CN102825058B - Method for recycling calcium sulfate waste residues generated in titanium dioxide acidic waste water - Google Patents
Method for recycling calcium sulfate waste residues generated in titanium dioxide acidic waste water Download PDFInfo
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- CN102825058B CN102825058B CN201210325336.6A CN201210325336A CN102825058B CN 102825058 B CN102825058 B CN 102825058B CN 201210325336 A CN201210325336 A CN 201210325336A CN 102825058 B CN102825058 B CN 102825058B
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- calcium sulfate
- waste residues
- calcium
- calcium carbonate
- waste
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- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 title claims abstract description 98
- 239000002699 waste material Substances 0.000 title claims abstract description 65
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000004408 titanium dioxide Substances 0.000 title claims abstract description 16
- 239000002351 wastewater Substances 0.000 title claims abstract description 15
- 238000004064 recycling Methods 0.000 title abstract description 5
- 230000002378 acidificating effect Effects 0.000 title abstract 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 77
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 39
- 239000002253 acid Substances 0.000 claims abstract description 36
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims abstract description 30
- 235000011130 ammonium sulphate Nutrition 0.000 claims abstract description 30
- 238000006243 chemical reaction Methods 0.000 claims abstract description 27
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 28
- 239000000706 filtrate Substances 0.000 claims description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 238000001556 precipitation Methods 0.000 claims description 6
- 230000008929 regeneration Effects 0.000 claims description 4
- 238000011069 regeneration method Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000011161 development Methods 0.000 abstract description 3
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 abstract 2
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 abstract 2
- 235000012538 ammonium bicarbonate Nutrition 0.000 abstract 2
- 239000001099 ammonium carbonate Substances 0.000 abstract 2
- 230000000694 effects Effects 0.000 abstract 1
- 239000007787 solid Substances 0.000 description 17
- 238000003756 stirring Methods 0.000 description 12
- 239000007788 liquid Substances 0.000 description 6
- 239000000376 reactant Substances 0.000 description 6
- 238000000926 separation method Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000001038 titanium pigment Substances 0.000 description 2
- HLLSOEKIMZEGFV-UHFFFAOYSA-N 4-(dibutylsulfamoyl)benzoic acid Chemical compound CCCCN(CCCC)S(=O)(=O)C1=CC=C(C(O)=O)C=C1 HLLSOEKIMZEGFV-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000000976 ink Substances 0.000 description 1
- YDZQQRWRVYGNER-UHFFFAOYSA-N iron;titanium;trihydrate Chemical compound O.O.O.[Ti].[Fe] YDZQQRWRVYGNER-UHFFFAOYSA-N 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- -1 papermaking Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- 235000014692 zinc oxide Nutrition 0.000 description 1
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention belongs to the field of production of titanium dioxide, and particularly relates to a method for recycling calcium sulfate waste residues generated in titanium dioxide acidic waste water. According to the method, calcium sulfate waste residues are subjected to reaction with ammonium bicarbonate, so as to generate calcium carbonate and ammonium sulfate, wherein calcium carbonate can be reused to neutralize low-concentration waste acid, and the calcium sulfate waste residues obtained from the neutralization can be sequentially subjected to the reaction with ammonium bicarbonate to regenerate calcium carbonate and ammonium sulfate, therefore, a cycle is formed. According to the method provided by the invention, the calcium sulfate waste residues obtained from the neutralization deposit in a low-concentration acid water solution can be more thoroughly treated, and simultaneously, ammonium sulfate is prepared, therefore, the recycling of waste can be realized, the products with economic benefits are produced. The method disclosed by the invention has an excellent development prospect and a high value in application and popularization, and provides an ideal demonstration effect on the energy saving and consumption reduction promoted by the state.
Description
Technical field
The invention belongs to field of titanium dioxide production, be specifically related to the circulation utilization method of the calcium sulfate waste residues that a kind of titanium dioxide acid waste water produces.
Background technology
Titanium dioxide is considered to a kind of Chinese white that performance is best in the world at present, and be also a kind of important raw material in chemical engineering industry, its range of application is very wide.Titanium dioxide can as pigment and applying filler in coating, plastics, ink, papermaking, rubber, pottery etc., and also at chemical fibre, electronics, the aspects such as food and medicine use as additive.
