CN1448357A - Phosphogypsum wall covering and prep. thereof - Google Patents
Phosphogypsum wall covering and prep. thereof Download PDFInfo
- Publication number
- CN1448357A CN1448357A CN 02110236 CN02110236A CN1448357A CN 1448357 A CN1448357 A CN 1448357A CN 02110236 CN02110236 CN 02110236 CN 02110236 A CN02110236 A CN 02110236A CN 1448357 A CN1448357 A CN 1448357A
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- Prior art keywords
- phosphogypsum
- wall covering
- industrial
- additive
- dehydrated gyp
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/16—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing anhydrite, e.g. Keene's cement
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Finishing Walls (AREA)
Abstract
The high-quality wall surface material is produced with water soluble active anhydrous gypsum obtained through dewatering industrial ardealite in 70-75 wt%, calcium lime in 15-20 wt%, and additives including calcined wollastonite and bauxite in 8-12 wt%, and through mixing and grinding. The wall surface material has low cost, high strength, high performance, proper initial solidification time and final solidification time, high adhesion to the various base layer material and other advantages. In addition, the utilization of industrial ardealite as waste can reduce industrial pollution.
Description
Technical field
The invention belongs to the technology of utilizing of industrial residue, with industrial phosphogypsum slag production high-quality wall covering.
Background technology
On the one hand, industrial phosphogypsum is the industrial residue that phosphoric acid and phosphate industry produce, and can not get good utilization in our country for many years always, the good farmland that occupies cultivated land, and the chronic pollution environment is an environmental protection difficult problem that hinders industrial development.
On the other hand, traditional wall covering, be to be the mixed mortar of base-material with cement, construction time is longer, often need 30-40 days time, the influence that construction is changed by seasonal temperature often particularly also exposes a lot of adverse factors on performance, as common quality defects such as drying shrinkage, be full of cracks, a drum, the accumulation of salt in the surface soil.In addition, along with requirement and the improvement of environmental protection to three small businesss, low-grade cement will be withdrawn from the market gradually, the substitute is high grade, cement that production cost is high, use cement as wall covering so traditionally, and cost will increase substantially.So,, be badly in need of novel wall covering and come into the market as the substitute of cement along with the progress of society.
At present, have the report that gypsum is used for wall covering, make the update of wall covering push ahead a step.Gypsum has multiple different existence, the state difference, and performance is different.The industry phosphogypsum is a kind of loose terra alba slag charge, and acidity is big again, can not directly use, and need carry out performance adjustment, materials adjusting, could adapt to industrial application.
Summary of the invention
Technical problem to be solved by this invention is: a kind of usefulness wall covering that industrial phosphogypsum is produced is provided, and cost is low, the intensity height, performance is good, and initial set, final setting time suit, and the construction time is short, all has stronger cohesive force with various basic units, construction is not subjected to the variable effect of seasonal temperature, and sclerosis back volume stability is difficult for cracking, hollowing, the disadvantage that comes off, no later stage accumulation of salt in the surface soil phenomenon, and the metope any surface finish, the exquisiteness that form are durable in use, nontoxic, nuisanceless; Its preparation method is scientific and reasonable, and is simple.
Phosphogypsum wall covering of the present invention, its ingredients by weight percentage composition is:
Solvable active dehydrated gyp-70～75% after the industry phosphogypsum anhydrates
Unslaked lime 15～20%
Additive 8～12%
Wherein:
Additive is the calcining material of wollastonite and bauxitic clay.
Additive preferably contains following weight percent to be formed:
Al
2O
3?10～25％、SiO
2?25～45％、CaO?15～35％。
The calcining temperature of additive is advisable with 700～800 ℃, has both guaranteed certain cohesiveness, and it is too big to be unlikely to water capacity again, hinders follow-up construction processing.
Industrial phosphogypsum is processed into solvable active dehydrated gyp-, had both changed the existence of phosphogypsum, changed the performance of phosphogypsum, avoided again the problem that semi-hydrated gypsum can influence the presetting period occurring,, be not easy to constructing operation because the presetting period is too short.Unslaked lime, on the one hand in the energy and the acidity of phosphogypsum, the later strength that helps promoting the formation of metope and strengthen metope of the suction heat release when using on the other hand.The calcining material of wollastonite and bauxitic clay, natural mineral aggregate, cohesiveness is good, itself have workability preferably, the initial stage fabrication strength of metope and the later strength of metope are had crucial effects, and water-soluble substances is few, the bleeding segregation is not convenient to constructing operation, avoids later stage accumulation of salt in the surface soil phenomenon again.In order to guarantee overall performance and intensity, preferably with the Al in the additive
2O
3, SiO
2, CaO content controls, other mineralogical composition does not have any particular requirement, general knowledge gets final product routinely, certainly, under condition as much as possible, can select fine mineral reserve raw material, as it is few to contain the ferric oxide amount, can guarantee whiteness of metope or the like.
