CN114684852A - Reduction removal process for removing high-valence iron in metatitanic acid titanium dioxide slurry by using reducing agent - Google Patents
Reduction removal process for removing high-valence iron in metatitanic acid titanium dioxide slurry by using reducing agent Download PDFInfo
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- CN114684852A CN114684852A CN202011584013.XA CN202011584013A CN114684852A CN 114684852 A CN114684852 A CN 114684852A CN 202011584013 A CN202011584013 A CN 202011584013A CN 114684852 A CN114684852 A CN 114684852A
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- China
- Prior art keywords
- titanium dioxide
- metatitanic acid
- slurry
- reducing agent
- formaldehyde
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 112
- 239000002253 acid Substances 0.000 title claims abstract description 56
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 239000002002 slurry Substances 0.000 title claims abstract description 50
- 239000004408 titanium dioxide Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 40
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 30
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 29
- 238000005406 washing Methods 0.000 claims abstract description 17
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910001447 ferric ion Inorganic materials 0.000 claims abstract description 11
- XWGJFPHUCFXLBL-UHFFFAOYSA-M rongalite Chemical compound [Na+].OCS([O-])=O XWGJFPHUCFXLBL-UHFFFAOYSA-M 0.000 claims abstract description 11
- SXOZXLUKVXWUGL-UHFFFAOYSA-M sodium;formaldehyde;hydrogen sulfate Chemical compound [Na+].O=C.OS([O-])(=O)=O SXOZXLUKVXWUGL-UHFFFAOYSA-M 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 10
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910001448 ferrous ion Inorganic materials 0.000 claims abstract description 7
- 230000003647 oxidation Effects 0.000 claims abstract description 5
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 5
- 239000007787 solid Substances 0.000 claims abstract description 5
- 235000010215 titanium dioxide Nutrition 0.000 claims description 55
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 18
- 238000011033 desalting Methods 0.000 claims description 12
- 238000004061 bleaching Methods 0.000 claims description 6
- -1 iron ions Chemical class 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000002244 precipitate Substances 0.000 claims description 3
- 239000011593 sulfur Substances 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 230000018044 dehydration Effects 0.000 claims 1
- 238000006297 dehydration reaction Methods 0.000 claims 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 abstract description 10
- 239000010936 titanium Substances 0.000 abstract description 10
- 229910052719 titanium Inorganic materials 0.000 abstract description 10
- 150000003839 salts Chemical class 0.000 abstract description 5
- 238000010612 desalination reaction Methods 0.000 abstract description 3
- 238000004090 dissolution Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- 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
-
- 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
Landscapes
- 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)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention discloses a reduction removal process for removing high-valence iron in titanium dioxide slurry of metatitanic acid by using a reducing agent, which is characterized by comprising the following steps of: the invention mainly adopts the method that reducing agents such as sodium bisulfate formaldehyde or formaldehyde sodium sulfoxylate and the like are added into the metatitanic acid titanium dioxide slurry to reduce insoluble solid ferric ions after oxidation into free ferrous ions, thereby realizing the removal of the ferric ions in the metatitanic acid titanium dioxide slurry. The reduction removal process for removing the high-valence iron in the titanium dioxide metatitanic acid slurry by the reducing agent is scientific and reasonable in design, simple in process structure and small in using amount of the reducing agent. The removal rate of the high-valence ferric ion insoluble salt in the titanium metatitanic acid titanium dioxide slurry is high, and the problems that the impurity removal process in the titanium metatitanic acid titanium dioxide slurry in the prior art mainly adopts a washing dissolution desalination process and can not remove the insoluble ferric salt impurities are reasonably and effectively solved. The defects of the prior art are overcome.
Description
Technical Field
The invention relates to the technical field of titanium dioxide, in particular to a reduction removal process for removing high-valence iron in metatitanic acid titanium dioxide slurry by using a reducing agent.
Background
The reduction removal process of high-valence iron in metatitanic acid titanium dioxide slurry in the prior art mainly adopts a water washing, dissolving and desalting process, and ferric ions cannot be dissolved and enter desalting, washing and dewatering, and cannot be eluted by desalting and eluting water, so that high-valence iron impurities in titanium dioxide cannot be removed.
