CN1844009A - Method for preparing building gypsum powder with phosphogypsum - Google Patents
Method for preparing building gypsum powder with phosphogypsum Download PDFInfo
- Publication number
- CN1844009A CN1844009A CN 200610043618 CN200610043618A CN1844009A CN 1844009 A CN1844009 A CN 1844009A CN 200610043618 CN200610043618 CN 200610043618 CN 200610043618 A CN200610043618 A CN 200610043618A CN 1844009 A CN1844009 A CN 1844009A
- Authority
- CN
- China
- Prior art keywords
- phosphogypsum
- carbonate stone
- stone powder
- hours
- carbonate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 title claims abstract description 58
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 23
- 239000010440 gypsum Substances 0.000 title claims abstract description 23
- 239000000843 powder Substances 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims description 24
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 32
- 239000004575 stone Substances 0.000 claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 238000010276 construction Methods 0.000 claims abstract 5
- 239000000463 material Substances 0.000 claims description 26
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 22
- 239000011574 phosphorus Substances 0.000 claims description 22
- 229910052698 phosphorus Inorganic materials 0.000 claims description 22
- 238000001354 calcination Methods 0.000 claims description 17
- 238000003756 stirring Methods 0.000 claims description 13
- 150000001875 compounds Chemical class 0.000 claims description 11
- 230000035484 reaction time Effects 0.000 claims description 2
- 239000011505 plaster Substances 0.000 claims 1
- 239000002131 composite material Substances 0.000 abstract 1
- 239000011507 gypsum plaster Substances 0.000 description 23
- 235000013312 flour Nutrition 0.000 description 22
- 239000000047 product Substances 0.000 description 20
- 238000007906 compression Methods 0.000 description 13
- 230000006835 compression Effects 0.000 description 13
- 239000002245 particle Substances 0.000 description 13
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 7
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 4
- 239000011575 calcium Substances 0.000 description 4
- 229910052791 calcium Inorganic materials 0.000 description 4
- 235000012255 calcium oxide Nutrition 0.000 description 4
- 239000000292 calcium oxide Substances 0.000 description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Inorganic materials [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 4
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 4
- 239000011737 fluorine Substances 0.000 description 4
- 229910052731 fluorine Inorganic materials 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 125000005587 carbonate group Chemical group 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000006386 neutralization reaction Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- QBTROWHSMGZXCV-RQURQNPSSA-N (6r,7r)-1-[(4s,5r)-4-acetyloxy-5-methyl-3-methylidene-6-phenylhexyl]-4,7-dihydroxy-6-(11-phenoxyundecoxy)-2,8-dioxabicyclo[3.2.1]octane-3,4,5-tricarboxylic acid Chemical compound C([C@@H](C)[C@H](OC(C)=O)C(=C)CCC12[C@@H]([C@@H](OCCCCCCCCCCCOC=3C=CC=CC=3)C(O1)(C(O)=O)C(O)(C(O2)C(O)=O)C(O)=O)O)C1=CC=CC=C1 QBTROWHSMGZXCV-RQURQNPSSA-N 0.000 description 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 229940125761 Compound 6g Drugs 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- JUNWLZAGQLJVLR-UHFFFAOYSA-J calcium diphosphate Chemical compound [Ca+2].[Ca+2].[O-]P([O-])(=O)OP([O-])([O-])=O JUNWLZAGQLJVLR-UHFFFAOYSA-J 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 229940043256 calcium pyrophosphate Drugs 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 235000019821 dicalcium diphosphate Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 230000002779 inactivation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention relates to a process for preparing construction gypsum by using phosphogypsum, which comprises the following steps: (1) charging carbonate stone powder or carbonate stone powder composite materials with a content of 1-80 wt% of phosphogypsum weight, disintegrating and mixing with phosphogypsum homogeneously, (2) subjecting the mixture in step (1) to constant temperature treatment in gypsum incineration apparatus for 3-12 hours at a temperature of 150-210 deg C.
Description
(1) technical field under
The invention discloses the method for preparing plaster of Paris, particularly a kind of method of utilizing phosphogypsum to prepare plaster of Paris.
