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Environment-friendly preparation process of high-purity and superfine anhydrous magnesium carbonate

An anhydrous magnesium carbonate, environment-friendly technology, applied in the direction of magnesium carbonate, etc., can solve problems such as the inability to prepare high-purity ultrafine anhydrous magnesium carbonate, and achieve the effect of simple operation

Active Publication Date: 2016-08-24
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention solves the problem that high-purity ultrafine anhydrous magnesium carbonate cannot be prepared by traditional production methods at home and abroad

Method used

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  • Environment-friendly preparation process of high-purity and superfine anhydrous magnesium carbonate
  • Environment-friendly preparation process of high-purity and superfine anhydrous magnesium carbonate
  • Environment-friendly preparation process of high-purity and superfine anhydrous magnesium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of heavy magnesium water: After the hydration suspension of lightly burned powder is carbonized by carbon dioxide, add TMT-15 (organic sulfur heavy metal scavenger 1.3.5-triazine-2.4.6-trithiol trisodium salt, 15%) 120ppm , to remove iron ions and heavy metal impurities, and use a precision filter to separate the suspension from solid to liquid, remove solid impurities to obtain clear and transparent heavy magnesium water, the concentration of magnesium ions is 0.25mol / L, the content of iron ions is 30ppm, and the content of heavy metal ions is 5ppm.

[0025] Preparation of magnesium carbonate trihydrate by high-gravity technology: Heavy magnesium water is transported to the circulation tank of the high-gravity stator-rotor reactor, the stator-rotor reactor motor, circulation pump and blower or vacuum pump are started, and the heavy magnesium water enters the stator-rotor reactor Reverse contact with purified air strengthens the transfer process, decomposes t...

Embodiment 2

[0029] Preparation of heavy magnesium water: configure low-quality magnesium hydroxide powder into a slurry with a content of 22 g / liter, after carbon dioxide carbonization reaction, add TMT-15 (organic sulfur heavy metal scavenger 1.3.5-triazine-2.4.6 -trithiol trisodium salt, 15%) 120ppm, remove iron ions and heavy metal impurities, use a precision filter to separate the suspension from solid to liquid, remove solid impurities to obtain clear and transparent heavy magnesium water, the concentration of magnesium ions is 0.20mol / L , iron ion content is 30ppm, heavy metal ion 5ppm.

[0030] Preparation of magnesium carbonate trihydrate by high-gravity technology: heavy magnesium water is transported to the circulation tank of the high-gravity stator-rotor reactor, the motor and vacuum pump of the stator-rotor reactor are started, and the heavy magnesium water is decomposed to produce magnesium carbonate trihydrate precipitation and carbon dioxide, carbon dioxide Gas is exhauste...

Embodiment 3

[0032] Embodiment 3: The difference between the preparation operation steps and Example 1 is that the gas-liquid ratio of feeding air is 50, and the reaction time is 0.5 hour during the preparation of magnesium carbonate trihydrate. The obtained sample is single-phase anhydrous magnesium carbonate, the particles are uniform and well-dispersed, and the particle size is concentrated at about 2 μm. After chemical analysis, the contents of each substance in the powder are: magnesium oxide (MgO) = 47.1%, calcium oxide (CaO) =0.025%, iron (Fe 2 o 3 )=100ppm, heavy metal (calculated as Pb)≤10ppm, chloride≤100ppm, sulfate radical≤100ppm.

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Abstract

The invention discloses an environment-friendly preparation process of high-purity and superfine anhydrous magnesium carbonate and belongs to the field of inorganic chemical synthesis and inorganic materials. Light calcined powder or magnesium hydroxide is taken as a raw material, heavy magnesium water reversely contacts with purified air in a supergravity stator-rotor reactor after a carbonization reaction and removal of iron ions and heavy metal impurities (or heavy magnesium water is vacuumized), interphase transfer is reinforced, liquid-phase carbon dioxide is rapidly diffused to a gas phase, the magnesium bicarbonate is accelerated to be decomposed to generate magnesium carbonate trihydrate and carbon dioxide, magnesium carbonate trihydrate and carbon dioxide are mixed with an ammonium hydrogen carbonate solution with certain concentration after precipitation and filtration, a uniform sizing agent is prepared, a hydrothermal reaction is performed in a reactor, and loose single-phase high-purity and superfine anhydrous magnesium carbonate powder is obtained. The preparation process is environment-friendly, the raw materials are cheap, no organic additive is required in the production process, and high-purity and superfine anhydrous magnesium carbonate has wide application fields, has remarkable price and performance advantages and high market competitiveness and has remarkable innovativeness, economical efficiency and practicability.

Description

technical field [0001] The invention belongs to the field of inorganic chemical synthesis and inorganic materials, specifically relates to a new preparation process of high-purity ultrafine anhydrous magnesium carbonate, and is a new type of inorganic flame-retardant material for clean production, energy saving and emission reduction. Background technique [0002] Anhydrous magnesium carbonate is an important inorganic chemical material, widely used in engineering plastics and glass products. At present, the so-called magnesium carbonate products for short in the market, except for natural magnesite magnesium carbonate, are mostly hydrated basic magnesium carbonate. The product particles are coarse, the purity is not high, and there are many impurities, which seriously affect the application range and product market competitiveness. [0003] The difficulty in preparing single-phase magnesium carbonate is that the solubility of magnesium hydroxide is lower than that of magnes...

Claims

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Application Information

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IPC IPC(8): C01F5/24
CPCC01F5/24C01P2002/72C01P2004/03C01P2004/61C01P2006/80
Inventor 宋云华王英伟陈建铭
Owner BEIJING UNIV OF CHEM TECH
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