CN109294281B - Preparation method of pigmentary titanium dioxide - Google Patents

Preparation method of pigmentary titanium dioxide Download PDF

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CN109294281B
CN109294281B CN201811391296.9A CN201811391296A CN109294281B CN 109294281 B CN109294281 B CN 109294281B CN 201811391296 A CN201811391296 A CN 201811391296A CN 109294281 B CN109294281 B CN 109294281B
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titanium dioxide
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CN109294281A (en
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刘勇
石瑞成
吴小平
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Chengdu Advanced Metal Materials Industry Technology Research Institute Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/36—Compounds of titanium
    • C09C1/3692—Combinations of treatments provided for in groups C09C1/3615 - C09C1/3684
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/36—Compounds of titanium
    • C09C1/3607—Titanium dioxide
    • C09C1/3653—Treatment with inorganic compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/36—Compounds of titanium
    • C09C1/3607—Titanium dioxide
    • C09C1/3669—Treatment with low-molecular organic compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/36—Compounds of titanium
    • C09C1/3607—Titanium dioxide
    • C09C1/3676—Treatment with macro-molecular organic compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/36—Compounds of titanium
    • C09C1/3607—Titanium dioxide
    • C09C1/3684—Treatment with organo-silicon compounds
    • 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
    • C01P2006/60—Optical properties, e.g. expressed in CIELAB-values

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  • Organic Chemistry (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)

Abstract

The invention belongs to the technical field of inorganic chemical industry, and particularly relates to a preparation method of titanium dioxide pigment. The invention solves the technical problem that the filter cake obtained by the existing preparation method of titanium dioxide has higher water content. The invention provides a preparation method of pigmentary titanium dioxide, which comprises the following steps: a. adding water into metatitanic acid with the iron content lower than 30ppm for pulping to obtain slurry 1 with the titanium dioxide concentration of 200-450 g/L; b. adding an organic modifier into the slurry 1, adding a treating agent, and stirring to obtain a slurry 2; c. and squeezing the slurry 2 into a metatitanic acid filter cake, and then calcining to obtain a titanium dioxide primary product. The solid content of the metatitanic acid filter cake prepared by the method is improved from less than 60 percent to about 70 percent, and the energy consumption required by dehydration is saved.

Description

Preparation method of pigmentary titanium dioxide
Technical Field
The invention belongs to the technical field of inorganic chemical industry, and particularly relates to a preparation method of titanium dioxide pigment.
Background
Titanium dioxide is considered to be the best white pigment in the world due to the characteristics of high refractive index, good whiteness and glossiness and no toxicity, and is widely applied to the fields of coatings, plastics, papermaking, printing ink, chemical fibers, rubber and the like.
At present, the main production process of titanium dioxide by a sulfuric acid method comprises the following steps: (1) acid hydrolysis: carrying out acidolysis reaction on the titanium concentrate or the titanium slag and sulfuric acid to obtain a titanyl sulfate solution; (2) hydrolysis: hydrolyzing the titanyl sulfate solution to obtain metatitanic acid slurry; (3) removing impurities: washing and bleaching the metatitanic acid slurry to obtain washing qualified metatitanic acid; (4) salt treatment: washing the qualified metatitanic acid with water, and performing salt treatment and squeezing to obtain metatitanic acid before kiln; (5) and (3) calcining: the metatitanic acid before the kiln enters a rotary kiln and is calcined to obtain a primary titanium dioxide product; (6) intermediate crushing: carrying out dry grinding and wet grinding on the primary titanium dioxide to obtain primary slurry; (7) and (3) post-treatment: and (4) carrying out post-treatment on the primary slurry to obtain a titanium dioxide product. The metatitanic acid squeezed after salt treatment enters a rotary kiln through a discharging hopper and a feeding screw to be calcined, and metatitanic acid particles are mutually aggregated to form blocks, so that the metatitanic acid particles are not easy to be completely burnt in the calcining process, the calcining temperature is high, the sintering and calcining unevenness are easy to occur, the performance of the primary pigment obtained by calcining is not high, and the number of coarse particles is large. In addition, the water content of the filter cake is high, the energy consumption required by dehydration is high, the flowability of the filter cake is poor, the filter cake is easy to block at the positions of the feeding hopper and the feeding screw, manual blockage removal is needed, and the labor intensity is high.
