CN100593517C - Hydrolyzing method for preparing titanium white - Google Patents
Hydrolyzing method for preparing titanium white Download PDFInfo
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- CN100593517C CN100593517C CN200810095242A CN200810095242A CN100593517C CN 100593517 C CN100593517 C CN 100593517C CN 200810095242 A CN200810095242 A CN 200810095242A CN 200810095242 A CN200810095242 A CN 200810095242A CN 100593517 C CN100593517 C CN 100593517C
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 235000010215 titanium dioxide Nutrition 0.000 title claims abstract description 37
- 230000003301 hydrolyzing Effects 0.000 title abstract description 5
- 239000010936 titanium Substances 0.000 claims abstract description 67
- 239000007788 liquid Substances 0.000 claims abstract description 65
- RTAQQCXQSZGOHL-UHFFFAOYSA-N titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 65
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 65
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 238000006460 hydrolysis reaction Methods 0.000 claims description 59
- 238000009835 boiling Methods 0.000 claims description 48
- 239000008367 deionised water Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 16
- 238000010792 warming Methods 0.000 claims description 14
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 230000035800 maturation Effects 0.000 claims description 5
- 238000010790 dilution Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 2
- 230000001186 cumulative Effects 0.000 claims 1
- 238000009826 distribution Methods 0.000 abstract description 22
- 238000005516 engineering process Methods 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000000047 product Substances 0.000 description 15
- OGIDPMRJRNCKJF-UHFFFAOYSA-N TiO Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 9
- LLZRNZOLAXHGLL-UHFFFAOYSA-J Titanic acid Chemical compound O[Ti](O)(O)O LLZRNZOLAXHGLL-UHFFFAOYSA-J 0.000 description 9
- 238000002360 preparation method Methods 0.000 description 8
- 239000004408 titanium dioxide Substances 0.000 description 6
- 238000001354 calcination Methods 0.000 description 4
- 230000002950 deficient Effects 0.000 description 4
- 210000004940 Nucleus Anatomy 0.000 description 3
- 238000004061 bleaching Methods 0.000 description 3
- 239000000084 colloidal system Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000005554 pickling Methods 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 238000010298 pulverizing process Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 238000009283 thermal hydrolysis Methods 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 241000894007 species Species 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- YDZQQRWRVYGNER-UHFFFAOYSA-N iron;titanium;trihydrate Chemical compound O.O.O.[Ti].[Fe] YDZQQRWRVYGNER-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 229910000348 titanium sulfate Inorganic materials 0.000 description 1
- HDUMBHAAKGUHAR-UHFFFAOYSA-J titanium(4+);disulfate Chemical compound [Ti+4].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O HDUMBHAAKGUHAR-UHFFFAOYSA-J 0.000 description 1
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Abstract
The invention relates to a hydrolyzation method for preparing titanium white, and aims to solve the problem of the wide distribution of the grain diameters of the titanium white produced with the prior art. The method is characterized in that the seed crystal titanium liquid and the hydrolyzing liquid are added step by step, and the autogenetic seed crystals are matured step by step, so that the stability, the uniformity and the dispersivity in the titanium are better. By the method, the titanium white product with controllable and narrow distribution of grain diameters can be obtained. The technical proposal adopted is as follows: the paint-grade titanium white product with the half peak breadth of 80 to 100nm can be obtained by controlling the reaction conditions and the technical parameters such as the method of adding the titanium liquid, the quantity of bottom water, the quantity of seed crystals, the time for maturing the seed crystals, the feeding speed, the concentration of thetitanium liquid, etc. Furthermore, the method needs no further production equipment. Therefore, compared with the prior industrial hydrolyzing technology, the method has the advantages of strong adaptability, high product quality, etc.
Description
Technical field
The present invention relates to a kind of method for hydrolysis for preparing titanium white, particularly a kind of method that in the production technique of Titanium White Production By Sulfuric Acid Process, prepares the titanium white of narrow diameter distribution.
