CN101885926A - Method for producing rutile type titanium white powder with high hiding power - Google Patents
Method for producing rutile type titanium white powder with high hiding power Download PDFInfo
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Abstract
The invention discloses a method for producing rutile type titanium white powder with high hiding power, which comprises the following steps of: preparing slurry containing a primary titanium dioxide product, diluting the slurry, adding a silicon-containing compound into the slurry, then adding the silicon-containing compound and an acid aluminum-containing compound into the mixture, and performing ageing, filtration, water washing, drying, crushing and the like. The adding order, adding mode, adding quantity and the like of each coating agent are controlled by fine processes, and process and parameter conditions of each operation step are strictly controlled at the same time so that the added coating agents are deposited on the surfaces of titanium white powder particles in forms of compact silicon dioxide coating layers, loose silicon dioxide coating layers and alumina coating layers; and the hiding power of a titanium white powder product is improved and the characteristics such as high whiteness and the like and basic weather resistance of the titanium white powder product are kept by combining the processes of ageing, filtration, water washing, drying, crushing and the like.
Description
Technical field
The present invention relates to the production technical field of titanium dioxide, especially a kind of method for producing rutile type titanium white powder with high hiding power.
Background technology
TiO 2 pigment is best white pigment, and it has advantages such as whiteness height, opacity height, physicochemical property be stable, is widely used in industries such as coating, plastics, papermaking.
In the application of paints field, the opacifying power of titanium dioxide is relevant with the difference of pigment and resin specific refractory power, and difference is big more, and opacifying power is high more.Because the specific refractory power of hydrated SiO 2 is minimum, in the surface treatment process of titanium dioxide, introduce hydrated SiO 2 and can increase this refractive index difference, coating a large amount of hydrated SiO 2s can also make single titanium dioxide particle isolate each other to greatest extent, be in good dispersion state, thereby significantly improve the utilization ratio of titanium dioxide.In addition because the specific refractory power of air is minimum in all substances, in building coating, because the volumetric concentration of pigment is higher in the prescription, the volumetric concentration of pigment greater than critical volume concentration after, resin in filming can not coat pigment particles fully, contain the part air thereby make in filming,, can significantly improve the opacifying power of filming the buildings matrix because the refraction difference of pigment and air is a maximum; If in the surface treatment of titanium dioxide, introduce the loose coating layer of one deck, can improve the air capacity in filming, reach the purpose that improves the titanium dioxide opacifying power.
With the technology that to improve its opacifying power in paint field be a kind of extensive employing, for example U.S. Pat 3437502, US3510335, US4075031 etc. on the surface of titanium dioxide for the hydrate that utilize to coat a large amount of silica-aluminas.
U.S. Pat 3437502 discloses a kind of production method of improved TiO 2 pigment, by coating the compact silicon dioxide of one deck based on titanium dioxide quality 0.5～25% on the TiO 2 particles surface, with the aluminum oxide of one deck based on titanium dioxide quality 0.1～10%, thereby obtain a kind of have high covering power and in water-borne coatings prescription the TiO 2 pigment of good dispersion, utilize the coating of the titanium white production of this method preparation to have excellent outdoor weatherability.
U.S. Pat 3510335 discloses and has a kind ofly coated about 1～25% porosity and looseness silicon dioxide film in titanium dioxide-aluminum oxide co-oxidation thing surface of pigments, calcines under 300～1000 ℃ of conditions then, obtains a kind of anti-discolouring and high covering power titanium dioxide.
U.S. Pat 4075031 discloses a kind of method that improves the TiO 2 pigment opacifying power, by coat the soft silica and the pellumina of one deck densification on the dioxide pigment surface, coat one deck porous silica-alumina film again, thereby when improving opacifying power, guaranteed the weathering resistance of titanium dioxide.