Patent document CN104477981A discloses a method for preparing high purity titanium dioxide, which comprises the following steps: (1) adding water into metatitanic acid for pulping, and adjusting the slurry until the concentration of titanium dioxide is 300-600 g/L; (2) adding a depolymerizing agent into the slurry for dispersion, and then adding an alkaline solvent to adjust the pH value to 7-10; (3) squeezing the slurry obtained in the step (2), washing with water, adding water for pulping, and adjusting the slurry to the titanium dioxide concentration of 300-600 g/L; (4) adding a depolymerizing agent into the slurry obtained in the step (3) for dispersion, and then adding an acid solvent to adjust the pH value to 1.0-2.0; (5) and (4) squeezing the slurry obtained in the step (4), washing with water, calcining, cooling and crushing to obtain the high-purity titanium dioxide product. According to the method, the depolymerizing agent is added to depolymerize metatitanic acid and repeatedly wash to remove impurities to prepare high-purity titanium dioxide, but the depolymerizing agent is hydrophilic, so that the aims of improving the solid content of a filter cake, loosening the filter cake and reducing the sintering of titanium dioxide in the calcining process cannot be fulfilled.
Disclosure of Invention
The invention aims to solve the technical problem that the filter cake obtained by the existing titanium dioxide preparation method has higher water content.
The technical scheme adopted by the invention for solving the technical problem is to provide a preparation method of titanium dioxide pigment. The method comprises the following steps: a. adding water into metatitanic acid with the iron content lower than 30ppm for pulping to obtain slurry 1 with the titanium dioxide concentration of 200-450 g/L; b. adding an organic modifier into the slurry 1, adding a treating agent, and stirring to obtain a slurry 2; the treating agent comprises potassium salt, phosphoric acid, zinc salt and aluminum salt; the organic modifier is a small molecule with a hydrophilic group and a hydrophobic group or a polymer with a hydrophilic group and a hydrophobic group; c. and squeezing the slurry 2 into a metatitanic acid filter cake, and then calcining to obtain a titanium dioxide primary product.
Further, the organic modifier comprises at least one of alkyl carboxylic acid, alkylamine, alkyl phosphoric acid, alkyl sulfonic acid, alkyl carboxylate, alkyl amine salt, alkyl phosphate, alkyl sulfonate, silane coupling agent, polyethylene glycol-polystyrene copolymer, polyacrylic acid-polystyrene copolymer, polylactic acid-polyethylene glycol copolymer and poly-caprolactone-polyethylene glycol.
Further, the organic modifier comprises at least one of sodium stearate, sodium oleate, octyl triethoxysilane and cetyl trimethyl ammonium bromide.
Wherein, in the preparation method of the titanium dioxide pigment, the amount of the added organic modifier is 0.01-5 wt% of the titanium dioxide in the metatitanic acid.
In the preparation method of the titanium dioxide pigment, in the step b, when the anatase type titanium dioxide is prepared, the potassium salt of the treating agent and the phosphoric acid are added simultaneously; when rutile titanium dioxide is produced, the treating agents potassium, phosphoric and zinc salts or potassium, phosphoric and aluminum salts are added simultaneously.
In the preparation method of the pigment titanium dioxide, the potassium salt is at least one of potassium hydroxide, potassium carbonate, potassium sulfate and potassium chloride; the zinc salt is at least one of zinc oxide, zinc chloride and zinc sulfate; the aluminum salt is at least one of aluminum oxide and aluminum sulfate.
Wherein, in the preparation method of the pigment titanium dioxide, the addition amount of the potassium salt is K2O accounts for 0.05 to 1.0 weight percent of the titanium dioxide in the slurry 1; the phosphoric acid is added in an amount of P2O5Calculated as 0.01 wt% to 1.0 wt% of the titanium dioxide in slurry 1; the addition of the zinc salt is 0.05 wt% -1.0 wt% of the titanium dioxide in the slurry 1 calculated by ZnO; the aluminum salt is added in an amount of Al2O3Calculated as 0.05 wt% to 1.0 wt% of the titanium dioxide in slurry 1.
