CN115367792B - Preparation method of sulfuric acid process titanium dioxide hydrolysis composite seed crystal - Google Patents
Preparation method of sulfuric acid process titanium dioxide hydrolysis composite seed crystal Download PDFInfo
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- C01G23/00—Compounds of titanium
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- C01G23/047—Titanium dioxide
- C01G23/053—Producing by wet processes, e.g. hydrolysing titanium salts
- C01G23/0536—Producing by wet processes, e.g. hydrolysing titanium salts by hydrolysing chloride-containing salts
- C01G23/0538—Producing by wet processes, e.g. hydrolysing titanium salts by hydrolysing chloride-containing salts in the presence of seeds
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- 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
- C01G23/0534—Producing by wet processes, e.g. hydrolysing titanium salts by hydrolysing sulfate-containing salts in the presence of seeds
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Abstract
The invention discloses a method for preparing a sulfuric acid process titanium white hydrolysis composite seed crystal, and belongs to the field of preparing titanium dioxide by a sulfuric acid process. The method comprises the following steps: step one: neutralizing with titanium sulfate white solution and alkali solution to prepare anatase seed crystal solution, and preheating the anatase seed crystal solution to 95-98 ℃; step two: preheating a titanium oxychloride solution to 88-92 ℃, uniformly mixing the preheated titanium oxychloride solution with the preheated anatase seed crystal solution, heating to 95-98 ℃, and preserving heat for 90-120 min to obtain the anatase-rutile composite seed crystal solution; step three: and (3) carrying out solid-liquid separation on the anatase-rutile composite seed crystal solution obtained in the step (II), and diluting the solid obtained after the solid-liquid separation with deionized water to be used as a sulfuric acid process titanium dioxide hydrolysis composite seed crystal. The composite seed crystal prepared by the method is stable and can be stored for a long time, has two functions of hydrolysis seed crystal and calcination seed crystal, does not need to be added with calcination seed crystal before calcination, and is beneficial to simplifying the preparation process of titanium white by a sulfuric acid method.
Description
Technical Field
The invention belongs to the technical field of titanium dioxide production by a sulfuric acid method, and particularly relates to a preparation method of a sulfuric acid method titanium dioxide hydrolysis composite seed crystal.
Background
From the aspect of titanium dioxide production technology, the global titanium dioxide at present takes the sulfuric acid method preparation technology as the dominant. The domestic sulfuric acid process titanium white process accounts for more than 90%, and the hydrolysis of the titanium liquid is one of important procedures affecting the quality of the sulfuric acid process titanium white product. In general, there are two processes of autogenous seeding and externally seeding titanium liquid hydrolysis. The self-growing seed crystal does not need to be additionally provided with equipment for manufacturing the seed crystal, but the control in the seed crystal preparation process is difficult, and the process is less adopted in domestic industrial production. The added seed crystal hydrolysis process has the advantages of simple hydrolysis operation, small quality fluctuation among product batches, low requirement on the concentration of hydrolyzed titanium liquid and the like, so the added seed crystal hydrolysis process is favored by manufacturers in industrial production.
Currently, the hydrolysis process with additional seed crystals can be divided into two main categories according to the raw materials for preparing seed crystals. The first is to prepare seed crystal by partially neutralizing titanium liquid (mixed liquid of titanium sulfate and titanyl sulfate) and NaOH solution in the process of preparing titanium white by sulfuric acid method, the prepared seed crystal is anatase type and is commonly adopted by domestic titanium white manufacturers, butThe seed crystal produced by the method has short storage time and must be prepared in situ. Since the seed crystal is anatase, the other prepared rutile seed crystal needs to be added into the meta-titanic acid obtained after the hydrolysis of the titanium liquid to convert the meta-titanic acid into rutile titanium dioxide in the calcining process. The second type is TiCl 4 The aqueous solution and the NaOH solution are used as raw materials to prepare seed crystals, the prepared seed crystals are anatase type and rutile type, and no rutile seed crystal is required to be added before calcination, but the seed crystal preparation technology is difficult and is not applied to domestic factories. The domestic sulfuric acid process titanium dioxide process requires a seed crystal which can induce hydrolysis and promote the transformation of the metatitanic acid into rutile titanium dioxide.
