CN100528743C - Process for preparing high purity phosphoric acid-ammonium by titanium dioxide waste acid - Google Patents
Process for preparing high purity phosphoric acid-ammonium by titanium dioxide waste acid Download PDFInfo
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- CN100528743C CN100528743C CN200510121279.XA CN200510121279A CN100528743C CN 100528743 C CN100528743 C CN 100528743C CN 200510121279 A CN200510121279 A CN 200510121279A CN 100528743 C CN100528743 C CN 100528743C
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- acid
- phosphoric acid
- ammonium
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- sulfuric acid
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- 239000002253 acid Substances 0.000 title claims abstract description 34
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 33
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 239000004408 titanium dioxide Substances 0.000 title claims description 13
- 238000004519 manufacturing process Methods 0.000 title abstract description 12
- 239000002699 waste material Substances 0.000 title description 7
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 72
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 50
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 36
- 238000006243 chemical reaction Methods 0.000 claims abstract description 18
- 239000000654 additive Substances 0.000 claims abstract description 11
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 claims abstract description 11
- 235000019837 monoammonium phosphate Nutrition 0.000 claims abstract description 11
- 239000006012 monoammonium phosphate Substances 0.000 claims abstract description 11
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000001704 evaporation Methods 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 6
- 235000003891 ferrous sulphate Nutrition 0.000 claims abstract description 6
- 239000011790 ferrous sulphate Substances 0.000 claims abstract description 6
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims abstract description 6
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims abstract description 6
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims abstract description 4
- 239000007787 solid Substances 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 25
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 18
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 18
- 239000006227 byproduct Substances 0.000 claims description 10
- 230000000996 additive effect Effects 0.000 claims description 9
- 229910021529 ammonia Inorganic materials 0.000 claims description 9
- 238000002425 crystallisation Methods 0.000 claims description 9
- 239000000047 product Substances 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 8
- 239000001117 sulphuric acid Substances 0.000 claims description 8
- 235000011149 sulphuric acid Nutrition 0.000 claims description 8
- 230000018044 dehydration Effects 0.000 claims description 7
- 238000006297 dehydration reaction Methods 0.000 claims description 7
- 230000008020 evaporation Effects 0.000 claims description 7
- 239000002367 phosphate rock Substances 0.000 claims description 7
- 238000004176 ammonification Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 238000000746 purification Methods 0.000 claims description 4
- 235000017550 sodium carbonate Nutrition 0.000 claims description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 4
- JJEJDZONIFQNHG-UHFFFAOYSA-N [C+4].N Chemical compound [C+4].N JJEJDZONIFQNHG-UHFFFAOYSA-N 0.000 claims description 3
- AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 claims description 3
- 238000006477 desulfuration reaction Methods 0.000 claims description 3
- 230000023556 desulfurization Effects 0.000 claims description 3
- 235000010215 titanium dioxide Nutrition 0.000 abstract description 18
- 239000000843 powder Substances 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract description 2
- 230000003009 desulfurizing effect Effects 0.000 abstract 1
- 238000007865 diluting Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- 235000011007 phosphoric acid Nutrition 0.000 description 32
- 239000000243 solution Substances 0.000 description 12
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 230000008025 crystallization Effects 0.000 description 5
- 239000012141 concentrate Substances 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 238000010790 dilution Methods 0.000 description 3
- 239000012895 dilution Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 150000003016 phosphoric acids Chemical class 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- YDZQQRWRVYGNER-UHFFFAOYSA-N iron;titanium;trihydrate Chemical compound O.O.O.[Ti].[Fe] YDZQQRWRVYGNER-UHFFFAOYSA-N 0.000 description 2
- 239000012452 mother liquor Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- QCJQWJKKTGJDCM-UHFFFAOYSA-N [P].[S] Chemical compound [P].[S] QCJQWJKKTGJDCM-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- OBSZRRSYVTXPNB-UHFFFAOYSA-N tetraphosphorus Chemical compound P12P3P1P32 OBSZRRSYVTXPNB-UHFFFAOYSA-N 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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- Inorganic Compounds Of Heavy Metals (AREA)
- Fertilizers (AREA)
Abstract
A process for preparing high-purity mono-ammonium phosphate from the used acid generated in preparing titanium white powder includes such steps as heating, concentrating, cooling, liquid-solid separation to obtain diluted sulfuric acid and ferrous sulfate, diluting said diluted sulfuric acid by water, adding P ore powder, reaction while adding desulfurizing, defluorinating and decoloring additives, filtering to obtain diluted phosphoric acid and phosphogypsum, ammoniation reaction of diluted phosphoric acid, filtering, evaporating, cooling while crystallizing, centrifugal dewatering, and drying.