Wherein, in the step c, the calcination is carried out at 200-1200 ℃ for 2-12 h.
In the preparation method of the pigment titanium dioxide, in the step c, the titanium dioxide primary product obtained by calcining is rutile type or anatase type.
The invention has the beneficial effects that:
according to the method, after the organic modifier is added into the titanium dioxide slurry, the solid content of the finally prepared metatitanic acid filter cake is increased from less than 60% to about 70%, so that the energy consumption required by dehydration is saved; and the feed opening has no blocking phenomenon, thereby improving the fluidity of the filter cake and reducing the labor intensity. By the method, the temperature of the calcining kiln head is reduced by about 50 ℃, the consumption of natural gas is reduced, and the occurrence of particle sintering is effectively reduced. By the method, the brightness of the prepared titanium dioxide primary product is improved by about 0.3, and the pigment performance of the primary product is improved. The method is simple and convenient to operate and easy to realize industrial production.
Detailed Description
The metatitanic acid filter cake prepared by the existing method has higher water content and higher energy consumption required by dehydration, and through a great deal of research, the inventor invents that after adding a micromolecule with hydrophilic groups and hydrophobic groups or an organic modifier of a polymer with hydrophilic groups and hydrophobic groups, the solid content of the metatitanic acid filter cake prepared by the method is obviously improved, and the energy consumption is reduced. Meanwhile, the pigment performance of the titanium dioxide primary product is improved.
The invention provides a preparation method of pigment titanium dioxide, which comprises the following steps: a. adding water into metatitanic acid with the iron content lower than 30ppm for pulping to obtain slurry 1 with the titanium dioxide concentration of 200-450 g/L; b. adding an organic modifier into the slurry 1, adding a treating agent, and stirring to obtain a slurry 2; the treating agent comprises potassium salt, phosphoric acid, zinc salt and aluminum salt; b. adding an organic modifier into the slurry 1, adding a treating agent, and stirring to obtain a slurry 2; the treating agent comprises potassium salt, phosphoric acid, zinc salt and aluminum salt; the organic modifier is a small molecule with a hydrophilic group and a hydrophobic group or a polymer with a hydrophilic group and a hydrophobic group; c. and squeezing the slurry 2 into a metatitanic acid filter cake, and then calcining to obtain a titanium dioxide primary product.
In the preparation method of the pigmentary titanium dioxide, in the step b, the organic modifier is a small molecule with a hydrophilic group and a hydrophobic group or a polymer with a hydrophilic group and a hydrophobic group.
Further, the organic modifier comprises at least one of alkyl carboxylic acid, alkylamine, alkyl phosphoric acid, alkyl sulfonic acid, alkyl carboxylate, alkyl amine salt, alkyl phosphate, alkyl sulfonate, silane coupling agent, polyethylene glycol-polystyrene copolymer, polyacrylic acid-polystyrene copolymer, polylactic acid-polyethylene glycol copolymer and poly-caprolactone-polyethylene glycol.
Further, the organic modifier comprises at least one of sodium stearate, sodium oleate, octyl triethoxysilane and cetyl trimethyl ammonium bromide. Because of the advantages of the structure, the water content of the metatitanic acid filter cake is lower.
In the invention, because the metatitanic acid is hydrated titanium dioxide, the surface of the titanium dioxide has a large amount of hydroxyl groups, the hydroxyl groups are interacted through hydrogen bonds and the like, the binding force between the metatitanic acid is enhanced, and free water is wrapped in gaps among metatitanic acid particles, so that the pressed metatitanic acid is agglomerated into blocks and has higher water content. The organic modifier has double groups, hydrophilic groups are combined with metatitanic acid, hydrophobic groups are far away from the surface of metatitanic acid particles, and the organic modifier is added into the metatitanic acid qualified by washing to perform hydrophobic modification on the metatitanic acid, so that the surface of the metatitanic acid particles is hydrophobic, and the hydrogen bond interaction between the metatitanic acid and water is reduced, so that the water content of the squeezed metatitanic acid is reduced and the squeezed metatitanic acid is in a loose powder shape.