In view of this, the prior art is in need of improvement.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for preparing the sulfuric acid process titanium dioxide hydrolysis composite seed crystal, and the seed crystal prepared by the method is stable and can be stored for a long time, and has two functions of hydrolysis seed crystal and calcination seed crystal.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
according to the invention, a method for preparing sulfuric acid process titanium dioxide hydrolysis composite seed crystal is provided, which is characterized in that: the method comprises the following steps: step one: neutralizing with titanium sulfate white solution and alkali liquor to prepare anatase seed crystal solution, and preheating the prepared anatase seed crystal solution to 95-98 ℃; step two: preheating a titanium oxychloride solution to 88-92 ℃, uniformly mixing the preheated titanium oxychloride solution with the pre-heated anatase seed crystal solution in the step one, heating to 95-98 ℃, and preserving heat for 90-120 min to obtain the anatase-rutile composite seed crystal solution; step three: and (3) carrying out solid-liquid separation on the anatase-rutile composite seed crystal solution obtained in the step (II), and diluting the solid obtained after the solid-liquid separation with deionized water to be used as a sulfuric acid process titanium dioxide hydrolysis composite seed crystal.
According to one embodiment of the invention, in the first step, an alkali solution with the concentration (mass percent concentration) of 8% -12% is preheated to 83 ℃ -85 ℃, titanium sulfate white titanium liquid is preheated to 83 ℃ -85 ℃, preheated titanium sulfate white titanium liquid is added into the preheated alkali solution within 2min, and partial neutralization is carried out to prepare the anatase seed crystal solution.
According to one embodiment of the invention, in the first step, the titanium sulfate white titanium solution is an aqueous solution of a mixture of titanyl sulfate and titanium sulfate, wherein the mixture is generated by reacting sulfuric acid with titanium raw materials during the preparation of titanium white by a sulfuric acid method; in the first step, the alkali liquor is selected from sodium hydroxide solution, potassium hydroxide solution or ammonia water.
According to one embodiment of the invention, after the first step and before the second step, the stability of the anatase seed crystal solution is detected, and the solution with qualified stability can be subjected to the next operation; if 10ml of the anatase seed solution was diluted with distilled water at 25℃until just before turbidity had occurred, the required water volume was 120ml to 130ml, and the stability was considered acceptable.
According to one embodiment of the invention, in step one, the ratio of the lye to the titanium white sulfate solution is alkali/TiO 2 The mass ratio of the alkali to the TiO 2 ＝0.14～0.27。
According to one embodiment of the invention, in the second step, the anatase seed solution and the titanium oxychloride are both metered with titanium dioxide, and the TiO in the anatase seed solution 2 With TiO in titanium oxychloride solution 2 The mass ratio is 10-30%.
According to one embodiment of the invention, in the second step, the anatase seed crystal solution is added into the preheated titanium oxychloride solution and mixed uniformly within 2min, and the temperature is raised to 95-98 ℃ within 3 min.
According to one embodiment of the invention, in the third step, the solid-liquid separation is performed by filtration.
According to one embodiment of the invention, in step three, filtration may be performed using a membrane or filter cloth having a pore size of less than 10 nm.
According to one embodiment of the invention, in the third step, the solid obtained after the solid-liquid separation is diluted with deionized water to a concentration of 150g/L to 200g/L for standby.
By adopting the technical scheme, the invention has the following beneficial effects:
the invention creatively provides a method for preparing a sulfate process titanium white hydrolysis composite seed crystal, which comprises the steps of firstly adopting titanium sulfate white titanium liquid and alkali liquor to neutralize and prepare an anatase seed crystal solution, then mixing a titanium oxychloride solution with the prepared anatase seed crystal solution, and further growing up a composite rutile seed crystal on the anatase seed crystal, thereby preparing the composite seed crystal with both anatase and rutile, wherein the composite seed crystal can be stored for a long time, and no calcination seed crystal is required to be added before calcination, and the seed crystal can play a role in hydrolysis and calcination, thereby advantageously simplifying the preparation procedure of the sulfate process titanium white.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As required, detailed embodiments of the present invention are disclosed in the present specification; however, it is to be understood that the embodiments disclosed herein are merely exemplary of the invention that may be embodied in various and alternative forms. In the following description, a number of operating parameters and components are described in terms of various embodiments contemplated. These specific parameters and components are presented as examples and are not meant to be limiting.
