CN114573021A - High-purity mixed crystal titanium dioxide and production method thereof - Google Patents
High-purity mixed crystal titanium dioxide and production method thereof Download PDFInfo
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- CN114573021A CN114573021A CN202210244349.4A CN202210244349A CN114573021A CN 114573021 A CN114573021 A CN 114573021A CN 202210244349 A CN202210244349 A CN 202210244349A CN 114573021 A CN114573021 A CN 114573021A
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 203
- 239000004408 titanium dioxide Substances 0.000 title claims abstract description 88
- 239000013078 crystal Substances 0.000 title claims abstract description 36
- 238000004519 manufacturing process Methods 0.000 title claims description 16
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000007788 liquid Substances 0.000 claims abstract description 37
- 239000010936 titanium Substances 0.000 claims abstract description 37
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 37
- 239000012535 impurity Substances 0.000 claims abstract description 28
- 239000002994 raw material Substances 0.000 claims abstract description 28
- YDZQQRWRVYGNER-UHFFFAOYSA-N iron;titanium;trihydrate Chemical compound O.O.O.[Ti].[Fe] YDZQQRWRVYGNER-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000000126 substance Substances 0.000 claims abstract description 24
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 17
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 17
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000001354 calcination Methods 0.000 claims abstract description 16
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 8
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000002360 preparation method Methods 0.000 claims abstract description 6
- 239000002253 acid Substances 0.000 claims description 40
- 239000007787 solid Substances 0.000 claims description 20
- 238000005406 washing Methods 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 15
- 150000003839 salts Chemical class 0.000 claims description 15
- 238000004062 sedimentation Methods 0.000 claims description 15
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 239000000084 colloidal system Substances 0.000 claims description 10
- 230000005484 gravity Effects 0.000 claims description 10
- 230000003301 hydrolyzing effect Effects 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 10
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 9
- 239000011574 phosphorus Substances 0.000 claims description 9
- 229910052698 phosphorus Inorganic materials 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 230000007062 hydrolysis Effects 0.000 claims description 6
- 238000006460 hydrolysis reaction Methods 0.000 claims description 6
- 239000003513 alkali Substances 0.000 claims description 5
- 239000003610 charcoal Substances 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 5
- 238000007885 magnetic separation Methods 0.000 claims description 5
- 239000006148 magnetic separator Substances 0.000 claims description 5
- 239000011707 mineral Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 238000006386 neutralization reaction Methods 0.000 claims description 5
- 229920002401 polyacrylamide Polymers 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 230000001376 precipitating effect Effects 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 238000004537 pulping Methods 0.000 claims description 5
- 238000003860 storage Methods 0.000 claims description 5
- 239000002699 waste material Substances 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims 4
- 239000004411 aluminium Substances 0.000 abstract 1
- 235000010215 titanium dioxide Nutrition 0.000 description 58
- 239000000463 material Substances 0.000 description 3
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000001023 inorganic pigment Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G23/00—Compounds of titanium
- C01G23/04—Oxides; Hydroxides
- C01G23/047—Titanium dioxide
- C01G23/053—Producing by wet processes, e.g. hydrolysing titanium salts
- C01G23/0532—Producing by wet processes, e.g. hydrolysing titanium salts by hydrolysing sulfate-containing salts
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
The invention belongs to the technical field of chemical industry, and particularly relates to high-purity mixed crystal titanium dioxide which is prepared from the following raw materials: titanium dioxide, rutile type titanium dioxide, anatase type titanium dioxide, trivalent aluminium, the phosphoric acid content of the above-mentioned titanium dioxide is 0.01-0.05% of the total weight of titanium dioxide at the same time, its preparation method includes a plurality of steps such as preconditioning, acidolysis, impurity removal, aquolysis, calcining, etc., the invention carries on the preconditioning to ilmenite before acidolysis, carry on the impurity removal treatment to the titanium liquid after the completion of acidolysis at the same time, remove the trace heavy metal impurity in the course of aquolysis synchronously, the processing technology is simple and the treatment cost is lower, can process its impurity better, have guaranteed the hue and quality of titanium dioxide, avoid producing the influence on whiteness degree of titanium dioxide, have improved the purity of titanium dioxide.