Wherein, in the preparation method of the titanium dioxide pigment, the amount of the added organic modifier is 0.01-5 wt% of the titanium dioxide in the metatitanic acid. The adding amount of the organic modifier is controlled within a proper range, and the adding amount is too small to achieve the effect of reducing the water content of the metatitanic acid filter cake; if the amount is too large, the calcination temperature will be high, and the performance of the pigmentary titanium dioxide will be lowered.
In the preparation method of the titanium dioxide pigment, in the step b, when the anatase type titanium dioxide is prepared, the potassium salt of the treating agent and the phosphoric acid are added simultaneously; when rutile titanium dioxide is produced, the treating agents potassium, phosphoric and zinc salts or potassium, phosphoric and aluminum salts are added simultaneously.
In the preparation method of the pigment titanium dioxide, the potassium salt is at least one of potassium hydroxide, potassium carbonate, potassium sulfate and potassium chloride; the zinc salt is at least one of zinc oxide, zinc chloride and zinc sulfate; the aluminum salt is at least one of aluminum oxide and aluminum sulfate.
Wherein, in the preparation method of the pigment titanium dioxide, the addition amount of the potassium salt is K2O accounts for 0.05 to 1.0 weight percent of the titanium dioxide in the slurry 1; the phosphoric acid is added in an amount of P2O5Calculated as 0.01 wt% to 1.0 wt% of the titanium dioxide in slurry 1; the addition of the zinc salt is 0.05 wt% -1.0 wt% of the titanium dioxide in the slurry 1 calculated by ZnO; the aluminum salt is added in an amount of Al2O3Calculated as 0.05 wt% to 1.0 wt% of the titanium dioxide in slurry 1. The addition amount of the potassium salt, the phosphoric acid, the zinc salt and the aluminum salt is obtained according to the color property and the content of the calcined titanium dioxide primary product.
Wherein, in the step c, the calcination is carried out at 200-1200 ℃ for 2-12 h. If the rutile type titanium dioxide is calcined, the rutile type titanium dioxide is calcined until the content of the rutile type titanium dioxide is 96.0 to 99.9 percent; if anatase titanium dioxide is calcined, the titanium dioxide is calcined to rutile-free titanium dioxide.
In the preparation method of the pigment titanium dioxide, in the step c, the titanium dioxide primary product obtained by calcining is rutile type or anatase type.
The present invention will be further illustrated by the following specific examples.
Examples 1 to 4 of the present invention are all the preparations of rutile type titanium dioxide.
Example 1
Adding water into metatitanic acid with the iron content lower than 30ppm for pulping to obtain slurry 1 with the titanium dioxide concentration of 300 g/L; adding 0.2 wt% sodium stearate into slurry 1, stirring for 30min, adding salt treating agent potassium hydroxide and phosphoric acidAnd zinc oxide, the addition amount is controlled so that K is in the slurry2O/TiO2＝0.60％，P2O5/TiO2＝0.15％，ZnO/TiO2Stirring for 60min to obtain slurry 2, wherein the weight ratio of the components is 0.30 percent; and (3) sending the slurry 2 into a membrane filter press for squeezing to obtain a metatitanic acid filter cake, detecting the water content of the filter cake, then sending the filter cake into a rotary kiln through a blanking hopper for calcining until the content of rutile titanium dioxide is 98.7% to obtain a titanium dioxide primary product, sampling at a kiln head to detect the rutile conversion rate, the achromatism and the brightness of the calcined primary product, and recording the temperature of the kiln head. The results are shown in Table 1.
Example 2
Adding water into metatitanic acid with the iron content lower than 30ppm for pulping to obtain slurry 1 with the titanium dioxide concentration of 200 g/L; adding 0.5 wt% of sodium oleate into the slurry 1, stirring for 30min, adding salt treating agents of potassium hydroxide, phosphoric acid and zinc oxide, and controlling the adding amount to ensure that K in the slurry is2O/TiO2＝0.40％，P2O5/TiO2＝0.1％，ZnO/TiO2Stirring for 60min to obtain slurry 2, wherein the weight ratio of the components is 0.20 percent; and (3) sending the slurry 2 into a membrane filter press for squeezing to obtain a metatitanic acid filter cake, detecting the water content of the filter cake, then sending the filter cake into a rotary kiln through a blanking hopper for calcining until the content of rutile titanium dioxide is 99.1% to obtain a titanium dioxide primary product, sampling at a kiln head to detect the rutile conversion rate, the achromatism and the brightness of the calcined primary product, and recording the temperature of the kiln head. The results are shown in Table 1.