The invention provides a method for preparing sulfuric acid process titanium dioxide hydrolysis composite seed crystal, which comprises the following steps: step one: neutralizing with titanium sulfate white solution and alkali liquor to prepare anatase seed crystal solution, and preheating the prepared anatase seed crystal solution to 95-98 ℃; step two: preheating a titanium oxychloride solution to 88-92 ℃, uniformly mixing the preheated titanium oxychloride solution with the pre-heated anatase seed crystal solution in the step one, heating to 95-98 ℃, and preserving heat for 90-120 min to obtain the anatase-rutile composite seed crystal solution; step three: carrying out solid-liquid separation on the anatase-rutile composite seed crystal solution obtained in the step two, and diluting the solid obtained after the solid-liquid separation with deionized water to be used as sulfurAcid process titanium white hydrolysis composite seed crystal. In the invention, the composite seed crystal with anatase type and rutile type existing simultaneously is prepared by using titanium sulfate white titanium liquid, titanium oxychloride solution and alkali liquor, specifically, the anatase type seed crystal is prepared by using titanium sulfate white titanium liquid firstly, and then the anatase type seed crystal is added into the titanium oxychloride solution, so that the seed crystal is further grown to be greatly compounded with the rutile type seed crystal. The chemical reaction for preparing seed crystal by titanyl sulfate is TiOSO 4 +2NaOH+H 2 O＝Ti(OH) 4 +Na 2 SO 4, In Ti (OH) 4 Under the induction effect, titanium oxychloride reacts TiOCl 2 +H 2 O＝TiO 2 The +2HCl can be stored for a long time, and the calcining seed crystal is not needed to be added before calcining, and the compound seed crystal can play a role in hydrolysis and calcining, thereby advantageously simplifying the preparation process of titanium dioxide by a sulfuric acid method.
The "titanium sulfate white titanium liquid" mentioned in the present invention is an aqueous solution of a mixture of titanyl sulfate and titanium sulfate, which is produced by the reaction of sulfuric acid with a titanium raw material in the preparation of titanium white by sulfuric acid method, and is usually mainly titanyl sulfate. The "lye" referred to in the present invention is selected from sodium hydroxide solution, potassium hydroxide solution or ammonia water, or may be other lye known in the art that can be used for neutralization with titanium sulfate white liquor to prepare anatase seed solution. The alkali solution may be prepared by self-preparing a commercially available solid medicine with desalted water or may be diluted by a commercially available liquid medicine, and the present invention is not limited thereto. The 'titanium oxychloride solution' mentioned in the invention is obtained by removing impurities after the reaction of titanium concentrate and hydrochloric acid, and can be simply written as TiO in the titanium concentrate 2 +2HCl＝TiOCl 2 +H 2 O。
The process for preparing the anatase seed crystal solution by adopting titanium sulfate white titanium liquid and alkali liquor in a neutralization way can be as follows: preheating alkaline liquor with the concentration of 8% -12% to 83-85 ℃, preheating titanium sulfate white liquor to 83-85 ℃, adding the preheated titanium sulfate white liquor into the preheated alkaline liquor within 2min, rapidly and uniformly stirring, and carrying out partial neutralization to prepare the anatase seed crystal solution. In the process, the concentration of the alkali liquor is 8-12 percent so as to ensure that the reaction temperature is within a controllable range; respectively preheating the alkali liquor and the titanium white sulfate liquor to 83-85 ℃, wherein the titanium oxide sulfate liquor cannot be hydrolyzed in advance in the temperature range, and the proper reaction rate after being mixed with the alkali liquor can be ensured; the preheated titanium solution needs to be added into the preheated alkali solution within 2 minutes, the uniformity of the seed crystal is deteriorated when the time exceeds 2 minutes, and the titanium solution is added into the alkali solution to ensure that the reaction grows up in an alkaline environment instead of an acidic environment. Of course, the invention is not limited thereto and other means known in the art may be employed to prepare the anatase seed solution.
