A kind of method that prepares magnesium hydroxide with high magnesium phosphorus tailings

A technology of high-magnesium phosphorus tailings and magnesium hydroxide, applied in the field of preparing magnesium hydroxide, to achieve the effect of solving land resources, good economic benefits and environmental protection, and saving resources

Active Publication Date: 2016-03-23
SINOFERT HOLDINGS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These patents all reflect the idea of ​​rational utilization of high magnesium phosphorus tailings, but at present, there is no report on the method of producing magnesium hydroxide from high magnesium phosphorus tailings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Composition of high-magnesium phosphate tailings: P 2 O 5 %:5.38%, MgO%:16.05%

[0025] Weigh 100g of high-magnesium phosphate tailings and calcinate at 850°C to obtain 61.4g of calcined white. Add the calcined white to 0.5L of 2.0mol / L ammonium sulfate solution under stirring (the mol ratio of ammonium sulfate to magnesium oxide is 2.5: 1) Drop industrial concentrated sulfuric acid (98% by mass) to control the pH between 6.0 and 6.5. When the concentrated sulfuric acid is added dropwise, the temperature of the reaction system rises, and when the temperature rises to about 80°C, control the dropwise addition The speed of the concentrated sulfuric acid makes the heating speed of the reaction system 0.1-1°C / min. Conducive to the overflow of ammonia and the precipitation of precipitation. Then keep the temperature of the reaction system at 95°C and react for 40 minutes. The overflowing ammonia gas is absorbed by water to obtain ammonia water. After the reaction is complete...

Embodiment example 2

[0027] Composition of high-magnesium phosphorus tailings: P2O5%: 6.35%, MgO%: 18.59%

[0028] Weigh 100g of high-magnesium phosphate tailings and calcinate at 900°C to obtain 60.4g of calcined white. Add the calcined white to 0.46L of 2.0mol / L ammonium sulfate solution under stirring (the mol ratio of ammonium sulfate to magnesium oxide is 2.0: 1). Drop industrial concentrated sulfuric acid (98% by mass) to control the PH value between 6.0-6.5. When the concentrated sulfuric acid is added dropwise, the temperature of the reaction system rises. When the temperature rises to about 80°C, control the dropwise addition The speed of the concentrated sulfuric acid makes the heating speed of the reaction system 0.1-1°C / min. Conducive to the overflow of ammonia and the precipitation of precipitation. Then keep the temperature of the reaction system at 100°C and react for 60min. The overflowing ammonia gas is absorbed by water to obtain ammonia water. After the reaction is completed, fi...

Embodiment example 3

[0030] Composition of high-magnesium phosphorus tailings: P2O5%: 9.84%, MgO%: 15.03%

[0031] Weigh 100g of high-magnesium phosphate tailings and calcined at 1100°C to obtain 65.3g of calcined white. Add the calcined white to 0.57L of 2.0mol / L ammonium sulfate solution under stirring (the mol ratio of ammonium sulfate to magnesium oxide is 3.0: 1) Drop industrial concentrated sulfuric acid (98% by mass) to control the pH between 6.0 and 6.5. When the concentrated sulfuric acid is added dropwise, the temperature of the reaction system rises, and when the temperature rises to about 80°C, control the dropwise addition The speed of the concentrated sulfuric acid makes the heating speed of the reaction system 0.1-1°C / min. Conducive to the overflow of ammonia and the precipitation of precipitation. Then keep the temperature of the reaction system at 98°C, and react for 80 min. The overflowing ammonia gas is absorbed by water to obtain ammonia water. After the reaction is completed, ...

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Abstract

The invention discloses a method for preparing magnesium hydroxide from phosphate tailings with high magnesium content. The method comprises the following steps: (1), calcining the phosphate tailings with high magnesium content at a temperature of 850-1100 DEG C to form calcined dolomite; (2), adding the calcined dolomite into an ammonium sulfate solution, dropwise adding concentrated sulfuric acid to control a pH value to be 6.0-6.5, keeping a temperature of a reaction system at 95-100 DEG C to react for 40-80 minutes and absorbing ammonia gas coming out of the reaction system through water to obtain ammonia water; (3), filtering after the reaction is completed to obtain filtrate and a filter cake; (4), mixing the filtrate of the step (3) with the ammonia water obtained in the step (2), introducing the ammonia gas or adding liquid ammonia or the ammonia water to control magnesium hydroxide to precipitate, filtering after the precipitation is completed, washing and drying the filter cake to obtain a magnesium hydroxide product, and collecting filtrate as a raw material solution of the ammonium sulfate solution in the step (2). The method is capable of turning waste into wealth and recycling waste phosphate tailings with high magnesium content for preparing the magnesium hydroxide, simple in process and significant in economic and environmental benefits.

Description

Technical field [0001] The invention relates to a method for preparing magnesium hydroxide from high-magnesium phosphate tailings, and belongs to the field of chemical technology. Background technique [0002] Most of my country's phosphate rock is low-grade phosphate rock, generally need to be enriched into high-grade phosphate concentrate by flotation to be used. High-magnesium phosphate tailings are by-products of phosphate concentrates obtained by flotation enrichment of phosphate ore. Its main components are calcium magnesium phosphate, among which P 2 O 5 The content is 3%-10%, the MgO content is 15%-20%, and the CaO content is 28%-42%. It belongs to high-magnesium, low-phosphorus phosphate rock. At present, the treatment of phosphate ore flotation tailings at home and abroad mainly adopts dam and stockpiling, which is rarely used. The comprehensive utilization rate of the by-product phosphorus tailings produced by the phosphorus mining industry in my country is only about...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/16
Inventor 盛勇梅胜明周佩谭伟韦莎刘萍郑开元邹小丽陈明凤
Owner SINOFERT HOLDINGS
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