The ripe production technology of industry of current titanium dioxide has sulfuric acid process and chloridising.Production By Sulfuric Acid Process mature technology, can produce anatase titanium dioxide and rutile-type two kinds of titanium dioxide products, and advantage is can with the low ilmenite that is easy to get of valency and sulfuric acid for raw material, and technology maturation, equipment is simple, and anticorrosive easily solves.Its shortcoming is that technological process is long, and sulfuric acid, water consumption are high, refuse and accessory substance many, big for environment pollution.Chloridising can only produce rutile-type product.Advantage is that flow process is short, and production capacity easily expands, and energy consumption is relatively low, and " three wastes " are few, can obtain quality product.Its shortcoming is that investment is large, and device structure is complicated, high to material requirements, and research and development difficulty is large.From referring now to, Production By Sulfuric Acid Process technique still occupies absolute status in China.So, optimize sulfuric acid method titanium pigment production technology and energy-saving and cost-reducing be still the emphasis of a research in period from now on.
Sulfate process titanium dioxide production can produce a large amount of spent acid (with H
2sO
4metering, is about 20wt.%) and the acid waste water of low concentration, wherein spent acid is mainly from during washing suction filtration hydrolysis metatitanic acid slurries and washing initial stage, washes later stage 5%(with H
2sO
4metering) following spent acid is with the discharge of low concentration acid waste water form, and other low concentration acid waste water is from washing, bleaching and post processing water-washing process, and discharge capacity has 60-80t/tTiO
2, other be cooling water and rinse bath tank time intermittent discharge waste water, be still low concentration acid waste water after the waste water of whole Producing Titanium Dioxide discharge converges, directly can not discharge, neutral could discharge must be neutralized into alkaline matter.Acid waste water generally selects lime stone or carbide slurry to neutralize, but understands the calcium sulfate waste residues of a large amount of iron content of corresponding generation, and these waste residues carry out buried a bit, some direct air storage, through rain drop erosion, the water of outflow also can cause very large destruction to environment, so must process.
Summary of the invention
The object of this invention is to provide the circulation utilization method of the calcium sulfate waste residues that a kind of titanium dioxide acid waste water produces, solve the problem of the calcium sulfate waste residues of the iron content that low-concentration waste acid neutralization precipitation obtains, achieve the comprehensive utilization to calcium sulfate waste residues, reach the requirement of energy-conserving and environment-protective.
The circulation utilization method of the calcium sulfate waste residues that titanium dioxide acid waste water of the present invention produces, comprise the calcium sulfate waste residues obtaining iron content with low-concentration waste acid neutralization precipitation, by calcium sulfate waste residues and carbonic hydroammonium reaction, generate calcium carbonate and ammonium sulfate, during calcium carbonate can be used further to and low-concentration waste acid, the calcium sulfate waste residues obtained can continue to react with carbonic hydroammonium, and regeneration calcium carbonate and ammonium sulfate form a circulation.
Described calcium sulfate waste residues and rear filtration of carbonic hydroammonium reaction obtain filtrate and filtrate, and filtrate is calcium carbonate, and filtrate dilute sulfuric acid adjust ph is that 6.5-7.5,100-110 DEG C of oven dry obtains ammonium sulfate.
The pH value of described calcium sulfate waste residues and carbonic hydroammonium reaction is 8-9, mixing speed is 100-450r/min, the reaction time is 1.5-4h.
The present invention adopts the calcium sulfate waste residues of iron content and the reaction of agricultural carbonic hydroammonium, and generate calcium carbonate and ammonium sulfate, concrete reaction equation is as follows:
2NH
4HCO
3+CaSO
4→(NH
4)
2SO
4+H
2O+CaCO
3+CO
2
CaCO
3+H
2SO
4→CaSO
4+CO
2+H
2O
Regulate PH with ammoniacal liquor in course of reaction, reaction terminates rear Separation of Solid and Liquid, obtains calcium carbonate.The regeneration calcium carbonate be obtained by reacting is obtained by reacting calcium sulfate with low-concentration waste acid again, and calcium sulfate again turns back in technique and recycles.Filtrate is evaporated after adjusting PH with sulfuric acid, and concentrated, crystallization obtains ammonium sulfate.Concrete steps are as follows:
Take 150-1500g calcium sulfate waste residues, design (NH
4)
2sO
4concentration is 20-35%, adds after a certain amount of water stirs and adds a certain amount of carbonic hydroammonium, and carbonic hydroammonium addition is 0.9-1.15 times of theoretical amount, at room temperature, stir with 100-450r/min, regulate PH to the 8-9 of reactant with the ammoniacal liquor of 1:1, reaction 1.5-4h.