Background technology
One of critical process that influences the sulfate process titanium dioxide quality is hydrolysis, and the formation of crystal seed is the key of hydrolysis.The quantity of crystal seed and composition have determined the composition of hydrolysis metatitanic acid, have also determined the quality of the finished product.
At present, domestic what generally adopt is the self-seed pressure hydrolysis technology, that is, the normal pressure dense titanium liquid of heat down adds method for hydrolysis in the end water of heat with certain speed.Though adopt this technology to improve the quality of China's titanium white product to a great extent, crystal seed prepares and the core technology of other operation owing to fail really to grasp, and therefore, quality product improves and be not obvious.Adopt the self-seed pressure hydrolysis technology, the preparation condition of crystal seed is restive than plus seed, is difficult to obtain the even and regular crystal seed of size distribution, thereby cause the size distribution of product bad, particle is inhomogeneous, and peak width at half height is greater than 100nm, and polydispersity index is greater than 0.2.
" hydrolysis problem of the titanium of having a talk liquid " (non-ferrous metal (smelting part), 2001,01, p46) mention crystal seed titanium liquid and hydrolysis main body titanium liquid and separately add, but its main body titanium liquid is to add immediately when milky white takes place crystal seed, does not have maturing process.Generally, in a single day crystal seed titanium liquid add end water and will generate milky precipitation.Along with the continuous adding of crystal seed titanium liquid, this milky white precipitate can be formed limpid solution by molten clear.Along with the carrying out of slaking, clear solution can be separated out milky white precipitate again at last.At this moment, the particle of milky white precipitate is very thin, the chemically reactive height.If add the dense titanium liquid of heat immediately, will there be partly precipitated dissolved, cause crystal seed quantity to reduce, influence end product quality.This method must adopt the fast reinforced system of titanium liquid in slow earlier back just can avoid the part crystal seed dissolved with just the method for hydrolysis at the disposable adding titanium liquid of industrial application is the same." crystal seed is to the influence research of titanium sulfate liquid hydrolytic process " (modern coating and application, 2003,06, P43) provide a kind of method for preparing the titanium white of narrow diameter distribution, but the core of this method is the preparation method of control plus seed, that is, titanium liquid adds the preparation method of alkali.This method only is suitable for the plus seed hydrolysis process.The 02146104.X patent of invention has proposed the method that a kind of economic benefits and social benefits crystal seed method prepares the rutile titanium white powder.The core of this method is to add SnCl in the preparation crystal seed
2, make it to form and a kind ofly can be used for the economic benefits and social benefits crystal seed that hydrolysis crystal seed can be used for calcining seeds again.This crystal seed only is applicable to the plus seed hydrolysis method.No. 200610039318.6 patent of invention proposed a kind of preparation method who is used to produce the hydrolysis crystal seed of titanium dioxide.This method can the processability excellence titanium dioxide, but hydrolysis method is the normal pressure plus seed.
As seen, in existing self-seed pressure hydrolysis technology, have shortcomings such as the part crystal seed is dissolved, product cut size skewness.
Summary of the invention
The objective of the invention is to, on existing self-seed pressure hydrolysis technical foundation, study a kind of technology for hydrolyzing for preparing the titanium white product of narrow diameter distribution, it is wide to overcome in the prior art size distribution of product, defective such as particle is inhomogeneous.
The invention provides a kind of method for hydrolysis for preparing titanium white, be characterized in the method that adopts crystal seed titanium liquid and hydrolysis titanium liquid to add step by step, and substep slaking automatic growing crystal species, make its stability, uniformity and the dispersiveness in titanium liquid better, adopt this automatic growing crystal species to be hydrolyzed, can prepare the titanium white product of narrow diameter distribution.
