CN110283479B - Super-white composite sericite and preparation method thereof - Google Patents
Super-white composite sericite and preparation method thereof Download PDFInfo
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- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/28—Compounds of silicon
- C09C1/30—Silicic acid
- C09C1/3045—Treatment with inorganic compounds
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- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/28—Compounds of silicon
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- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/006—Combinations of treatments provided for in groups C09C3/04 - C09C3/12
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- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/04—Physical treatment, e.g. grinding, treatment with ultrasonic vibrations
- C09C3/043—Drying, calcination
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- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/06—Treatment with inorganic compounds
- C09C3/063—Coating
Abstract
An ultra-white composite sericite product is provided, which comprises sericite as a base material or a core, and a titanium dioxide layer, a magnesium oxide layer and a silicon dioxide layer which are sequentially coated on the surface of the sericite. Also provided is a method for preparing the ultra-white composite sericite product from low-whiteness gray sericite.
Description
Technical Field
The invention relates to an ultra-white composite sericite prepared from natural sericite (such as grey sericite) with low whiteness and a preparation method thereof, belonging to the field of inorganic non-metallic new materials.
Background
Sericite is a kind of potassium aluminosilicate mineral produced in a layered or flaky form, is a subspecies of muscovite mineral, is muscovite produced in fine particles, and has all the physicochemical characteristics of muscovite: excellent insulating property, good chemical stability (being insoluble in acid and alkali at normal temperature), high temperature resistance (being dehydrated at the temperature of more than 800 ℃ and becoming opaque), large diameter-thickness ratio, smooth surface, fine, smooth and soft hand feeling, bright silky luster, and fine scaly monomer granularity of 2-10 um. The dispersion is good, the covering rate is good, the granularity is moderate, and the kaolin-like characteristics are achieved; fine and smooth feeling, strong adhesion and talc property, so sericite has wide application. Fine, smooth and good skin feeling, and is used as cosmetic filler with ultraviolet shielding function; the sheet structure has a reinforcing effect and is used for reinforcing and modifying plastics, so that the rigidity and the bending resistance of the plastic product can be greatly improved; the sheet structure has good water vapor barrier property and is used for anticorrosive paint; has the reinforcing function, and can partially replace carbon black and white carbon black for reinforcing rubber; bright and fine gloss and yellowing resistance and is used for paper coating; the natural white degree is generally only about 60 or so, the storage amount of the ores is huge, and the ores have no application value due to low white degree. Therefore, the key core technical problem of the industry is to improve the whiteness of the gray sericite and realize the high added value of low-value or non-application-value sericite ore resources. No special literature or technical patent is found to solve the problems.
Disclosure of Invention
The inventors have conducted intensive studies in view of the deficiencies of the prior art, and as a result, have found that an ultra-white composite sericite is obtained by coating a gray sericite powder with a plurality of layers of oxides having high whiteness, good hiding power, and stable chemical properties.
The present invention aims to prepare high-whiteness ultra-white composite sericite by using low-whiteness sericite such as gray sericite.
According to a first embodiment of the present invention, there is provided ultra-white composite sericite comprising sericite (e.g., natural sericite or natural gray sericite) as a base material or a core, and a titanium dioxide layer, a magnesium oxide layer and a silicon dioxide layer coated on the surface of the sericite in this order.
In general, the average particle diameter of the powder of the raw material sericite (for example, natural sericite or natural gray sericite) used as the substrate or the core is 0.5 to 60 μm, preferably 0.8 to 50 μm, more preferably 1 to 40 μm, more preferably 1.5 to 35 μm, more preferably 1.8 to 30 μm, more preferably 2 to 20 μm, more preferably 2 to 15 μm.
Preferably, the sericite raw material used as the substrate or the core in the present invention is a powder of natural sericite (e.g., gray sericite) having a low whiteness (e.g., a whiteness of less than 60, e.g., a whiteness in the range of 20 to 60, e.g., a whiteness of 30, 35, 40 or 55).
Preferably, in the ultra-white composite sericite of the present invention, the weight ratio of the titanium dioxide layer to the weight of the sericite (e.g., gray sericite) powder substrate is 3 to 30%, preferably 5 to 25%, 10 to 28%, more preferably 15 to 20%.
