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Preparation method of heavy anhydrous magnesium carbonate and magnesium oxide

A technology of anhydrous magnesium carbonate and magnesium oxide, applied in the direction of magnesium carbonate, magnesium oxide, 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: 2017-01-04
徐强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Prepare single phase composition anhydrous magnesium carbonate. Its technological process comprises the following steps:

[0019] 1. Prepare 50ml of magnesium sulfate solution of 1.0mol / L, and prepare 50ml of ammonium carbonate solution according to the molar ratio of 1:2.2.

[0020] 2. Heat the magnesium sulfate solution and the ammonium carbonate solution to 50°C respectively, mix and stir them evenly.

[0021] 3. Stir the reaction solution for aging for one hour.

[0022] 4. The precipitate obtained by the reaction is washed and separated.

[0023] 5. The obtained white solid is baked at 280°C until the magnesium oxide content is greater than 46.5%. That is the finished product of anhydrous magnesium carbonate.

Embodiment 2

[0025] Prepare single phase composition anhydrous magnesium carbonate. Its technological process comprises the following steps:

[0026] 1. Prepare 50ml of magnesium acetate solution of 2.0mol / L, and prepare 50ml of ammonium carbonate solution according to the molar ratio of 1:2.5.

[0027] 2. Heat the magnesium acetate solution and the ammonium carbonate solution to 50°C respectively, mix and stir them evenly.

[0028] 3. Stir the reaction solution for aging for one hour.

[0029] 4. The precipitate obtained by the reaction is washed and separated.

[0030] 5. The obtained white solid is baked at 280°C until the magnesium oxide content is greater than 46.5%. That is the finished product of anhydrous magnesium carbonate.

Embodiment 3

[0032] Prepare single phase composition anhydrous magnesium carbonate. Its technological process comprises the following steps:

[0033] 1. Prepare 50 ml of magnesium sulfate solution of 1.0 mol / L, and prepare 50 ml of ammonium bicarbonate solution according to the molar ratio of 1: 2.2.

[0034] 2. Heat the magnesium sulfate solution and the ammonium bicarbonate solution to 50°C respectively, and mix and stir them evenly.

[0035] 3. Stir the reaction solution for aging for one hour.

[0036] 4. The precipitate obtained by the reaction is washed and separated.

[0037] 5. The obtained white solid is baked at 280°C until the magnesium oxide content is greater than 46.5%. That is the finished product of anhydrous magnesium carbonate.

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Abstract

The invention discloses a preparation method of anhydrous magnesium carbonate MgCO3 and magnesium oxide MgO. According to the preparation method, a water soluble magnesium salt is taken as a magnesium source, ammonium carbonate (NH4)2CO3 is taken as a precipitating agent, and ammonium magnesium carbonate (NH4)2Mg(CO3)2 is prepared at a reaction temperature ranging from 30 to 90 DEG C under hydrothermal reaction conditions; and ammonium magnesium carbonate is conversed into heavy anhydrous magnesium carbonate and magnesium oxide via high temperature pyrolyzing at different temperatures. The commercial magnesium carbonate products are all hydrated basic magnesium carbonate with apparent density of 0.15g / ml except magnesite magnesium carbonate. Compared with the prior art, the preparation method possesses following advantages: heavy anhydrous magnesium carbonate and magnesium oxide powder single phase composition is realized, apparent density is 0.6g / ml; the obtained product can be taken as a fire retardant, and can be applied to a plurality of fields; the preparation method is simple; production cost is relatively low; and production of single phase heavy anhydrous magnesium carbonate and magnesium oxide powder is disclosed for the first time.

Description

technical field [0001] The invention relates to a preparation method of heavy anhydrous magnesium carbonate and magnesium oxide, which can prepare anhydrous magnesium carbonate with a bulk density of 0.6g / ml. 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 hydrated basic magnesium carbonate production technology at home and abroad, there is still no special technology that can produce heavy anhydrous magnesium carbonate and magnesium oxide composed of a single phase under normal temperature and pressure. In addition, anhydrous magnesium carbonate has another important use. It is an important raw material for the production of TV s...

Claims

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Application Information

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IPC IPC(8): C01F5/24C01F5/06
Inventor 徐强
Owner 徐强
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