After reaction terminates, filter.Filtrate is the solution of ammonium sulfate, and filtrate composition is calcium carbonate.Regulate filtrate PH to be 6.5-7.5, obtain the solid of ammonium sulfate through condensing crystallizing.The regeneration calcium carbonate be obtained by reacting and low-concentration waste acid are obtained by reacting calcium sulfate, and calcium sulfate again turns back in technique and recycles.
The present invention be by the low concentration sour water that produces in production process of titanium pigment and after, the calcium sulfate produced is recycled and the production method of producing ammonium sulfate byproduct.Low-concentration waste acid neutralization precipitation obtains the calcium sulfate waste residues of iron content, by calcium sulfate waste residues and carbonic hydroammonium reaction, generate calcium carbonate and ammonium sulfate, calcium carbonate can again in and low-concentration waste acid, the calcium sulfate waste residues obtained can continue to react with carbonic hydroammonium, forms the circulation that repeatedly utilizes calcium carbonate.Reduce calcium carbonate consumption of raw materials, fecund has gone out ammonium sulfate again.
The present invention compared with prior art has following beneficial effect:
The present invention administers the calcium sulfate waste residues that low concentration sour water neutralization precipitation obtains more thoroughly, prepared ammonium sulfate simultaneously, both recycling of discarded object had been achieved, also produce the product with economic benefit simultaneously, there is good development prospect and application and popularization value, to the energy-saving and cost-reducing of country's promotion, there is good exemplary role.
Accompanying drawing explanation
Fig. 1 is present invention process schematic flow sheet.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1
Take 174.8g calcium sulfate waste residues, (NH
4)
2sO
4concentration is designed to 35%, adds after water stirs and adds 193g carbonic hydroammonium, at room temperature, stirs with 200r/min, and the ammoniacal liquor with 5ml1: 1 regulates the PH of reactant to 8.2, reaction 2h.Through Separation of Solid and Liquid after reaction, obtain calcium carbonate solid and ammonium sulfate.Calcium carbonate solid is 110 DEG C of oven dry, and measuring purity is 95.72%, and dry at 105 DEG C after filtrate is transferred to neutrality with dilute sulfuric acid and obtain ammonium sulfate, surveying its purity is 98.82%.During the calcium carbonate obtained can be used further to and low-concentration waste acid, the calcium sulfate waste residues obtained can continue to react with carbonic hydroammonium, forms a circulation.
Embodiment 2
Take 1000g calcium sulfate waste residues, (NH
4)
2sO
4concentration is designed to 35%, adds after water stirs and adds 1100g carbonic hydroammonium, at room temperature, stirs with 260r/min, regulates the PH of reactant to 8.8 with the ammoniacal liquor of 142ml 1:1, reaction 2h.Through Separation of Solid and Liquid after reaction, obtain calcium carbonate solid and ammonium sulfate.Calcium carbonate solid is 110 DEG C of oven dry, and measuring purity is 94.89%, and dry at 105 DEG C after filtrate is transferred to neutrality with dilute sulfuric acid and obtain ammonium sulfate, surveying its purity is 99.03%.During the calcium carbonate obtained can be used further to and low-concentration waste acid, the calcium sulfate waste residues obtained can continue to react with carbonic hydroammonium, forms a circulation.