In the invention, after the first step and before the second step, the stability of the anatase seed crystal solution is detected, and the solution with qualified stability can be used for the next operation. The criteria for acceptable stability are: when 10ml of the anatase seed solution is diluted with distilled water at 25 ℃ until just before turbidity occurs, the volume of water required for diluting 10ml of the anatase seed solution with distilled water at 25 ℃ until just before turbidity occurs is 120ml to 130ml, namely, the stability is considered to be qualified. For example, after the preheated titanium sulfate white solution is added into the preheated alkali solution and stirred uniformly, the anatase seed crystal solution is heated to 95-98 ℃ within 1-3 min and kept at the temperature, the stability of the titanium solution is continuously detected in the process of keeping the temperature until the stability of the titanium solution reaches the standard, and the second operation can be performed, for example, a proper amount of the titanium solution with qualified stability is taken and put into a preheated titanium oxychloride solution preheater. The stability of the titanium liquid is detected by verifying that the seed crystal is qualified after reaching the standard, and proving that TiOSO with proper proportion occurs in the mixed solution 4 +2NaOH+H 2 O＝Ti(OH) 4 +Na 2 SO 4 And (3) reacting.
In the first step of the invention, the proportion of alkali liquor to titanium white sulfate liquor is alkali/TiO 2 alkali/TiO based on mass ratio 2 ＝0.14～0.27。
In the second step of the invention, the anatase seed crystal solution and the titanium oxychloride are metered by titanium dioxide, and the TiO in the anatase seed crystal solution 2 With TiO in titanium oxychloride solution 2 The mass ratio is 10-30%. In the second step, the anatase seed crystal solution is added into the preheated titanium oxychloride solution within 2minUniformly mixing, and heating to 95-98 ℃ within 3 min.
In the third step of the present invention, the solid-liquid separation is preferably performed by filtration. Preferably, filtration can be performed using a membrane or filter cloth having a pore size of less than 10nm, and the filtration pore size is thin due to the small seed crystals, and in addition, the pore size is easy to remove other ions in the solution, thereby avoiding adverse effects on the induced hydrolysis reaction. In the third step, the solid obtained after solid-liquid separation is diluted by deionized water until the concentration is 150 g/L-200 g/L for standby.
The present invention will be specifically described with reference to the following examples.
Example 1
A. Adding desalted water and caustic soda flakes into a dilute alkali preparation tank to prepare 10% dilute alkali solution, and collecting 0.48m solution 3 Placing the prepared 10% NaOH dilute alkali solution into an alkali solution heating tank, preheating to 85deg.C, and measuring 1.35m 3 A titanium liquid having a concentration of 195g/L was pumped into the titanium liquid preheating tank and preheated to 85℃in this example, the ratio of NaOH to titanium white sulfate titanium liquid was 0.202.
B. Adding the preheated titanium solution with the concentration of 195g/L into the preheated 10% NaOH solution within 2 minutes, rapidly and uniformly stirring, partially neutralizing, heating the mixed solution to 96 ℃ within 2 minutes, preserving heat, and detecting the stability of the titanium solution;
C. the measured volume is 17.55m 3 The titanium oxychloride solution is preheated to 90 ℃, and the concentration of the titanium oxychloride solution is 50g/L (TiO 2 Metering) (in this example, the ratio of titanium liquid to titanium oxychloride solution was 30%), and when the stability of the titanium liquid in step B reached 125ml/10ml, this titanium liquid was added to the preheated titanium oxychloride solution over 2 minutes;
D. uniformly mixing the titanium solution with qualified stability and the titanium oxychloride solution, rapidly heating to 96 ℃ within 3 minutes, and preserving heat for 120 minutes to obtain a composite seed crystal solution;
E. filtering the seed crystal solution by adopting a membrane with the aperture smaller than 10nm or filtering by adopting a fine filter cloth, separating out the solution, and regulating the concentration of the seed crystal to 150g/L by using deionized water for standby.
Example 2
A. Will be 0.0242m 3 Adding 50% alkali solution into seed crystal preparation tank, and adding 0.145m 3 Diluting sodium hydroxide to about 10% with process water, placing prepared 10% NaOH diluted alkali solution into an alkali solution heating tank, preheating to 84 deg.C, and measuring 0.675m 3 A titanium liquid having a concentration of 195g/L was pumped into the titanium liquid preheating tank and preheated to 84℃in this example, the ratio of NaOH to titanium white sulfate titanium liquid was 0.14.