The contriver finds in secular experimental study and production practice, introduce the opacifying power that suitable silicon-dioxide and aluminum oxide can enough improve titanium dioxide really, but the silicon dioxide film refractive index that above-mentioned each patented method is produced under alkaline environment is higher, does not improve the opacifying power of titanium dioxide to greatest extent.And,, must not obtain good opacifying power effect if just simply silicon-dioxide and alumina type composition are added in the titanium dioxide slurry; The control of details such as the parameter condition in the addition sequence of each raw material composition, add-on and the production process, all remarkable influence is to the opacifying power of product titanium dioxide; Unsuitable addition sequence and add-on, perhaps unsuitable processing parameter condition does not all reach the ideal effect that improves opacifying power.
Summary of the invention
Main purpose of the present invention is at above-mentioned the deficiencies in the prior art, and a kind of new method for producing rutile type titanium white powder with high hiding power is provided; By rational control raw material add-on and addition sequence, simultaneously strict each processing condition of control reach the effect of effective raising titanium dioxide opacifying power.
In order to realize the foregoing invention purpose, the technical solution used in the present invention is as follows:
A kind of method for producing rutile type titanium white powder with high hiding power comprises the steps:
(1), preparation comprises the slurry of titanium dioxide first product: preparation concentration is 600～800gTiO
2The slurry of/L, and grind with depolymerization coarse particles wherein with sand mill makes titanium dioxide reach simple particle diameter (simple particle diameter is meant that size is 0.20～0.35 micron titanium dioxide crystalline size with pigment performance, down with);
The preparation method of slurry is that the technician is known in the industry, general dispersing auxiliary such as water glass or the trolamine etc. of in deionized water, adding earlier under agitation condition, slowly add quantitative titanium dioxide primary product again, according to the different characteristics of dispersion agent kind and titanium dioxide primary product, the concentration of slurry generally is controlled at 600～800gTiO
2In the scope of/L, higher so relatively concentration helps improving the efficient of sand milling depolymerization, and grinds with depolymerization coarse particles wherein with sand mill, and titanium dioxide is disperseed in slurry better, reaches simple particle diameter;
(2), dilution: can be coated equably by the coating agent in order to make the titanium dioxide particle surface in the scattered titanium dioxide slurry of sand milling, the concentration that adds deionized water adjusting slurry is 200～400gTiO
2/ L, and with steam heating to 30～40 ℃; More than the re-adjustment slurry pH value to 10.0;
(3), add silicon-containing compound: the solution that adds silicon-containing compound is in slurry, and wherein the strength of solution of silicon-containing compound is with SiO
2Meter 90～110g/L is advisable, and the add-on of silicon-containing compound is with SiO
2And TiO
2Mass ratio count 4%～6%(and can be preferably 4.5%～5.5%); With steam the temperature of slurry is raised to 50～90 ℃ again, regulates slurry pH value to 0.8～1.5(and can be preferably 1.0～1.2);
In this step, coating agent silicon-containing compound adds under alkaline condition, and hydrolysis under described alkaline condition, is deposited to the surface of titanium dioxide particle simultaneously, generates the layer of silicon dioxide coating layer; Because the hydrolytic process speed of silicon-containing compound is slower under this condition, so the coating layer that generates is comparatively fine and close; Transfer slurry pH value to acidic conditions with acidic cpd solution again, it mainly acts on is slaking (making the silicon-dioxide coating layer of generation obtain aging fully) and prepares for next step processing;
Silicon-containing compound in this step can be selected from least a in water glass, the potassium silicate etc., is preferred with the water glass;
(4), again add silicon-containing compound: the solution that adds the silicon-containing compound identical with step (3) is in slurry, and its add-on is with SiO
2And TiO
2Mass ratio count 4%～6%(and can be preferably 4.5～5.5%);
