CN103288410B - Alpha high-strength gypsum based self-leveling material prepared by adopting phosphogypsum and production process thereof - Google Patents
Alpha high-strength gypsum based self-leveling material prepared by adopting phosphogypsum and production process thereof Download PDFInfo
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Abstract
The invention relates to an alpha high-strength gypsum based self-leveling material prepared by adopting phosphogypsum and a production process thereof. The material comprises the following components in percentage by weight: 40-60% of alpha high-strength gypsum powder, 30-50% of aggregates, 1-4% of cement, 1-4% of fly ash, 2-4% of re-dispersible rubber powder, 0.1-0.3% of retarder, 0.2-0.75% of water reducing agent, 0.1-0.25% of water-retaining agent, 0.1-0.4% of air entraining agent and 0.05-0.15% of antifoaming agent. The production process comprises the steps of uniformly mixing the components and obtaining the alpha high-strength gypsum based self-leveling material. The alpha high-strength gypsum based self-leveling material disclosed by the invention has the advantages that the requirements of JC/T1023-2007 Gypsum based Self-leveling Mortar are met and the requirements on the 30min fluidity loss, the initial setting time, the final setting time, the breaking strength, the compressive strength and the shrinking rate are met.
Description
Technical field
The invention belongs to building material technical field, particularly relate to a kind of adopt phosphogypsum to prepare α high strength gypsum based self-leveling material and production technique.
Background technology
Phosphogypsum is that what to be discharged in Wet-process Phosphoric Acid Production process take terra alba as the throw out of main component, is topmost industry byproduct during phosphorous chemical industry is produced.Under normal circumstances, 1 ton of P is produced
2o
54.5 ~ 5.5 tons of phosphogypsums will be discharged.The pH value of phosphogypsum is in acid, and its main component is terra alba, but wherein containing impurity such as certain phosphorus, fluorine, organism, complex chemical composition, is not well utilized at present, and major part is that air storage.In recent years, along with the development of phosphorus chemical industry, the quantity discharged of China's phosphogypsum increases day by day, and China's phosphogypsum generation about 5,000 ten thousand tons in 2009, accumulative volume of cargo in storage, more than 200,000,000 tons, occupies a large amount of land resources.At present, domestic phosphogypsum is mainly for the production of the low value-added product such as cement setting retarder, building gypsum plaster, gypsum brick or building block, so utilize the high value-added products such as the superior Thistle board of phosphogypsum production over-all properties and gypsum-based self-leveling material to be important channel and the research direction of phosphogypsum recycling, there is wide commercial promise and social effect.
Gypsum-based self-leveling material is meticulously configured in factory by gypsum material, extraordinary aggregate and various architectural chemistry additive, mixes and obtained a kind of dry-mix being specifically designed to floor leveling.At present, the established corresponding product standard of China is JC/T1023-2007 " gypsum base gravity flowing levelling mortars ".The patent documentation that China utilizes gypsum to produce gypsum-based self-leveling material aspect mainly contains: 1) Chinese patent CN102190470A discloses a kind of two water desulfurization α high strength gypsum based self-leveling mortar and production methods thereof, its technique is: first the two water desulfurated plasters of 80 ~ 100% and the water of 10 ~ 20% are made slip and add in autoclave, add Tai-Ace S 150 and sodium alkyl benzene sulfonate as medium crystallization agent simultaneously, be raised to certain temperature, insulation for some time, the obtained α high strength gypsum slurry of reaction, slurry is through drying obtained α high strength gypsum powder; Again by α high strength gypsum powder with gather materials, exciting agent, water-holding agent, binding agent, water reducer, defoamer, auxiliary agent by proportioning, measure and mix, make two water desulfurization α high strength gypsum based self-leveling mortars, what the method adopted is that pressurized aqueous solution legal system is for α high strength gypsum powder; 2) Chinese patent 201110039548.3 discloses a kind of phosphogypsum self-leveling material, but wherein main component is the αsemiwatergypsum adopting the plaster of paris to prepare, in addition, its modified ardealite is the temperature lower calcination 100 ~ 300min at 170 DEG C ± 10 DEG C, the β semi-hydrated gypsum making it dewater completely to obtain.Patent CN102190470A alpha type high-strength gypsum used carries out under autoclaved condition, needs higher facility investment and steam source; Only make use of the phosphogypsum of small part in patent 201110039548.3, be adopt high-temperature calcination technique to be prepared into β semi-hydrated gypsum, do not make full use of phosphogypsum resource, high-temperature calcination is high to equipment requirements, and can consume a large amount of energy.Therefore, adopt constant pressure hydro-thermal method that phosphogypsum is prepared into alpha type high-strength gypsum powder, the production technique being used for being mixed with alpha type high-strength gypsum based self-leveling material has the feature of energy-conserving and environment-protective, utilize phosphogypsum in a large number, improve its added value, the self-leveling material cost produced is low, intensity is high, good fluidity.So far domesticly there is not yet the patent preparing α high strength gypsum based self-leveling material with phosphogypsum.