Preferably, in the ultra-white composite sericite of the present invention, the weight ratio of the magnesium oxide layer to the weight of the sericite (e.g., gray sericite) powder substrate is 5 to 50%, preferably 10 to 40%, 15 to 35%, more preferably 20 to 30%; and/or
Preferably, in the ultra-white composite sericite of the present invention, the weight ratio of the silica layer to the weight of the sericite (e.g., gray sericite) powder substrate is 0.1 to 10%, preferably 0.5 to 9.0%, 1 to 8%, more preferably 1.5 to 7%.
According to a second embodiment of the present invention, there is also provided a method for preparing the above ultra-white composite sericite, comprising the steps of:
(1) stirring and mixing a sericite raw material substrate and deionized water to obtain a sericite suspension;
(2) coating a titanium dioxide layer on sericite in the sericite suspension by using a titanium salt solution corresponding to the titanium dioxide;
(3) further coating the sericite in the suspension obtained in the step (2) with a magnesium salt solution corresponding to magnesium oxide;
(4) further coating the sericite in the suspension obtained in the step (3) with a silica layer using a solution of a silicate or metasilicate corresponding to silica; and
(5) and (4) filtering, washing, drying and calcining the suspension obtained in the step (4) to obtain the ultra-white composite sericite powder with an ultra-white effect.
More specifically, the present invention provides a method for preparing the above ultra-white composite sericite, which comprises the steps of:
(1) 100 parts by weight of sericite raw material base material and deionized water are stirred and mixed to obtain a sericite suspension with a solid-to-liquid ratio of 1 (4-35), preferably 1 (5-30), more preferably 1 (7-25), more preferably 1 (10-20);
(2) heating the suspension of step (1) to a temperature of 40-100 ℃ (preferably 50-90 ℃, preferably 60-85 ℃, more preferably 70-80 ℃) and adjusting the pH of the suspension with an acid in the range of 0.5-5.5, preferably in the range of 1-5, more preferably in the range of 1.5-4, more preferably in the range of 1.5-3.5; then, a titanium salt solution corresponding to titanium dioxide is added to the suspension to react and the suspension is stirred continuously (for example, for 3 minutes to 5 hours, such as for 30 to 40 minutes) after the addition of the titanium salt solution is completed, so as to obtain a suspension containing a sericite coated with a titanium dioxide layer on the surface; wherein the titanium salt solution is added in an amount such that the weight ratio of the titanium dioxide layer to the weight of the sericite (e.g., gray sericite) powder substrate in the ultra-white composite sericite product is 3 to 30% (preferably 5 to 25%, 10 to 28%, more preferably 15 to 20%); preferably, the pH of the suspension is maintained stable or substantially stable during the above-described addition and reaction with a base, for example, to a pH value in the range of 0.5 to 5.5 (preferably in the range of 1 to 5, more preferably in the range of 1.5 to 4, more preferably in the range of 1.5 to 3.5);
(3) adjusting the pH of the suspension obtained in the step (2) to 4.5 to 14.0 (preferably 5.5 to 13.0, more preferably 6.0 to 12.5, more preferably 7.0 to 12.0, more preferably 8.0 to 11.0) with a base at a temperature at which the suspension is maintained at 40 to 100 ℃ (preferably 50 to 90 ℃, preferably 60 to 85 ℃, more preferably 70 to 80 ℃), then adding a magnesium salt solution corresponding to magnesium oxide to the suspension for reaction and continuing stirring the suspension after the end of the addition of the magnesium salt solution (for example, 3 minutes to 5 hours, such as 30 to 40 minutes), so as to obtain a suspension containing sericite further coated with a magnesium oxide layer on the titanium dioxide coating layer of sericite; wherein the magnesium salt solution is added in an amount such that the weight ratio of the magnesium oxide layer to the weight of the sericite (e.g., gray sericite) powder substrate in the ultra-white composite sericite product is 5 to 50% (preferably 10 to 40%, 15 to 35%, more preferably 20 to 30%); preferably, the pH of the suspension is maintained stable or substantially stable during the above-mentioned addition and reaction with a base and an acid, respectively, for example, to a pH of 4.5 to 14.0 (preferably 5.5 to 13.0, more preferably 6.0 to 12.5, more preferably 7.0 to 12.0, more preferably 8.0 to 11.0);
