CN101671135B - Curing method of industrial waste gypsum - Google Patents
Curing method of industrial waste gypsum Download PDFInfo
- Publication number
- CN101671135B CN101671135B CN2009102722232A CN200910272223A CN101671135B CN 101671135 B CN101671135 B CN 101671135B CN 2009102722232 A CN2009102722232 A CN 2009102722232A CN 200910272223 A CN200910272223 A CN 200910272223A CN 101671135 B CN101671135 B CN 101671135B
- Authority
- CN
- China
- Prior art keywords
- gypsum
- curing
- pressure
- industrial waste
- curing agent
- 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.)
- Expired - Fee Related
Links
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a curing method of industrial waste gypsum. The curing method comprises the following steps: spraying or coating a liquid curing agent to the surface of a pressure forming machine roller or a pressure plate; pressing and forming the industrial waste gypsum with 12 percent to 20 percent of moisture content; absorbing the curing agent on the surface layer of the formed gypsum, or spraying the liquid curing agent on the surface of the formed gypsum; and forming the cured gypsum with a hard shell by the hardening of the liquid curing agent, wherein the mass of the curing agent is 0.3 to 1.0 percent of that of the gypsum. The cured gypsum can be used as the raw material of a cement retarder and building gypsum. The method can be used for curing the industrial waste gypsums, such as phosphogypsum, desulfurization gypsum, yellow gypsum, saltern gypsum and salt gypsum and the like. The curing agent is water glass, an anhydride curing agent, epoxy resin, a polyurethane curing agent or an organic silicon curing agent. The pressure forming machine can be a pressure pelletizer, a pressure brick making machine or pressure block forming equipment, pressure strip forming equipment and pressure bar forming equipment.
Description
Technical field
The invention belongs to the solid waste process field, is a kind of with industrial waste gypsum curing back making cement retardant or the raw-material method of plaster of Paris.
Background technology
The turnout of the phosphogypsum that China is annual surpasses 3,000 ten thousand tons, and annual desulfurated plaster reaches 1,000 ten thousand tons, and China also has the generation of other a large amount of chemical waste gypsums, and present utilization ratio is very low.Effective constituent CaSO in common these waste gypsums
4.2H
2O, CaSO
4.1/2H
2O and CaSO
4Content all be higher than the plaster of paris, can replace the usefulness of the plaster of paris fully as cement setting retarder or preparation plaster of Paris even high strength gypsum.But phosphogypsum, desulfurated plaster etc. be a kind of aqueous powder of paste normally; Water ratio is higher; Has higher viscosity again; It very easily is attached in course of conveying on the transportation equipment, in the process that its feeding is got into equipment such as grinding machine, occur easily stopping up and the influence metering stable with accurately, influence product quality stability.
Through the curing agglomeration technique of industrial waste gypsum, industrial waste gypsum is solidified into spherical, bulk or particulate state, can overcome above problem, multiple curing agglomeration technique had appearred in China in recent years, can be divided into 4 types substantially:
1, half water, two water laws: earlier gypsum dehydration is formed CaSO
4.1/2H
2O; Under the water spray condition, use pan-pelletizer to be spheroidal particle with semi-hydrated gypsum powder is body formed, utilize the gelling of semi-hydrated gypsum to be solidified into the spheroidal particle of certain intensity, its advantage is that balling ratio is high; Quick solidifying, intensity height, production are stablized; But its cost is high, energy consumption is high, and its product is compared with the plaster of paris, and price advantage is not obvious.
2, powder solidifying agent method: utilize both economical powder solidifying agent and the even mix of waste gypsum, adopt pressure to become the mode moulding of piece or balling-up.Its shortcoming is that insufficient strength is high, and the intensity height is then wanted too high solidifying agent volume if desired, influences economy, efflorescence easily behind the solidified waste gypsum in addition.