Disclosure of Invention
The invention aims to provide a reduction removal process for removing high-valence iron in titanium dioxide metatitanic acid slurry by using a reducing agent, which reasonably and effectively solves the problems that the impurity removal process in titanium dioxide metatitanic acid slurry in the prior art mainly adopts a washing dissolution desalination process and can not remove insoluble ferric salt impurities.
The following technical scheme is adopted:
a kind ofThe reducing and removing process for removing the high-valence iron in the metatitanic acid titanium dioxide slurry by using the reducing agent is characterized by comprising the following steps of: the reduction removal process for removing high-valence iron in titanium metatitanic acid titanium dioxide slurry by using a reducing agent is characterized in that in the washing process of the titanium white production process, when the titanium white is in the state of titanium metatitanic acid titanium white slurry, free ferrous ions in the titanium metatitanic acid titanium dioxide slurry are oxidized into trivalent precipitates, in the washing, dissolving and desalting process, the trivalent iron ions cannot be dissolved, enter desalting, washing and dewatering, cannot be eluted by the desalting water, and cannot remove iron impurities in the titanium white, a reducing agent such as sodium bisulfate formaldehyde or sodium formaldehyde sulfoxylate is added into the titanium metatitanic acid slurry, wherein the molecular formula is NaHS02·CH20·2H20, reducing insoluble solid ferric ions after oxidation into free ferrous ions, thereby realizing the method for removing the ferric ions in the metatitanic acid titanium dioxide slurry.
Further, the process flow of the reduction removal process for removing the high-valence iron in the metatitanic acid titanium dioxide slurry by using the reducing agent comprises the following steps:
step one, throwing a washed metatitanic acid titanium dioxide slurry into a bleaching tank with stirring, wherein the concentration of metatitanic acid is controlled to be 280-320 g/L, and the temperature is controlled to be 50-60 ℃;
step two, measuring the concentration of sulfuric acid in the titanium dioxide metatitanic acid slurry, and supplementing the sulfuric acid when the sulfuric acid degree is insufficient, so that the sulfur acid content in the liquid is controlled to be 10-50 g/L;
adding reducing agents such as sodium bisulfate formaldehyde or sodium formaldehyde sulfoxylate and the like, wherein the adding amount of the sodium bisulfate formaldehyde or the sodium formaldehyde sulfoxylate is 1 per mill-2 per mill of the mass of the titanium dioxide in the titanium white metatitanic acid slurry;
and step four, stirring for 1 hour, completing bleaching, and sending to the next procedure for washing.
The beneficial technical effects of the invention are as follows:
the invention aims to provide a reduction removal process for removing high-valence iron in titanium dioxide metatitanic acid slurry by using a reducing agent, which reasonably and effectively solves the problems that the impurity removal process in titanium dioxide metatitanic acid slurry in the prior art mainly adopts a washing dissolution desalination process and can not remove insoluble ferric salt impurities.
The invention mainly adopts the method that sodium bisulfate formaldehyde or formaldehyde sodium sulfoxylate and other reducing agents are added into the metatitanic acid titanium dioxide slurry, and the molecular formula is NaHS02·CH20·2H20, reducing insoluble solid ferric ions after oxidation into free ferrous ions, thereby realizing the method for removing the ferric ions in the metatitanic acid titanium dioxide slurry. The reduction removal process for removing the high-valence iron in the titanium dioxide metatitanic acid slurry by the reducing agent is scientific and reasonable in design, simple in process structure and small in using amount of the reducing agent. The clearance rate of high valence iron ion insoluble salt in the metatitanic acid titanium dioxide slurry is high, and the defects of the prior art are overcome.
Detailed Description
The invention will be better understood by the following description of embodiments thereof, but the applicant's specific embodiments are not intended to limit the invention to the particular embodiments shown, and any changes in the definition of parts or features and/or in the overall structure, not essential changes, are intended to define the scope of the invention.