Summary of the invention
Technical problem to be solved by this invention be provide for above-mentioned prior art a kind of adopt phosphogypsum to prepare α high strength gypsum based self-leveling material and production technique, this technique profit useless high, cost is low, products obtained therefrom performance is good, achieves energy-conserving and environment-protective.
The present invention solves the problems of the technologies described above adopted technical scheme: adopt α high strength gypsum based self-leveling material prepared by phosphogypsum, its feed composition percentage is:
α high strength gypsum powder: 40 ~ 60%; Gather materials: 30 ~ 50%; Cement: 1 ~ 4%; Flyash: 1 ~ 4%;
Re-dispersible glue powder: 2 ~ 4%; Retardant: 0.1 ~ 0.3%; Water reducer: 0.2 ~ 0.75%; Water-holding agent: 0.1 ~ 0.25%;
Air entrapment agent: 0.1 ~ 0.4%; Defoamer: 0.05 ~ 0.15%.
By such scheme, the preparation method of described α high strength gypsum powder is: material modification phosphogypsum, water, medium crystallization agent A and medium crystallization agent B are dropped in reactor, stirring and evenly mixing makes slip, heat to 80 ~ 100 DEG C, then 4 ~ 24h is incubated, carry out constant pressure hydro-thermal reaction, dihydrate gypsum is dewatered and is transformed into α high strength gypsum; Then through hot wash, after solid-liquid separation, α high strength gypsum slurry is obtained, rapidly dry obtained α high strength gypsum powder at 90 ~ 100 DEG C of temperature; Described raw material percentage is modified ardealite: 35 ~ 60%; Water: 28 ~ 50%; Medium crystallization agent A:7 ~ 15%; Medium crystallization agent B:0.01 ~ 0.5%.
By such scheme, described modified ardealite is the byproduct that Wet Processes of Phosphoric Acid emits, wash after lime milk solution modification, flotation to Leaching Properties of Soluble Phosphorus content be not more than 0.6%, soluble fluorine content be not more than 0.4% and organic content be not more than 0.3%, dehydration obtains.
By such scheme, described medium crystallization agent A is calcium chloride.
By such scheme, described medium crystallization agent B is tartrate.
By such scheme, described gathers materials for thin river sand, and fineness modulus controls 2.2 ~ 2.4; Described cement is aluminosulfate cement; Described re-dispersible glue powder is the powder that vinyl acetate between to for plastic and fluoride monomers obtain; Described retardant is any one in citric acid, Citrate trianion, tartrate, polyphosphoric acid salt and SC retardant; Described water reducer is any one in poly carboxylic acid dry powder water reducer, naphthalene water reducer or sulfonated melamine water reducer; Described water-holding agent is any one in methylcellulose gum, Natvosol or carboxymethyl cellulose; Described air entrapment agent is alkyls or alkylated aromatic sulfonic acid class air entrapment agent; Described defoamer is organic silicone oil or nonionogenic tenside.
The production technique of α high strength gypsum based self-leveling material prepared by described employing phosphogypsum, it includes following steps: according to α high strength gypsum powder: 40 ~ 60%; Gather materials: 30 ~ 50%; Cement: 1 ~ 4%; Flyash: 1 ~ 4%; Re-dispersible glue powder: 2 ~ 4%; Retardant: 0.1 ~ 0.3%; Water reducer: 0.2 ~ 0.75%; Water-holding agent: 0.1 ~ 0.25%; Air entrapment agent: 0.1 ~ 0.4%; Defoamer: 0.05 ~ 0.15% feeding; Then by raw material blending, i.e. obtained α high strength gypsum based self-leveling material; Wherein, the preparation method of described α high strength gypsum powder is: material modification phosphogypsum, water, medium crystallization agent A and medium crystallization agent B are dropped in reactor, stirring and evenly mixing makes slip, heat to 80 ~ 100 DEG C, then 4 ~ 24h is incubated, carry out constant pressure hydro-thermal reaction, dihydrate gypsum is dewatered and is transformed into α high strength gypsum; Then through hot wash, after solid-liquid separation, α high strength gypsum slurry is obtained, rapidly dry obtained α high strength gypsum powder at 90 ~ 100 DEG C of temperature; Described raw material percentage is modified ardealite: 35 ~ 60%; Water: 28 ~ 50%; Medium crystallization agent A:7 ~ 15%; Medium crystallization agent B:0.01 ~ 0.5%.