The technical solution adopted for the present invention to solve the technical problems is implemented as follows:
(1) getting volume is that hydrolysis titanium liquid amasss 20%～30%, and the deionized water that is boiling state adds hydrolyzer as end water, stirs also to keep boiling;
(2) the crystal seed titanium liquid that will account for hydrolysis titanium liquid total amount 1%～3% joins in the water of the above-mentioned end, and the pH value of guarantee system is less than 2.55, and the maintenance system is slight boiling condition 5～15min under whipped state;
(3) will be preheated to 90～98 ℃ under whipped state, concentration is the hydrolysis titanium liquid of 200～240g/l, at the uniform velocity add in the hydrolyzer in 15～20min.Keeping system temperature in the reinforced process is 90～98 ℃;
(4) begin to be warming up to first boiling point after stirring 4～6min, keep thereafter that system is little boils, the temperature rise rate that is warming up to first boiling point is 0.7～2.0 ℃/min;
(5) treat to stop to heat 20～40min after system becomes ash, stirring velocity is 0～6rpm, is warming up to second boiling point subsequently under whipped state, and its temperature rise rate is 0.6～1.2 ℃/min;
(6) be warming up to behind the second boiling point 60min to system and at the uniform velocity replenish ebullient, account for the deionized water of hydrolysis titanium liquid and end hydration level 20%～30%;
(7) 2.5～3.0h hydrolysis of boiling back finishes for the second time.
Specifically, according to an aspect of the present invention, provide a kind of method for hydrolysis for preparing titanium white, it is characterized in that this method may further comprise the steps:
(1) heating end water: will be boiling state deionized water add hydrolyzer and form hydrolyzation system, heating also keeps being slight boiling condition;
(2) add crystal seed titanium liquid and slaking: crystal seed titanium liquid is joined end water, and little the boiling of maintenance system carried out the maturing process first time, and the curing time that add in the maturation stage behind the crystal seed first time is 5～15min;
(3) add hydrolysis titanium liquid and slaking: the hydrolysis titanium liquid of preheating is added hydrolyzer, and the maturing process second time is carried out in heating and insulation, and the temperature of system remains on 90～98 ℃, and the curing time that adds behind the titanium liquid is 4～6min;
(4) intensification and slaking: continue heating systems to first boiling point that seethes with excitement,, promptly turn grey point when reaction system is Steel Grey, stop heating and stirring, or stop heating but slowly stir, carry out maturing process for the third time, become the time that stops to heat behind the ash point for the third time in the maturation stage and be 20～40min;
(5) heat up, be incubated and add dilution water: under whipped state, be warming up to the boiling second boiling point, and the maintenance system is slight boiling condition, then, replenishes deionized water, finish until reaction to reaction system.
The invention has the advantages that: separately add crystal seed titanium liquid and hydrolysis titanium liquid by adopting, the mode of substep slaking crystal seed, avoided the part crystal seed dissolved, the quantity that makes crystal seed accurately, the composition of crystal seed evenly, crystal seed being uniformly dispersed in titanium liquid, under the condition that does not change existing equipment, can prepare the titanium white product of narrow diameter distribution.
Description of drawings
Describe the preferred embodiments of the present invention in detail by the reference accompanying drawing, above-mentioned and other feature and advantage of the present invention will become clearer for those of ordinary skills, wherein:
Fig. 1 is the size distribution figure according to the titanium white of first embodiment of the invention preparation;
Fig. 2 is the size distribution figure according to the titanium white of second embodiment of the invention preparation;
Fig. 3 is the size distribution figure according to the titanium white of third embodiment of the invention preparation.
Embodiment
Embodiment is described in detail the present invention below by reference.It should be noted, in this manual titanium liquid is stated as " crystal seed titanium liquid " and " hydrolysis titanium liquid " respectively, its reason is for the convenience on narrating on the one hand, be because in order to prepare high-grade titanium white on the other hand, (for example produce titanium liquid) when particularly titanium liquid quality index is bad with titanium slag, the crystal seed titanium liquid of this moment is necessary for the titanium liquid of producing with ilmenite, and the F value can not be too high, be between 1.7～1.8.Specific targets are as shown in table 1.
