A kind of ultra-white composite sericite and preparation method thereof

Abstract

Provided is an ultra-white composite sericite product, which includes sericite as a base material or core, and a titanium dioxide layer, a magnesium oxide layer and a silicon dioxide layer coated sequentially on the surface of the sericite. Also provided is a method of preparing the ultra-white composite sericite product from gray sericite with low whiteness.

Description

technical field

[0001] The invention relates to a method for preparing ultra-white composite sericite from natural sericite with low whiteness (such as gray sericite) and a preparation method thereof, belonging to the field of new inorganic non-metallic materials. Background technique

[0002] Sericite is a kind of potassium aluminum silicate mineral produced in layer or sheet form. It is a subspecies of muscovite ore. It is muscovite produced in fine particles. It has all the physical and chemical properties of muscovite : Excellent insulation, good chemical stability (insoluble in acid and alkali at room temperature), high temperature resistance (dehydration at above 800 °C, becoming opaque), large diameter-thickness ratio, smooth surface, delicate and smooth hand feeling Soft, with a bright silky luster, the particle size of the monomer is between 2-10um, and it is in the shape of fine scales. It has good dispersibility, good covering rate, moderate particle size, and ha...

Examples

Embodiment 1

[0056] (1) Take 100g of gray sericite powder with a dry weight of 1-15 μm in particle size, put it into a 2L reaction kettle, add 1200 milliliters of deionized water, and stir to make it uniformly dispersed into a suspension;

[0057] (2) Heat the suspension in a constant temperature water bath and raise the temperature to 70°C. Adjust the pH of the suspension to 2.0 with hydrochloric acid solution, and add TiCl with a concentration of 2 mol / L 4 Solution 110ml (corresponding to TiO 2 With respect to the specific gravity of base material gray sericite powder (15%), the feeding can be stopped, and the pH value can be kept constant with liquid caustic soda solution. Stir at constant temperature for 30 minutes after stopping feeding;

[0058] (3) Keep the above temperature constant, adjust the pH of the suspension to 11 with liquid caustic soda solution, and add dropwise MgCl with a mass fraction of 15% in the solution 2 ·6H 2 O solution 840.8ml (corresponding MgO is 20% with ...

Embodiment 2

[0065] (1) Take 100g of gray sericite powder with a dry weight of 1-15 μm in particle size, put it into a 2L reaction kettle, add 1200 milliliters of deionized water, and stir to make it uniformly dispersed into a suspension;

[0066] (2) Heat the suspension in a constant temperature water bath and raise the temperature to 70°C. Adjust the pH of the suspension to 2.0 with hydrochloric acid solution, and add TiCl with a concentration of 2 mol / L 4 Solution 156.3ml (corresponding TiO 2 With respect to the proportion of base material gray sericite powder (20%), the feeding can be stopped, and the pH value can be kept constant with liquid caustic soda solution. Stir at constant temperature for 30 minutes after stopping feeding;

[0067] (3) Keep the above temperature constant, adjust the pH of the suspension to 11 with liquid caustic soda solution, and add dropwise MgCl with a mass fraction of 15% in the solution 2 ·6H 2 O solution 1120.9ml (corresponding MgO is 25% with respec...

Embodiment 3

[0074] (1) Take by weighing 100 g of gram dry weight particle diameter and be 1-15 μ m gray sericite powder, drop into a volume and be in the reactor of 2 L, add 1200 milliliters of deionized water, stir to make it evenly disperse into suspension;

[0075] (2) Heat the suspension in a constant temperature water bath and raise the temperature to 70°C. Adjust the pH of the suspension to 2.0 with hydrochloric acid solution, and add TiCl with a concentration of 2 mol / L 4 Solution 156.3ml (corresponding TiO 2 With respect to the proportion of base material gray sericite powder (20%), the feeding can be stopped, and the pH value can be kept constant with liquid caustic soda solution. Stir at constant temperature for 30 minutes after stopping feeding;