Example 3
Adding water into metatitanic acid with the iron content lower than 30ppm for pulping to obtain slurry 1 with the titanium dioxide concentration of 400 g/L; adding 1 wt% of polyethylene glycol-polystyrene copolymer into the slurry 1, stirring for 30min, adding salt treating agents of potassium hydroxide, phosphoric acid and aluminum trioxide, and controlling the addition amount to ensure that K in the slurry is2O/TiO2＝0.60％，P2O5/TiO2＝0.10％，Al2O3/TiO2Stirring for 60min to obtain slurry 2, wherein the weight ratio of the components is 0.30 percent; sending the slurry 2 into a membrane filter press for squeezing to obtain a metatitanic acid filter cake, detecting the water content of the filter cake, and then, adding the metatitanic acid filter cake into a filter pressAnd feeding the filter cake into a rotary kiln through a discharge hopper, calcining until the content of rutile titanium dioxide is 98.5% to obtain a titanium dioxide primary product, sampling at a kiln head, detecting the rutile conversion rate, the achromatism and the brightness of the calcined primary product, and recording the temperature of the calcining kiln head. The results are shown in Table 1.
Example 4
Adding water into metatitanic acid with the iron content lower than 30ppm for pulping to obtain slurry 1 with the titanium dioxide concentration of 450 g/L; adding 0.5 wt% of hexadecyl trimethyl ammonium bromide into the slurry 1, stirring for 30min, adding salt treatment agents of potassium hydroxide, phosphoric acid and aluminum trioxide, and controlling the adding amount to ensure that K in the slurry is2O/TiO2＝1.0％，P2O5/TiO2＝0.10％，Al2O3/TiO2Stirring for 60min to obtain slurry 2, wherein the weight ratio of the components is 0.80 percent; and (3) sending the slurry 2 into a membrane filter press for squeezing to obtain a metatitanic acid filter cake, detecting the water content of the filter cake, then sending the filter cake into a rotary kiln through a blanking hopper for calcining until the content of rutile titanium dioxide is 98.8 percent to obtain a titanium dioxide primary product, sampling at a kiln head to detect the rutile conversion rate, the achromatism and the brightness of the calcined primary product, and recording the temperature of the kiln head. The results are shown in Table 1.
Comparative example 1
Adding water into metatitanic acid with the iron content lower than 30ppm for pulping to obtain slurry 1 with the titanium dioxide concentration of 300 g/L; adding salt treating agents such as potassium hydroxide, phosphoric acid and zinc oxide, and controlling the addition amount to ensure that K is contained in the slurry2O/TiO2＝0.6％，P2O5/TiO2＝0.15％，ZnO/TiO2Stirring for 60min to obtain slurry 2, wherein the weight ratio of the components is 0.30 percent; and (3) sending the slurry 2 into a membrane filter press for squeezing to obtain a metatitanic acid filter cake, detecting the water content of the filter cake, then sending the filter cake into a rotary kiln through a blanking hopper for calcining until the content of rutile titanium dioxide is 99.0 percent to obtain a titanium dioxide primary product, sampling at a kiln head to detect the rutile conversion rate, the achromatism and the brightness of the calcined primary product, and recording the temperature of the kiln head. The results are shown in Table 1.
Comparative example 2
Adding water into metatitanic acid with iron content lower than 30ppm, and pulping to obtain dioxideSlurry 1 having a titanium concentration of 300g/L, 0.5 wt% isopropyl alcohol was added to slurry 1; stirring for 30min, adding potassium hydroxide, phosphoric acid and zinc oxide, and controlling the addition amount to make K in the slurry2O/TiO2＝0.4％，P2O5/TiO2＝0.10％，ZnO/TiO2Stirring for 60min to obtain slurry 2, wherein the weight ratio of the components is 0.20 percent; and (3) sending the slurry 2 into a membrane filter press for squeezing to obtain a metatitanic acid filter cake, detecting the water content of the filter cake, then sending the filter cake into a rotary kiln through a blanking hopper for calcining until the content of rutile titanium dioxide is 99.2% to obtain a titanium dioxide primary product, sampling at a kiln head to detect the rutile conversion rate, the achromatism and the brightness of the calcined primary product, and recording the temperature of the kiln head. The results are shown in Table 1.
