CN104386718A - Method for preparing magnesium hydrate - Google Patents

Abstract

The invention discloses a method for preparing magnesium hydrate. The method comprises the following steps: (1) adding 25g/l of magnesium sulfate and 30g/l of sodium hydroxide into a water solution, and stirring for 65 minutes; (2) adding 0.6g/l of polyoxyethylene stearate, 0.7g/l of alkylolamide polyoxyethylene ether and 0.4g/l of polyethylene glycol distearate into the water solution; (3) adding the mixed solution into a high pressure reaction kettle, stirring at the speed of 250r/min, and maintaining the temperature at 235 DEG C for 7 hours; and (4) after cooling, filtering by virtue of a high-pressure automatic diaphragm pressure filter, washing by virtue of deionized water, and finally drying and crushing, so as to obtain magnesium hydrate. According to the method, the purity of magnesium hydrate is high, grains of magnesium hydrate are relatively fine, and the surface activity of magnesium hydrate is greatly improved.

Description

Prepare the method for magnesium hydroxide

Technical field

The present invention relates to the method preparing magnesium hydroxide.

Background technology

The preparation method of existing magnesium hydroxide, its magnesium hydroxide purity prepared is not high enough, and particle is thin not, and surfactivity is bad.

Summary of the invention

The object of the present invention is to provide a kind of method preparing magnesium hydroxide, its magnesium hydroxide purity prepared is higher, and particle is thinner, also substantially increases the surfactivity of magnesium hydroxide.

For achieving the above object, technical scheme of the present invention is a kind of method preparing magnesium hydroxide of design, comprises the steps:

1) add the magnesium sulfate of 25g/l, the sodium hydroxide of 30g/l in aqueous, stir 65min;

2) polyoxyethylene stearic acid ester of 0.6g/l, the alkylol amide polyethylene oxide ether of 0.7g/l, the Triglycol distearate of 0.4g/l is added again;

3) mixed solution is inserted autoclave, keep stirring 250r/min, at 235 DEG C of insulation 7h;

4) after cooling, by high pressure automatic diaphragm Filter Press, use deionized water washing, final drying is pulverized, and can obtain magnesium hydroxide finished product.

Advantage of the present invention and beneficial effect are: provide a kind of method preparing magnesium hydroxide, and its magnesium hydroxide purity prepared is higher, and particle is thinner, also substantially increases the surfactivity of magnesium hydroxide.

Embodiment

Below in conjunction with embodiment, the specific embodiment of the present invention is further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.

The technical scheme that the present invention specifically implements is:

Prepare a method for magnesium hydroxide, comprise the steps:

1) add the magnesium sulfate of 25g/l, the sodium hydroxide of 30g/l in aqueous, stir 65min;

2) polyoxyethylene stearic acid ester of 0.6g/l, the alkylol amide polyethylene oxide ether of 0.7g/l, the Triglycol distearate of 0.4g/l is added again;

3) mixed solution is inserted autoclave, keep stirring 250r/min, at 235 DEG C of insulation 7h;

4) after cooling, by high pressure automatic diaphragm Filter Press, use deionized water washing, final drying is pulverized, and can obtain magnesium hydroxide finished product.

 

The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (1)

1. prepare the method for magnesium hydroxide, it is characterized in that, comprise the steps:

1) add the magnesium sulfate of 25g/l, the sodium hydroxide of 30g/l in aqueous, stir 65min;

2) polyoxyethylene stearic acid ester of 0.6g/l, the alkylol amide polyethylene oxide ether of 0.7g/l, the Triglycol distearate of 0.4g/l is added again;

3) mixed solution is inserted autoclave, keep stirring 250r/min, at 235 DEG C of insulation 7h;

4) after cooling, by high pressure automatic diaphragm Filter Press, use deionized water washing, final drying is pulverized, and can obtain magnesium hydroxide finished product.