CN104628276A - Phosphogypsum treatment method - Google Patents
Phosphogypsum treatment method Download PDFInfo
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- CN104628276A CN104628276A CN201510053922.3A CN201510053922A CN104628276A CN 104628276 A CN104628276 A CN 104628276A CN 201510053922 A CN201510053922 A CN 201510053922A CN 104628276 A CN104628276 A CN 104628276A
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Abstract
The invention belongs to a phosphogypsum treatment method. The phosphogypsum treatment method comprises the following steps: (1) pre-treating: ageing phosphogypsum until the content of attached water is 8-10%; (2) combination reaction: adding a modifying agent into the aged phosphogypsum, stirring until the reaction is complete, wherein the weight ratio of the modifying agent to the phosphogypsum is (1-8): 100, the modifying agent is a mixture of lime and a cinerite mixed material, and the weight ratio of the lime to the cinerite mixed material is 1: (1.5-4); (3) drying: drying the phosphogypsum at 360-450 DEG C after the combination reaction until the content of attached water of the phosphogypsum is lower than 2%; and (4) calcining: calcining the dried phosphogypsum at 200-240 DEG C for 6-12 minutes. Granules of the phosphogypsum are more uniform by ageing, and due to the modification of the modifying agent, the acidity of the phosphogypsum is reduced, and the contents of water-soluble fluorine and water-soluble phosphorus are decreased; and then, the phosphogypsum is changed into building phosphogypsum with good performance by drying and calcining.
Description
Technical field
The present invention relates to the technical field that solid waste phosphogypsum is recycled, be specifically related to a kind of phosphogypsum treatment process.
Background technology
Phosphogypsum is the waste residue of phosphorous chemical industry enterprise discharge, and often produce the by-product phosphogypsum that one ton of phosphoric acid can produce about 5 tons, the utilization ratio of current phosphogypsum is extremely low, and major part adopts the method process of piling up, and brings immense pressure to social environment.The effective way of what phosphogypsum Dehydration obtained with β-semi-hydrated gypsum building phosphogypsum that is main component and goods is its recycling, can reach the object consuming a large amount of phosphogypsum slag simultaneously.The unstable properties of phosphogypsum, causes the resource that this source is wide, building function is excellent to be effectively used.The phosphorus plaster of Paris stable performance obtained after adopting the calcining of chemical combination modified phosphogypsum, reliable in quality, can consume a large amount of phosphogypsums, alleviate the pollution to environment.
Summary of the invention
The object of this invention is to provide a kind of phosphogypsum treatment process that solid waste phosphogypsum can be become the phosphorus plaster of Paris of stable performance.
For achieving the above object, the technical solution used in the present invention is, a kind of phosphogypsum treatment process, comprises the following steps: 1. pre-treatment: by phosphogypsum ageing, and ageing is to attached water content 8% ~ 10%; 2. combination reaction: add properties-correcting agent in the phosphogypsum after ageing, be stirred to and react completely, the weight ratio of properties-correcting agent and phosphogypsum is 1 ~ 8: 100, and properties-correcting agent is the mixture of lime, calcareous addition of volcano, and the weight ratio of lime, calcareous addition of volcano is 1: 1.5 ~ 4; 3. dry: the phosphogypsum after combination reaction is dried at 360 ~ 450 DEG C, until the attached water content of phosphogypsum is dried to less than 2%; 4. calcine; Phosphogypsum after drying is calcined 6 ~ 12 minutes at 200 ~ 240 DEG C.
The beneficial effect that the present invention produces is, make a material of phosphogypsum more even by ageing, by modifier modification, phosphogypsum acidity is diminished, the content of water-soluble fluorine, water-soluble phosphorus reduces; Then phosphogypsum is made to become phosphorus plaster of Paris of good performance by drying, calcining.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described, but protection scope of the present invention is not limited thereto.