The preparation method of described wall covering at first carries out pre-treatment to industrial phosphogypsum, and industrial phosphogypsum is anhydrated makes solvable active dehydrated gyp-, more active dehydrated gyp-is made with grinding after unslaked lime, additive mix simultaneously.Scientific and reasonable, simple, make full use of the hydrolysis exothermic character of unslaked lime, unslaked lime on the one hand in and the residual acidity of dehydrated gyp-, on the other hand, the hydrolysis heat release helps carrying out smoothly of hybrid reaction, promote the conversion of dehydrated gyp-, improve, strengthen later strength to dihydrate gypsum.
The pre-treatment of anhydrating of industry phosphogypsum is at first industrial phosphogypsum heating to be made semi-hydrated gypsum, and then heating makes solvable active dehydrated gyp-.Want strict control,, can make active dehydrated gyp-become " dead gypsum " and lose usability in case exceed processing condition.
The powder that grinds of wall covering is advisable to cross 140～180 mesh sieves.
Using method:
(1) layers of material weight proportion
Low layer is plastered:
(1) wall covering mortar of the present invention: wall covering of the present invention: sand=1: 2～3
(2) gypsum lime mixed mortar: wall covering of the present invention: lime putty: sand=1: 1: 5～7.
The ratio of mortar and water can so that constructing operation be advisable.Smear the first pass bottom and can be controlled in about 10mm, about second layer 8mm.
Finish coat
Surface material proportioning wall covering of the present invention: water (or 107 glue) 1: 0.3～0.4
Finish coat can directly use with wall covering and water proportioning, under a stable condition, for the special intensity that increases surface layer, can be used with 107 glue.
(2) base treatment
1, it is clean the attached dirt on pending basic unit's face, impurity, dirt etc. to be influenced the contaminant removal of basic unit's bonding force, and serious uneven position of basic unit and hole, plate stitch available wall covering mortar levelling of the present invention, and be stand-by.
2, substrate surface is fully wetting at preceding 1～2 day water of plastering, and make the infiltration degree of depth reach 8～10mm, but substrate surface must not have the visible globule or water layer before plastering, and plasters operational difficulty and influences the normal aquation of wall covering in case cause, and causes imperfect bonding.
3, lightweight such as gas concrete, gypsum block body of wall should first spary 107 glue solutions before smearing bottom ash, or scrape one deck and mix 1: 0.4 wall covering gypsum of the present invention of system with 107 glue solutions and starch only, to increase the bonding strength of surface layer.
(3) material stirs
1, wall covering mortar of the present invention: after starting stirrer, add earlier and estimate the about 80% of water consumption, in the process of continuously stirring, add lime putty, sand, wall covering powder of the present invention successively, replenish at last and add water, mortar is stirred and meet the requirements of denseness.
2, earlier water is injected in the agitator, gypsum is poured into slowly again, the limit bevelling stirs, and forms uniform slurry, stand-by (will use up) until reaching in 3 hours.
(4) operation of wiping one's face
1, screed: in the basic unit that has handled well, scrape earlier and smear one deck mortar, thickness treats that this layer mortar solidifies back (press...with one's finger motionless but finger mark is arranged), and then smears second time about 10mm, and wipes off, rubs with the hands flat, and the mortar total thickness should be not more than 20mm.
2, starch surface layer only: treat that screed solidifies back (in general 24～48 hours), carry out surface layer and handle that surface layer will be wiped one's face with clean slurry, and rubs flat, press polish with the hands, gauge control is about 2mm.If basic unit is drying, should smear one deck 107 glue solutions earlier, smear slurry then.
3, surface layer maintenance: surface layer will prevent bad harm such as wind, Shui Chong, bump before sclerosis, to prevent that fast doing and damage taken place before sclerosis.
Wall covering basic mechanical design feature index of the present invention and range of application are as follows:
(1) strength development is rapid, and time of coagulation is suitable, and greater than 2 hours, the convenient construction operation was applicable to manual plaster operation and all kinds of mechanical execution requirement.
(2) intensity and water resisting property are better than other brushing gypsum material, and through the authoritative department repeated detection, ultimate compression strength is greater than 30 MPas, and folding strength is greater than 3 MPas.All have stronger cohesive force with various basic units, the influence that construction is changed by seasonal temperature is less.