B. Adding the preheated titanium solution with the concentration of 195g/L into the preheated 10% NaOH solution within 2 minutes, rapidly and uniformly stirring, carrying out partial neutralization, heating the mixed solution to 97 ℃ within 2 minutes, preserving heat, and detecting the stability of the titanium solution;
C. the volume is measured to be 13.16m 3 The titanium oxychloride solution is preheated to 90 ℃, and the concentration of the titanium oxychloride solution is 50g/L (TiO 2 Metering) (in this example, the ratio of titanium liquid to titanium oxychloride solution was 20%), and when the stability of the titanium liquid in step B reached 125ml/10ml, this titanium liquid was added to the preheated titanium oxychloride solution over 2 minutes;
D. uniformly mixing the titanium solution with qualified stability and the titanium oxychloride solution, rapidly heating to 96 ℃ within 3 minutes, and preserving heat for 120 minutes to obtain a composite seed crystal solution;
E. filtering the seed crystal solution by adopting a membrane with the aperture smaller than 10nm or filtering by adopting a fine filter cloth, separating out the solution, and regulating the concentration of the seed crystal to 170g/L by using deionized water for standby.
Example 3
A. Adding desalted water and caustic soda flakes into a dilute alkali preparation tank to prepare 8% dilute alkali solution, taking 0.82m 3 Placing the prepared NaOH dilute alkali solution with concentration of 8% into an alkali solution heating tank, preheating to 83 ℃, and measuring 1.35m 3 A titanium liquid having a concentration of 195g/L was pumped into the titanium liquid preheating tank and preheated to 83℃in this example, the ratio of NaOH to titanium white sulfate titanium liquid was 0.27.
B. Adding the preheated titanium solution with the concentration of 195g/L into the preheated 8% NaOH solution within 2 minutes, rapidly and uniformly stirring, carrying out partial neutralization, heating the mixed solution to 95 ℃ within 2 minutes, preserving heat, and detecting the stability of the titanium solution;
C. the measured volume is 43.875m 3 The titanium oxychloride solution is preheated to 88 ℃, and the concentration of the titanium oxychloride solution is 60g/L (TiO 2 Metering) (in this example, the ratio of titanium liquid to titanium oxychloride solution was 10%), and when the stability of the titanium liquid in step B reached 120ml/10ml, this titanium liquid was added to the preheated titanium oxychloride solution within 2 minutes;
D. uniformly mixing the titanium solution with qualified stability and the titanium oxychloride solution, rapidly heating to 95 ℃ within 3 minutes, and preserving heat for 90 minutes to obtain a composite seed crystal solution;
E. filtering the seed crystal solution by adopting a membrane with the aperture smaller than 10nm or filtering by adopting a fine filter cloth, separating out the solution, and regulating the concentration of the seed crystal to be 200g/L by using deionized water for standby.
Example 4
A. Adding desalted water and caustic soda flakes into a dilute alkali preparation tank to prepare dilute alkali solution with concentration of 12%, taking 0.349m 3 Placing the prepared NaOH dilute alkali solution with concentration of 12% into an alkali solution heating tank, preheating to 85 ℃, and measuring 1.35m 3 A titanium liquid having a concentration of 195g/L was pumped into the titanium liquid preheating tank and preheated to 85℃in this example, the ratio of NaOH to titanium white sulfate titanium liquid was 0.18.
B. Adding the preheated titanium solution with the concentration of 195g/L into the preheated 12% NaOH solution within 2 minutes, rapidly and uniformly stirring, partially neutralizing, heating the mixed solution to 98 ℃ within 2 minutes, preserving heat, and detecting the stability of the titanium solution;
C. the measured volume is 17.55m 3 The titanium oxychloride solution is preheated to 92 ℃, and the concentration of the titanium oxychloride solution is 60g/L (TiO 2 Metering) (in this example, the ratio of titanium liquid to titanium oxychloride solution was 25%), and when the stability of the titanium liquid in step B reached 130ml/10ml, this titanium liquid was added to the preheated titanium oxychloride solution over 2 minutes;
D. uniformly mixing the titanium solution with qualified stability and the titanium oxychloride solution, rapidly heating to 98 ℃ within 3 minutes, and preserving heat for 105 minutes to obtain a composite seed crystal solution;
E. filtering the seed crystal solution by adopting a membrane with the aperture smaller than 10nm or filtering by adopting a fine filter cloth, separating out the solution, and regulating the concentration of the seed crystal to 150g/L by using deionized water for standby.