In this step, under described acidic conditions, hydrolysis takes place in initiate (alkalescence) silicon-containing compound immediately, and hydrolysis rate is exceedingly fast, be adsorbed to the silicon-dioxide coating layer surface of the densification that step (3) generated, the silicon-dioxide coating layer that regeneration one deck is loose; Utilize the air in the loose coating layer to hide principle, can greatly improve dispersiveness and the opacifying power of titanium dioxide in coating;
(5), add acid aluminum contained compound: the solution that adds acid aluminum contained compound is in slurry, and wherein the strength of solution of acid aluminum contained compound is with Al
2O
3Meter 90～110g/L is advisable, and the add-on of acid aluminum contained compound is with Al
2O
3And TiO
2Mass ratio count 4%～6%(and can be preferably 4.5%～5.5%); After the solution adding of acid aluminum contained compound finished, re-adjustment slurry pH value to 6.0～8.0(can be preferably 6.5～7.5);
After step (4) added silicon-containing compound, pH value of slurry was about 2.5～3.0, the not hydrolysis substantially with this understanding of the acid aluminum contained compound of coating agent; In the process of regulating joint slurry pH value to 6.0～8.0, acid aluminum contained compound generation hydrolysis, and be deposited to the loose silicon-dioxide coating layer surface that step (4) has generated, generate one deck aluminum oxide coating layer;
Optional at least a in Tai-Ace S 150, aluminum chloride, aluminum nitrate etc. of acid aluminum contained compound in this step is preferred with Tai-Ace S 150;
(6), slaking, filtration, washing, drying, pulverizing: through the slaking 40～100 minutes under insulation (temperature range of above-mentioned steps operation back, slurry is generally about 70 ℃) and stirring of titanium dioxide slurry that above-mentioned steps coats, washing after filtration,, (usually can be dry under 125～150 ℃ temperature in air dry oven with filtration cakes torrefaction, also can adopt other drying mode and drying temperature can), pulverize, obtain promptly that described to have with the high covering power be the titanium white powder pigment of feature.
In the research process of the inventive method, the contriver finds: introduce silicon-containing compound and acid aluminum contained compound by suitable mode (comprise addition, addition means and add sequential scheduling) in the coating process of sulfuric acid method titanium pigment, can improve the opacifying power of titanium dioxide significantly; But obviously be not that the order of addition and interpolation arbitrarily all can obtain the ideal effect, even even adopt same addition and interpolation order, but addition means difference, the shading performance of the titanium dioxide product that obtains etc. also has nothing in common with each other, even significant difference.
The contriver is in a large number, on the experimental basis repeatedly, constantly summing up experience, improve perfect, determined high covering power titanium white production method as described in the present invention, especially wherein each raw material packet film (silicon-containing compound, acid aluminum contained compound) addition manner, interpolation order and addition etc., by process design and control meticulous in the inventive method, in the Rutile type Titanium Dioxide last handling process, wrap up two-layer silicon-dioxide coating layer (comprising tight zone and tectorium) and one deck aluminum oxide coating layer at the titanium dioxide particle surface successively, under described certain conditions, make the coating agent silicon-containing compound of adding deposit to TiO with the structure formation hydrolysis of silicon dioxide compact coating layer and the loose coating layer of silicon-dioxide respectively
2On the surface of particle, the acid aluminum contained compound of coating agent then is deposited on the surface of the loose coating layer of silicon-dioxide with the structure formation hydrolysis of aluminum oxide coating layer, makes the titanium dioxide product again after slaking, filtration, washing, drying, pulverizing; Corresponding before and after the interpolation of each step and each raw material, support mutually, can significantly improve the opacifying power of titanium dioxide product, and when improving the opacifying power of titanium dioxide, also guaranteeing characteristics and basic weather resistance such as high whiteness, the titanium dioxide that adopts this method to produce especially is suitable for the titanium dioxide opacifying power is had the fields such as building coating of particular requirement.