(4) adjusting the pH of the suspension obtained in step (3) to 4.5 to 12.0 (preferably 5.0 to 11.5, more preferably 6.0 to 11, more preferably 6.5 to 10.0, more preferably 7.0 to 9.0) with an acid or a base while maintaining the suspension at a temperature in the range of 40 to 100 ℃ (preferably 50 to 90 ℃, preferably 60 to 85 ℃, more preferably 70 to 80 ℃); then adding a solution of silicate or metasilicate corresponding to silica to the suspension to carry out a reaction, wherein the solution of silicate or metasilicate is added in an amount such that the weight ratio of the silica layer to the weight of sericite (e.g., gray sericite) powder substrate in the ultra-white composite sericite product is 0.1 to 10% (preferably 0.5 to 9.0%, 1 to 8%, more preferably 1.5 to 7%), preferably, the pH of the suspension is kept stable or substantially stable with alkali and acid, respectively, during the addition and the reaction, for example, the pH is kept stable at 4.5 to 12.0 (preferably 5.0 to 11.5, more preferably 6.0 to 11, more preferably 6.5 to 10.0, more preferably 7.0 to 9.0); and, after the addition of the solution of silicate or metasilicate is finished, continuing stirring the suspension (for example, 3 minutes to 5 hours, such as 30 to 40 minutes) by adjusting the pH of the suspension in the range of 7.5 to 11 (preferably, 8.0 to 10, more preferably, 8.5 to 9.5) with a base to obtain a suspension containing sericite further coated with a silica layer on the magnesium oxide coating layer of sericite; and
(5) and (4) filtering, washing, drying and calcining the suspension obtained in the step (4) to obtain the ultra-white composite sericite powder product with an ultra-white effect. The whiteness of the ultra-white compound sericite powder product is higher than 75, more preferably higher than 80, and more preferably higher than 84.
Preferably, the acid for adjusting pH is used in the form of a solution, and the acid solution is one or more selected from a hydrochloric acid solution, a sulfuric acid solution, a phosphoric acid solution, or a nitric acid solution.
Preferably, the base for adjusting pH is used in the form of a solution, and the base solution is one or more selected from the group consisting of a sodium hydroxide solution, a potassium hydroxide solution, a sodium carbonate solution, a potassium carbonate solution, and an aqueous ammonia solution.
Preferably, the titanium salt solution corresponding to titanium dioxide is selected from TiCl4、Ti2(SO4)3And TiOSO4A solution of one or more titanium salts of (a).
Preferably, the magnesium salt solution corresponding to magnesium oxide is selected from MgSO4、MgCl2And Mg (NO)3)2A solution of one or more titanium salts of (a).
Preferably, the silicate or metasilicate solution corresponding to the silica is composed of a compound selected from Na2SiO3、K2SiO3And MgSiO3A solution of one or more salts of (a).
Preferably, in the above method, the drying is performed at a temperature of 80 to 180 deg.C (preferably 100-150 deg.C, more preferably 110-130 deg.C) for 1 to 6 hours, more preferably 3 to 5 hours.
Preferably, the calcination is carried out at a temperature of 500 ℃ to 900 ℃ (preferably 600-800 ℃, more preferably 650-750 ℃) for 5 minutes to 30 minutes, more preferably 10 to 15 minutes.
In the present application, "keeping the pH of the suspension stable or substantially stable" means: the pH of the suspension is maintained stable within ± 1 of the set pH, more preferably within ± 0.5 of the set pH.
The invention provides an ultra-white composite sericite which is characterized in that the sericite is taken as a core, titanium dioxide, magnesium oxide and silicon dioxide are sequentially coated on the surface of the sericite, the whiteness is more than or equal to 75, and the composite sericite has good covering, stable chemical performance, bright and soft luster and good ultraviolet shielding function.
Wherein the particle size of the gray sericite powder is 1-10 μm, 1-15 μm, 10-30 μm, 10-60 μm, preferably 1-10 μm, 1-15 μm, 10-30 μm, more preferably 1-15 μm.