Description
Technical field
The present invention relates to the comprehensive utilization technique of industrial waste acid, refer in particular to and utilize the titanium dioxide spent acid to produce the method for high-purity phosphoric acid one ammonium.
Background technology
Titanium dioxide is the basic material of coatings industry, in using the process of Titanium White Production By Sulfuric Acid Process, at first be ilmenite to be decomposed with sulfuric acid, make titanium and iron in the ore react the vitriol that generates solubility, then by hydrolysis, draw metatitanic acid and a part of concentration and be rare spent acid of about 20%, though wherein small portion can be with reusing behind the vitriol oil enrichment, major part still need be discharged.In general, every production 1t titanium dioxide needs the vitriol oil of 4t approximately, produces approximately after the reaction about rare spent acid 8t of 20%, though rare spent acid can concentrate the back and reuse, but needing increases facility investment and energy consumption, and under the not high situation of current sulfuric acid price, how uneconomical this method is economically; Therefore, present domestic most of titanium powder plant, particularly middle-size and small-size factory generally adopts lime neutralization to unnecessary spent acid or freely supplies the user even the expense of losing money instead of making money hands over other people to handle.In recent years, along with the increasingly stringent of China, also there is the part titanium powder plant to be forced to stop production because of the spent acid problem can't solve to environmental requirement.Chinese patent discloses " a kind of titanium dioxide by-product spent acid is used for the production method of phosphoric acid by wet process " (publication number CN1376635A, open day on October 30th, 2002).
Monoammonium phosphate has another name called primary ammonium phosphate (NH
4H
2PO
4), be a kind of phosphoric acid salt used for a long time, industrial main except that as the chemical fertilizer as fire retardant, fire-fighting medium, the highly purified aspects such as medicine, food that still are used for, national standard (GB10205-88) stipulates that its premium grads leading indicator is: available phosphorus is (with P
2O
5Meter) content 〉=52%, total ammonia (N) content 〉=11% is meant the chemical fertilizer requirement.Stipulate that to produce the famous French Rhone-Poulene Chimie standard (nineteen eighty-three) of phosphoric acid salt its leading indicator is: the P of technical grade in the world
2O
5The content that reaches N respectively is 60% and 11.8%, and purified grade respectively is 61% and 12% then, and the pH value of its 1% solution is 4.5, and outward appearance is a white crystals.In recent years, high-purity phosphoric acid one ammonium also a large amount of outlets except that sold inside the country that China produces with thermal phosphoric acid, the quality index of exported product is as follows:
Main content (NH
4H
2PO
4) 〉=99%
Vanadium Pentoxide in FLAKES (P
2O
5) 〉=61.00%
Nitrogen (N) 〉=12.00%
1% solution pH value 4.4～4.6
Fluorochemical (F)≤0.005%
Arsenic (As)≤0.005%
Heavy metal (in Pb)≤0.005%
Water-insoluble≤0.1%
Moisture content＜0.2%
The appearance white crystallization
Because of thermal phosphoric acid is raw material production with the electric furnace yellow phosphorus, in recent years owing to the raising of China's electricity price for industrial uses, restricted the output of thermal phosphoric acid, also influenced the production of high-purity phosphoric acid one ammonium.At this situation, a kind of phosphoric acid by wet process method of sulfuric acid decomposing phosphate rock that adopts is also succeeded in developing, can produce high-purity phosphoric acid one ammonium of equal in quality and put (Wu Zixiong on market, produce the industrial equipments [J] of high-purity phosphoric acid one ammonium, design of sulphur phosphorus and powder technology, 2005, (2) 7～9).Under the promotion of green technology progress at home and abroad and phosphorous chemical industry development situation, the present inventor is by the effort of for some time, finished the research that utilizes titanium white waste acid to produce high-purity phosphoric acid one ammonium, every performance index of product can reach the quality index of the exported product of producing with thermal phosphoric acid, with the inventor identical in quality with the identical product of commodity 98% phosphoric acid production in the laboratory.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, provide that a kind of production cost is low, good product quality, can effectively solve a kind of method of utilizing the titanium dioxide spent acid to produce high-purity phosphoric acid one ammonium of middle-size and small-size titanium powder plant spent acid comprehensive utilization.
The object of the present invention is achieved like this: a kind of method of utilizing the titanium dioxide spent acid to produce high-purity phosphoric acid one ammonium, comprise the steps: (1) with spent acid heating and be concentrated into sulfuric acid concentration greater than 50% postcooling carry out liquid-solid separate the dilute sulfuric acid solution and the byproduct ferrous sulfate of rough purification; (2) be that 20% back adds ground phosphate rock and reacts with dilute sulfuric acid solution thin up to the sulfuric acid concentration of step (1), add desulfurization, defluorinate and decoloring additive during reaction simultaneously, filter after having reacted P
2O
5Content is 13%～23% dilute phosphoric acid and byproduct phosphogypsum; (3) dilute phosphoric acid liquid is carried out behind the aminating reaction after filtration, after the evaporation, crystallisation by cooling, centrifuge dehydration, drying the major product monoammonium phosphate.