Compared with prior art, the invention has the beneficial effects as follows:
The inventive method adopts suitable raw material packet film reasonable combination, and control the interpolation order of each coating agent by meticulous technological process, addition manner and addition etc., the technology and the parameter condition of strict simultaneously each operation steps of control, the coating agent that makes adding is respectively with the silicon dioxide compact coating layer, the silicon-dioxide coating layer that loosens, the form of aluminum oxide coating layer is deposited to the surface of titanium dioxide particle, again in conjunction with slaking, filter, washing, operations such as drying and pulverizing, corresponding before and after the interpolation of each step and each raw material, support mutually, can significantly improve the opacifying power of titanium dioxide product, and keeping characteristics and basic weather resistance such as its high whiteness, the titanium dioxide that this method is produced especially is suitable for the titanium dioxide opacifying power is had the fields such as building coating of particular requirement.
Embodiment
The present invention is described in further detail below in conjunction with embodiment.
But this should be interpreted as that the scope of the above-mentioned theme of the present invention only limits to following embodiment.Not breaking away under the above-mentioned technological thought situation of the present invention, according to ordinary skill knowledge and customary means, make various replacements and change, all should comprise within the scope of the invention.
Embodiment 1
The present embodiment method for producing rutile type titanium white powder with high hiding power comprises the steps:
(1), preparation comprises the slurry of titanium dioxide first product: take by weighing the 6000g deionized water, add and contain 12gSiO
2Sodium silicate solution, under agitation add 6000g not the Rutile type Titanium Dioxide of coating make concentration and be about 800gTiO
2The titanium dioxide slurry of/L is used laboratory sand mill sand milling again, makes titanium dioxide reach simple particle diameter;
(2), dilution: the concentration that adds deionized water adjusting slurry is 300gTiO
2/ L is transferred in the coating groove, with the mode of steam indirect heating slurry is heated to 35 ℃; Re-adjustment slurry pH value is to about 10.0;
(3), add silicon-containing compound: add 100gSiO
2The sodium silicate solution 3000mL(of/L presses SiO
2With TiO
2The mass percent meter be about 5.0%); Mode with the steam indirect heating is heated to 70 ℃ to slurry, is that 15% dilution heat of sulfuric acid is adjusted to 1.0 to pH value of slurry with mass percent concentration again;
(4), add silicon-containing compound again: add 100gSiO again
2The sodium silicate solution 3000mL(of/L presses SiO
2With TiO
2The mass percent meter be about 5.0%);
(5), add acid aluminum contained compound: adding concentration is 100gAl
2O
3The alum liquor 3000mL(of/L presses Al
2O
3And TiO
2The mass ratio meter be about 5.0%); Use dilute alkaline soln (mass percent concentration is 25% NaOH solution) to regulate slurry pH value to 7.0 again;
(6), slaking, filtration, washing, drying, pulverizing: through the slaking 40 minutes in insulation and under stirring of titanium dioxide slurry that above-mentioned steps coats, after filtration, washing,, pulverize, promptly obtain described titanium dioxide finished product with the steam flow pulverizer with filtration cakes torrefaction.
Embodiment 2
The present embodiment method for producing rutile type titanium white powder with high hiding power comprises the steps:
(1), preparation comprises the slurry of titanium dioxide first product: take by weighing the 6000g deionized water, add and contain 12gSiO
2Sodium silicate solution, under agitation add 6000g not the Rutile type Titanium Dioxide of coating make concentration and be about 800gTiO
2The titanium dioxide slurry of/L is used laboratory sand mill sand milling again, makes titanium dioxide reach simple particle diameter;
(2), dilution: the concentration that adds deionized water adjusting slurry is 300gTiO
2/ L is transferred in the coating groove, with the mode of steam indirect heating slurry is heated to 35 ℃; Re-adjustment slurry pH value is to about 10.0;
(3), add silicon-containing compound: add 100gSiO
2The sodium silicate solution 2700mL(of/L presses SiO
2With TiO
2The mass percent meter be about 4.5%); Mode with the steam indirect heating is heated to 60 ℃ to slurry, is that 15% dilution heat of sulfuric acid is adjusted to 1.2 to pH value of slurry with mass percent concentration again;
(4), add silicon-containing compound again: add 100gSiO again
2The sodium silicate solution 2700mL(of/L presses SiO
2With TiO
2The mass percent meter be about 4.5%);
(5), add acid aluminum contained compound: adding concentration is 100gAl
2O
3The alum liquor 2700mL(of/L presses Al
2O
3And TiO
2The mass ratio meter be about 4.5%); Use dilute alkaline soln (mass percent concentration is 25% NaOH solution) to regulate slurry pH value to 6.5 again;
(6), slaking, filtration, washing, drying, pulverizing: through the slaking 60 minutes in insulation and under stirring of titanium dioxide slurry that above-mentioned steps coats, after filtration, washing,, pulverize, promptly obtain described titanium dioxide finished product with the steam flow pulverizer with filtration cakes torrefaction.