Embodiment 3
Take 500g calcium sulfate waste residues, (NH
4)
2sO
4concentration is designed to 35%, adds after water stirs and adds 550g carbonic hydroammonium, at room temperature, stirs with 280r/min rotating speed, regulates the PH of reactant to 8.2 with the ammoniacal liquor of 122ml 1:1, reaction 3h.Through Separation of Solid and Liquid after reaction, obtain calcium carbonate solid and ammonium sulfate.Calcium carbonate solid is 110 DEG C of oven dry, and measuring purity is 93.84%, and dry at 105 DEG C after filtrate is transferred to neutrality with dilute sulfuric acid and obtain ammonium sulfate, surveying its purity is 99.24%.During the calcium carbonate obtained can be used further to and low-concentration waste acid, the calcium sulfate waste residues obtained can continue to react with carbonic hydroammonium, forms a circulation.
Embodiment 4
Take 800g calcium sulfate waste residues, (NH
4)
2sO
4concentration is designed to 35%, adds after water stirs and adds 850g carbonic hydroammonium, at room temperature, stirs with 320r/min rotating speed, regulates the PH of reactant to 8.5 with the ammoniacal liquor of 170ml 1:1, reaction 1.8h.Through Separation of Solid and Liquid after reaction, obtain calcium carbonate solid and ammonium sulfate.Calcium carbonate solid is 110 DEG C of oven dry, and measuring purity is 92.64%, and dry at 105 DEG C after filtrate is transferred to neutrality with dilute sulfuric acid and obtain ammonium sulfate, surveying its purity is 98.94%.During the calcium carbonate obtained can be used further to and low-concentration waste acid, the calcium sulfate waste residues obtained can continue to react with carbonic hydroammonium, forms a circulation.
Embodiment 5
Take 1500g calcium sulfate waste residues, (NH
4)
2sO
4concentration is designed to 35%, adds after water stirs and adds 1650g carbonic hydroammonium, at room temperature, stirs with 420 (r/min) rotating speed, regulates the PH of reactant to 8.3 with the ammoniacal liquor of 230ml 1:1, reaction 4h.Through Separation of Solid and Liquid after reaction, obtain calcium carbonate solid and ammonium sulfate.Calcium carbonate solid is 110 DEG C of oven dry, and measuring purity is 93.31%, and dry at 105 DEG C after filtrate is transferred to neutrality with dilute sulfuric acid and obtain ammonium sulfate, surveying its purity is 99.04%.During the calcium carbonate obtained can be used further to and low-concentration waste acid, the calcium sulfate waste residues obtained can continue to react with carbonic hydroammonium, forms a circulation.
Manufacture process evaluation is in table 1, table 2:
The consumption table of table 1 unit ammonium sulfate
Note: all from countercurrent washing water
Table 2 1t Calcium Carbonate Cyclic uses the material consumption after 8 times and output situation
Show in table 1 and table 2, in spent acid, the removal amount of diluted acid, 20% spent acid, waste residue (butt) is large, and the ammonium sulfate of formation can utilize again.The calcium sulfate waste residues of the iron content that low-concentration waste acid neutralization precipitation obtains by the present invention and carbonic hydroammonium reaction, generate calcium carbonate and ammonium sulfate, calcium carbonate can again in and low-concentration waste acid, the calcium sulfate waste residues obtained can continue to react with carbonic hydroammonium, formed circulation.Reduce calcium carbonate consumption of raw materials, fecund has gone out ammonium sulfate again.Both achieved recycling of discarded object, also produced the product with economic benefit simultaneously, there is good development prospect and application and popularization value, to the energy-saving and cost-reducing of country's promotion, there is good exemplary role.
