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Hydration synthesis method of magnesium hydroxide slurry material with controllable dissolution rate

A magnesium hydroxide and hydration technology, applied in the direction of magnesium hydroxide, etc., can solve the problems not involved in the regulation of the dissolution rate of magnesium hydroxide slurry, and achieve the effect of reducing agglomeration and increasing the dissolution rate

Active Publication Date: 2019-04-05
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, relevant research mainly focuses on dispersibility, crystal shape, synthesis efficiency, etc., and does not involve the regulation of the dissolution rate of magnesium hydroxide slurry

Method used

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  • Hydration synthesis method of magnesium hydroxide slurry material with controllable dissolution rate
  • Hydration synthesis method of magnesium hydroxide slurry material with controllable dissolution rate
  • Hydration synthesis method of magnesium hydroxide slurry material with controllable dissolution rate

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A kind of magnesium hydroxide slurry hydration synthetic method with controllable dissolution rate, described method comprises the steps:

[0027] Crush 4000g of magnesite raw stone to 1250 mesh, and calcined at 650°C for 3 hours to obtain light-calcined magnesium oxide powder;

[0028] Add 20g of lightly calcined magnesium oxide powder to 200mL of hydration agent solution while maintaining the calcining temperature, and stir homogeneously to obtain magnesium hydroxide slurry;

[0029] The hydrating agent solution is sodium acetate with a concentration of 1%;

[0030] The homogeneous stirring speed is 1300rpm;

[0031] The time of the hydration reaction is 0.5h;

[0032] The dissolution rate of magnesium hydroxide slurry was measured by constant pH titration method, and no hydration agent was added to the control group.

Embodiment 2

[0034] A magnesium hydroxide slurry hydration synthesis method with controllable dissolution rate, the difference from Example 1 is that the hydration agent solution is ammonium acetate.

Embodiment 3

[0036] A magnesium hydroxide slurry hydration synthesis method with controllable dissolution rate, the difference from Example 1 is that the hydration agent solution is acetic acid.

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Abstract

The invention relates to a hydration synthesis method of a magnesium hydroxide slurry material with controllable dissolution rate, and belongs to the technical field of inorganic chemical material preparation. The method includes the following steps: grinding magnesite and calcining at 600-900 DEG C for 1-5 hours to obtain lightly-burned magnesium oxide powder; adding the light burned magnesium oxide powder into a hydration agent solution at the calcination temperature, wherein the weight ratio of solid to liquid is 1: 5-20, anions in the hydration agent solution are at least one of chloride ions, nitrate ions, sulfate ions, acetate ions and oxalate ions, cations in the hydration agent solution are at least one of hydrogen ions, sodium ions, magnesium ions, calcium ions, iron ions, ferrousions, aluminum ions and ammonium ions, and the concentration of the hydration agent solution is 0.5-5%; and preforming homogenization stirring, wherein the homogenization stirring speed is 800-2000 rpm. According to the method, heat treatment, chemical treatment and mechanical activation are organically combined to realize the dissolution rate regulation of the synthesized magnesium hydroxide slurry material.

Description

technical field [0001] The invention relates to a hydration synthesis method of magnesium hydroxide slurry with controllable dissolution rate, belonging to the technical field of preparation of inorganic chemical materials. Background technique [0002] Magnesium hydroxide is known as the "third alkali" and is a green and safe environmental treatment agent. It has shown good application prospects in the fields of acid waste gas and wastewater treatment, especially the slurry-like magnesium hydroxide has a huge demand for environmental protection. [0003] The low dissolution rate of magnesium hydroxide has its safety advantages, but it also has the disadvantage of low efficiency. For example, in the wastewater struvite nitrogen and phosphorus recovery process using magnesium hydroxide as the magnesium source, OH - and Mg 2+ The slow-release process can control the crystallization reaction on the surface of magnesium hydroxide particles, thereby alleviating the fouling of p...

Claims

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Application Information

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IPC IPC(8): C01F5/14
CPCC01F5/14
Inventor 唐晓佳朱益民杜钟原刘淼柏苏北唐乾
Owner DALIAN MARITIME UNIVERSITY
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