(3) good frost resistance, low temperature are endured cold does not influence final strength.
(4) sclerosis back volume stability such as is difficult for producing crack, hollowing, come off at disadvantage, avoids the accumulation of salt in the surface soil phenomenon in later stage.
(5) workability can be good, and the bleeding segregation is not convenient to constructing operation.
(6) can anti-various climatopes, excellent in durability.
The scratch coat and the finish coat that can be used for all kinds of concrete surfaces, Slag building block, brick stone block metope, gypsum block and all kinds of wall constructions.
The technical indicator and the national standard comparable situation of wall covering of the present invention detection on March 6th, 2002 see Table 1.
Table 1: the technical indicator and the national standard comparable situation table of the detection on March 6th, 2002 of invention wall covering
| Test item | Performance requriements (operative norm: JC/T517-93) | Experimental result | The individual event evaluation |
| Fineness % | 2.5mm square hole sieve tails over≤and 0 | ?0.0 | Qualified |
| 0.2mm square hole sieve tails over≤and 40 | ?6.7 | Qualified | |
| Time of coagulation | Initial set 〉=1h | ?1h12min | Qualified |
| Final set≤8h | ?2h21min | Qualified | |
| Folding strength MPa | ≥3.0 | ?5.1 | Qualified |
| Ultimate compression strength MPa | ≥5.0 | ?38.1 | Qualified |
The wall covering that the present invention produces with industrial phosphogypsum, cost is low, the intensity height, performance is good; Initial set, final setting time suit, and the construction time is short, 20～30 day time, all have stronger cohesive force with various basic units, and construction is subjected to the variable effect of seasonal temperature little; Sclerosis back volume stability is difficult for cracking, hollowing, the disadvantage that comes off etc., has avoided later stage accumulation of salt in the surface soil phenomenon, and the metope any surface finish, the exquisiteness that form, and is durable in use.Utilize industrial residue, handled industrial pollution source, turn waste into wealth, have good social benefit, economic benefit and environmental benefit, have popularizing application prospect widely.
Description of drawings
Fig. 1, preparation technology's FB(flow block) of the present invention.
Embodiment
The invention will be further described below in conjunction with embodiment.
Used industrial phosphogypsum technical indicator:
Color: canescence,
Acid-basicity: acidity,
Sulfate dihydrate calcium contents: 77～83%
Free water content: 12～14%
Foreign matter content: 3～5%
The pre-treatment of anhydrating of phosphogypsum: at first industrial phosphogypsum is heated to 120～130 ℃ and makes semi-hydrated gypsum, and then be heated to 230～270 ℃ and make solvable active dehydrated gyp-.
The chemical weight percentage composition of the used wollastonite of additive, bauxitic clay sees Table 2,700～800 ℃ of calcining temperatures.
The chemical weight percentage composition table of table 2, wollastonite, bauxitic clay calcining material
The ingredients by weight percentage composition of embodiment 1, phosphogypsum wall covering of the present invention is:
| SiO 2 | ?Al 2O 3 | ?CaO | ?Fe 2O 3(TiO 2) | MgO | ?K 2O | ?Na 2O | |
| Wollastonite 1 # | 35 | ?0.6 | ?55 | Do not survey | |||
| Wollastonite 2 # | 45 | ?0.4 | ?45 | ||||
| Wollastonite 3 # | 27 | ?0.3 | ?60 | ||||
| Wollastonite 4 # | 56 | ?0.6 | ?29 | ||||
| Bauxitic clay 1 # | 48 | ?42 | ?0.5 | ||||
| Bauxitic clay 2 # | 50 | ?30 | ?0.5 | ||||
| Bauxitic clay 3 # | 45 | ?48 | ?0.6 | ||||
| Bauxitic clay 4 # | 47 | ?36 | ?0.5 | ||||
Solvable active dehydrated gyp-73% after the industry phosphogypsum anhydrates
Unslaked lime 17%
Wollastonite, bauxitic clay calcining feed additives 10%
Wherein, Al in the additive
2O
3, SiO
2, CaO chemical weight percentage be:
Al
2O
3?22％、SiO
2?45％、CaO?27％。
The preparation method: the solvable active dehydrated gyp-after industrial phosphogypsum anhydrated with ground 150 mesh sieves after unslaked lime, additive mix simultaneously and make powder and make wall covering of the present invention.The ingredients by weight percentage composition of embodiment 2, phosphogypsum wall covering of the present invention is:
Solvable active dehydrated gyp-70% after the industry phosphogypsum anhydrates
Unslaked lime 18%
Wollastonite, bauxitic clay calcining feed additives 12%
Wherein, Al in the additive
2O
3, SiO