Wherein the respective weights of the titanium dioxide, magnesium oxide and silicon dioxide oxide layers are as follows:
the weight of titanium dioxide relative to the gray sericite powder substrate is 3 to 30%, preferably 5 to 25%, 10 to 28%, more preferably 15 to 20%;
the weight of magnesium oxide relative to the gray sericite powder substrate is 5 to 50%, preferably 10 to 40%, 15 to 35%, more preferably 20 to 30%.
The silica is 0.1 to 10%, preferably 0.5 to 9.0%, 1 to 8%, more preferably 1.5 to 7% by weight relative to the gray sericite powder substrate;
the invention also aims to provide a preparation method for preparing the ultrawhite composite sericite, which comprises the following steps:
(1) mixing 100 parts of base material with deionized water to form a mixture with a solid-to-liquid ratio of 1: (5 to 25), preferably 1: (5-20), more preferably 1: (10-20) and uniformly stirring the suspension.
(2) The temperature is raised to 60-90 deg.C, preferably 65-85 deg.C, more preferably 70-80 deg.C. The pH of the suspension is adjusted to 0.5 to 5.0, preferably 1.0 to 4.0, more preferably 1.5 to 3.5 with an acid solution, a titanium salt solution corresponding to titanium dioxide is added at a concentration of 2mol/L until the specific gravity of titanium dioxide with respect to the substrate is 15 to 20%, the addition is stopped, and the pH is kept constant with an alkali solution. Stirring at constant temperature (e.g., 5 minutes to 1 hour, preferably about 40 minutes, more preferably 30 minutes) after the addition is stopped;
(3) keeping the temperature unchanged, adjusting the pH value of the suspension to 4.0-14.0, preferably 6.0-12.0, more preferably 8.0-11 by using an alkali solution, dropwise adding a magnesium salt solution corresponding to magnesium oxide with the mass fraction of 5-35%, preferably 10-30%, more preferably 15-25% to the solution until the specific gravity of the magnesium oxide relative to the base material is 20-30%, stopping feeding, and simultaneously keeping the pH value of the solution constant by using the alkali solution and the acid solution. The reaction is carried out until the required ultra-white color phase is achieved, the constant-temperature stirring is carried out for 30 minutes after the feeding is stopped.
(4) Adjusting the pH value of the suspension to 5.0-11.0, preferably 6.0-10.0, more preferably 7.0-9.0 by using acid or alkali solution, adding 5-35%, preferably 10-30%, more preferably 15-25% of silicon salt solution corresponding to silicon dioxide by mass, keeping the pH value constant by using alkali solution and acid solution, adjusting the pH value to 8.0-10.0 by using alkali solution after the addition is finished, and stirring at constant temperature (for example, 5 minutes-1 hour, preferably about 35 minutes);
(5) and (4) filtering, washing, drying and calcining the solution obtained in the step (4) to obtain the ultra-white composite sericite powder with an ultra-white effect.
Wherein, the acid solution can be hydrochloric acid, sulfuric acid and/or any combination solution thereof;
the alkali in the alkali solution can be sodium hydroxide, ammonia water, sodium carbonate and/or solution of any combination thereof, for example, the alkali solution is sodium hydroxide or ammonia water or aqueous solution of sodium carbonate, such as 5-30% sodium carbonate solution, or 5-30% ammonia water.
The titanium salt solution corresponding to the titanium dioxide can be TiCl4、Ti2(SO4)3、TiOSO4And/or any combination thereof.
The magnesium salt solution corresponding to magnesium oxide can be MgSO4、MgCl2、Mg(NO3)2And/or any combination thereof.
The solution of silicon salt corresponding to silicon dioxide can be Na2SiO3、K2SiO3、MgSiO3And/or any combination thereof.
The drying is, for example, drying at 80-180 deg.C, preferably at about 100-150 deg.C for 1-6 hours, more preferably at 110-130 deg.C for about 3-5 hours.
Calcination is, for example, from about 500 ℃ to about 900 ℃, preferably about 600 ℃ to about 800 ℃ for 5 minutes to about 30 minutes, more preferably about 650 ℃ to about 750 ℃ for 10 minutes.