Embodiment 1
A kind of phosphogypsum treatment process, comprise the following steps: 1. pre-treatment: by phosphogypsum ageing, ageing is to attached water content 9% (mass content); 2. combination reaction: add properties-correcting agent in the phosphogypsum after ageing, be stirred to and react completely, the weight ratio of properties-correcting agent and phosphogypsum is 1: 25, and properties-correcting agent is the mixture of lime, calcareous addition of volcano, and the weight ratio of lime, calcareous addition of volcano is 1: 2.5; 3. dry: the phosphogypsum after combination reaction is dried at 400 DEG C, until the attached water content of phosphogypsum is dried to less than 2%; 4. calcine; Phosphogypsum after drying is calcined 9 minutes at 220 DEG C.
Performance comparison before and after phosphogypsum process in the present embodiment is as table 1.1:
Table 1.1
Intensity contrast before and after phosphogypsum process in the present embodiment is as table 1.2:
Table 1.2
| Before modified, MPa | Modified, MPa | |
| 2h folding strength | 2.8 | 3.1 |
| 2h ultimate compression strength | 5.2 | 6.3 |
Anti-folding, the ultimate compression strength of the phosphorus plaster of Paris obtained after the present embodiment process are all improved, and are greater than 3.0 grade standards (anti-folding >=3.0 of plaster of Paris; Resistance to compression >=6.0).
Embodiment 2
A kind of phosphogypsum treatment process, comprise the following steps: 1. pre-treatment: by phosphogypsum ageing, ageing is to attached water content 8% (mass content); 2. combination reaction: add properties-correcting agent in the phosphogypsum after ageing, be stirred to and react completely, the weight ratio of properties-correcting agent and phosphogypsum is 1: 100, and properties-correcting agent is the mixture of lime, calcareous addition of volcano, and the weight ratio of lime, calcareous addition of volcano is 1: 1.5; 3. dry: the phosphogypsum after combination reaction is dried at 360 DEG C, until the attached water content of phosphogypsum is dried to less than 2%; 4. calcine; Phosphogypsum after drying is calcined 12 minutes at 200 DEG C.
Performance comparison before and after phosphogypsum process in the present embodiment is as table 2.1:
Table 2.1
Intensity contrast before and after phosphogypsum process in the present embodiment is as table 2.2:
Table 2.2
| Before modified, MPa | Modified, MPa | |
| 2h folding strength | 2.8 | 3.0 |
| 2h ultimate compression strength | 5.2 | 6.1 |
Anti-folding, the ultimate compression strength of the phosphorus plaster of Paris obtained after the present embodiment process are all improved, and are greater than 3.0 grade standards (anti-folding >=3.0 of plaster of Paris; Resistance to compression >=6.0).
Embodiment 3
A kind of phosphogypsum treatment process, comprise the following steps: 1. pre-treatment: by phosphogypsum ageing, ageing is to attached water content 10% (mass content); 2. combination reaction: add properties-correcting agent in the phosphogypsum after ageing, be stirred to and react completely, the weight ratio of properties-correcting agent and phosphogypsum is 8: 100, and properties-correcting agent is the mixture of lime, calcareous addition of volcano, and the weight ratio of lime, calcareous addition of volcano is 1: 4; 3. dry: the phosphogypsum after combination reaction is dried at 450 DEG C, until the attached water content of phosphogypsum is dried to less than 2%; 4. calcine; Phosphogypsum after drying is calcined 6 minutes at 240 DEG C.
Performance comparison before and after phosphogypsum process in the present embodiment is as table 3.1:
Table 3.1
Intensity contrast before and after phosphogypsum process in the present embodiment is as table 3.2:
Table 3.2
| Before modified, MPa | Modified, MPa | |
| 2h folding strength | 2.8 | 3.5 |
| 2h ultimate compression strength | 5.2 | 6.6 |
Anti-folding, the ultimate compression strength of the phosphorus plaster of Paris obtained after the present embodiment process are all improved, and are greater than 3.0 grade standards (anti-folding >=3.0 of plaster of Paris; Resistance to compression >=6.0).