Above-mentionedly utilize that the sweetening additive in the step (2) is a barium carbonate in the method that titanium white waste acid produces high-purity phosphoric acid one ammonium, consumption is 0.2% of a dilute sulphuric acid weight.
Above-mentionedly utilize that the defluorinate additive in the step (2) is a soda ash in the method that titanium white waste acid produces high-purity phosphoric acid one ammonium, consumption is 0.3% of a dilute sulphuric acid weight.
Above-mentionedly utilize that the decoloring additive in the step (2) is an activated carbon in the method that titanium white waste acid produces high-purity phosphoric acid one ammonium, consumption is 0.1% of a dilute sulphuric acid weight.
Above-mentionedly utilize in the method that titanium white waste acid produces high-purity phosphoric acid one ammonium the ammonification ammonia source in the step (3) to adopt liquefied ammonia or carbon ammonium.
The present invention compared with prior art has following advantage:
(1) solved present domestic titanium powder plant spent acid problem of environment pollution caused, for the comprehensive utilization of spent acid provides an economically feasible new way.
(2) high-purity phosphoric acid one ammonium steady quality, the cost that utilizes spent acid to produce is low, than low 1000 yuan/ton approximately of high-purity phosphoric acid one ammoniums that adopts the production equipment of the equal scale of phosphoric acid by wet process to produce by existing market value calculating, and can enjoy country's tax reduction and exemption policy of utilizing the three wastes, so factory has remarkable economic efficiency.
(3) domestic middle-size and small-size titanium powder plant of being forced to stop production because of environmental pollution is come back to life, have the significant social comprehensive benefit.
Description of drawings
Below in conjunction with drawings and Examples the present invention is described in further detail, but does not constitute any limitation of the invention.
Fig. 1 is a process flow diagram of the present invention.
Embodiment
Consult shown in Figure 1ly, the method for utilizing the titanium dioxide spent acid to produce high-purity phosphoric acid one ammonium of the present invention comprises the steps: that spent acid concentrates → dilution → extractive reaction → filtration → ammonification → filtration → evaporation → crystallization → dehydration → drying.Details are as follows to each operation below:
1. spent acid concentrates:, big because of titanium dioxide acid to the solubleness of impurity because concentration is low, wherein except that containing a large amount of iron, sulphur, also contain other impurity in ilmenite and the sulfuric acid, and before being used for decomposing phosphate rock, it must be purified.Can adopt and spent acid heating is concentrated into its concentration makes it to isolate a large amount of ferrous sulfate (FeSO more than 50%
47H
2O), after filtration, draw the dilute sulphuric acid of rough purification.
2. dilution: in order to improve the rate of decomposition of sulfuric acid to phosphorus ore, with remove substantially ferrous sulfate～50% sulfuric acid reacts with ground phosphate rock after the concentration of thin up to 20% again.
3. extractive reaction: in the dilute sulphuric acid after dilution, add ground phosphate rock and carry out extractive reaction, and when reaction, add additives such as desulfurization, defluorinate and decolouring simultaneously to remove the various impurity in titanium dioxide spent acid and the phosphorus ore, additive adopts barium carbonate, soda ash and activated carbon, and consumption is respectively 0.2%, 0.3% and 0.1% of diluted acid weight.
4. filter: after reaction is finished, reacting liquid filtering is obtained being fit to get P with ammonia react
2O
5Content is 13%～23% dilute phosphoric acid and byproduct phosphogypsum.
5. ammonification: dilute phosphoric acid and ammonia after will purifying react, and liquefied ammonia or carbon ammonium can be adopted in the ammonia source; The process of phosphoric acid ammonification also is the process that its product is further purified, when ammonification when the pH value of solution reaches 4.5, most of Fe, Al, Mg, Si and F etc. all with solution in NH
4 +Ion and H
2PO
4 -Or other composition is combined into water-insoluble compound and precipitate and separate.
6. filter: after aminating reaction is finished reaction solution is obtained monoammonium phosphate solution mother liquor and the general calcium of byproduct through the vacuum decompression filtration.
7. evaporation: with monoammonium phosphate solution mother liquor heating evaporation.
8. crystallization: the monoammonium phosphate solution crystallisation by cooling after the evaporation concentration is obtained the monoammonium phosphate crystallization.
9. dehydration: the whizzer centrifuge dehydration is put in the monoammonium phosphate crystallization.
