Method for low temperature preparation of basic magnesium carbonate crystal with assistance of absolute ethanol

An anhydrous ethanol, magnesium carbonate technology, applied in magnesium carbonate, crystal growth, chemical instruments and methods, etc., can solve the problems of reduction of high-quality mineral resources, waste of resources, etc., and achieve the effects of reducing preparation cost, simple operation and wide source.

Active Publication Date: 2017-11-07
SHENYANG LIGONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, high-quality mineral resources have been drastically reduced due to mining of the rich, abandonment of the poor, and indiscriminate mining, and a large number of low-grade magnesites have been abandoned and piled up on land, resulting in a great waste of resources

Method used

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  • Method for low temperature preparation of basic magnesium carbonate crystal with assistance of absolute ethanol
  • Method for low temperature preparation of basic magnesium carbonate crystal with assistance of absolute ethanol
  • Method for low temperature preparation of basic magnesium carbonate crystal with assistance of absolute ethanol

Examples

Experimental program
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Effect test

Embodiment 1

[0054] A method for preparing basic magnesium carbonate crystals at low temperature with the assistance of absolute ethanol, the process flow diagram is shown in figure 1 , including the following steps:

[0055] (1) Calcined magnesite

[0056] The magnesite was calcined at 750°C for 3.0 hours, so that the decomposition rate of magnesite reached 99%, and active magnesium oxide was obtained. The activity was detected by the citric acid method, and the discoloration time was 30s;

[0057] Grinding the activated magnesium oxide to -74 μm to obtain activated magnesium oxide powder;

[0058] (2) Digest and prepare Mg(OH) 2 suspension

[0059] Using the obtained activated magnesia powder as raw material, add deionized water at 90°C, fully stir to prepare MgO initial slurry; wherein, according to the mass ratio, activated magnesia powder: deionized water = 1:40;

[0060] Put the initial slurry of MgO in a constant temperature water bath at 60°C, stir for 3.5 hours, and air-cool t...

Embodiment 2

[0068] A method for preparing basic magnesium carbonate crystals at low temperature under the assistance of dehydrated alcohol, comprising the steps of:

[0069] (1) Calcined magnesite

[0070] The magnesite was calcined at 700°C for 3.0 hours, so that the decomposition rate of magnesite was 98%, and active magnesium oxide was obtained. The activity was detected by the citric acid method, and the discoloration time was 28s;

[0071] The activated magnesium oxide is pulverized into activated magnesium oxide powder with a particle size of -72 μm;

[0072] (2) Digest and prepare Mg(OH) 2 suspension

[0073] Using the obtained activated magnesia powder as raw material, add deionized water at 70°C, fully stir to prepare MgO initial slurry; wherein, according to the mass ratio, activated magnesia powder: deionized water = 1:50;

[0074] Put the initial MgO slurry in a constant temperature water bath at 55°C, stir for 5.0 h, and air cool to room temperature to obtain Mg(OH) 2 sus...

Embodiment 3

[0081] A method for preparing basic magnesium carbonate crystals at low temperature under the assistance of dehydrated alcohol, comprising the steps of:

[0082] (1) Calcined magnesite

[0083] The magnesite was calcined at 800°C for 1.0h, so that the decomposition rate of magnesite was 99%, and active magnesium oxide was obtained. The activity was detected by the citric acid method, and the discoloration time was 30s;

[0084] Grinding activated magnesium oxide to activated magnesium oxide powder with a particle size of -70 μm;

[0085] (2) Digest and prepare Mg(OH) 2 suspension

[0086] Using the obtained activated magnesia powder as raw material, add deionized water at 100°C, fully stir to prepare MgO initial slurry; wherein, according to the mass ratio, activated magnesia powder: deionized water = 1:12;

[0087] Put the initial MgO slurry in a constant temperature water bath at 65°C, stir for 1.0 h, and air cool to room temperature to obtain Mg(OH) 2 suspension;

[00...

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Abstract

The invention provides a method for low temperature preparation of basic magnesium carbonate crystal with assistance of absolute ethanol, and belongs to the field of mineral processing. The method comprises the following steps: (1) magnesite is calcinated in order to obtain active magnesium oxide; (2) deionized water is added with fully stirring in order to prepare MgO initial slurry, and a Mg(OH)2 fluid suspension is prepared with digestion; (3) at 0-10 DEG C, CO2 gas is introduced, and a precursor solution Mg(HCO3)2 is prepared; (4) a NaOH solution is added, pH value is adjusted, absolute ethanol is added, at 40-65 DEG C, insulation is carried out for 60-120 minutes for pyrolysis of the precursor solution Mg(HCO3)2, and basic magnesium carbonate crystal is obtained. Magnesite is used as a raw material, magnesite is calcinated in order to obtain magnesium oxide of high activity, absolute ethanol is used as an auxiliary agent, and a hydration method is used at a normal pressure for low temperature preparation of the basic magnesium carbonate crystal. The products have high purity, complete crystal form, and uniform morphology.

Description

technical field [0001] The invention belongs to the field of mineral processing, and in particular relates to a method for preparing basic magnesium carbonate crystals at low temperature with the assistance of absolute ethanol. Background technique [0002] Basic magnesium carbonate (4MgCO 3 ·Mg(OH) 2 4H 2 O) is an important inorganic mineral material, which can exist stably under natural environmental conditions. Because of its good filling, fluidity, dispersibility, excellent interface properties and high strength, it can be used as a polymer polymer such as rubber and plastics. It is an excellent reinforcing agent and filler for materials, as well as a gas generating agent for automobile airbags; due to its characteristics of high temperature resistance, non-combustion, light texture and looseness, it is not only a kind of green environmental protection flame retardant, but also a kind of preparation of other fine An important intermediate raw material for magnesium sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/24C30B29/10C30B7/14
CPCC01F5/24C01P2002/72C01P2004/03C30B7/14C30B29/10
Inventor 王余莲印万忠赵晖于洪浩杨云川唐宏欣
Owner SHENYANG LIGONG UNIV
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