Advantage of the present invention is: the α high strength gypsum based self-leveling material of gained of the present invention is through detecting, reach JC/T1023-2007 " gypsum base gravity flowing levelling mortar " requirement, 30min fluidity loss, presetting period, final setting time, folding strength, ultimate compression strength, shrinking percentage, all meet the requirements.Compared with existing gypsum-based self-leveling material, present invention process make use of industry byproduct phosphogypsum in a large number, by adding environment during two kinds of medium crystallization agents change semi-hydrated gypsum crystallizations, crystal habit is impelled to transform to short cylinder, α high strength gypsum powder is prepared, as the base-material of α high strength gypsum based self-leveling material under the condition that constant pressure hydro-thermal reaction is gentle like this.Crystal formation is short cylinder, so greatly reduce water requirement, intensity improves greatly; Replace ordinary Portland cement with aluminosulfate cement, improve the intensity in early stage of material, thus ensure that construction speed; Increase ball effect by adding mineral additive flyash, thus improve its mobility; Improving the physicals of material by adding the chemical admixtures such as retardant, water reducer, air entrapment agent, such as, controlling time of coagulation, reducing water consumption, improving mobility.This production technique has not only prepared the self-leveling material that a kind of performance is good, added value is high, but also greatly make use of trade waste phosphogypsum, solves a hang-up of phosphorus chemical industry.
Embodiment
In order to understand the present invention better, illustrate content of the present invention further below in conjunction with embodiment, but content of the present invention is not only confined to the following examples.
Embodiment 1:
Adopt phosphogypsum to prepare the production technique of α high strength gypsum based self-leveling material, its each component proportioning is as follows:
1) α high strength gypsum powder is obtained by phosphogypsum:
Modified ardealite: 60%; Water: 29.6%; Calcium chloride: 10%; Tartrate: 0.4%;
Drop in reactor according to above proportioning by raw material, stirring and evenly mixing makes slip, heats to 95 DEG C, is then incubated 5h, carries out constant pressure hydro-thermal reaction, dihydrate gypsum is dewatered and is transformed into α high strength gypsum; Then through 90 DEG C of hot washes, after solid-liquid separation, α high strength gypsum slurry is obtained, rapidly dry obtained α high strength gypsum powder at 100 DEG C;
2) gypsum-based self-leveling material is obtained with α high strength gypsum powder:
α high strength gypsum powder: 60%; Thin river sand: 30.45%; Aluminosulfate cement: 3%; Flyash: 3%; Re-dispersible glue powder: 3%; Citric acid: 0.1%; Sulfonated melamine water reducer: 0.2%; Methylcellulose gum: 0.1%; Sodium dodecylbenzene sulfonate: 0.1%; Organic silicone oil: 0.05%;
Wherein, modified ardealite is the byproduct that Wet Processes of Phosphoric Acid emits, wash after lime milk solution modification, flotation to Leaching Properties of Soluble Phosphorus content be 0.01%, soluble fluorine content be 0.01% and organic content be 0.01%, dewater the phosphogypsum obtained, gather materials for thin river sand, fineness modulus controls 2.2 ~ 2.4, and flyash size controls between 0.08 ~ 0.12mm.Re-dispersible glue powder is the powder that vinyl acetate between to for plastic and fluoride monomers obtain, and mixes according to above proportioning, and namely obtained α high strength gypsum based self-leveling material, then, constructs by after water-cement ratio 0.45 poach.Through detecting, the performance index of this material can meet the requirements in JC/T1023-2007 " gypsum base gravity flowing levelling mortar ".