Description
Technical Field
The invention relates to the technical field of chemical industry, in particular to high-purity mixed crystal titanium dioxide and a production method thereof.
Background
Titanium dioxide is one of the most important inorganic pigments and chemical raw materials, is used as an opaque pigment and is widely applied to the industries of coatings, papermaking, plastics, rubber, emulsion paint, printing ink, chemical fibers and the like; as a chemical raw material product, the ceramic is mainly applied to the fields of enamel, capacitors, metallurgy, welding electrodes and the like. At present, the method for producing titanium dioxide mainly comprises a sulfuric acid method and a chlorination method, and the existing titanium dioxide is often neglected due to the constraints of production cost and production process in the production process, so that the hue of the produced titanium dioxide is affected, the titanium dioxide cannot meet the use requirement under the serious condition, and the quality of the titanium dioxide is greatly affected.
Disclosure of Invention
The invention aims to provide high-purity mixed-crystal titanium dioxide and a production method thereof, and aims to solve the problems that the hue of the titanium dioxide proposed in the background art is influenced, the titanium dioxide cannot meet the use requirement under the serious condition, and the quality of the titanium dioxide is greatly influenced.
In order to achieve the purpose, the invention provides the following technical scheme: a high-purity mixed crystal titanium dioxide is composed of the following raw materials in percentage by weight: 95-97% of titanium dioxide, 30-70% of rutile titanium dioxide, 20-65% of anatase titanium dioxide and 1-3% of trivalent aluminum, and the phosphoric acid content of the titanium dioxide is 0.01-0.05% of the total weight of the titanium dioxide.
Preferably, the material comprises the following raw materials in percentage by weight: 95 percent of titanium dioxide, 30 percent of rutile titanium dioxide, 20 percent of anatase titanium dioxide and 1 percent of trivalent aluminum, and the phosphorus content of the titanium dioxide is 0.02 percent of the total weight of the titanium dioxide.
Preferably, the material comprises the following raw materials in percentage by weight: 96% of titanium dioxide, 50% of rutile titanium dioxide, 45% of anatase titanium dioxide and 2% of trivalent aluminum, wherein the phosphorus content of the titanium dioxide is 0.03% of the total weight of the titanium dioxide.
Preferably, the material comprises the following raw materials in percentage by weight: 97 percent of titanium dioxide, 70 percent of rutile titanium dioxide, 65 percent of anatase titanium dioxide and 3 percent of trivalent aluminum, wherein the phosphorus content of the titanium dioxide is 0.05 percent of the total weight of the titanium dioxide.
A method for producing high-purity mixed crystal titanium dioxide comprises the following steps:
step 1: pretreating, namely putting ilmenite into a shaking table, removing most gangue in the ilmenite by gravity, and carrying out magnetic separation by a magnetic separator to remove impurities from the minerals by a magnetic field;
step 2: acidolysis, namely grinding and drying ilmenite pretreated in the step 1, then putting the ilmenite into an acidolysis tank, carrying out acidolysis reaction with concentrated sulfuric acid, cooling acidolysis solution, solid inert substances and unreacted raw material residue solution, completely discharging the cooled acidolysis solution, the solid inert substances and the unreacted raw material residue solution from the bottom of the acidolysis tank into a sedimentation tank, decomposing and precipitating the liquid in the sedimentation tank through gravity, washing the solid substances in the sedimentation tank by using waste acid to recover unreacted raw materials after the solid substances are removed, then washing the residual solution by using water, and finely filtering the settled titanium solution to remove fine residual particles;
and step 3: removing impurities, namely putting the modified polyacrylamide colloid with negative charges into titanium liquid for electrical neutralization to enable colloid particles to be condensed and settled to remove the impurities, and then performing filter pressing by using a plate-and-frame filter press with charcoal powder as a filter aid layer;
and 4, step 4: hydrolyzing, namely heating and mixing the titanium liquid treated in the step 3 and alkali liquor in a seed crystal preparation tank to prepare seed crystals, adding the seed crystals into a titanium liquid preheating tank for stirring, putting the titanium liquid in the titanium liquid preheating tank into a hydrolysis pot for hydrolyzing, putting the hydrolyzed titanium liquid into a metatitanic acid storage tank for first washing, after the first washing, pulping the metatitanic acid, entering a bleaching program, rinsing the bleached metatitanic acid, adding trivalent aluminum into the metatitanic acid to remove trace heavy metal impurities, finally performing salt treatment on the metatitanic acid, and adding phosphoric acid during the salt treatment;
and 5: and (4) calcining, namely performing pre-kiln squeezing on the metatitanic acid after salt treatment in the step (4), transferring squeezed water and titanium dioxide into a kiln body, performing calcining, cooling in a cooling kiln after calcining, and crushing in a Raymond mill to obtain the finished product titanium dioxide.