Example (b):
a reducing and removing process for removing high-valence iron in titanium dioxide metatitanic acid slurry by using a reducing agent is characterized in that: the reduction removal process for removing high-valence iron in titanium metatitanic acid titanium dioxide slurry by using a reducing agent is characterized in that in the washing process of the titanium white production process, when the titanium white is in the state of titanium metatitanic acid titanium white slurry, free ferrous ions in the titanium metatitanic acid titanium dioxide slurry are oxidized into trivalent precipitates, in the washing, dissolving and desalting process, the trivalent iron ions cannot be dissolved, enter desalting, washing and dewatering, cannot be eluted by the desalting water, and cannot remove iron impurities in the titanium white, a reducing agent such as sodium bisulfate formaldehyde or sodium formaldehyde sulfoxylate is added into the titanium metatitanic acid slurry, wherein the molecular formula is NaHS02·CH20·2H20, reducing the insoluble solid ferric ion after oxidation to freeAnd (3) removing the high-valence iron ions in the metatitanic acid titanium dioxide slurry by using the state ferrous ions.
Further, the process flow of the reduction removal process for removing the high-valence iron in the metatitanic acid titanium dioxide slurry by using the reducing agent comprises the following steps:
step one, throwing a washed metatitanic acid titanium dioxide slurry into a bleaching tank with stirring, wherein the concentration of metatitanic acid is controlled to be 280-320 g/L, and the temperature is controlled to be 50-60 ℃;
step two, measuring the concentration of sulfuric acid in the titanium dioxide metatitanic acid slurry, and supplementing the sulfuric acid when the sulfuric acid degree is insufficient, so that the sulfur acid content in the liquid is controlled to be 10-50 g/L;
adding reducing agents such as sodium bisulfate formaldehyde or sodium formaldehyde sulfoxylate and the like, wherein the adding amount of the sodium bisulfate formaldehyde or the sodium formaldehyde sulfoxylate is 1 per mill-2 per mill of the mass of the titanium dioxide in the titanium white metatitanic acid slurry;
and step four, stirring for 1 hour, completing bleaching, and sending to the next procedure for washing. And finishing the implementation of the reduction removal process for removing the high-valence iron in the metatitanic acid titanium dioxide slurry by using the reducing agent.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it is therefore intended that all such changes and modifications as fall within the true spirit and scope of the invention be considered as within the following claims.
Claims (2)
1. A reducing and removing process for removing high-valence iron in titanium dioxide metatitanic acid slurry by using a reducing agent is characterized in that: the reduction removal process for removing high-valence iron in the metatitanic acid titanium dioxide slurry by using the reducing agent is characterized in that in the washing process of the titanium dioxide production process, when the titanium dioxide is in a metatitanic acid titanium dioxide slurry state, free divalent iron ions in the metatitanic acid titanium dioxide slurry are oxidized into trivalent precipitates, and in the washing, dissolving and desalting process, the trivalent iron ions cannot be dissolved, enter desalting and washing for dehydration and cannot be eluted by the desalting water, so that the titanium dioxide cannot be removedWhen the iron impurity is contained, reducing agents such as sodium bisulfate formaldehyde or formaldehyde sodium sulfoxylate are added into the titanium white metatitanic acid slurry, and the molecular formula is NaHS02·CH20·2H20, reducing insoluble solid ferric ions after oxidation into free ferrous ions, thereby realizing the method for removing the ferric ions in the metatitanic acid titanium dioxide slurry.