TABLE 1 results of primary detection of metatitanic acid and titanium dioxide in examples and comparative examples of the present invention
Figure BDA0001874121110000061
As can be seen from Table 1, after the organic modification reagent is added, the solid content of the metatitanic acid filter cake is increased from less than 60% to about 70%, the material feeding opening has no blocking phenomenon, the temperature of the calcining kiln head is reduced by about 50 ℃, the consumption of natural gas is reduced, and the occurrence of particle sintering is effectively reduced. The decoloring capacity of the titanium dioxide primary product obtained by calcining is high by about 50 Reynolds numbers, the brightness is high by about 0.3, and the pigment performance of the titanium dioxide primary product is obviously improved. If the organic modifying reagent which is not provided by the invention is added, the corresponding effect cannot be achieved, and the solid content of the filter cake, the calcining temperature and the performance of the primary pigment cannot achieve the effect of the invention.

Claims (5)

1. The preparation method of the pigment titanium dioxide is characterized by comprising the following steps:
a. adding water into metatitanic acid with the iron content lower than 30ppm for pulping to obtain slurry 1 with the titanium dioxide concentration of 200-450 g/L;
b. adding an organic modifier into the slurry 1, adding a treating agent, and stirring to obtain a slurry 2; the treating agent comprises potassium hydroxide or potassium salt, phosphoric acid, zinc oxide or zinc salt and aluminum oxide or aluminum salt; the organic modifier is at least one of alkyl carboxylic acid, alkylamine, alkyl phosphoric acid, alkyl sulfonic acid, alkyl carboxylate, alkylamine salt, alkyl phosphate, alkyl sulfonate, silane coupling agent, polyethylene glycol-polystyrene copolymer, polyacrylic acid-polystyrene copolymer, polylactic acid-polyethylene glycol copolymer and poly-caprolactone-polyethylene glycol; the amount of the added organic modifier is 0.01-5 wt% of titanium dioxide in metatitanic acid; when preparing anatase titanium dioxide, adding potassium hydroxide or potassium salt as treating agent and phosphoric acid at the same time; when preparing rutile titanium dioxide, adding potassium hydroxide or potassium salt, phosphoric acid and zinc oxide or zinc salt or potassium hydroxide or potassium salt, phosphoric acid and aluminum oxide or aluminum salt at the same time;
c. and squeezing the slurry 2 into a metatitanic acid filter cake, and then calcining to obtain a rutile type or anatase type titanium dioxide primary product.
2. The process for producing pigmentary titanium dioxide as claimed in claim 1, wherein: the organic modifier comprises at least one of sodium stearate, sodium oleate, octyl triethoxysilane and hexadecyl trimethyl ammonium bromide.
3. The process for producing pigmentary titanium dioxide as claimed in claim 1, wherein: the potassium salt is at least one of potassium carbonate, potassium sulfate and potassium chloride; the zinc salt is at least one of zinc chloride and zinc sulfate; the aluminum salt is aluminum sulfate.
4. The process for producing pigmentary titanium dioxide as claimed in claim 1, wherein: the potassium hydroxide or potassium salt is added in an amount of K2O accounts for 0.05 to 1.0 weight percent of the titanium dioxide in the slurry 1; the phosphoric acid is added in an amount of P2O5Calculated as 0.01 wt% to 1.0 wt% of the titanium dioxide in slurry 1; the addition of the zinc oxide or zinc salt is 0.05 to 1.0 weight percent of the titanium dioxide in the slurry 1 calculated by ZnO; the addition amount of the aluminum oxide or the aluminum salt is Al2O3Calculated as dioxygen in slurry 10.05 wt% to 1.0 wt% of titanium compound.
5. The process for producing pigmentary titanium dioxide as claimed in claim 1, wherein: in the step c, the calcination is carried out at 200-1200 ℃ for 2-12 h.
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