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A kind of high-efficiency magnesium oxide prepares magnesium hydroxide process

A technology of magnesium hydroxide and magnesium oxide, applied in magnesium hydroxide and other directions, to achieve the effects of low energy consumption, no environmental pollution, and low water consumption

Active Publication Date: 2016-12-28
后英集团海城市高新技术产品有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a process for preparing magnesium hydroxide from magnesium oxide, which has simple process, low energy consumption, no environmental pollution problem, and less water consumption

Method used

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  • A kind of high-efficiency magnesium oxide prepares magnesium hydroxide process

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Comparison scheme
Effect test

Embodiment 1

[0033] A kind of magnesium oxide prepares magnesium hydroxide technique, completes according to following operations:

[0034] 1) Dry digestion

[0035] Add the dry magnesium oxide powder into the airtight container with a stirring device through the valve, and at the same time, add the water stored in the water tank into the airtight container evenly through the valve. The mass ratio of the dry magnesium oxide powder to the added water is 1:0.4;

[0036] 2) Pressurized digestion and oxidation

[0037] Magnesium and water gradually start to react to generate magnesium hydroxide, and gradually release heat. During this period, the temperature of the material in the closed container begins to rise, and the pressure begins to rise. The pressure in the container was stabilized at 0.08MPa, and the reaction lasted for 135 minutes;

[0038] 3) Heat recovery

[0039] The steam generated during the reaction between magnesium oxide and water is discharged into the water tank connecte...

Embodiment 2

[0043] A kind of magnesium oxide prepares magnesium hydroxide technique, completes according to following operations:

[0044] 1) Dry digestion

[0045] Add the magnesium oxide dry powder into the airtight container with a stirring device through the valve, and at the same time, the water stored in the water tank is evenly added into the airtight container through the valve. The mass ratio of the magnesium oxide dry powder to the added water is 1:0.5,

[0046] 2) Pressurized digestion and oxidation

[0047] Magnesium and water gradually start to react to generate magnesium hydroxide, and gradually release heat. During this period, the temperature of the material in the closed container begins to rise, and the pressure begins to rise. The pressure is stabilized at 0.2MPa, and the reaction is 80 minutes;

[0048] 3) Heat recovery

[0049] The steam generated during the reaction between magnesium oxide and water is discharged into the water tank connected to the airtight conta...

Embodiment 3

[0053] A kind of magnesium oxide prepares magnesium hydroxide technique, completes according to following operations:

[0054] 1) Dry digestion

[0055] Add the dry magnesium oxide powder into the airtight container with a stirring device through the valve, and at the same time, add the water stored in the water tank into the airtight container evenly through the valve. The mass ratio of the dry magnesium oxide powder to the added water is 1:0.6;

[0056] 2) Pressurized digestion and oxidation

[0057] Magnesium and water gradually start to react to generate magnesium hydroxide, and gradually release heat. During this period, the temperature of the material in the closed container begins to rise, and the pressure begins to rise. When the pressure reaches 0.3MPa and the temperature reaches 100°C, close the pressure regulating valve and pass The pressure stabilizing device stabilizes the pressure in the container at 0.3MPa, and reacts for 50 minutes;

[0058] 3) Heat recovery ...

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Abstract

The invention relates to a technology for preparing magnesium hydrate from magnesium oxide. A device for preparing magnesium hydrate from magnesium oxide comprises a closed container, wherein the closed container is provided with a feeding pipeline, a water inlet pipeline and a discharging pipeline, the water inlet pipeline is connected to a water tank, a stirring device is arranged in the closed container, the closed container is connected with a pressure stabilizing device which is communicated with the water tank, and valves are arranged on the pipelines. By the adoption of the device, dry digestion, pressurization digestion, heat recovery and reclaiming are conducted on magnesium oxide dry powder to obtain magnesium hydrate. The technology is simple, water consumption is low, and heat is recovered; the finished product is obtained directly after digestion, dewatering, drying, scattering and the like are not needed, and energy consumption is low; due to the fact that dewatering is not needed, sewage treatment is not needed, and environment pollution is avoided.

Description

technical field [0001] The invention relates to a process for preparing magnesium hydroxide from magnesium oxide. Background technique [0002] There are abundant magnesite resources in southern Liaoning. Magnesite is an important basic material. Magnesite is calcined to generate magnesium oxide, which is digested to generate magnesium hydroxide. The reaction equation is as follows: [0003] Mgo+H2O→Mg(OH)2 [0004] Magnesium hydroxide is an important series of magnesium chemical products, widely used in rubber, plastics, paint coatings, chemical and other industries. At the same time, active magnesium hydroxide is a widely used flame retardant. [0005] Traditional magnesium oxide digestion adopts wet process, which has the following disadvantages: [0006] 1. The process is complex and the digestion time is long, requiring multiple processes such as pulping → long time digestion → dehydration → drying → breaking up. [0007] 2. Large water consumption: a large amount o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/14
Inventor 王坤云
Owner 后英集团海城市高新技术产品有限公司