2. The reduction removal process for removing the high-valence iron in the titanium dioxide metatitanic acid slurry by using the reducing agent according to claim 1, wherein the process flow of the reduction removal process for removing the high-valence iron in the titanium dioxide metatitanic acid slurry by using the reducing agent comprises the following steps:
step one, throwing a washed metatitanic acid titanium dioxide slurry into a bleaching tank with stirring, wherein the concentration of metatitanic acid is controlled to be 280-320 g/L, and the temperature is controlled to be 50-60 ℃;
step two, measuring the concentration of sulfuric acid in the titanium dioxide metatitanic acid slurry, and supplementing the sulfuric acid when the sulfuric acid degree is insufficient, so that the sulfur acid content in the liquid is controlled to be 10-50 g/L;
adding reducing agents such as sodium bisulfate formaldehyde or sodium formaldehyde sulfoxylate and the like, wherein the adding amount of the sodium bisulfate formaldehyde or the sodium formaldehyde sulfoxylate is 1 per mill-2 per mill of the mass of the titanium dioxide in the titanium white metatitanic acid slurry;
and step four, stirring for 1 hour, completing bleaching, and sending to the next procedure for washing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011584013.XA CN114684852A (en) | 2020-12-28 | 2020-12-28 | Reduction removal process for removing high-valence iron in metatitanic acid titanium dioxide slurry by using reducing agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011584013.XA CN114684852A (en) | 2020-12-28 | 2020-12-28 | Reduction removal process for removing high-valence iron in metatitanic acid titanium dioxide slurry by using reducing agent |
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| Publication Number | Publication Date |
|---|---|
| CN114684852A true CN114684852A (en) | 2022-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011584013.XA Pending CN114684852A (en) | 2020-12-28 | 2020-12-28 | Reduction removal process for removing high-valence iron in metatitanic acid titanium dioxide slurry by using reducing agent |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT8222409A0 (en) * | 1981-07-24 | 1982-07-15 | Nl Industries Inc | METHOD FOR THE PURIFICATION OF TITANILE HYDRATE. |
| CN102815745A (en) * | 2012-09-05 | 2012-12-12 | 山东东佳集团股份有限公司 | Water washing process for producing titanium dioxide by using sulfuric acid method which uses ascorbic acid to remove high-valence iron |
| CN103318953A (en) * | 2013-06-28 | 2013-09-25 | 攀枝花创新佳科技有限责任公司 | Bleaching method of titanium dioxide |
| CN104477985A (en) * | 2014-12-04 | 2015-04-01 | 攀钢集团钛业有限责任公司 | Bleaching method used in production of titanium dioxide powder by sulfuric acid process |
| CN107055596A (en) * | 2017-05-27 | 2017-08-18 | 攀钢集团研究院有限公司 | A kind of method for removing iron in metatitanic acid slurry |
| CN109824084A (en) * | 2019-04-15 | 2019-05-31 | 四川科尔瑞环保科技有限责任公司 | A kind of improved method of titanium dioxide bleaching |
| CN110683575A (en) * | 2019-08-05 | 2020-01-14 | 四川科尔瑞环保科技有限责任公司 | Improved method for bleaching metatitanic acid slurry and metatitanic acid |
-
2020
- 2020-12-28 CN CN202011584013.XA patent/CN114684852A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT8222409A0 (en) * | 1981-07-24 | 1982-07-15 | Nl Industries Inc | METHOD FOR THE PURIFICATION OF TITANILE HYDRATE. |
| CN102815745A (en) * | 2012-09-05 | 2012-12-12 | 山东东佳集团股份有限公司 | Water washing process for producing titanium dioxide by using sulfuric acid method which uses ascorbic acid to remove high-valence iron |
| CN103318953A (en) * | 2013-06-28 | 2013-09-25 | 攀枝花创新佳科技有限责任公司 | Bleaching method of titanium dioxide |
| CN104477985A (en) * | 2014-12-04 | 2015-04-01 | 攀钢集团钛业有限责任公司 | Bleaching method used in production of titanium dioxide powder by sulfuric acid process |
| CN107055596A (en) * | 2017-05-27 | 2017-08-18 | 攀钢集团研究院有限公司 | A kind of method for removing iron in metatitanic acid slurry |
| CN109824084A (en) * | 2019-04-15 | 2019-05-31 | 四川科尔瑞环保科技有限责任公司 | A kind of improved method of titanium dioxide bleaching |
| CN110683575A (en) * | 2019-08-05 | 2020-01-14 | 四川科尔瑞环保科技有限责任公司 | Improved method for bleaching metatitanic acid slurry and metatitanic acid |
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