Preferably, during the acidolysis in the step 2, air compression is firstly carried out, then ilmenite and sulfuric acid are stirred for 30min, steam is added to initiate a main reaction for 1h, and after the reaction is finished, air compression is continuously carried out for 10-15 min.
Preferably, the water and titanium dioxide are calcined at 1250 ℃ in step 5.
Preferably, the pH value of the bleached metatitanic acid in the step 4 is 2-3.
Compared with the prior art, the invention has the beneficial effects that:
the method pretreats ilmenite before acidolysis, simultaneously removes impurities from titanium liquid after acidolysis is finished, synchronously removes trace heavy metal impurities in the hydrolysis process, has simple treatment process and lower treatment cost, can better treat the impurities, ensures the hue and quality of titanium white, avoids influencing the whiteness of the titanium white, and improves the purity of the titanium white.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations and positional relationships only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
The invention provides a technical scheme that:
example 1:
the high-purity mixed crystal titanium dioxide consists of the following raw materials in percentage by weight: 95 percent of titanium dioxide, 30 percent of rutile titanium dioxide, 20 percent of anatase titanium dioxide and 1 percent of trivalent aluminum, and the phosphorus content of the titanium dioxide is 0.02 percent of the total weight of the titanium dioxide.
The method for producing the high-purity mixed crystal titanium dioxide comprises the following steps:
step 1: pretreating, namely putting ilmenite into a shaking table, removing most gangue in the ilmenite by gravity, and carrying out magnetic separation by a magnetic separator to remove impurities from the minerals by a magnetic field;
step 2: acidolysis, namely grinding and drying ilmenite pretreated in the step 1, then putting the ilmenite into an acidolysis tank, carrying out acidolysis reaction with concentrated sulfuric acid, cooling acidolysis solution, solid inert substances and unreacted raw material residue solution, completely discharging the cooled acidolysis solution, the solid inert substances and the unreacted raw material residue solution from the bottom of the acidolysis tank into a sedimentation tank, decomposing and precipitating the liquid in the sedimentation tank through gravity, washing the solid substances in the sedimentation tank by using waste acid to recover unreacted raw materials after the solid substances are removed, then washing the residual solution by using water, and finely filtering the settled titanium solution to remove fine residual particles;
and step 3: removing impurities, namely putting the modified polyacrylamide colloid with negative charges into titanium liquid for electrical neutralization to enable colloid particles to be condensed and settled to remove the impurities, and then performing filter pressing by using a plate-and-frame filter press with charcoal powder as a filter aid layer;
and 4, step 4: hydrolyzing, namely heating and mixing the titanium liquid treated in the step 3 and alkali liquor in a seed crystal preparation tank to prepare seed crystals, adding the seed crystals into a titanium liquid preheating tank for stirring, putting the titanium liquid in the titanium liquid preheating tank into a hydrolysis pot for hydrolyzing, putting the hydrolyzed titanium liquid into a metatitanic acid storage tank for first washing, after the first washing, pulping the metatitanic acid, entering a bleaching program, rinsing the bleached metatitanic acid, wherein the pH value of the metatitanic acid is 2, adding trivalent aluminum into the metatitanic acid to remove trace heavy metal impurities, finally performing salt treatment on the metatitanic acid, and adding phosphoric acid during the salt treatment;
and 5: and (4) calcining, namely performing pre-kiln squeezing on the metatitanic acid after salt treatment in the step (4), transferring the squeezed water and titanium dioxide into a kiln body, performing calcining at 1000 ℃, cooling in a cooling kiln after calcining, and crushing in a Raymond mill to obtain the finished product titanium dioxide.