Table 1 crystal seed titanium liquid and hydrolysis titanium liquid quality index
| TiO 2g/l | Ti 3+g/l | Fe/TiO 2 | The F value | Stability | Solid content g/l |
| Hydrolysis titanium liquid | 200～240 | 3.0～5.0 | 0.10～0.30 | 1.7～2.0 | ＞350ml | ＜0.050 |
| Crystal seed titanium liquid | 100～240 | 3.0～5.0 | 0.26～0.29 | 1.7～1.8 | ＞350ml | ＜0.035 |
Embodiment 1
To be heated to boiling as the deionized water of end water earlier, the volume that will be boiling state then is that the deionized water of 100ml adds in the hydrolyzer, stirs and the maintenance slight boiling condition.Get crystal seed titanium liquid 5ml and add at the bottom of the above-mentioned ebullient in the water to form hydrolyzation system, system pH is 2.5, and the maintenance system is little boils, and carries out slaking first time 5min under whipped state, along with the carrying out of slaking, and colloid Ti (OH)
4At first be transformed into TiO
2+Ion, thermal hydrolysis generates stabilized uniform TiO (OH) subsequently
2Crystal seed is avoided the part crystal seed because acidity is high and can not be made TiO
2+Be converted into TiO (OH)
2, cause the defective of number of seeds quantity not sufficient.To be preheated to 90 ℃, concentration is the hydrolysis titanium liquid 500ml of 200g/l, at the uniform velocity adds in the hydrolyzer in 15min.Keeping system temperature in the reinforced process is 90 ℃.Slaking second time 4min is carried out in the reinforced back that finishes under whipped state, crystal seed is evenly distributed in the titanium liquid.Then system is warming up to first boiling point (about 102 ℃), keeping heat-up rate is about 2.0 ℃/min, and be 6min its heat-up time, and the maintenance system is little boils.The system for the treatment of is and stops heating after the Steel Grey (promptly turing grey point) and stir, and carries out slaking 20min for the third time, and along with the carrying out of slaking for the third time, the metatitanic acid that makes generation is formed centrally stabilized uniform TiO (OH) in nucleus being
2A coacervate, thus make hydrolysis metatitanic acid size distribution even.Under whipped state, system is warming up to second boiling point (about 106 ℃) subsequently, keeping heat-up rate is about 1.2 ℃/min, be 15min heat-up time, and the maintenance system is slight boiling condition, reach behind the second boiling point 60min and at the uniform velocity replenish ebullient deionized water 120ml, with regulator solution concentration and promote proceeding of hydrolysis reaction, finish until the 1.5h posthydrolysis to system.Gained hydrolysis slurry obtains the titanium white product through pickling, bleaching, washing, salt processing, calcining, pulverizing.
The size distribution of gained titanium white as shown in Figure 1.As shown in Figure 1, gained titanium white product median size 296.1nm, peak width at half height only is 96.06nm, polydispersity index only is 0.185.The peak width at half height of producing with traditional technology is greater than 100nm, and polydispersity index is compared greater than 0.2 titanium dioxide, and its size distribution obviously narrows down.
Embodiment 2
To be heated to boiling as the deionized water of end water earlier, the volume that will be boiling state then is that the deionized water of 125ml adds in the hydrolyzer, stirs and the maintenance slight boiling condition.Get crystal seed titanium liquid 10ml and add at the bottom of the above-mentioned ebullient in the water to form hydrolyzation system, system pH is 2.2, and the maintenance system is little boils, and carries out slaking first time 10min under whipped state.Along with the carrying out of slaking, the colloid titanium hydroxide at first is transformed into TiO
2+Ion, thermal hydrolysis generates stabilized uniform TiO (OH) subsequently
2Crystal seed is avoided the part crystal seed because acidity is high and can not be made TiO
2+Be converted into TiO (OH)
2, cause the defective of number of seeds quantity not sufficient.To be preheated to 93 ℃, concentration is the hydrolysis titanium liquid 500ml of 220g/l, at the uniform velocity adds in the hydrolyzer in 18min.Keeping system temperature in the reinforced process is 95 ℃.Slaking second time 5min is carried out in the reinforced back that finishes under whipped state, crystal seed is evenly distributed in the titanium liquid.Then system is warming up to first boiling point (about 104 ℃), keeping heat-up rate is about 1.1 ℃/min, and be 8min its heat-up time, and the maintenance system is little boils.The system for the treatment of is and stops heating after the Steel Grey (promptly turing grey point) and carry out slaking 30min for the third time, continues this moment to stir, and mixing speed is 4rpm, and along with the carrying out of slaking for the third time, the metatitanic acid that makes generation is formed centrally stabilized uniform TiO (OH) in nucleus being
2A coacervate, thus make hydrolysis metatitanic acid size distribution even.Under whipped state, system is warming up to second boiling point (about 108 ℃) subsequently, keeping heat-up rate is about 1.0 ℃/min, be 20min heat-up time, and the maintenance system is slight boiling condition, reach behind the second boiling point 60min and at the uniform velocity replenish ebullient deionized water 187ml, with regulator solution concentration and promote proceeding of hydrolysis reaction, finish until the 1.5h posthydrolysis to system.Gained hydrolysis slurry obtains the titanium white product through pickling, bleaching, washing, salt processing, calcining, pulverizing.