Claims (7)
1. A method for preparing sulfuric acid process titanium dioxide hydrolysis composite seed crystal is characterized in that: the method comprises the following steps:
step one: preheating 8% -12% alkali liquor to 83-85 ℃, preheating titanium sulfate white liquor to 83-85 ℃, adding the preheated titanium sulfate white liquor into the preheated alkali liquor within 2min, carrying out partial neutralization to prepare an anatase seed crystal solution, and preheating the prepared anatase seed crystal solution to 95-98 ℃;
step two: preheating a titanium oxychloride solution to 88-92 ℃, adding the pre-heated anatase seed crystal solution in the step one into the pre-heated titanium oxychloride solution within 2min, uniformly mixing, heating to 95-98 ℃ within 3min, and preserving heat for 90-120 min to obtain the anatase-rutile composite seed crystal solution;
step three: carrying out solid-liquid separation on the anatase-rutile composite seed crystal solution obtained in the step two, diluting the solid obtained after the solid-liquid separation with deionized water, using the diluted solid as a sulfuric acid method titanium dioxide hydrolysis composite seed crystal,
after the first step and before the second step, the stability of the anatase seed crystal solution is detected, and the solution with qualified stability can be subjected to the next operation; if 10ml of the anatase seed solution was diluted with distilled water at 25℃until just before turbidity had occurred, the required water volume was 120ml to 130ml, and the stability was considered acceptable.
2. The method for preparing the sulfuric acid process titanium dioxide hydrolysis composite seed crystal according to claim 1, wherein the method comprises the following steps of: in the first step, the titanium sulfate white titanium liquid is an aqueous solution of a mixture of titanyl sulfate and titanium sulfate, which is generated by the reaction of sulfuric acid and titanium raw materials during the preparation of titanium white by a sulfuric acid method; in the first step, the alkali liquor is selected from sodium hydroxide solution, potassium hydroxide solution or ammonia water.
3. The method for preparing the sulfuric acid process titanium dioxide hydrolysis composite seed crystal according to claim 1, wherein the method comprises the following steps of: in the first step, the ratio of the alkali liquor to the titanium white sulfate liquor is alkali/TiO 2 The mass ratio of the alkali to the TiO 2 ＝0.14～0.27。
4. The method for preparing the sulfuric acid process titanium dioxide hydrolysis composite seed crystal according to claim 1, wherein the method comprises the following steps of: in the second step, the anatase seed crystal solution and the titanium oxychloride are metered by titanium dioxide, and TiO in the anatase seed crystal solution 2 With TiO in titanium oxychloride solution 2 The mass ratio is 10-30%.
5. The method for preparing the sulfuric acid process titanium dioxide hydrolysis composite seed crystal according to claim 1, wherein the method comprises the following steps of: in the third step, solid-liquid separation is performed by adopting a filtering mode.
6. The method for preparing the sulfuric acid process titanium dioxide hydrolysis composite seed crystal according to claim 5, wherein the method comprises the following steps of: in the third step, the membrane or filter cloth with the aperture smaller than 10nm can be used for filtering.
7. The method for preparing the sulfuric acid process titanium dioxide hydrolysis composite seed crystal according to claim 1, wherein the method comprises the following steps of: in the third step, the solid obtained after solid-liquid separation is diluted by deionized water until the concentration is 150 g/L-200 g/L for standby.
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| CN1834019A (en) * | 2006-04-05 | 2006-09-20 | 江苏太白集团有限公司 | Prepn. method of hydrolytic crystal seeds for producing titanium pigment |
| CN109911931A (en) * | 2019-04-16 | 2019-06-21 | 正太新材料科技有限责任公司 | A kind of preparation method of anatase thpe white powder |
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| CN1834019A (en) * | 2006-04-05 | 2006-09-20 | 江苏太白集团有限公司 | Prepn. method of hydrolytic crystal seeds for producing titanium pigment |
| CN109911931A (en) * | 2019-04-16 | 2019-06-21 | 正太新材料科技有限责任公司 | A kind of preparation method of anatase thpe white powder |
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