Embodiment 3
The present embodiment method for producing rutile type titanium white powder with high hiding power comprises the steps:
(1), preparation comprises the slurry of titanium dioxide first product: take by weighing the 8500g deionized water, add and contain 12gSiO
2Sodium silicate solution, under agitation add 6000g not the Rutile type Titanium Dioxide of coating make concentration and be about 600gTiO
2The titanium dioxide slurry of/L is used laboratory sand mill sand milling again, makes titanium dioxide reach simple particle diameter;
(2), dilution: the concentration that adds deionized water adjusting slurry is 200gTiO
2/ L is transferred in the coating groove, with the mode of steam indirect heating slurry is heated to 40 ℃; Re-adjustment slurry pH value is to about 11.0;
(3), add silicon-containing compound: add 100gSiO
2The sodium silicate solution 2400mL(of/L presses SiO
2With TiO
2The mass percent meter be about 4.0%); Mode with the steam indirect heating is heated to 80 ℃ to slurry, is that 15% dilution heat of sulfuric acid is adjusted to 0.8 to pH value of slurry with mass percent concentration again;
(4), add silicon-containing compound again: add 100gSiO again
2The sodium silicate solution 2400mL(of/L presses SiO
2With TiO
2The mass percent meter be about 4.0%);
(5), add acid aluminum contained compound: adding concentration is 100gAl
2O
3The alum liquor 3600mL(of/L presses Al
2O
3And TiO
2The mass ratio meter be about 6.0%); Use dilute alkaline soln (mass percent concentration is 25% NaOH solution) to regulate slurry pH value to 8.0 again;
(6), slaking, filtration, washing, drying, pulverizing: through the slaking 80 minutes in insulation and under stirring of titanium dioxide slurry that above-mentioned steps coats, after filtration, washing,, pulverize, promptly obtain described titanium dioxide finished product with the steam flow pulverizer with filtration cakes torrefaction.
Embodiment 4
The present embodiment method for producing rutile type titanium white powder with high hiding power comprises the steps:
(1), preparation comprises the slurry of titanium dioxide first product: take by weighing the 7070g deionized water, add and contain 12gSiO
2Sodium silicate solution, under agitation add 6000g not the Rutile type Titanium Dioxide of coating make concentration and be about 700gTiO
2The titanium dioxide slurry of/L is used laboratory sand mill sand milling again, makes titanium dioxide reach simple particle diameter;
(2), dilution: the concentration that adds deionized water adjusting slurry is 400gTiO
2/ L is transferred in the coating groove, with the mode of steam indirect heating slurry is heated to 30 ℃; Re-adjustment slurry pH value is to about 12.0;
(3), add silicon-containing compound: add 100gSiO
2The sodium silicate solution 3600mL(of/L presses SiO
2With TiO
2The mass percent meter be about 6.0%); Mode with the steam indirect heating is heated to 50 ℃ to slurry, is that 15% dilution heat of sulfuric acid is adjusted to 1.5 to pH value of slurry with mass percent concentration again;
(4), add silicon-containing compound again: add 100gSiO again
2The sodium silicate solution 3300mL(of/L presses SiO
2With TiO
2The mass percent meter be about 5.5%);
(5), add acid aluminum contained compound: adding concentration is 100gAl
2O
3The alum liquor 2400mL(of/L presses Al
2O
3And TiO
2The mass ratio meter be about 4.0%); Use dilute alkaline soln (mass percent concentration is 25% NaOH solution) to regulate slurry pH value to 7.5 again;
(6), slaking, filtration, washing, drying, pulverizing: through the slaking 90 minutes in insulation and under stirring of titanium dioxide slurry that above-mentioned steps coats, after filtration, washing,, pulverize, promptly obtain described titanium dioxide finished product with the steam flow pulverizer with filtration cakes torrefaction.