Claims (1)
1. a phosphogypsum treatment process, is characterized in that, comprises the following steps: 1. pre-treatment: by phosphogypsum ageing, and ageing is to attached water content 8% ~ 10%; 2. combination reaction: add properties-correcting agent in the phosphogypsum after ageing, be stirred to and react completely, the weight ratio of properties-correcting agent and phosphogypsum is 1 ~ 8: 100, and properties-correcting agent is the mixture of lime, calcareous addition of volcano, and the weight ratio of lime, calcareous addition of volcano is 1: 1.5 ~ 4; 3. dry: the phosphogypsum after combination reaction is dried at 360 ~ 450 DEG C, until the attached water content of phosphogypsum is dried to less than 2%; 4. calcine; Phosphogypsum after drying is calcined 6 ~ 12 minutes at 200 ~ 240 DEG C.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105688362A (en) * | 2016-01-18 | 2016-06-22 | 四川大学 | Stabilizing agent for phosphogypsum and method for innocent treatment of phosphogypsum |
| RU2616008C2 (en) * | 2015-07-20 | 2017-04-12 | Юлия Алексеевна Щепочкина | Raw mixture for manufacturing building material |
| CN106734064A (en) * | 2016-11-29 | 2017-05-31 | 贵阳开磷化肥有限公司 | The ardealite innocent processing unit and its method of a kind of phosphoric acid by wet process output |
| CN107572847A (en) * | 2017-09-25 | 2018-01-12 | 昆明理工大学 | A kind of ardealite of activeness and quietness and preparation method thereof |
| CN109553372A (en) * | 2018-12-26 | 2019-04-02 | 四川绵筑新材料有限公司 | A kind of preparation and application for the ardealite roadbed material that can be recycled |
| CN110436866A (en) * | 2018-05-04 | 2019-11-12 | 北新集团建材股份有限公司 | A kind of bonding gypsum powder and preparation method thereof |
| CN110563362A (en) * | 2018-06-06 | 2019-12-13 | 北新集团建材股份有限公司 | Solid impurity modification method of phosphogypsum and obtained phosphogypsum |
| CN111664493A (en) * | 2020-05-22 | 2020-09-15 | 贵州开磷磷石膏综合利用有限公司 | Quick-heating floor heating module |
| CN113816633A (en) * | 2021-11-04 | 2021-12-21 | 寿光麦实科技合伙企业(有限合伙) | Method for preparing high-quality building gypsum by using phosphogypsum |
| CN114180918A (en) * | 2021-12-27 | 2022-03-15 | 云南胜威化工有限公司 | Phosphogypsum harmless treatment as ecological restoration material and method |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2616008C2 (en) * | 2015-07-20 | 2017-04-12 | Юлия Алексеевна Щепочкина | Raw mixture for manufacturing building material |
| CN105688362A (en) * | 2016-01-18 | 2016-06-22 | 四川大学 | Stabilizing agent for phosphogypsum and method for innocent treatment of phosphogypsum |
| CN106734064A (en) * | 2016-11-29 | 2017-05-31 | 贵阳开磷化肥有限公司 | The ardealite innocent processing unit and its method of a kind of phosphoric acid by wet process output |
| CN107572847A (en) * | 2017-09-25 | 2018-01-12 | 昆明理工大学 | A kind of ardealite of activeness and quietness and preparation method thereof |
| CN110436866A (en) * | 2018-05-04 | 2019-11-12 | 北新集团建材股份有限公司 | A kind of bonding gypsum powder and preparation method thereof |
| CN110563362A (en) * | 2018-06-06 | 2019-12-13 | 北新集团建材股份有限公司 | Solid impurity modification method of phosphogypsum and obtained phosphogypsum |
| CN109553372A (en) * | 2018-12-26 | 2019-04-02 | 四川绵筑新材料有限公司 | A kind of preparation and application for the ardealite roadbed material that can be recycled |
| CN111664493A (en) * | 2020-05-22 | 2020-09-15 | 贵州开磷磷石膏综合利用有限公司 | Quick-heating floor heating module |
| CN111664493B (en) * | 2020-05-22 | 2021-12-21 | 贵州开磷磷石膏综合利用有限公司 | Quick-heating floor heating module |
| CN113816633A (en) * | 2021-11-04 | 2021-12-21 | 寿光麦实科技合伙企业(有限合伙) | Method for preparing high-quality building gypsum by using phosphogypsum |
| CN114180918A (en) * | 2021-12-27 | 2022-03-15 | 云南胜威化工有限公司 | Phosphogypsum harmless treatment as ecological restoration material and method |
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