3, body solidifying agent method: adopt LCM and waste gypsum to mix, become the piece balling-up under the pressure effect.Be characterized in that solidifying agent is somewhat expensive usually, volume is low, so the bad assurance of the homogeneity of its mix, also efflorescence easily after waste gypsum solidifies.
4, lime fly ash solidification method: this be the applicant of this patent method of once inventing (Shen Weiguo, Nie Jiqiang, Zhou Mingkai. the research of ardealite setting retarder for cement. phosphate fertilizer and multiple fertile .2005; (5): 21-23); This method is that the solidifying agent cost is low; Form slowly but shortcoming is an intensity, some factory can not have lime fly ash and waste gypsum resource simultaneously, yet efflorescence easily after waste gypsum solidifies.
Waste gypsum solidified key is: the gypsum after the curing granulates in transportation and does not destroy, and does not produce dust pollution, therefore requires breakage rate and Pulverization ratio in 20～30%; Can keep globality and not efflorescence, play ash and airborne dust in that the effect of water is little.More than mix with waste gypsum through solidifying agent and to make the waste gypsum integrally curing, be formed with the cured body of certain intensity.Solidified is that the mix of solidifying agent is even at all, and solidifying agent must have suitable volume to form certain intensity.
The curing of waste gypsum does not need whole curing; If can will solidify the surface of gypsum is cured; Its inside can rely on the intergranular internal friction of waste gypsum and capillary adsorption and keep globality; Can save a large amount of solidifying agent like this, the solidifying agent usage quantity is about about 10～50%wt of integrally curing method hardener dose.Simultaneously, because solidifying agent mainly concentrates on the surface of spheroid, can guarantee also that therefore the surface can efflorescence not play ash, be a kind of curing of economical and efficient.
Summary of the invention
Technical problem to be solved by this invention; Be to the hardener dose that exists in the present curing high; The uneven problem of mix adopts the liquid curing-agent spray, spreads upon on the roller or pressing plate of pressure forming machine, and the waste gypsum material that will contain certain moisture is at forming under the pressure; Perhaps the gypsum surface after moulding is sprayed the certain amount of fluid solidifying agent; The surface attachment of waste gypsum type body has one deck solidifying agent like this, and has formed hard housing, and inner waste gypsum has also formed enough intensity under pressure.This curing gypsum is outer hard interior strong, and balling ratio is high, can reach more than 90%; Surface compact can be owing to solidifying agent adds the irregular efflorescence that forms; Good stability under the immersion of water.Use this technology to solidify waste gypsum, the yield rate of product is high, no airborne dust.
Technical scheme of the present invention is:
A kind of curing of industrial waste gypsum; It is characterized in that utilize LCM to spray or spread upon the surface of pressure forming machine running roller or pressing plate, will contain the moisture quality is the industrial waste gypsum compression moulding of 12%-20%; The top layer of molding of gypsum is adsorbed with solidifying agent; The perhaps gypsum surface spraying liquid solidifying agent after moulding promptly is formed with the curing gypsum of hard housing through the sclerosis of liquid curing-agent, and the amount of its solidifying agent is 0.3～1.0% of a gypsum quality.
The curing of aforesaid industrial waste gypsum for accelerating the curing progress, adopts the mode of spraying to spray into the intensity that gypsum is solidified in the hardening accelerator enhancing on the surface of solidifying gypsum, and this curing gypsum is used for the starting material of cement setting retarder or plaster of Paris.
Industrial waste gypsum of the present invention is a chemical waste gypsum: phosphogypsum, desulfurated plaster, Huangshi cream, saline gypsum or sugared gypsum.
LCM of the present invention is one or more compound in water glass, acid anhydride type curing agent (like H-167) or polyurethane curing agent (claiming PU solidifying agent or EPU solidifying agent again) or low viscosity epoxy resin 802,804 or 806.
In the curing of industrial waste gypsum of the present invention, described pressure forming machine is that pressure nodulizer or pressure become piece or pressure slivering or becomes excellent equipment.
