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Method for preparing porous and spherical basic magnesium carbonate crystal by utilizing magnesite

A magnesite and magnesium carbonate technology, applied in the direction of magnesium carbonate, can solve the problems of waste of resources and reduction of high-quality mineral resources, and achieve the effects of reducing preparation cost, reducing probability of occurrence and simple operation

Inactive Publication Date: 2017-10-24
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 preparing porous and spherical basic magnesium carbonate crystal by utilizing magnesite
  • Method for preparing porous and spherical basic magnesium carbonate crystal by utilizing magnesite
  • Method for preparing porous and spherical basic magnesium carbonate crystal by utilizing magnesite

Examples

Experimental program
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Effect test

Embodiment 1

[0053] A kind of method that utilizes magnesite to prepare porous spherical basic magnesium carbonate crystal, its process flow diagram is shown in figure 1 , including the following steps:

[0054] (1) Calcined magnesite

[0055] 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;

[0056] Grinding the activated magnesium oxide to -74 μm to obtain activated magnesium oxide powder;

[0057] (2) Digest and prepare Mg(OH) 2 suspension

[0058] 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;

[0059] Put the initial slurry of MgO in a constant temperature water bath at 60°C, stir for 3.5 hours, and air-cool to room tempera...

Embodiment 2

[0069] A method utilizing magnesite to prepare porous spherical magnesium basic carbonate crystals, comprising the steps of:

[0070] (1) Calcined magnesite

[0071] 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;

[0072] The activated magnesium oxide is pulverized into activated magnesium oxide powder with a particle size of -72 μm;

[0073] (2) Digest and prepare Mg(OH) 2 suspension

[0074] 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;

[0075] 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 suspension;

[0076] (3) Prepara...

Embodiment 3

[0083] A method utilizing magnesite to prepare porous spherical magnesium basic carbonate crystals, comprising the steps of:

[0084] (1) Calcined magnesite

[0085] 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;

[0086] Grinding activated magnesium oxide to activated magnesium oxide powder with a particle size of -70 μm;

[0087] (2) Digest and prepare Mg(OH) 2 suspension

[0088] 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;

[0089] 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;

[0090] (3) Preparation of precu...

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Abstract

The invention provides a method preparing a porous and spherical basic magnesium carbonate crystal by utilizing magnesite and belongs to the field of mineral processing. The preparing method comprises the steps that the magnesite is calcined to obtain active magnesium oxide powder; a Mg(OH)2 suspension is digested and prepared; CO2 is introduced to prepare a precursor solution Mg(HCO3)2; a NaOH solution is added into the precursor solution Mg(HCO3)2 to regulate a pH value, lauryl sodium sulfate is added into the Mg(OH)2 solution, and crystallization, thermal insulation, filtration, washing and drying are performed to obtain the porous and spherical basic magnesium carbonate crystal. The method uses the magnesite as a raw material, the magnesite is calcined to obtain the high-activity magnesium oxide, the lauryl sodium sulfate is used as a crystalline form control agent, and the porous and spherical basic magnesium carbonate crystal is prepared by adopting a hydration method under ordinary pressure. The prepared product has porous and spherical morphology and is high in purity, complete in crystal form and uniform in morphology.

Description

technical field [0001] The invention belongs to the field of mineral processing, and in particular relates to a method for preparing porous spherical basic magnesium carbonate crystals by using magnesite. Background technique [0002] Basic magnesium carbonate (4MgCO 3 ·Mg(OH) 2 4H 2 O) is an important inorganic mineral powder material, because of its good filling, fluidity, dispersibility, and excellent interface properties, high strength, high temperature resistance, flame retardant, fire prevention and smoke suppression, non-toxic, light weight, loose And other performance characteristics, are widely used in various fields such as rubber, paint, chemical industry, medicine, machinery, metallurgy, construction, environmental protection, etc., so it has received great attention at home and abroad. [0003] Due to the restriction of production process and technical cost, the preparation of basic magnesium carbonate has not been realized in large-scale production, so it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/24
CPCC01F5/24C01P2002/72C01P2004/03C01P2004/32C01P2004/61
Inventor 王余莲印万忠于洪浩赵晖唐宏欣
Owner SHENYANG LIGONG UNIV
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