The whiteness of the powder of the ultrawhite composite sericite prepared by the method is more than or equal to 75, preferably more than or equal to 78, and more preferably more than or equal to 80.
The invention has the beneficial technical effects that:
the super-white composite sericite powder prepared by the invention is obtained by sequentially coating titanium dioxide, magnesium oxide and silicon dioxide layer oxides on the surface of gray sericite powder, and the whiteness effect can be changed by changing the thickness of a coating layer.
The whiteness of the gray sericite is improved from about 60 to over 75 by the ultrawhite composite sericite powder, so that the gray sericite without application value realizes high added value. In particular, the product obtained by coating the multilayer oxide has better ultraviolet shielding effect and is particularly suitable for cosmetics.
Detailed Description
The present invention will be described in further detail with reference to the following examples, but the present invention is not limited to these examples.
Example 1
(1) Weighing 100g dry weight of gray sericite powder with the particle size of 1-15 mu m, putting the gray sericite powder into a reaction kettle with the volume of 2L, adding 1200 ml of deionized water, and stirring to uniformly disperse the mixture into suspension;
(2) the suspension was heated in a constant temperature water bath and warmed to 70 ℃. The pH of the suspension was adjusted to 2.0 with hydrochloric acid solution, and TiCl was added at a concentration of 2mol/L4110ml of solution (corresponding TiO)2The specific gravity of the gray sericite powder relative to the substrate is 15 percent), the feeding can be stopped, and the pH value is kept constant by using a liquid alkali solution. Stirring for 30 minutes at constant temperature after stopping feeding;
(3) keeping the temperature unchanged, adjusting the pH of the suspension to 11 by using a liquid alkali solution, and dropwise adding MgCl with the mass fraction of 15% into the solution2·6H2840.8ml of O solution (corresponding to a specific gravity of MgO relative to the gray sericite powder of the substrate) were added, and the pH of the solution was kept constant with a liquid alkali solution and a hydrochloric acid solution. After the addition was stopped, the mixture was stirred at constant temperature for 30 minutes.
(4) The pH of the suspension was adjusted to 8.5 with hydrochloric acid solution, and 15% by mass of Na was added2SiO3·9H2O solution 97.76ml (corresponding to SiO)2The specific gravity of the gray sericite powder relative to the base material is 3 percent), the pH value is kept constant by using a liquid alkali solution and a hydrochloric acid solution, after the feeding is finished, the pH value is adjusted to 10.0 by using the liquid alkali solution, and the constant-temperature stirring is carried out for 35 minutes);
(5) and (4) filtering and washing the solution obtained in the step (4), drying at 120 ℃ for 3 hours, and calcining at 700 ℃ for 10 minutes to obtain the ultrawhite composite sericite powder with an ultrawhite effect.
Coating rate of the obtained sample:
wherein the TiO is2％＝15％，MgO％＝20％，SiO2％＝3％，
The whiteness of the obtained sample is as follows: 78 (original gray sericite powder base material whiteness: 50)
Example 2
(1) Weighing 100g dry weight of gray sericite powder with the particle size of 1-15 mu m, putting the gray sericite powder into a reaction kettle with the volume of 2L, adding 1200 ml of deionized water, and stirring to uniformly disperse the mixture into suspension;
(2) the suspension was heated in a constant temperature water bath and warmed to 70 ℃. The pH of the suspension was adjusted to 2.0 with hydrochloric acid solution, and TiCl was added at a concentration of 2mol/L4156.3ml of solution (corresponding TiO)2The specific gravity of the gray sericite powder relative to the substrate is 20%), the feeding can be stopped, and the pH value is kept constant by using a liquid alkali solution. Stirring for 30 minutes at constant temperature after stopping feeding;
(3) keeping the temperature unchanged, adjusting the pH of the suspension to 11 by using a liquid alkali solution, and dropwise adding MgCl with the mass fraction of 15% into the solution2·6H21120.9ml of O solution (corresponding to a specific gravity of MgO relative to the gray sericite powder of the substrate) were added with a liquid alkali solution and a hydrochloric acid solution while keeping the pH of the solution constant. After the addition was stopped, the mixture was stirred at constant temperature for 30 minutes.