(2) background technology
Can't directly utilize because of containing impurity such as a spot of phosphorus, fluorine, free acid in the phosphogypsum, and must pass through purifying treatment.Present known purifying treatment method is that WATER-WASHING METHOD, neutralisation and high temperature dodge the burning method.
WATER-WASHING METHOD is that phosphogypsum is washed 1～4 time with clear water, removes part free acid in the phosphogypsum, makes pH value rise to 4～5 by 2～3, and organic and inorganic phosphorus is reduced to below 1% by 1.6～2.5%, oven dry, granulation then, dehydration back production building gypsum plaster.Adopt WATER-WASHING METHOD need expend great lot of water resources, and caused secondary pollution.Simultaneously, the existence of moisture content makes that power consumption is bigger in this method production process.
Unslaked lime neutralisation, this method can be effectively in and the free acid in the phosphogypsum, the nature but the unslaked lime calcium oxide can not directly have drawn from needs make at 900 ℃ of following calcined limestones, power consumption is big.
High calcium ash neutralisation, this method are utilized the free CaO in the industrial residue high calcium ash, active SiO
2Deng with phosphogypsum in impurity such as solvable phosphorus reactions.But, be unfavorable for long-distance transport and standing storage, thereby this method has the region limitation because the active substance in the high calcium ash reacts rotten inactivation with airborne water, carbonic acid gas etc. easily.Activity substance content instability in the high calcium ash causes quality product wayward simultaneously.
It is that material passes through under the condition of high temperature in kiln rapidly that high temperature dodges burning method process characteristic, and the phosphogypsum dehydration generates semi-hydrated gypsum powder.Organophosphorus volatilization in the phosphogypsum, inorganic phosphorus becomes the Calcium Pyrophosphate inert substance, and double water gypsum product performance do not have deleterious effect, forms the beta-type semi-hydrated gypsum powder through quick cooling, realizes the transformation of phosphogypsum to plaster of Paris.Its shortcoming is the calcining temperature height, and energy expenditure is big.In addition, dodge in this technology and burn comparatively difficulty of temperature control, thereby unstable product quality, make the product application scope be restricted.
(3) summary of the invention
The purpose of this invention is to provide a kind of method of utilizing phosphogypsum to prepare building gypsum plaster, the raw material of this method is easy to get, and technology is simple, and the finished product performance is good, can satisfy the requirement of standard GB 9776-88.
The technical scheme that the present invention solves its technical problem is:
The present invention relates to a kind ofly prepare the method for building gypsum plaster, may further comprise the steps with phosphogypsum:
A, according to the difference of solvable phosphorus content in the phosphogypsum, add the carbonate stone flour or the carbonate stone flour compound that account for phosphogypsum weight 1～80%, after the pulverizing, mix with phosphogypsum;
B, the constant temperature in common building gypsum calcination equipment of the mixture among a is handled, temperature of charge is 150～210 ℃, and the reaction times is 3～12 hours.Make the carbonate reaction in impurity such as solvable phosphorus in the phosphogypsum, fluorine and carbonato stone flour or its title complex, generate the harmless inertia P of phosphogypsum performance, F.
Method of producing building gypsum plaster of the present invention with phosphogypsum, the add-on of described carbonate stone flour or carbonate stone flour compound is generally 1～50%; Be preferably 1～20%.
Method of producing building gypsum plaster with phosphogypsum of the present invention, the fineness of carbonate stone flour or carbonate stone flour compound is preferably less than 0.2mm.
Compared with prior art, the invention has the beneficial effects as follows:
1. utilize carbonato stone flour or its compound the solvable phosphorus of the detrimental impurity in the phosphogypsum, fluorine to be effectively addressed comprehensively,, the solvable phosphorus that phosphogypsum product is had the greatest impact is converted into the harmless inertia phosphorus of phosphogypsum product, fluorine by conversion reaction.
2. carbonato stone flour or its compound can all or part ofly directly be taken from crude substance, and raw material is easy to get, and is with low cost, are convenient to transportation, and the shelf lives is long.