10. dry: as the monoammonium phosphate after the centrifuge dehydration to be carried out drying treatment, promptly obtain major product monoammonium phosphate white crystals.
Embodiment 1
Employing contains 17 tons in 20% vitriolic titanium dioxide spent acid, puts into the reactor heating internal heating and concentrates, and is concentrated into sulfuric acid content and reaches at 55% o'clock and stop heating, is cooled to 30 ℃ of after-filtration of normal temperature, about 6 tons of the sulfuric acid liquid of rough purification, about 3.5 tons of byproduct ferrous sulfate; After its separation, thin up in sulfuric acid liquid makes sulfuric acid concentration reduce to 20% more then, adds ground phosphate rock and (contains P
2O
530%) 3 tons are reacted, and add about 0.1 ton altogether of barium carbonate, soda ash and activated carbon simultaneously, react 1.5 hours, filter then and obtain P
2O
5Content is 5 tons of 4.7 tons of 13% dilute phosphoric acids and byproduct phosphogypsums; In dilute phosphoric acid, feed 0.17 ton of NH
3Carry out aminating reaction, reaching 4.4～4.6 to pH value is stopped reaction, filters, and obtains about 2.4 tons of reaction solution, and the general calcium of byproduct (contains P for about 2.4 tons
2O
512%), about 1 ton of high-purity phosphoric acid one ammonium will be obtained after reaction solution heating evaporation, crystallisation by cooling, centrifuge dehydration, the drying; Quality meets export standard after testing.
Claims (5)
1. method of utilizing the titanium dioxide spent acid to produce high-purity phosphoric acid one ammonium, it is characterized in that comprising the steps: (1) with the spent acid heating and be concentrated into sulfuric acid concentration greater than 50% postcooling carry out liquid-solid separate the dilute sulfuric acid solution and the byproduct ferrous sulfate of rough purification; (2) be that 20% back adds ground phosphate rock and reacts with dilute sulfuric acid solution thin up to the sulfuric acid concentration of step (1), add desulfurization, defluorinate and decoloring additive during reaction simultaneously, filter to such an extent that contain P after having reacted
2O
5Content is 13%～23% dilute phosphoric acid and byproduct phosphogypsum; (3) dilute phosphoric acid liquid is carried out behind the aminating reaction after filtration, after the evaporation, crystallisation by cooling, centrifuge dehydration, drying the major product monoammonium phosphate.
2. method according to claim 1 is characterized in that the sweetening additive in the step (2) is a barium carbonate, and consumption is 0.2% of a dilute sulphuric acid weight.
3. method according to claim 1 is characterized in that the defluorinate additive in the step (2) is a soda ash, and consumption is 0.3% of a dilute sulphuric acid weight.
4. method according to claim 1 is characterized in that the decoloring additive in the step (2) is an activated carbon, and consumption is 0.1% of a dilute sulphuric acid weight.
5. method according to claim 1 is characterized in that liquefied ammonia or carbon ammonium are adopted in the ammonification ammonia source in the step (3).
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|---|---|---|---|
| CN200510121279.XA CN100528743C (en) | 2005-12-29 | 2005-12-29 | Process for preparing high purity phosphoric acid-ammonium by titanium dioxide waste acid |
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| CN100528743C true CN100528743C (en) | 2009-08-19 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101654235B (en) * | 2009-09-19 | 2011-01-19 | 宜昌瑞特精细化工有限公司 | Method for producing food grade monoammonium phosphate by using agricultural monoammonium phosphate |
| CN101759166B (en) * | 2009-12-31 | 2011-06-29 | 四川龙蟒钛业股份有限公司 | Method for pre-treating phosphorite by using acidic waste water in the production process of titanium pigment |
| CN102515114B (en) * | 2011-11-13 | 2016-08-31 | 山东鲁北企业集团总公司 | A kind of method that titanium white waste acid high level efficiently utilizes |
| CN102674277B (en) * | 2012-05-25 | 2014-07-09 | 四川龙蟒钛业股份有限公司 | Method for pre-treating phosphorus rock by mixture of titanium dioxide waste acid and fluorine-containing waste water |
| CN104649241B (en) * | 2015-01-23 | 2017-01-25 | 湖北宜化肥业有限公司 | Method for producing monoammonium phosphate by utilizing medium and low grade phosphorus ore |
| CN109019545A (en) * | 2018-09-11 | 2018-12-18 | 湖北省黄麦岭磷化工有限责任公司 | A kind of technique of phosphoric acid,diluted demetalization ion |
-
2005
- 2005-12-29 CN CN200510121279.XA patent/CN100528743C/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| 用湿法磷酸制纯磷酸一铵. 王国平等.四川大学学报，第32卷第3期. 2000 * |
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