(4) The pH of the suspension was adjusted to 8.5 with hydrochloric acid solution, and 15% by mass of Na was added2SiO3·9H2O solution 131.50ml (corresponding to SiO)2The specific gravity of the gray sericite powder relative to the base material is 4%), liquid alkali solution and hydrochloric acid solution are used for keeping the pH value constant, after the feeding is finished, the liquid alkali solution is used for adjusting the pH value to 10.0, and the constant-temperature stirring is carried out for 35 minutes);
(5) and (4) filtering and washing the solution obtained in the step (4), drying at 120 ℃ for 3.5 hours, and calcining at 700 ℃ for 10 minutes to obtain the ultra-white composite sericite powder with the ultra-white effect.
Coating rate of the obtained sample:
wherein the TiO is2％＝20％，MgO％＝25％，SiO2％＝4％，
The whiteness of the obtained sample is as follows: 80 (original gray sericite powder base material whiteness: 50)
Example 3
(1) Weighing 100g dry weight of gray sericite powder with the particle size of 1-15 mu m, putting the gray sericite powder into a reaction kettle with the volume of 2L, adding 1200 ml of deionized water, and stirring to uniformly disperse the mixture into suspension;
(2) the suspension was heated in a constant temperature water bath and warmed to 70 ℃. The pH of the suspension was adjusted to 2.0 with hydrochloric acid solution, and TiCl was added at a concentration of 2mol/L4156.3ml of solution (corresponding TiO)2The specific gravity of the gray sericite powder relative to the substrate is 20%), the feeding can be stopped, and the pH value is kept constant by using a liquid alkali solution. Stirring for 30 minutes at constant temperature after stopping feeding;
(3) keeping the temperature constant, adjusting the pH of the suspension to 11 with a liquid alkali solution, and adding dropwise MgSO 15% by mass4·7H21747.5ml of O solution (corresponding to a specific gravity of MgO relative to the gray sericite powder of the substrate) were added, and the pH of the solution was kept constant with a liquid alkali solution and a hydrochloric acid solution. After the addition was stopped, the mixture was stirred at constant temperature for 30 minutes.
(4) The pH of the suspension was adjusted to 8.5 with hydrochloric acid solution, and 15% by mass of Na was added2SiO3·9H2O solution 165.88ml (corresponding to SiO)2The specific gravity of the gray sericite powder relative to the base material is 5 percent), the pH value is kept constant by using a liquid alkali solution and a hydrochloric acid solution, after the feeding is finished, the pH value is adjusted to 10.0 by using the liquid alkali solution, and the constant-temperature stirring is carried out for 35 minutes);
(5) and (4) filtering and washing the solution obtained in the step (4), drying at 120 ℃ for 4 hours, and calcining at 750 ℃ for 10 minutes to obtain the super-white composite sericite powder with the super-white effect.
Coating rate of the obtained sample:
wherein the TiO is2％＝20％，MgO％＝30％，SiO2％＝5％，
The whiteness of the obtained sample is as follows: 84 (original gray sericite powder base material whiteness: 50)
TABLE 1
As can be seen from Table 1, TiO is coated on the original gray sericite powder in turn2、MgO、SiO2After that, the whiteness is increased,and as the coating rate increases, the whiteness also increases.
Claims (19)
1. The super-white composite sericite comprises sericite as a base material, and a titanium dioxide layer, a magnesium oxide layer and a silicon dioxide layer which are sequentially coated on the surface of the sericite;
in the ultrawhite composite sericite, the weight ratio of the titanium dioxide layer to the weight of the sericite powder substrate is 3 to 30%;
in the ultrawhite composite sericite, the weight ratio of the magnesium oxide layer to the weight of the sericite powder substrate is 5 to 50 percent;
in the ultra-white composite sericite, the weight ratio of the silica layer to the weight of the sericite powder substrate is 0.1 to 10%;
wherein the whiteness of the powder of the ultrawhite composite sericite is more than or equal to 75.
2. The ultra-white composite sericite according to claim 1, wherein the average particle size of the powder of the sericite raw material used as a substrate is 0.5 to 60 μm.
3. The ultra-white composite sericite according to claim 1, wherein the average particle size of powder of a sericite raw material used as a substrate is 1 to 40 μm.