3. present technique need not specific installation, non-secondary pollution.
4. the phosphogypsum calcining temperature is 100～210 ℃, can directly utilize the calciner of existing plaster of Paris to calcine, and specific energy consumption is little mutually to dodge the burning method with high temperature.After calcining, utilize the separating device collection cut size to be lower than the particle of 0.2mm.The building gypsum plaster quality that this method obtains has surpassed the requirement of GB GB9776-88.
| Grade | Premium grads | Acceptable end product | Salable product |
| Folding strength (MPa) | 2.5 | 2.1 | 1.8 |
| Ultimate compression strength (MPa) | 4.9 | 3.9 | 2.9 |
| 0.2mm square hole sieve tails over (%) | 5.0 | 10.0 | 15.0 |
| Time of coagulation (min) | Initial set 〉=6, final set≤30 | ||
(4) embodiment
Embodiment one
The content that records solvable phosphorus in the phosphogypsum is 6%, the adding fineness stirs less than the carbonate stone flour 80g of 0.2mm in this kind phosphogypsum 100g, above-mentioned material is dropped into frying in the gypsum calcination equipment, 180 ℃ of control temperature of charge, react after 5 hours, be lower than the particle of 0.2mm with the separating device collection cut size, finished product material homogenizing 24 hours can obtain building gypsum plaster.Its folding strength is 1.95MPa, and ultimate compression strength is 3.32MPa, and in 13 minutes presetting periods, final setting time is 21 minutes.
Embodiment two
The content that records solvable phosphorus in the phosphogypsum is 4%, the adding fineness stirs less than the carbonate stone flour 60g of 0.2mm in this kind phosphogypsum 100g, above-mentioned material is dropped into frying in the gypsum calcination equipment, 180 ℃ of control temperature of charge, react after 5 hours, be lower than the particle of 0.2mm with the separating device collection cut size, finished product material homogenizing 24 hours can obtain building gypsum plaster.Its folding strength is 2.03MPa, and ultimate compression strength is 3.56MPa, and in 12 minutes presetting periods, final setting time is 20 minutes.
Embodiment three
The content that records solvable phosphorus in the phosphogypsum is 4%, the adding fineness stirs less than the carbonate stone flour 40g of 0.2mm in this kind phosphogypsum 100g, above-mentioned material is dropped into frying in the gypsum calcination equipment, 180 ℃ of control temperature of charge, react after 5 hours, be lower than the particle of 0.2mm with the separating device collection cut size, finished product material homogenizing 24 hours can obtain building gypsum plaster.Its folding strength is 2.15MPa, and ultimate compression strength is 4.03MPa, and in 11 minutes presetting periods, final setting time is 20 minutes.
Embodiment four
The content that records solvable phosphorus in the phosphogypsum is 4%, the adding fineness stirs less than the carbonate stone flour 20g of 0.2mm in this kind phosphogypsum 100g, above-mentioned material is dropped into frying in the gypsum calcination equipment, 180 ℃ of control temperature of charge, react after 5 hours, be lower than the particle of 0.2mm with the separating device collection cut size, finished product material homogenizing 24 hours can obtain building gypsum plaster.Its folding strength is 2.18MPa, and ultimate compression strength is 4.67MPa, and in 8 minutes presetting periods, final setting time is 18 minutes.
Embodiment five
The content that records solvable phosphorus in the phosphogypsum is 4%, the adding fineness stirs less than the carbonate stone flour 6g of 0.2mm in this kind phosphogypsum 100g, above-mentioned material is dropped into frying in the gypsum calcination equipment, 180 ℃ of control temperature of charge, react after 5 hours, be lower than the particle of 0.2mm with the separating device collection cut size, finished product material homogenizing 24 hours can obtain building gypsum plaster.Its folding strength is 3.3MPa, and ultimate compression strength is 6.3MPa, and in 7 minutes presetting periods, final setting time is 12 minutes.