[0076] (3) Keep the above temperature constant, adjust the pH of the suspension to 11 with liquid caustic soda solution, and add dropwise MgSO with a mass fraction of 15% in the solution 4 ·7H 2 O solution 1747.5ml (corresponding ...

technical field

[0001] The invention relates to a method for preparing ultra-white composite sericite from natural sericite with low whiteness (such as gray sericite) and a preparation method thereof, belonging to the field of new inorganic non-metallic materials. Background technique

[0002] Sericite is a kind of potassium aluminum silicate mineral produced in layer or sheet form. It is a subspecies of muscovite ore. It is muscovite produced in fine particles. It has all the physical and chemical properties of muscovite : Excellent insulation, good chemical stability (insoluble in acid and alkali at room temperature), high temperature resistance (dehydration at above 800 °C, becoming opaque), large diameter-thickness ratio, smooth surface, delicate and smooth hand feeling Soft, with a bright silky luster, the particle size of the monomer is between 2-10um, and it is in the shape of fine scales. It has good dispersibility, good covering rate, moderate particle size, and ha...

Examples

Embodiment 1

[0056] (1) Take 100g of gray sericite powder with a dry weight of 1-15 μm in particle size, put it into a 2L reaction kettle, add 1200 milliliters of deionized water, and stir to make it uniformly dispersed into a suspension;

[0057] (2) Heat the suspension in a constant temperature water bath and raise the temperature to 70°C. Adjust the pH of the suspension to 2.0 with hydrochloric acid solution, and add TiCl with a concentration of 2 mol / L 4 Solution 110ml (corresponding to TiO 2 With respect to the specific gravity of base material gray sericite powder (15%), the feeding can be stopped, and the pH value can be kept constant with liquid caustic soda solution. Stir at constant temperature for 30 minutes after stopping feeding;

[0058] (3) Keep the above temperature constant, adjust the pH of the suspension to 11 with liquid caustic soda solution, and add dropwise MgCl with a mass fraction of 15% in the solution 2 ·6H 2 O solution 840.8ml (corresponding MgO is 20% with ...

Embodiment 2

[0065] (1) Take 100g of gray sericite powder with a dry weight of 1-15 μm in particle size, put it into a 2L reaction kettle, add 1200 milliliters of deionized water, and stir to make it uniformly dispersed into a suspension;

[0066] (2) Heat the suspension in a constant temperature water bath and raise the temperature to 70°C. Adjust the pH of the suspension to 2.0 with hydrochloric acid solution, and add TiCl with a concentration of 2 mol / L 4 Solution 156.3ml (corresponding TiO 2 With respect to the proportion of base material gray sericite powder (20%), the feeding can be stopped, and the pH value can be kept constant with liquid caustic soda solution. Stir at constant temperature for 30 minutes after stopping feeding;

[0067] (3) Keep the above temperature constant, adjust the pH of the suspension to 11 with liquid caustic soda solution, and add dropwise MgCl with a mass fraction of 15% in the solution 2 ·6H 2 O solution 1120.9ml (corresponding MgO is 25% with respec...

Embodiment 3

[0074] (1) Take by weighing 100 g of gram dry weight particle diameter and be 1-15 μ m gray sericite powder, drop into a volume and be in the reactor of 2 L, add 1200 milliliters of deionized water, stir to make it evenly disperse into suspension;

[0075] (2) Heat the suspension in a constant temperature water bath and raise the temperature to 70°C. Adjust the pH of the suspension to 2.0 with hydrochloric acid solution, and add TiCl with a concentration of 2 mol / L 4 Solution 156.3ml (corresponding TiO 2 With respect to the proportion of base material gray sericite powder (20%), the feeding can be stopped, and the pH value can be kept constant with liquid caustic soda solution. Stir at constant temperature for 30 minutes after stopping feeding;

[0076] (3) Keep the above temperature constant, adjust the pH of the suspension to 11 with liquid caustic soda solution, and add dropwise MgSO with a mass fraction of 15% in the solution 4 ·7H 2 O solution 1747.5ml (corresponding ...

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