-process phosphoric acid, but also has a significant impact on the economic and technical indicators of phosphoric acid deep processing. In addition, the international commodity phosphate rock also has certain requirements on the ratio of magnesium to phosphorus. At present, domestic wet-process phosphoric acid production enterprises generally face many process problems caused by phosphate rock depletion, such as: poor reactivity in wet-process phosphoric acid production, difficult gypsu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/22
Inventor 宋同彬韩朝应王先炜
Owner GUIZHOU KAILIN GRP MINERAL FERTILIZER CO LTD
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