Embodiment six
The content that records solvable phosphorus in the phosphogypsum is 1%, the adding fineness stirs less than the carbonate stone flour 1g of 0.2mm in this kind phosphogypsum 100g, above-mentioned material is dropped into frying in the gypsum calcination equipment, 210 ℃ of control temperature of charge, react after 3 hours, be lower than the particle of 0.2mm with the separating device collection cut size, finished product material homogenizing 24 hours, get final product building gypsum plaster.Its folding strength is 3.0MPa, and ultimate compression strength is 6.9MPa, and in 7 minutes presetting periods, final setting time is 10 minutes.
Embodiment seven
The content that records solvable phosphorus in the phosphogypsum is 6%, the adding fineness stirs less than the carbonate stone flour compound 80g (wherein the content of carbonate is 60g) of 0.4mm in this kind phosphogypsum 100g, above-mentioned material is dropped into frying in the gypsum calcination equipment, 180 ℃ of control temperature of charge, react after 5 hours, be lower than the particle of 0.2mm with the separating device collection cut size, finished product material homogenizing 24 hours can obtain building gypsum plaster.Its folding strength is 1.85MPa, and ultimate compression strength is 2.9MPa, and in 13 minutes presetting periods, final setting time is 24 minutes.
Embodiment eight
The content that records solvable phosphorus in the phosphogypsum is 1%, the adding fineness stirs less than the carbonate stone flour compound 6g (wherein carbonate content is 2g) of 0.2mm in this kind phosphogypsum 100g, above-mentioned material is dropped into frying in the gypsum calcination equipment, 160 ℃ of control temperature of charge, react after 10 hours, be lower than the particle of 0.2mm with the separating device collection cut size, finished product material homogenizing 24 hours can obtain building gypsum plaster.Its folding strength is 2.9MPa, and ultimate compression strength is 6.5MPa, and in 9 minutes presetting periods, final setting time is 13 minutes.
Embodiment nine
The content that records solvable phosphorus in the phosphogypsum is 4%, the adding fineness stirs less than the carbonate stone flour 6g of 0.2mm in this kind phosphogypsum 100g, above-mentioned material is dropped into frying in the gypsum calcination equipment, 190 ℃ of control temperature of charge, react after 4 hours, be lower than the particle of 0.2mm with the separating device collection cut size, finished product material homogenizing 24 hours can obtain building gypsum plaster.Its folding strength is 3.1MPa, and ultimate compression strength is 7.1MPa, and in 9 minutes presetting periods, final setting time is 16 minutes.
Embodiment ten
The content that records solvable phosphorus in the phosphogypsum is 4%, the adding fineness stirs less than the carbonate stone flour 6g of 0.2mm in this kind phosphogypsum 100g, above-mentioned material is dropped into frying in the gypsum calcination equipment, 150 ℃ of control temperature of charge, react after 12 hours, be lower than the particle of 0.2mm with the separating device collection cut size, finished product material homogenizing 24 hours can obtain building gypsum plaster.Its folding strength is 3.6MPa, and ultimate compression strength is 7.6MPa, and in 7 minutes presetting periods, final setting time is 11 minutes.
Embodiment 11
The content that records solvable phosphorus in the phosphogypsum is 6%, in this kind phosphogypsum 100g, add the carbonate stone flour 60g of fineness less than 0.4mm, stir, above-mentioned material is dropped into frying in the gypsum calcination equipment, 200 ℃ of control temperature of charge reacted after 3 hours, were lower than the particle of 0.2mm with the separating device collection cut size, finished product material homogenizing 24 hours can obtain building gypsum plaster.Its folding strength is 2.01MPa, and ultimate compression strength is 3.59MPa, and in 12 minutes presetting periods, final setting time is 20 minutes.