Embodiment 5
The present embodiment method for producing rutile type titanium white powder with high hiding power comprises the steps:
(1), preparation comprises the slurry of titanium dioxide first product: take by weighing the 8500g deionized water, add and contain 12gSiO
2Sodium silicate solution, under agitation add 6000g not the Rutile type Titanium Dioxide of coating make concentration and be about 600gTiO
2The titanium dioxide slurry of/L is used laboratory sand mill sand milling again, makes titanium dioxide reach simple particle diameter;
(2), dilution: the concentration that adds deionized water adjusting slurry is 300gTiO
2/ L is transferred in the coating groove, with the mode of steam indirect heating slurry is heated to 40 ℃; Re-adjustment slurry pH value is to about 10.5;
(3), add silicon-containing compound: add 100gSiO
2The sodium silicate solution 3300mL(of/L presses SiO
2With TiO
2The mass percent meter be about 5.5%); Mode with the steam indirect heating is heated to 90 ℃ to slurry, is that 15% dilution heat of sulfuric acid is adjusted to 1.0 to pH value of slurry with mass percent concentration again;
(4), add silicon-containing compound again: add 100gSiO again
2The sodium silicate solution 3600mL(of/L presses SiO
2With TiO
2The mass percent meter be about 6.0%);
(5), add acid aluminum contained compound: adding concentration is 100gAl
2O
3The alum liquor 3300mL(of/L presses Al
2O
3And TiO
2The mass ratio meter be about 5.5%); Use dilute alkaline soln (mass percent concentration is 25% NaOH solution) to regulate slurry pH value to 6.0 again;
(6), slaking, filtration, washing, drying, pulverizing: through the slaking 100 minutes in insulation and under stirring of titanium dioxide slurry that above-mentioned steps coats, after filtration, washing,, pulverize, promptly obtain described titanium dioxide finished product with the steam flow pulverizer with filtration cakes torrefaction.
The various embodiments described above gained titanium dioxide finished product and Comparative Examples (the applicant produces and sell universal titanium dioxide R-996 for many years, has commercially available) are mixed with acrylic emulsion coatings by following prescription and method:
Water 100g,
Dispersion agent 5040 3g,
Wetting agent PE-100 0.5g,
Defoamer 309A 1g,
Sanitas LFM 1g,
Titanium dioxide 75g,
CaCO3 105g，
Talcum powder 50g,
Propylene glycol 15g,
Above material 1500rpm mixed 10 minutes, got 80% of slurry and added;
Emulsion 70g,
2.5% Natvosol 20g,
50%RM-2020 flow agent 2.4g.
The latex coating for preparing being prepared into the preparing device of filming filming, utilize the whiteness instrument to measure the whiteness of filming, measure the opacifying power of filming with visual method again, is 100 with the opacifying power of Comparative Examples; And tan by the sun field recognition coating weatherability (measurement result is as shown in following table) naturally in Hainan.Wherein whiteness index is the film index of whiteness of expression, and the big more expression of value is filmed white more; Opacifying power is to film to hide the ability of ground color, and the ability of the high more covering background color of value is high more, uses just economical more.Weathering resistance is meant that coating resists the various weather condition destructive abilities such as ultraviolet ray in temperature, humidity, the sunlight under the nature condition.
