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Preparation method of magnesium hydroxide powder

A technology of magnesium hydroxide and light-burned magnesium oxide, which is applied in the direction of magnesium hydroxide and nanotechnology, can solve the problems that the performance of magnesium hydroxide needs to be improved, and achieve easy control of the microstructure, easy control of the average particle size, and low cost Effect

Inactive Publication Date: 2019-05-17
ZHONGMIN CHIYUAN IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to propose a method for preparing magnesium hydroxide powder for the problem that the performance of magnesium hydroxide still needs to be improved at present. The specific surface area, average particle size and microstructure of the magnesium hydroxide prepared by the method are easy to control

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  • Preparation method of magnesium hydroxide powder

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Embodiment 1

[0014] The present embodiment discloses a kind of preparation method of magnesium hydroxide powder. Specific examples are as follows:

[0015] Example 1: Weigh 1000 g of light-burned magnesium oxide and place it in a reaction tank. The main chemical composition of light-burned magnesia is: MgO 95.26%, SiO 2 0.69%, CaO 1.45%, Al 2 o 3 0.18%, Fe 2 o 3 0.09%. Add 2000L of water into the reaction tank, and fully stir with light-burned magnesia. The reaction tank was heated to a constant temperature of 75° C., and then a pulse current was applied on both sides of the reaction tank. The current magnitude was 5 V, the pulse frequency was 100 Hz, and the pulse current was applied for 6 hours.

[0016] After the reaction, the hydrated magnesium hydroxide was taken out from the reaction tank, and dried at 120° C. for 12 hours. For the dried magnesium hydroxide powder, its specific surface area and average particle size were measured, and its microstructure was observed with an...

Embodiment 2

[0018] Weigh 1000 g of light-burned magnesium oxide and place it in a reaction tank. The main chemical composition of light-burned magnesium oxide is the same as in Example 1. Add 2000L of water into the reaction tank, and fully stir with light-burned magnesia. The reaction tank was heated to a constant temperature of 75° C., and then a pulse current was applied to both sides of the reaction tank. The current was 50 V, the pulse frequency was 50 Hz, and the pulse current was applied for 3 hours.

[0019] After the reaction, the hydrated magnesium hydroxide was taken out from the reaction tank, and dried at 120° C. for 12 hours. For the dried magnesium hydroxide powder, its specific surface area and average particle size were measured, and its microstructure was observed with an electron microscope. The results are shown in Table 1.

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Abstract

The invention provides a preparation method of magnesium hydroxide powder. The method comprises the following step: pulse current is applied in a reaction system when light calcined magnesia is utilized to prepare the magnesium hydroxide powder via hydration reaction. The magnitude of the pulse current applied in the reaction system is 5-1,000 A, and the used pulse frequency is 50-2,000 Hz. By adjusting the magnitude of the pulse current and the pulse frequency, the specific surface area, average particle size and microstructure and morphology of the magnesium hydroxide are controlled by the invention. Compared with the prior art, the preparation method provided by the invention has the following advantages: the process is simple, the cost is low, and the specific surface area, average particle size and microstructure and morphology of the magnesium hydroxide are easy to control.

Description

technical field [0001] The invention relates to material preparation technology, in particular to a preparation method of magnesium hydroxide powder. Background technique [0002] Magnesium hydroxide powder is widely used in the fields of flame retardancy of plastic and rubber products, flue gas desulfurization, wastewater treatment, food addition and material insulation. In order to improve the use effect of magnesium hydroxide in the above-mentioned fields, it is very important to control the specific surface area, average particle size and microstructure in the preparation process of magnesium hydroxide. Contents of the invention [0003] The object of the present invention is to propose a method for preparing magnesium hydroxide powder for the problem that the performance of magnesium hydroxide still needs to be improved at present. The specific surface area, average particle size and microstructure of the magnesium hydroxide prepared by the method are easy to control....

Claims

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Application Information

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IPC IPC(8): C01F5/16B82Y40/00
Inventor 郑岐王洪英平振丰
Owner ZHONGMIN CHIYUAN IND
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