Method for preparing nanometer magnesium oxide and active light calcium carbonate

A nano-magnesium oxide, active lightweight technology, applied in the field of preparation of inorganic non-metallic materials, can solve the problems of difficult to realize industrialized production, expensive equipment, complicated process, etc., and achieve the effects of improving utilization rate, improving digestion efficiency, and improving activity

Inactive Publication Date: 2010-02-17
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to overcome the problems of complex process, expensive equipment, high energy consumption and difficulty in realizing industrialized production in the prior art, and provid

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  • Method for preparing nanometer magnesium oxide and active light calcium carbonate

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0086] Example 1

[0087] The method for preparing nano-magnesium oxide includes the following steps:

[0088] 1. Crush the dolomite to a particle size of 2mm;

[0089] 2. The dolomite crushed to a particle size of 2mm is calcined in a heating furnace at 810°C for 3 hours, and a chemical reaction occurs. The chemical reaction formula is: CaMg(CO 3 ) 2 =CaCO 3 +MgO+CO 2 ↑, a mixture of magnesium oxide and calcium carbonate is obtained;

[0090] 3. Take a mixture of 60 grams of magnesium oxide and calcium carbonate, 1200 milliliters of 85°C deionized water and 900 grams of stainless steel balls, and add them to the ball mill tank for digestion reaction. The speed of the ball mill is controlled at 500 rpm and the reaction is completed after 75 minutes. The formula is: MgO+H 2 O=Mg(OH) 2 , Remove the residue to obtain a suspension;

[0091] 4. Add a second filtrate to the suspension to cool down, and when the suspension is cooled to 20°C, pour CO into the suspension 2 The furnace gas with ...

Example Embodiment

[0101] Example 2

[0102] The method for preparing nano-magnesium oxide includes the following steps:

[0103] 1. Crush the dolomite to a particle size of 5mm;

[0104] 2. The dolomite crushed to a particle size of 5mm is calcined in a heating furnace at 830°C for 2.5 hours, and a chemical reaction occurs. The chemical reaction formula is: CaMg(CO 3 ) 2 =CaCO 3 +MgO+CO 2 ↑, a mixture of magnesium oxide and calcium carbonate is obtained;

[0105] 3. Take a mixture of 60g of magnesium oxide and calcium carbonate, 1500ml of 90℃ deionized water and 1800g of stainless steel balls, and add them to the ball mill tank for digestion reaction. The speed of the ball mill is controlled at 300rpm, and the reaction is completed after 50 minutes. The formula is: MgO+H 2 O=Mg(OH) 2 , Remove the residue to obtain a suspension;

[0106] 4. Add deionized water to the suspension, let it cool to 30℃, and pour CO into the suspension 2 The furnace gas with a volume percentage of 28% is carbonized once, the g...

Example Embodiment

[0116] Example 3

[0117] 1. Crush the dolomite to a particle size of 0.6mm;

[0118] 2. The dolomite crushed to 0.6mm is calcined in a heating furnace at 870°C for 1.5 hours to obtain a mixture of magnesium oxide and calcium carbonate.

[0119] 3. Take a mixture of 60g of magnesium oxide and calcium carbonate, 2100ml of 87℃ deionized water and 1200g of stainless steel balls, and put them into the ball mill tank for digestion reaction. The speed of the ball mill is controlled at 400rpm, and the reaction is completed after 60min. The formula is: MgO+H 2 O=Mg(OH) 2 , Remove the residue to obtain a suspension;

[0120] 4. Add deionized water to the suspension, let it cool to 45℃, and pour CO into the suspension 2 The furnace gas with a volume percentage of 32% is carbonized once, and the gas pressure is controlled at 0.8MPa. Stir while passing in. When the pH of the solution reaches 6.8, the carbonization liquid is filtered. The filtrate is magnesium bicarbonate solution. The main compon...

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Abstract

The invention discloses a method for preparing nanometer magnesium oxide and active light calcium carbonate, aiming to solve the problems of expensive equipment, high energy consumption, material producing area limit, and the like in the prior art. The method for preparing the nanometer magnesium oxide comprises the following steps: smashing dolomites; calcining the dolomites at low temperature; ball-milling and slaking a mixture; primary carbonizing; primary filtering; pyrolyzing; secondary filtering; mechanically ball-milling; and calcining. The method for preparing the active light calciumcarbonate comprises the following steps: smashing the dolomites; calcining the dolomites at low temperature; ball-milling and slaking; primary carbonization; primary filtering; pulping filter residuesand secondary carbonizing; filtering and washing the filter residues; pulping and activating the filter residues; filtering; and drying. CO2 generated by calcining the dolomites at the low temperature is delivered to the primary carbonization and the secondary carbonization to be used; secondary filtering liquid containing magnesium, which is obtained by filtering pyrolyzed liquid, is delivered to the ball-milling and slaking process or theprimary carbonization process of the mixture to be continuously used; and the filtering liquid containing the magnesium and hot water washing liquid are delivered to the pyrolyzing process of the method for preparing the nanometer magnesium oxide to be continuously used.

Description

technical field [0001] The present invention relates to a kind of preparation method of inorganic non-metallic material, more specifically, the present invention relates to a kind of preparation method of nano magnesium oxide and active light calcium carbonate. Background technique [0002] The main component of dolomite is CaMg(CO 3 ) 2 , my country has large reserves of dolomite with excellent quality. Nano-magnesium oxide is a new type of functional fine inorganic material with the development of nano-material technology. Its particle size ranges from 1 to 100nm. It is widely used in advanced ceramic materials, electrical insulation materials, cosmetics, face powder, paint, rubber Fillers, acid gas adsorbents, catalyst carriers, effect pigments, sensing materials and stealth technology - radar wave absorbing materials and other fields have broad application prospects and huge economic potential. [0003] Light calcium carbonate is widely used in plastic films, chemical...

Claims

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Application Information

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IPC IPC(8): C01F5/06C04B2/10B82B3/00C01F11/18
Inventor 曹占义陈永弟庄建王冲康雅丽刘勇兵
Owner JILIN UNIV
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