4. The ultra-white composite sericite according to claim 1, wherein the average particle size of powder of a sericite raw material used as a substrate is 2 to 15 μm.
5. The ultra-white composite sericite according to claim 1 or 2, wherein the sericite raw material is a powder of gray sericite having a whiteness of less than 60.
6. The ultra-white composite sericite according to claim 1 or 2, wherein the sericite raw material is a powder of gray sericite having a whiteness of 20 to 60; and/or
The whiteness of the powder of the ultra-white composite sericite is more than or equal to 80.
7. The ultra-white composite sericite according to any one of claims 1 to 4, wherein in the ultra-white composite sericite, the weight ratio of the titanium dioxide layer with respect to the weight of the sericite powder substrate is 5 to 25%;
in the ultrawhite composite sericite, the weight ratio of the magnesium oxide layer to the weight of the sericite powder substrate is 10 to 40 percent;
in the ultra-white composite sericite, the weight ratio of the silica layer to the weight of the sericite powder substrate is 0.5 to 9.0%.
8. The ultra-white composite sericite according to any one of claims 1 to 4, wherein in the ultra-white composite sericite, the weight ratio of the titanium dioxide layer with respect to the weight of the sericite powder substrate is 10 to 28%;
in the ultrawhite composite sericite, the weight ratio of the magnesium oxide layer to the weight of the sericite powder substrate is 15 to 35 percent;
in the ultra-white composite sericite, the weight ratio of the silica layer to the weight of the sericite powder substrate is 1 to 8%.
9. The ultra-white composite sericite according to any one of claims 1 to 4, wherein in the ultra-white composite sericite, the weight ratio of the titanium dioxide layer with respect to the weight of the sericite powder substrate is 15 to 20%;
in the ultrawhite composite sericite, the weight ratio of the magnesium oxide layer to the weight of the sericite powder substrate is 20 to 30%;
in the ultra-white composite sericite, the weight ratio of the silica layer to the weight of the sericite powder substrate is 1.5 to 7%.
10. A method for preparing the ultra-white composite sericite according to any one of claims 1 to 9, comprising the steps of:
(1) stirring and mixing a sericite raw material substrate and deionized water to obtain a sericite suspension;
(2) coating a titanium dioxide layer on sericite in the sericite suspension by using a titanium salt solution corresponding to the titanium dioxide;
(3) further coating the sericite in the suspension obtained in the step (2) with a magnesium salt solution corresponding to magnesium oxide;
(4) further coating the sericite in the suspension obtained in the step (3) with a silica layer using a solution of a silicate or metasilicate corresponding to silica; and
(5) and (4) filtering, washing, drying and calcining the suspension obtained in the step (4) to obtain the ultra-white composite sericite powder with an ultra-white effect.
11. The method of claim 10, comprising the steps of:
(1) stirring and mixing 100 parts by weight of sericite raw material base material and deionized water to obtain a sericite suspension with a solid-to-liquid ratio of 1: 4-35;
(2) heating the suspension obtained in the step (1) to a temperature of 40-100 ℃, and adjusting the pH value of the suspension to 0.5-5.5 by using acid; then, a titanium salt solution corresponding to titanium dioxide is added to the suspension to react and the suspension is continuously stirred after the addition of the titanium salt solution is completed, so as to obtain a suspension containing sericite coated with a titanium dioxide layer on the surface;
(3) adjusting the pH of the suspension obtained in the step (2) to 4.5-14.0 with a base at a temperature at which the suspension is maintained in the range of 40-100 ℃, then adding a magnesium salt solution corresponding to magnesium oxide to the suspension to perform a reaction and continuing stirring the suspension after the end of the addition of the magnesium salt solution, so as to obtain a suspension containing sericite further coated with a magnesium oxide layer on the titanium dioxide coating layer of sericite;
(4) adjusting the pH of the suspension obtained in step (3) to 4.5-12.0 with an acid or a base while maintaining the suspension at a temperature in the range of 40-100 ℃; then adding a solution of silicate or metasilicate corresponding to the silicon dioxide into the suspension for reaction; and, after the addition of the solution of silicate or metasilicate is finished, continuing stirring the suspension by adjusting the pH of the suspension with a base to a range of 7.5 to 11 to obtain a suspension containing sericite further coated with a silica layer on the magnesium oxide coating layer of sericite; and
(5) and (4) filtering, washing, drying and calcining the suspension obtained in the step (4) to obtain the ultra-white composite sericite powder with an ultra-white effect.