The size distribution of gained titanium white as shown in Figure 2.As shown in Figure 2, gained titanium white product median size 273.7nm, peak width at half height only is 97.42nm, polydispersity index only is 0.142.The peak width at half height of producing with traditional technology is greater than 100nm, and polydispersity index is compared greater than 0.2 titanium dioxide, and its size distribution obviously narrows down.
Embodiment 3
To be heated to boiling as the deionized water of end water earlier, the volume that will be boiling state then is that the deionized water of 150ml adds in the hydrolyzer, stirs and the maintenance slight boiling condition.Get crystal seed titanium liquid 15ml and add at the bottom of the above-mentioned ebullient in the water to form hydrolyzation system, system pH is 2.0, and the maintenance system is little boils, and carries out slaking first time 15min under whipped state.Along with the carrying out of slaking, the colloid titanium hydroxide at first is transformed into TiO
2+Ion, thermal hydrolysis generates stabilized uniform TiO (OH) subsequently
2Crystal seed is avoided the part crystal seed because acidity is high and can not be made TiO
2+Be converted into TiO (OH)
2, cause the defective of number of seeds quantity not sufficient.To be preheated to 98 ℃, concentration is the hydrolysis titanium liquid 500ml of 240g/l, at the uniform velocity adds in the hydrolyzer in 20min.Keeping system temperature in the reinforced process is 98 ℃.Slaking second time 6min is carried out in the reinforced back that finishes under whipped state, along with the carrying out of the slaking second time, crystal seed is evenly distributed in the titanium liquid.Then system is warming up to first boiling point (about 106 ℃), keeping heat-up rate is about 0.7 ℃/min, and be 11min its heat-up time, and the maintenance system is little boils.The system for the treatment of is and stops heating after the Steel Grey (promptly turing grey point) and carry out slaking 40min for the third time, continues this moment to stir, and mixing speed is 6rpm, and along with the carrying out of slaking for the third time, the metatitanic acid that makes generation is formed centrally stabilized uniform TiO (OH) in nucleus being
2A coacervate, thus make hydrolysis metatitanic acid size distribution even.Under whipped state, system is warming up to second boiling point (about 110 ℃) subsequently, keeping heat-up rate is about 0.6 ℃/min, be 24min heat-up time, and the maintenance system is slight boiling condition, reach behind the second boiling point 60min and at the uniform velocity replenish ebullient deionized water 159ml, with regulator solution concentration and promote proceeding of hydrolysis reaction, finish until the 2.0h posthydrolysis to system.Gained hydrolysis slurry obtains the titanium white product through pickling, bleaching, washing, salt processing, calcining, pulverizing.
The size distribution of gained titanium white as shown in Figure 3.As shown in Figure 3, gained titanium white product median size 233.6nm, peak width at half height only is 82.46nm, polydispersity index only is 0.168.The peak width at half height of producing with traditional technology is greater than 100nm, and polydispersity index is compared greater than 0.2 titanium dioxide, and its size distribution obviously narrows down.