Example 2:
the high-purity mixed crystal titanium dioxide consists of the following raw materials in percentage by weight: 96% of titanium dioxide, 50% of rutile titanium dioxide, 45% of anatase titanium dioxide and 2% of trivalent aluminum, wherein the phosphorus content of the titanium dioxide is 0.03% of the total weight of the titanium dioxide.
The method for producing the high-purity mixed crystal titanium dioxide comprises the following steps:
step 1: pretreating, namely putting ilmenite into a shaking table, removing most gangue in the ilmenite by gravity, and carrying out magnetic separation by a magnetic separator to remove impurities from the minerals by a magnetic field;
step 2: acidolysis, namely grinding and drying ilmenite pretreated in the step 1, then putting the ilmenite into an acidolysis tank, carrying out acidolysis reaction with concentrated sulfuric acid, cooling acidolysis solution, solid inert substances and unreacted raw material residue solution, completely discharging the cooled acidolysis solution, the solid inert substances and the unreacted raw material residue solution from the bottom of the acidolysis tank into a sedimentation tank, decomposing and precipitating the liquid in the sedimentation tank through gravity, washing the solid substances in the sedimentation tank by using waste acid to recover unreacted raw materials after the solid substances are removed, then washing the residual solution by using water, and finely filtering the settled titanium solution to remove fine residual particles;
and step 3: removing impurities, namely putting the modified polyacrylamide colloid with negative charges into titanium liquid for electrical neutralization to enable colloid particles to be condensed and settled to remove the impurities, and then performing filter pressing by using a plate-and-frame filter press with charcoal powder as a filter aid layer;
and 4, step 4: hydrolyzing, namely heating and mixing the titanium liquid treated in the step 3 and alkali liquor in a seed crystal preparation tank to prepare seed crystals, adding the seed crystals into a titanium liquid preheating tank for stirring, putting the titanium liquid in the titanium liquid preheating tank into a hydrolysis pot for hydrolyzing, putting the hydrolyzed titanium liquid into a metatitanic acid storage tank for first washing, after the first washing, pulping the metatitanic acid, entering a bleaching program, rinsing the bleached metatitanic acid, wherein the pH value of the metatitanic acid is 3, adding trivalent aluminum into the metatitanic acid to remove trace heavy metal impurities, finally performing salt treatment on the metatitanic acid, and adding phosphoric acid during the salt treatment;
and 5: and (4) calcining, namely performing pre-kiln squeezing on the metatitanic acid after salt treatment in the step (4), transferring the squeezed water and titanium dioxide into a kiln body, performing calcining at 1150 ℃, cooling in a cooling kiln after calcining, and crushing in a Raymond mill to obtain the finished product titanium dioxide.
Example 3:
the high-purity mixed crystal titanium dioxide consists of the following raw materials in percentage by weight: 97 percent of titanium dioxide, 70 percent of rutile titanium dioxide, 65 percent of anatase titanium dioxide and 3 percent of trivalent aluminum, wherein the phosphorus content of the titanium dioxide is 0.05 percent of the total weight of the titanium dioxide.