Hardening accelerator of the present invention; It for LCM is water glass the hexafluorosilicic acid sodium solution; For LCM is epoxy resin any of curable epoxide promotor quadrol, hexanediamine, diethylenetriamine, triethylene tetramine, or AC2001.
Embodiment
Further specify the present invention through embodiment below.
Following embodiment utilizes the LCM spray or spreads upon the surface of pressure forming machine running roller or pressing plate; To contain the moisture quality is the industrial waste gypsum compression moulding of 12%-20%; The top layer of molding of gypsum is adsorbed with solidifying agent; The perhaps gypsum surface spraying liquid solidifying agent after moulding promptly is formed with the curing gypsum of hard housing through the sclerosis of liquid curing-agent, and the amount of its solidifying agent is 0.3～1.0% of a gypsum quality.Its industrial waste gypsum is a chemical waste gypsum: phosphogypsum, desulfurated plaster, Huangshi cream, saline gypsum or sugared gypsum.LCM is one or more compound in water glass, acid anhydride type curing agent (like H-167) or polyurethane curing agent (claiming PU solidifying agent or EPU solidifying agent again) or low viscosity epoxy resin 802,804 or 806.LCM is that epoxy resin is any of curable epoxide promotor quadrol, hexanediamine, diethylenetriamine, triethylene tetramine, or AC2001.
Embodiment 1
Roller surface spray one deck water glass at the pressure nodulizer; Contain quality and be 12～18% phosphogypsum feeding pressure nodulizer, the pressure nodulizer is cured as spheroid with phosphogypsum, and the curing phosphogypsum balling ratio of preparation reaches 90%; Loose gypsum content does not have airborne dust less than 2% in the plant area.When the rainy day, curing was slow, can solidify the ball surface at phosphogypsum and spray a little hexafluorosilicic acid sodium solution with the mode of spraying, its amount is 0.005% of gypsum quality.Be made into concentration and be 10% solution and use, be sprayed onto the surface of solidifying ball with atomizer during use.Product is used for cement setting retarder.
Embodiment 2
One-tenth brick clamp surface spray one deck water glass at the pressure brick press; Contain quality and be 12～18% desulfurated plaster feeding brick pressing machine, brick pressing machine is cured as fragment of brick with desulfurated plaster, and the curing desulfurated plaster ratio of briquetting of preparation reaches 90%; Loose gypsum content does not have airborne dust less than 3% in the plant area.When the rainy day, curing was slow, can spray a little hexafluorosilicic acid sodium solution with the mode of spraying on the desulfurized gypsum brick surface, its amount is 0.002% of gypsum quality.
Embodiment 3
Roller surface spray one deck acid anhydride type curing agent (like H-167) at the pressure nodulizer; Contain quality and be 12～18% phosphogypsum feeding pressure nodulizer; The pressure nodulizer is cured as spheroid with phosphogypsum; The curing phosphogypsum balling ratio of preparation reaches 90%, and loose gypsum content does not have airborne dust less than 2% in the plant area.When the rainy day, curing was slow, can solidify the ball surface at phosphogypsum and spray a little toughener solution with the mode of spraying, its amount is 0.002% of gypsum quality.Product can be used for cement setting retarder.
Embodiment 4
Roller surface spray one deck epoxy resin 802 at the pressure nodulizer; In 804 or 806 one or more compound; Contain quality and be 12～18% phosphogypsum feeding pressure nodulizer, the pressure nodulizer is cured as spheroid with phosphogypsum, and the curing phosphogypsum balling ratio of preparation reaches 90%; Loose gypsum content does not have airborne dust less than 2% in the plant area.When the rainy day, curing was slow, can solidify the ball surface at phosphogypsum and spray a little epoxy resin cure accelerant A C2001 solution with the mode of spraying, its amount is 0.005% of gypsum quality.Product is used for cement setting retarder.