| The sample title | Whiteness index | Opacifying power | Weathering resistance |
| Comparative Examples | 82.6 | 100 | Suitable with Comparative Examples |
| Embodiment 1 | 84.8 | 125 | Suitable with Comparative Examples |
| Embodiment 2 | 85.1 | 120 | Suitable with Comparative Examples |
| Embodiment 3 | 84.9 | 121 | Suitable with Comparative Examples |
| Embodiment 4 | 84.5 | 128 | Suitable with Comparative Examples |
| Embodiment 5 | 84.4 | 127 | Suitable with Comparative Examples |
From above each routine applied performance analysis, in the Application Areas-high covering power latex coating of titanium dioxide of the present invention, the titanium dioxide that the inventive method is produced is compared with the titanium dioxide of produced in conventional processes, shown remarkable opacifying power and whiteness performance, guaranteed the weathering resistance equal simultaneously with traditional method.
Claims (10)
1. method for producing rutile type titanium white powder with high hiding power comprises following key step:
(1), preparation comprises the slurry of titanium dioxide first product: preparation concentration is 600～800gTiO
2The slurry of/L, and grind with depolymerization coarse particles wherein with sand mill, make titanium dioxide reach simple particle diameter;
(2), dilution: the concentration that adds deionized water adjusting slurry is 200～400gTiO
2/ L, and with steam heating to 30～40 ℃; More than the re-adjustment slurry pH value to 10.0;
(3), add silicon-containing compound: the solution that adds silicon-containing compound is in slurry, and wherein the strength of solution of silicon-containing compound is with SiO
2Count 90～110g/L, the add-on of silicon-containing compound is with SiO
2And TiO
2Mass ratio be 4%～6%; With steam the temperature of slurry is raised to 50～90 ℃ again, regulates slurry pH value to 0.8～1.5;
(4), again add silicon-containing compound: the solution that adds the silicon-containing compound identical with step (3) is in slurry, and its add-on is with SiO
2And TiO
2Mass ratio be 4%～6%;
(5), add acid aluminum contained compound: the solution that adds acid aluminum contained compound is in slurry, and wherein the strength of solution of acid aluminum contained compound is with Al
2O
3Count 90～110g/L, the add-on of acid aluminum contained compound is with Al
2O
3And TiO
2Mass ratio be 4%～6%; After the solution adding of acid aluminum contained compound finishes, re-adjustment slurry pH value to 6.0～8.0;
(6), slaking, filtration, washing, drying, pulverizing: through the slaking 40～100 minutes in insulation and under stirring of titanium dioxide slurry that above-mentioned steps coats, after filtration, washing,, pulverize, promptly obtain described titanium dioxide with filtration cakes torrefaction.
2. method according to claim 1 is characterized in that:
In described step (3) and the step (4), silicon-containing compound is selected from least a in water glass, the potassium silicate.
3. method according to claim 2 is characterized in that:
In described step (3) and the step (4), silicon-containing compound is a water glass.
4. method according to claim 1 is characterized in that:
In the described step (3), the add-on of silicon-containing compound is with SiO
2And TiO
2Mass ratio be 4.5%～5.5%.
5. method according to claim 1 is characterized in that:
In the described step (3), the temperature of slurry is raised to 50～90 ℃ after, regulate slurry pH value to 1.0～1.2.
6. method according to claim 1 is characterized in that:
In the described step (4), the add-on of silicon-containing compound is with SiO
2And TiO
2Mass ratio be 4.5%～5.5%.
7. method according to claim 1 is characterized in that:
In the described step (5), acid aluminum contained compound is selected from least a in Tai-Ace S 150, aluminum chloride, the aluminum nitrate.
8. method according to claim 7 is characterized in that:
In the described step (5), acid aluminum contained compound is a Tai-Ace S 150.
9. method according to claim 1 is characterized in that:
In the described step (5), the add-on of acid aluminum contained compound is with Al
2O
3And TiO
2Mass ratio be 4.5%～5.5%.
10. method according to claim 1 is characterized in that:
In the described step (5), after the adding of the solution of acid aluminum contained compound finishes, re-adjustment slurry pH value to 6.5～7.5.
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