Method for preparing anhydrous magnesium carbonate powder

A technology of anhydrous magnesium carbonate and powder, applied in the direction of magnesium carbonate, etc., can solve the problems that only hydrated alkali can be prepared, and anhydrous magnesium carbonate cannot be prepared, and achieve the effect of simple and feasible technology

Inactive Publication Date: 2013-11-13
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The problem to be solved by the present invention is that the anhydrous magnesium carbonate composed of a single phase cannot be prepared by traditional production methods at home and abroad at present, and only hydrated basic magnesium carbonate can be prepared

Method used

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  • Method for preparing anhydrous magnesium carbonate powder
  • Method for preparing anhydrous magnesium carbonate powder
  • Method for preparing anhydrous magnesium carbonate powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A flower-like anhydrous magnesium carbonate powder composed of a single phase is prepared. Its technological process comprises the following steps:

[0026] 1. Prepare 35ml of 1.0mol / L magnesium chloride solution, and prepare 35ml of urea solution according to the molar ratio of 1:4.

[0027] 2. Mix and stir the magnesium chloride solution and the urea solution evenly, and add 2.5 g of sodium citrate thereto.

[0028] 3. Add the reaction solution into a high-temperature and high-pressure reactor, and react at 120° C. for 24 hours.

[0029] 4. Take out the reaction kettle obtained from the reaction, and after cooling for 12 hours, wash the precipitate, filter it, and dry it.

[0030] 5. The obtained sample is detected by an X-ray diffractometer and a scanning electron microscope, and the flower-shaped anhydrous magnesium carbonate powder composed of a single phase is obtained.

Embodiment 2

[0032] Spherical anhydrous magnesium carbonate powder composed of a single phase is prepared. Its technological process comprises the following steps:

[0033] 1. Prepare 35ml of 2.0mol / L magnesium chloride solution, and prepare 35ml of urea solution according to the molar ratio of 1:8.

[0034] 2. Mix and stir the magnesium chloride solution and the urea solution evenly, and add 3.7 g of sodium citrate thereto.

[0035] 3. Add the reaction solution into a high-temperature and high-pressure reactor, and react at 200°C for 24 hours.

[0036] 4. Take out the reaction kettle obtained from the reaction, and after cooling for 12 hours, wash the precipitate, filter it, and dry it.

[0037] 5. The obtained sample is detected by an X-ray diffractometer and a scanning electron microscope, and it is a spherical anhydrous magnesium carbonate powder composed of a single phase.

Embodiment 3

[0039] Anhydrous magnesium carbonate powder mixed with flower shape and spherical shape composed of single phase is prepared. Its technological process comprises the following steps:

[0040] 1. Prepare 35ml of 1.0mol / L magnesium chloride solution, and prepare 35ml of urea solution according to the molar ratio of 1:6.

[0041] 2. Mix and stir the magnesium chloride solution and the urea solution evenly, and add 4.5 g of sodium citrate thereto.

[0042] 3. Add the reaction solution into a high-temperature and high-pressure reactor, and react at 160° C. for 24 hours.

[0043] 4. Take out the reaction kettle obtained from the reaction, and after cooling for 12 hours, wash the precipitate, filter it, and dry it.

[0044] 5. The obtained sample is detected by X-ray diffractometer and scanning electron microscope, and the spherical anhydrous magnesium carbonate powder composed of a single phase is obtained

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Abstract

The invention discloses a method for preparing anhydrous magnesium carbonate (MgCO3) powder. In the method, magnesium chloride (MgCl2) is adopted as a magnesium source, carbamide (NH2)2CO is adopted as a precipitant, and chelant sodium citrate (C6H5O7Na3 2H2O) is added under the condition of hydrothermal reaction and different reaction time of 6-24 hours under the temperature of 100-200 DEG C to prepare the anhydrous magnesium carbonate powder. With the method, the anhydrous magnesium carbonate powder with single-phase composition and unique flowery and spherical shapes can be prepared. At present, except for magnesite magnesium carbonate, other magnesium carbonate products are all hydrate basic magnesium carbonate in the market. Compared with the prior art, the method fully realizes the single-phase composition of the anhydrous magnesium carbonate powder and besides fire retardant, the anhydrous magnesium carbonate powder can be used for various respects. The method is simple in technology and lower in production cost, and fills a gap in the production of the single-phase anhydrous magnesium carbonate powder.

Description

technical field [0001] The invention relates to a method for preparing anhydrous magnesium carbonate powder, which can prepare anhydrous magnesium carbonate powder with special flower-like and spherical shapes and composed of a single phase. Background technique [0002] Anhydrous magnesium carbonate, as an important part of magnesium series crystal materials, is mainly used in fireproof coatings, inks, pottery, glass, toothpaste, rubber fillers, etc. At present, the so-called magnesium carbonate products for short on the market are all hydrated basic magnesium carbonate except natural magnesite magnesium carbonate. In the existing domestic and foreign hydrated basic magnesium carbonate production processes, there is no special technology that can produce anhydrous magnesium carbonate composed of a single phase. Contents of the invention [0003] The problem to be solved by the present invention is that the anhydrous magnesium carbonate composed of a single phase cannot b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/24
Inventor 王晶
Owner DALIAN JIAOTONG UNIVERSITY
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