Embodiment 5
Roller surface spray one deck water glass at the pressure nodulizer; Contain quality and be 14～20% sugared gypsum feeding pressure nodulizer, the pressure nodulizer is cured as spheroid with phosphogypsum, and the curing sugar gypsum balling ratio of preparation reaches 90%; Loose gypsum content does not have airborne dust less than 2% in the plant area.When the rainy day, curing was slow, can solidify the ball surface at phosphogypsum and spray a little hexafluorosilicic acid sodium solution with the mode of spraying, its amount is 0.005% of gypsum quality.Product is used for cement setting retarder.
Embodiment 6
To contain quality and be 12～18% the phosphogypsum and the uniform mixture feeding of the mix pressure nodulizer of flyash; The pressure nodulizer is with phosphogypsum and the flyash fixed spheroid that turns to; At spherome surface spray one deck water glass, its amount is about 1% of gypsum weight, and the curing phosphogypsum balling ratio of preparation reaches 90%; Loose gypsum content does not have airborne dust less than 2% in the plant area.Solidify in the rainy day and can spray a little hexafluorosilicic acid sodium solution in the mode that phosphogypsum solidifies the ball surface spray in slow, its amount is 0.005% of gypsum quality.Product is used for cement setting retarder.
Claims (6)
1. the curing of an industrial waste gypsum; It is characterized in that utilize LCM to spray or spread upon the surface of pressure forming machine running roller or pressing plate, will contain the moisture quality is the industrial waste gypsum compression moulding of 12%-20%; The top layer of molding of gypsum is adsorbed with solidifying agent; The perhaps gypsum surface spraying liquid solidifying agent after moulding promptly is formed with the curing gypsum of hard housing through the sclerosis of liquid curing-agent, and the amount of its solidifying agent is 0.3～1.0% of a gypsum quality.
2. according to the curing of the described industrial waste gypsum of claim 1; It is characterized in that; For accelerating the curing progress, adopt the mode of spraying to spray into the intensity that gypsum is solidified in the hardening accelerator enhancing on the surface of solidifying gypsum, this curing gypsum is used for the starting material of cement setting retarder or plaster of Paris.
3. according to the curing of claim 1 or 2 described industrial waste gypsums, it is characterized in that described industrial waste gypsum is a chemical waste gypsum: phosphogypsum, desulfurated plaster, Huangshi cream, saline gypsum or sugared gypsum.
4. according to the curing of the described industrial waste gypsum of claim 1, it is characterized in that described LCM is a water glass, or polyurethane curing agent, or one or more compound in low viscosity epoxy resin 802,804 or 806.
5. according to the curing of the described industrial waste gypsum of claim 1, it is characterized in that described pressure forming machine is that pressure nodulizer or pressure become piece or pressure slivering or becomes excellent equipment.
