Preparation method of submicron magnesium hydroxide

A magnesium hydroxide, sub-micron technology, applied in the field of inorganic materials and microchemical engineering, can solve the problems of increasing the complexity of the production process and production costs, achieve continuous precipitation process, strong process controllability, and increase growth rate Effect

Inactive Publication Date: 2020-01-14
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

Obviously, both methods will increase the complex

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  • Preparation method of submicron magnesium hydroxide
  • Preparation method of submicron magnesium hydroxide
  • Preparation method of submicron magnesium hydroxide

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[0023] Example 1

[0024] Configure MgCl separately 2 500mL each of the aqueous solution and the mixed aqueous solution of NaOH and NaCl, of which MgCl 2 The concentration is 1.0 mol / L, the NaOH concentration is 1.6 mol / L, and the NaCl concentration is 2.4 mol / L. Both of the above two aqueous solutions enter the microreactor at a flow rate of 150mL / min for contact, mixing and reaction, n(Mg 2+ ):n(OH - )=1:1.6, and the reaction temperature is 60°C. After the reaction slurry flows out from the outlet of the microreactor, it directly enters the hydrothermal synthesis kettle, and undergoes hydrothermal treatment at 180° C., and the hydrothermal time is 4 hours. After the hydrothermal treatment, 200 mL of the reaction slurry after the hydrothermal reaction was placed in a Buchner funnel with an inner diameter of 9 cm for vacuum filtration, and the filtration time was determined to be 500 s. After washing with deionized water for three times, it was placed in an oven to dry for 6 hou...

Example Embodiment

[0025] Example 2

[0026] Configure MgCl separately 2 500mL each of the aqueous solution and the mixed aqueous solution of NaOH and NaCl, of which MgCl 2 The concentration is 0.5 mol / L, the NaOH concentration is 1.0 mol / L, and the NaCl concentration is 3.0 mol / L. Both of the above two aqueous solutions enter the microreactor at a flow rate of 150mL / min for contact, mixing and reaction, n(Mg 2+ ):n(OH - )=1:2.0, and the reaction temperature is 60°C. After the reaction slurry flows out from the outlet of the microreactor, it directly enters the hydrothermal synthesis kettle, and undergoes hydrothermal treatment at 180° C., and the hydrothermal time is 4 hours. After the hydrothermal treatment, 200 mL of the reaction slurry after the hydrothermal reaction was placed in a Buchner funnel with an inner diameter of 9 cm for vacuum filtration, and the filtration time was determined to be 420 s. After washing with deionized water for three times, it was placed in an oven to dry for 6 hou...

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Abstract

The invention provides a preparation method of submicron magnesium hydroxide. The mixed aqueous solution of sodium hydroxide and sodium chloride is used as precipitant to precipitate with magnesium chloride aqueous solution in the microreactor at a certain temperature. The reaction slurry flows out of the microreactor and directly enters a hydrothermal synthesis kettle, and is subjected to hydrothermal treatment at a certain temperature. After hydrothermal treatment, the slurry is filtered, washed and dried to obtain submicron magnesium hydroxide. Compared with only using sodium hydroxide as precipitant, the magnesium hydroxide prepared by the method has larger average particle size, is easier to filter and wash under the same hydrothermal conditions, and significantly improves the production efficiency. In addition, because the precipitation reaction is carried out in the microreactor, the preparation process is semi-continuous and easy to enlarge, and the repeatability between product batches is good.

Description

technical field [0001] The invention relates to a preparation method of submicron magnesium hydroxide, belonging to the fields of inorganic materials and microchemical engineering. Background technique [0002] Magnesium hydroxide is an important inorganic chemical product, because of its high thermal stability, strong adsorption capacity, weak alkalinity, non-toxic and harmless, it is widely used in material processing (flame retardant, fine ceramics, coatings, etc. ), environmental protection (wastewater treatment, flue gas desulfurization, heavy metal removal, etc.), food addition and other fields. According to different states of matter, the preparation methods of magnesium hydroxide can be divided into solid-phase method, liquid-phase method and gas-phase method. Among them, the liquid phase precipitation method is the most commonly used preparation method, and the precipitating agent used includes limestone, sodium hydroxide, ammonia water, etc. When sodium hydroxide...

Claims

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Application Information

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IPC IPC(8): C01F5/22
CPCC01F5/22C01P2004/52C01P2004/62
Inventor 陈光文杨梅罗腊梅
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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