2, CaO chemical weight percentage be:
Al
2O
3?23％、SiO
2?41％、CaO?29％。
The preparation method: the dehydrated gyp-after industrial phosphogypsum anhydrated with ground 160 mesh sieves after unslaked lime, additive mix simultaneously and make powder and make wall covering of the present invention.The ingredients by weight percentage composition of embodiment 3, phosphogypsum wall covering of the present invention is:
Solvable active dehydrated gyp-75% after the industry phosphogypsum anhydrates
Unslaked lime 15%
Wollastonite, bauxitic clay calcining feed additives 10%
Wherein, Al in the additive
2O
3, SiO
2, CaO chemical weight percentage be:
Al
2O
3?21％、SiO
2?43％、CaO?18％。
Other is with embodiment 1.The ingredients by weight percentage composition of embodiment 4, phosphogypsum wall covering of the present invention is:
Dehydrated gyp-74% after the industry phosphogypsum anhydrates
Unslaked lime 18%
Wollastonite, bauxitic clay calcining feed additives 8%
Wherein, Al in the additive
2O
3, SiO
2, CaO chemical weight percentage be:
Al
2O
3?16％、SiO
2?36％、CaO?33％。
Other is with embodiment 1.The ingredients by weight percentage composition of embodiment 5, phosphogypsum wall covering of the present invention is:
Dehydrated gyp-72% after the industry phosphogypsum anhydrates
Unslaked lime 17%
Wollastonite, bauxitic clay calcining feed additives 11%
Wherein, Al in the additive
2O
3, SiO
2, CaO chemical weight percentage be:
Al
2O
3?15％、SiO
2?43％、CaO?28％。
Other is with embodiment 1.
Claims (7)
1, a kind of phosphogypsum wall covering is characterized in that its ingredients by weight percentage composition is:
Solvable active dehydrated gyp-70～75% after the industry phosphogypsum anhydrates
Unslaked lime 15～20%
Additive 8～12%.
2, wall covering according to claim 1 is characterized in that additive is the calcining material of wollastonite and bauxitic clay.
3, wall covering according to claim 2 is characterized in that containing in the additive following weight percent and forms:
Al
2O
3?10～25％、SiO
2?25～45％、CaO?15～35％。
4, according to claim 2 or 3 described wall coverings, the calcining temperature that it is characterized in that additive is 700～800 ℃.
5, the preparation method of wall covering according to claim 1, it is characterized in that at first industrial phosphogypsum being carried out pre-treatment, industrial phosphogypsum anhydrated makes solvable active dehydrated gyp-, more active dehydrated gyp-is made with grinding after unslaked lime, additive mix simultaneously.
6, the preparation method of wall covering according to claim 5, the pre-treatment of anhydrating that it is characterized in that industrial phosphogypsum is at first industrial phosphogypsum heating to be made semi-hydrated gypsum, and then heating makes solvable active dehydrated gyp-.
7,, it is characterized in that the powder that grinds was the powder of 140～180 mesh sieves according to claim 5 or 6 described preparation methods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021102368A CN1186287C (en) | 2002-03-29 | 2002-03-29 | Phosphogypsum wall covering and prep. thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021102368A CN1186287C (en) | 2002-03-29 | 2002-03-29 | Phosphogypsum wall covering and prep. thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1448357A true CN1448357A (en) | 2003-10-15 |
| CN1186287C CN1186287C (en) | 2005-01-26 |
Family
ID=28680457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021102368A Expired - Fee Related CN1186287C (en) | 2002-03-29 | 2002-03-29 | Phosphogypsum wall covering and prep. thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1186287C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100364917C (en) * | 2006-10-21 | 2008-01-30 | 杨金平 | Phosphogypsum high-strength wall brick and its production method |
| CN102276228A (en) * | 2011-05-30 | 2011-12-14 | 昆明理工大学 | Preparation method of ardealite recrystallization wall material |
-
2002
- 2002-03-29 CN CNB021102368A patent/CN1186287C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100364917C (en) * | 2006-10-21 | 2008-01-30 | 杨金平 | Phosphogypsum high-strength wall brick and its production method |
| CN102276228A (en) * | 2011-05-30 | 2011-12-14 | 昆明理工大学 | Preparation method of ardealite recrystallization wall material |
| CN102276228B (en) * | 2011-05-30 | 2014-02-12 | 昆明理工大学 | Preparation method of ardealite recrystallization wall material |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1186287C (en) | 2005-01-26 |
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