Claims (1)
1. the circulation utilization method of the calcium sulfate waste residues of a titanium dioxide acid waste water generation, comprise the calcium sulfate waste residues obtaining iron content with low-concentration waste acid neutralization precipitation, it is characterized in that, by calcium sulfate waste residues and carbonic hydroammonium reaction, generate calcium carbonate and ammonium sulfate, during calcium carbonate is used further to and low-concentration waste acid, the calcium sulfate waste residues obtained continues to react with carbonic hydroammonium, regeneration calcium carbonate and ammonium sulfate, form a circulation;
Described calcium sulfate waste residues and rear filtration of carbonic hydroammonium reaction obtain filtrate and filtrate, and filtrate is calcium carbonate, and filtrate dilute sulfuric acid adjust ph is that 6.5-7.5,100-110 DEG C of oven dry obtains ammonium sulfate;
The circulation utilization method of the calcium sulfate waste residues that described titanium dioxide acid waste water produces, calcium sulfate waste residues and carbonic hydroammonium reaction time are 1.5-4h;
Calcium sulfate waste residues and carbonic hydroammonium pH value in reaction are 8-9, adopt ammoniacal liquor adjust ph;
Mixing speed when calcium sulfate waste residues and carbonic hydroammonium reaction is 100-450r/min.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210325336.6A CN102825058B (en) | 2012-09-05 | 2012-09-05 | Method for recycling calcium sulfate waste residues generated in titanium dioxide acidic waste water |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210325336.6A CN102825058B (en) | 2012-09-05 | 2012-09-05 | Method for recycling calcium sulfate waste residues generated in titanium dioxide acidic waste water |
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| Publication Number | Publication Date |
|---|---|
| CN102825058A CN102825058A (en) | 2012-12-19 |
| CN102825058B true CN102825058B (en) | 2015-01-21 |
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| CN201210325336.6A Expired - Fee Related CN102825058B (en) | 2012-09-05 | 2012-09-05 | Method for recycling calcium sulfate waste residues generated in titanium dioxide acidic waste water |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103435085A (en) * | 2013-07-31 | 2013-12-11 | 荣殿相 | Method for producing fine calcium chloride with NP waste residues |
| CN103433270A (en) * | 2013-08-30 | 2013-12-11 | 李戈登 | Comprehensive recycling method for solid waste water-quenched slag |
| CN103495587B (en) * | 2013-09-22 | 2015-06-10 | 清华大学 | Method for covering surface of gypsum type material with calcium carbonate |
| JP2023509228A (en) * | 2020-11-20 | 2023-03-07 | 成都千砺金科技創新有限公司 | Complete resource recycling method for wastewater from sulfuric acid titanium white production |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3653872A (en) * | 1968-12-18 | 1972-04-04 | Badger Nv | Process for the preparation of a nitrophosphate fertilizer |
| CN102275970A (en) * | 2011-05-20 | 2011-12-14 | 攀枝花市微创科技开发有限公司 | Comprehensive utilization method of titanium white waste acid and wastewater |
| CN101503203B (en) * | 2009-03-17 | 2011-12-28 | 杨绍泉 | Method for decomposing ammonia sulfate and method for reclaiming sulfuric acid from waste acid and acid wastewater |
| CN102557077A (en) * | 2011-12-22 | 2012-07-11 | 河南金丹乳酸科技股份有限公司 | Method for producing ammonium sulfate by using calcium sulfate waste residues produced in lactic acid production |
| CN102556981A (en) * | 2010-12-24 | 2012-07-11 | 漯河市兴茂钛业有限公司 | Comprehensive utilization method for solid wastes and waste acid in production process of titanium dioxide |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010109492A1 (en) * | 2009-03-27 | 2010-09-30 | Counsil Of Scientific & Industrial Research | Process for simultaneous production of potassium sulphate, ammonium sulfate, magnesium hydroxide and/or magnesium oxide from kainite mixed salt and ammonia |
-
2012
- 2012-09-05 CN CN201210325336.6A patent/CN102825058B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3653872A (en) * | 1968-12-18 | 1972-04-04 | Badger Nv | Process for the preparation of a nitrophosphate fertilizer |
| CN101503203B (en) * | 2009-03-17 | 2011-12-28 | 杨绍泉 | Method for decomposing ammonia sulfate and method for reclaiming sulfuric acid from waste acid and acid wastewater |
| CN102556981A (en) * | 2010-12-24 | 2012-07-11 | 漯河市兴茂钛业有限公司 | Comprehensive utilization method for solid wastes and waste acid in production process of titanium dioxide |
| CN102275970A (en) * | 2011-05-20 | 2011-12-14 | 攀枝花市微创科技开发有限公司 | Comprehensive utilization method of titanium white waste acid and wastewater |
| CN102557077A (en) * | 2011-12-22 | 2012-07-11 | 河南金丹乳酸科技股份有限公司 | Method for producing ammonium sulfate by using calcium sulfate waste residues produced in lactic acid production |
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|---|---|
| CN102825058A (en) | 2012-12-19 |
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