6. according to the curing of the described industrial waste gypsum of claim 2; It is characterized in that; Described hardening accelerator; Being the hexafluorosilicic acid sodium solution for LCM is water glass, is any of curable epoxide promotor quadrol, hexanediamine, diethylenetriamine, triethylene tetramine for LCM is epoxy resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102722232A CN101671135B (en) | 2009-09-25 | 2009-09-25 | Curing method of industrial waste gypsum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102722232A CN101671135B (en) | 2009-09-25 | 2009-09-25 | Curing method of industrial waste gypsum |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101671135A CN101671135A (en) | 2010-03-17 |
| CN101671135B true CN101671135B (en) | 2012-03-07 |
Family
ID=42018593
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102722232A Expired - Fee Related CN101671135B (en) | 2009-09-25 | 2009-09-25 | Curing method of industrial waste gypsum |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101671135B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105622165A (en) * | 2014-11-07 | 2016-06-01 | 万峰石材科技股份有限公司 | Artificial stone rough block curing process |
| CN106083190B (en) * | 2016-06-22 | 2019-06-18 | 何宝成 | A kind of preparation method of plastering |
| CN107382252A (en) * | 2017-06-28 | 2017-11-24 | 常州市瑞泰物资有限公司 | A kind of reinforced plasterboard and preparation method thereof |
| CN110436805B (en) * | 2018-05-04 | 2021-09-21 | 北新集团建材股份有限公司 | Caulking gypsum powder, preparation method thereof and phosphogypsum harmless treatment method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2272363Y (en) * | 1996-11-05 | 1998-01-14 | 任志坚 | Composite plate made of metal and gypsum |
| CN101033128A (en) * | 2007-04-24 | 2007-09-12 | 福州大学 | Raw material formulation for ceramics polymer composite material and preparing method |
| CN101479209A (en) * | 2006-06-29 | 2009-07-08 | 吉野石膏株式会社 | Process for producing calcined gypsum and gypsum board |
-
2009
- 2009-09-25 CN CN2009102722232A patent/CN101671135B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2272363Y (en) * | 1996-11-05 | 1998-01-14 | 任志坚 | Composite plate made of metal and gypsum |
| CN101479209A (en) * | 2006-06-29 | 2009-07-08 | 吉野石膏株式会社 | Process for producing calcined gypsum and gypsum board |
| CN101033128A (en) * | 2007-04-24 | 2007-09-12 | 福州大学 | Raw material formulation for ceramics polymer composite material and preparing method |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2003-24900A 2003.01.28 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101671135A (en) | 2010-03-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101671135B (en) | Curing method of industrial waste gypsum | |
| CN105130235B (en) | Casing method of dredging sediment non-sintered ceramsites | |
| CN103694055B (en) | Organic-inorganic compound mixed fertilizer granulation compound binding agent and preparation method and application | |
| CN108083739B (en) | Phosphogypsum hydraulic road material and preparation method thereof | |
| CN101774790A (en) | Cement admixture and method for promoting concrete curing with carbon dioxide | |
| CN102336550A (en) | Non-steamed brick and preparation method thereof | |
| CN105367009A (en) | Sludge curing agent and preparing method and application thereof | |
| CN101607812A (en) | A kind of compound curing agent of high cement slurry | |
| CN103922664A (en) | Lightweight partition plate produced by using oil refining waste catalyst and its preparation method | |
| CN100467431C (en) | Method of manufacturing endoplasm tower type fused mass granulating slow and control release composite fertilizer | |
| CN101941043A (en) | Water glass sand hardener | |
| CN115321890A (en) | Solid waste base binder for carbon dioxide sequestration, preparation method and carbon dioxide sequestration method thereof | |
| CN113354376B (en) | Phosphogypsum-based aggregate and preparation method thereof | |
| CN111410496A (en) | Road base material and preparation method thereof | |
| CN102417369A (en) | Building phosphogypsum powder thermal insulation material and preparation method thereof | |
| CN102034560B (en) | Method for solidifying radioactive waste resin cement | |
| CN111732356A (en) | Low-toxicity phosphogypsum-based high-strength artificial aggregate and preparation method thereof | |
| CN105110740A (en) | Organic-inorganic composite water-retaining plant-growth cement-base material | |
| FI123552B (en) | Structured binder composition | |
| CN113185246B (en) | Preparation process of solid waste soil curing agent | |
| CN102877648B (en) | Anti-carbonization maintenance film and method for cast-in-situ concrete vertical face | |
| CN108483963A (en) | A kind of pretreatment of particles technique for packing reducing haydite water absorption rate | |
| CN107602004A (en) | A kind of multi-element, inorganic composite granule soil solidification additive | |
| CN107551444A (en) | A kind of powder extinguishing agent and preparation method thereof | |
| CN110342845B (en) | Method for manufacturing sand by using iron tailing slag |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120307 Termination date: 20140925 |
|
| EXPY | Termination of patent right or utility model |