12. The method according to claim 11, wherein the sericite suspension in a solid-to-liquid ratio of 1: 5-30 is obtained in step (1), the suspension of step (1) is heated to a temperature of 60-85 ℃ and the pH of the suspension is adjusted with an acid in a range of 1.5-4 in step (2), the suspension obtained in step (3) is maintained at a temperature in a range of 60-85 ℃ in step (4), the pH of the suspension is adjusted with an acid or a base to 6.5-10, and after the addition of the solution of silicate or metasilicate is finished, the suspension is continuously stirred by adjusting the pH of the suspension with a base in a range of 8.0-10.
13. The method according to claim 11, wherein a sericite suspension having a solid-to-liquid ratio of 1: 10-20 is obtained in step (1), the suspension of step (1) is heated to a temperature of 70-80 ℃ and the pH of the suspension is adjusted to a range of 1.5-3.5 with an acid in step (2), the suspension obtained in step (3) is maintained at a temperature of 70-80 ℃ in step (4), the pH of the suspension is adjusted to a range of 7.0-9.0 with an acid or an alkali, and after the addition of the solution of silicate or metasilicate is finished, the suspension is continuously stirred by adjusting the pH of the suspension to a range of 8.5-9.5 with an alkali.
14. The process of claim 11, wherein in step (2), the pH of the suspension is maintained stable with a base in the range of 0.5-5.5 during the feeding and the reaction; and/or
Wherein in step (3), the pH of the suspension is kept stable at 4.5-14.0 during the addition and the reaction with a base and an acid, respectively; and/or
Wherein in step (4), the pH of the suspension is kept stable at 4.5-12.0 during the addition and the reaction with a base and an acid, respectively.
15. The process of claim 14, wherein in step (2), the pH of the suspension is maintained stable with a base during the feeding and the reaction in the range of 1.5 to 4; and/or
Wherein in step (3), the pH of the suspension is kept stable at 7.0-12.0 during the addition and the reaction with a base and an acid, respectively; and/or
Wherein in step (4), the pH of the suspension is kept stable at 6.5-10.0 during the addition and the reaction with a base and an acid, respectively.
16. The method according to claim 14, wherein in step (2), the pH value of the suspension is kept stable in the range of 1.5-3.5 with the base during the feeding and the reaction; and/or
Wherein in step (3), the pH of the suspension is kept stable at 8.0-11.0 during the addition and the reaction with a base and an acid, respectively; and/or
Wherein in step (4), the pH of the suspension is kept constant between 7.0 and 9.0 during the addition and the reaction with a base and an acid, respectively.
17. The method according to claim 11, wherein the acid for adjusting pH is used in the form of a solution selected from one or more of a hydrochloric acid solution, a sulfuric acid solution, a phosphoric acid solution, or a nitric acid solution; and/or
Wherein the base for adjusting pH is used in the form of a solution, and the alkali solution is one or more selected from the group consisting of a sodium hydroxide solution, a potassium hydroxide solution, a sodium carbonate solution, a potassium carbonate solution, and an aqueous ammonia solution.
18. The method of claim 10 or 11, wherein:
the titanium salt solution corresponding to titanium dioxide is prepared from TiCl4、Ti2(SO4)3And TiOSO4A solution of one or more titanium salts of (a); and/or
The magnesium salt solution corresponding to magnesium oxide is selected from MgSO4、MgCl2And Mg (NO)3)2A solution of one or more titanium salts of (a); and/or
The silicate or metasilicate solution corresponding to the silica is formed from Na2SiO3、K2SiO3And MgSiO3A solution of one or more salts of (a).
19. The method of claim 10, wherein the drying is at a temperature of 80-180 ℃ for 1-6 hours; and/or
Wherein the calcination is carried out at a temperature of 500 ℃ to 900 ℃ for 5 minutes to 30 minutes.
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