Disclosed herein is exemplary embodiment of the present invention,, only use and explain these particular term with the descriptive meaning with general though used specific term, rather than the purpose of restriction.Therefore, it will be understood by those skilled in the art that and under the situation that does not break away from the spirit and scope of the present invention of setting forth as claim, can make a change in form and details.
Claims (8)
1, a kind of method for hydrolysis for preparing titanium white is characterized in that this method may further comprise the steps:
(1) heating end water: will be boiling state deionized water add hydrolyzer and form hydrolyzation system, heating also keeps being slight boiling condition;
(2) add crystal seed titanium liquid and slaking: crystal seed titanium liquid is joined end water, and little the boiling of maintenance system carried out the maturing process first time, and the curing time that add in the maturation stage behind the crystal seed first time is 5～15min;
(3) add hydrolysis titanium liquid and slaking: the hydrolysis titanium liquid of preheating is added hydrolyzer, and the maturing process second time is carried out in heating and insulation, and the temperature of system remains on 90～98 ℃, and the curing time that adds behind the titanium liquid is 4～6min;
(4) intensification and slaking: continue heating systems to first boiling point that seethes with excitement,, promptly turn grey point when reaction system is Steel Grey, stop heating and stirring, or stop heating but slowly stir, carry out maturing process for the third time, become the time that stops to heat behind the ash point for the third time in the maturation stage and be 20～40min;
(5) heat up, be incubated and add dilution water: under whipped state, be warming up to the boiling second boiling point, and the maintenance system is slight boiling condition, then, replenishes deionized water, finish until reaction to reaction system.
2, method for hydrolysis as claimed in claim 1, the amount that it is characterized in that heating the deionized water in the end water step is 20%～30% of a hydrolysis titanium liquid cumulative volume.
3, method for hydrolysis as claimed in claim 1, the amount that it is characterized in that adding crystal seed titanium liquid in the crystal seed titanium liquid step is 1%～3% of a hydrolysis titanium liquid total amount, and after adding crystal seed titanium liquid, the pH value of system is less than 2.55.
4, method for hydrolysis as claimed in claim 1 is characterized in that adding in the hydrolysis titanium liquid step used hydrolysis titanium concentration with TiO
2Count 200～240g/l, the reinforced time of titanium liquid is 15～20min, and feed rate is at the uniform velocity.
5, method for hydrolysis as claimed in claim 1 is characterized in that being warming up to that temperature rise rate is 0.7～2.0 ℃/min in the first boiling point step.
6, method for hydrolysis as claimed in claim 1, after it is characterized in that for the third time becoming the ash point in the maturation stage, mixing speed is 0～6rpm.
7, method for hydrolysis as claimed in claim 1 is characterized in that being warming up to that temperature rise rate is 0.6～1.2 ℃/min in the second boiling point step, and the maintenance system behind the second boiling point of reaching is the time 2.5～3.0h of slight boiling condition.
8, method for hydrolysis as claimed in claim 1, it is characterized in that being incubated and adding in the dilution water step, at the uniform velocity replenish the ebullient deionized water to system after reaching second boiling point 60min, finish until hydrolysis, the amount of make up water is 20%～30% of end water and the long-pending resultant of titanium liquid.
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| CN105329941B (en) * | 2015-11-18 | 2017-03-15 | 攀钢集团攀枝花钢铁研究院有限公司 | The method for reducing titanium dioxide small particles titanium white |
| CN105502487B (en) * | 2015-12-30 | 2017-06-23 | 攀枝花东方钛业有限公司 | The hydrolysis system and method for a kind of oriented control titanium dioxide particle diameter |
| CN107055602A (en) * | 2017-03-14 | 2017-08-18 | 襄阳龙蟒钛业有限公司 | A kind of low energy consumption method for hydrolysis |
| CN109385118B (en) * | 2018-12-29 | 2021-08-03 | 江苏特丰新材料科技有限公司 | Method for preparing blue-bottom phase rutile type titanium dioxide |
| CN112574600A (en) * | 2020-12-30 | 2021-03-30 | 福州钛发科技有限公司 | Preparation method of titanium dioxide for delustering acrylic fiber and chemical fiber |
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