The method for producing the high-purity mixed crystal titanium dioxide comprises the following steps:
step 1: pretreating, namely putting ilmenite into a shaking table, removing most gangue in the ilmenite by gravity, and carrying out magnetic separation by a magnetic separator to remove impurities from the minerals by a magnetic field;
step 2: acidolysis, namely grinding and drying ilmenite pretreated in the step 1, then putting the ilmenite into an acidolysis tank, carrying out acidolysis reaction with concentrated sulfuric acid, cooling acidolysis solution, solid inert substances and unreacted raw material residue solution, completely discharging the cooled acidolysis solution, the solid inert substances and the unreacted raw material residue solution from the bottom of the acidolysis tank into a sedimentation tank, decomposing and precipitating the liquid in the sedimentation tank through gravity, washing the solid substances in the sedimentation tank by using waste acid to recover unreacted raw materials after the solid substances are removed, then washing the residual solution by using water, and finely filtering the settled titanium solution to remove fine residual particles;
and step 3: removing impurities, namely putting the modified polyacrylamide colloid with negative charges into titanium liquid for electrical neutralization, condensing and settling colloid particles to remove the impurities, and performing filter pressing by using a plate-and-frame filter press with charcoal powder as a filter aid layer;
and 4, step 4: hydrolyzing, namely heating and mixing the titanium liquid treated in the step 3 and alkali liquor in a seed crystal preparation tank to prepare seed crystals, adding the seed crystals into a titanium liquid preheating tank for stirring, putting the titanium liquid in the titanium liquid preheating tank into a hydrolysis pot for hydrolyzing, putting the hydrolyzed titanium liquid into a metatitanic acid storage tank for first washing, after the first washing, pulping the metatitanic acid, entering a bleaching program, rinsing the bleached metatitanic acid, wherein the pH value of the metatitanic acid is 3, adding trivalent aluminum into the metatitanic acid to remove trace heavy metal impurities, finally performing salt treatment on the metatitanic acid, and adding phosphoric acid during the salt treatment;
and 5: and (4) calcining, namely beginning kiln-front squeezing of the metatitanic acid after the salt treatment in the step (4), transferring the squeezed water and the titanium dioxide into a kiln body, beginning calcining at 1250 ℃, cooling in a cooling kiln after the calcining, and crushing in a Raymond mill to obtain the finished titanium dioxide.
And 2, performing air compression during acidolysis in the step 2, stirring the ilmenite and the sulfuric acid for 30min, adding steam to initiate a main reaction for 1h, and continuing to perform air compression for 10-15min after the reaction is finished.
The above table shows the detection results obtained by detecting the titanium dioxide prepared in the embodiments 1 to 3 of the present invention, and the data shown in the above table can be used to better treat the impurities of the titanium dioxide, ensure the hue and quality of the titanium dioxide, avoid the influence on the whiteness of the titanium dioxide, and improve the purity of the titanium dioxide.
While there have been shown and described the fundamental principles and essential features of the invention and advantages thereof, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A high-purity mixed crystal titanium dioxide is characterized in that: the composite material consists of the following raw materials in percentage by weight: 95-97% of titanium dioxide, 30-70% of rutile titanium dioxide, 20-65% of anatase titanium dioxide and 1-3% of trivalent aluminum, and the phosphoric acid content of the titanium dioxide is 0.01-0.05% of the total weight of the titanium dioxide.
2. The high-purity mixed crystal titanium dioxide according to claim 1, which is characterized in that: the composite material consists of the following raw materials in percentage by weight: 95% of titanium dioxide, 30% of rutile titanium dioxide, 20% of anatase titanium dioxide and 1% of trivalent aluminum, wherein the phosphorus content of the titanium dioxide is 0.02% of the total weight of the titanium dioxide.
3. The high-purity mixed crystal titanium dioxide according to claim 1, which is characterized in that: the composite material consists of the following raw materials in percentage by weight: 96% of titanium dioxide, 50% of rutile titanium dioxide, 45% of anatase titanium dioxide and 2% of trivalent aluminum, wherein the phosphorus content of the titanium dioxide is 0.03% of the total weight of the titanium dioxide.