Embodiment 12
The content that records solvable phosphorus in the phosphogypsum is 6%, in this kind phosphogypsum 100g, add the carbonate stone flour compound 40g (wherein carbonate containing stone flour 20g) of fineness less than 0.4mm, stir, above-mentioned material is dropped into frying in the gypsum calcination equipment, 170 ℃ of control temperature of charge reacted after 9 hours, were lower than the particle of 0.2mm with the separating device collection cut size, finished product material homogenizing 24 hours can obtain building gypsum plaster.Its folding strength is 2.31MPa, and ultimate compression strength is 4.32MPa, and in 10 minutes presetting periods, final setting time is 20 minutes.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100436181A CN100396636C (en) | 2006-04-24 | 2006-04-24 | Method for preparing building gypsum powder with phosphogypsum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100436181A CN100396636C (en) | 2006-04-24 | 2006-04-24 | Method for preparing building gypsum powder with phosphogypsum |
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| Publication Number | Publication Date |
|---|---|
| CN1844009A true CN1844009A (en) | 2006-10-11 |
| CN100396636C CN100396636C (en) | 2008-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006100436181A Expired - Fee Related CN100396636C (en) | 2006-04-24 | 2006-04-24 | Method for preparing building gypsum powder with phosphogypsum |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102046557B (en) * | 2008-05-09 | 2014-10-15 | 克劳迪亚斯·彼得斯工程有限责任公司 | Method and device for calcinating phosphorous plaster |
| CN105967617A (en) * | 2016-03-29 | 2016-09-28 | 蚌埠华东石膏有限公司 | Insulation building gypsum powder with sound-absorption and noise-reduction function and preparation method thereof |
| CN109734341A (en) * | 2019-03-13 | 2019-05-10 | 西南科技大学 | A kind of phosphogypsum physicochemical whitening and method for preparing cementitious material |
| CN110194605A (en) * | 2019-06-28 | 2019-09-03 | 山东高速齐鲁建设集团有限公司 | A method of building gypsum is prepared using ardealite |
| CN111003956A (en) * | 2019-12-11 | 2020-04-14 | 湖北田鑫建材有限公司 | Manufacturing process of phosphorus building gypsum powder |
| CN111170668A (en) * | 2020-01-10 | 2020-05-19 | 江苏一夫科技股份有限公司 | Calcination treatment method of phosphogypsum and application of obtained phosphogypsum |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104310826B (en) * | 2014-10-16 | 2016-09-07 | 湖南昌迅科技环保股份有限公司 | A kind of solid-liquid separating method of α gypsum high temperature slurries |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1304319C (en) * | 2005-06-14 | 2007-03-14 | 江苏瑞和化肥有限公司 | Process for producing building gypsum powder by phosphorus gypsum |
-
2006
- 2006-04-24 CN CNB2006100436181A patent/CN100396636C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102046557B (en) * | 2008-05-09 | 2014-10-15 | 克劳迪亚斯·彼得斯工程有限责任公司 | Method and device for calcinating phosphorous plaster |
| CN105967617A (en) * | 2016-03-29 | 2016-09-28 | 蚌埠华东石膏有限公司 | Insulation building gypsum powder with sound-absorption and noise-reduction function and preparation method thereof |
| CN109734341A (en) * | 2019-03-13 | 2019-05-10 | 西南科技大学 | A kind of phosphogypsum physicochemical whitening and method for preparing cementitious material |
| CN109734341B (en) * | 2019-03-13 | 2021-05-28 | 西南科技大学 | A kind of phosphogypsum physicochemical whitening and method for preparing cementitious material |
| CN110194605A (en) * | 2019-06-28 | 2019-09-03 | 山东高速齐鲁建设集团有限公司 | A method of building gypsum is prepared using ardealite |
| CN111003956A (en) * | 2019-12-11 | 2020-04-14 | 湖北田鑫建材有限公司 | Manufacturing process of phosphorus building gypsum powder |
| CN111170668A (en) * | 2020-01-10 | 2020-05-19 | 江苏一夫科技股份有限公司 | Calcination treatment method of phosphogypsum and application of obtained phosphogypsum |
| CN111170668B (en) * | 2020-01-10 | 2022-07-12 | 江苏一夫科技股份有限公司 | Calcination treatment method of phosphogypsum and application of obtained phosphogypsum |
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| Publication number | Publication date |
|---|---|
| CN100396636C (en) | 2008-06-25 |
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