4. The high-purity mixed crystal titanium dioxide according to claim 1, which is characterized in that: the composite material consists of the following raw materials in percentage by weight: 97% of titanium dioxide, 70% of rutile titanium dioxide, 65% of anatase titanium dioxide and 3% of trivalent aluminum, wherein the phosphorus content of the titanium dioxide is 0.05% of the total weight of the titanium dioxide.
5. A method for producing the high-purity mixed crystal titanium dioxide according to any one of claims 1 to 4, which is characterized in that: the method comprises the following steps:
step 1: pretreating, namely putting ilmenite into a shaking table, removing most gangue in the ilmenite by gravity, and carrying out magnetic separation by a magnetic separator to remove impurities from the minerals by a magnetic field;
step 2: acidolysis, namely grinding and drying ilmenite pretreated in the step 1, then putting the ilmenite into an acidolysis tank, carrying out acidolysis reaction with concentrated sulfuric acid, cooling acidolysis solution, solid inert substances and unreacted raw material residue solution, completely discharging the cooled acidolysis solution, the solid inert substances and the unreacted raw material residue solution from the bottom of the acidolysis tank into a sedimentation tank, decomposing and precipitating the liquid in the sedimentation tank through gravity, washing the solid substances in the sedimentation tank by using waste acid to recover unreacted raw materials after the solid substances are removed, then washing the residual solution by using water, and finely filtering the settled titanium solution to remove fine residual particles;
and step 3: removing impurities, namely putting the modified polyacrylamide colloid with negative charges into titanium liquid for electrical neutralization, condensing and settling colloid particles to remove the impurities, and performing filter pressing by using a plate-and-frame filter press with charcoal powder as a filter aid layer;
and 4, step 4: hydrolyzing, namely heating and mixing the titanium liquid treated in the step 3 and alkali liquor in a seed crystal preparation tank to prepare seed crystals, adding the seed crystals into a titanium liquid preheating tank for stirring, putting the titanium liquid in the titanium liquid preheating tank into a hydrolysis pot for hydrolyzing, putting the hydrolyzed titanium liquid into a metatitanic acid storage tank for first washing, after the first washing, pulping the metatitanic acid, entering a bleaching program, rinsing the bleached metatitanic acid, adding trivalent aluminum into the metatitanic acid to remove trace heavy metal impurities, finally performing salt treatment on the metatitanic acid, and adding phosphoric acid during the salt treatment;
and 5: and (5) calcining, namely starting kiln-front squeezing of the metatitanic acid after the salt treatment in the step (4), transferring the squeezed water and the titanium dioxide into a kiln body, starting calcining, cooling in a cooling kiln after the calcining, and crushing in a Raymond mill to obtain the finished titanium dioxide.
6. The production method of the high-purity mixed-crystal titanium dioxide according to claim 5, which is characterized by comprising the following steps of: and 2, performing air compression during acidolysis in the step 2, stirring the ilmenite and the sulfuric acid for 30min, adding steam to initiate a main reaction for 1h, and continuing to perform air compression for 10-15min after the reaction is finished.
7. The production method of the high-purity mixed-crystal titanium dioxide according to claim 5, which is characterized by comprising the following steps of: the water and the titanium dioxide are calcined at 900-1250 ℃ in the step 5.
8. The production method of the high-purity mixed-crystal titanium dioxide according to claim 5, which is characterized by comprising the following steps of: the pH value of the bleached metatitanic acid in the step 4 is 2-3.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116354393A (en) * | 2023-05-05 | 2023-06-30 | 广东惠云钛业股份有限公司 | Preparation method of micron-sized titanium dioxide |
| CN118126541A (en) * | 2024-04-30 | 2024-06-04 | 成都先进金属材料产业技术研究院股份有限公司 | Method for improving SCX value of coloring basal phase of titanium dioxide |
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| EP0186370A2 (en) * | 1984-12-10 | 1986-07-02 | Grampian Mining Company Limited | Titanium dioxide pigment production from ilmenite |
| CN101863508A (en) * | 2010-05-26 | 2010-10-20 | 宁波新福钛白粉有限公司 | High-purity mixed-crystal titanium pigment and production method thereof |
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