Embodiment 2:
Adopt phosphogypsum to prepare the production technique of α high strength gypsum based self-leveling material, its each component proportioning is as follows:
1) α high strength gypsum powder is obtained by phosphogypsum: (at the following each labeled data of bound adjustment, mark is blue)
Modified ardealite: 50%; Water: 39.5%; Calcium chloride: 10%; Tartrate: 0.5%;
Drop in reactor according to above proportioning by raw material, stirring and evenly mixing makes slip, heats to 98 DEG C, is then incubated 4h, carries out constant pressure hydro-thermal reaction, dihydrate gypsum is dewatered and is transformed into α high strength gypsum; Then through 95 DEG C of hot washes, after solid-liquid separation, α high strength gypsum slurry is obtained, rapidly dry obtained α high strength gypsum powder at 95 DEG C;
2) gypsum-based self-leveling material is obtained with α high strength gypsum powder:
α high strength gypsum powder: 50%; Thin river sand: 39.1%; Aluminosulfate cement: 3%; Flyash: 3%; Re-dispersible glue powder: 4%; Citric acid: 0.15%; FDN naphthalene water reducer: 0.3%; Methylcellulose gum: 0.15%; Sodium dodecylbenzene sulfonate: 0.2%; Organic silicone oil: 0.1%;
Wherein, modified ardealite is the byproduct that Wet Processes of Phosphoric Acid emits, wash after lime milk solution modification, flotation to Leaching Properties of Soluble Phosphorus content be 0.14%, soluble fluorine content be 0.12% and organic content be 0.08%, dewater the phosphogypsum obtained, gather materials for thin river sand, fineness modulus controls 2.2 ~ 2.4, and flyash size controls between 0.08 ~ 0.12mm.Re-dispersible glue powder is the powder that vinyl acetate between to for plastic and fluoride monomers obtain, and mixes according to above proportioning, and namely obtained α high strength gypsum based self-leveling material, then, constructs by after water-cement ratio 0.44 poach.Through detecting, the performance index of this material can meet the requirements in JC/T1023-2007 " gypsum base gravity flowing levelling mortar ".
Embodiment 3:
Adopt phosphogypsum to prepare the production technique of α high strength gypsum based self-leveling material, its each component proportioning is as follows:
1) α high strength gypsum powder is obtained by phosphogypsum:
Modified ardealite: 40%; Water: 44.8%; Calcium chloride: 15%; Tartrate: 0.2%;
Drop in reactor according to above proportioning by raw material, stirring and evenly mixing makes slip, heats to 92 DEG C, is then incubated 6h, carries out constant pressure hydro-thermal reaction, dihydrate gypsum is dewatered and is transformed into α high strength gypsum; Then through 85 DEG C of hot washes, after solid-liquid separation, α high strength gypsum slurry is obtained, rapidly dry obtained α high strength gypsum powder at 92 DEG C;
2) gypsum-based self-leveling material is obtained with α high strength gypsum powder:
α high strength gypsum powder: 50%; Thin river sand: 38.95%; Aluminosulfate cement: 4%; Flyash: 4%; Re-dispersible glue powder: 2%; SC retardant: 0.2%; FDN naphthalene water reducer: 0.4%; Natvosol: 0.1%; Sodium dodecylbenzene sulfonate: 0.3%; Organic silicone oil: 0.05%;
Modified ardealite is the byproduct that Wet Processes of Phosphoric Acid emits, wash after lime milk solution modification, flotation to Leaching Properties of Soluble Phosphorus content be 0.38%, soluble fluorine content be 0.25% and organic content be 0.16%, dewater the phosphogypsum obtained, gather materials for thin river sand, fineness modulus controls 2.2 ~ 2.4, and flyash size controls between 0.08 ~ 0.12mm.Re-dispersible glue powder is the powder that vinyl acetate between to for plastic and fluoride monomers obtain, and mixes according to above proportioning, and namely obtained α high strength gypsum based self-leveling material, then, constructs by after water-cement ratio 0.42 poach.Through detecting, the performance index of this material can meet the requirements in JC/T1023-2007 " gypsum base gravity flowing levelling mortar ".
Embodiment 4:
Adopt phosphogypsum to prepare the production technique of α high strength gypsum based self-leveling material, its each component proportioning is as follows:
1) α high strength gypsum powder is obtained by phosphogypsum:
Modified ardealite: 50%; Water: 39.9%; Calcium chloride: 10%; Tartrate: 0.1%;
Drop in reactor according to above proportioning by raw material, stirring and evenly mixing makes slip, heats to 90 DEG C, is then incubated 7h, carries out constant pressure hydro-thermal reaction, dihydrate gypsum is dewatered and is transformed into α high strength gypsum; Then through 80 DEG C of hot washes, after solid-liquid separation, α high strength gypsum slurry is obtained, rapidly dry obtained α high strength gypsum powder at 90 DEG C;
2) gypsum-based self-leveling material is obtained with α high strength gypsum powder:
α high strength gypsum powder: 40%; Thin river sand: 47.2%; Aluminosulfate cement: 4%; Flyash: 4%; Re-dispersible glue powder: 4%; Tripoly phosphate sodium STPP: 0.3%; Poly carboxylic acid dry powder water reducer: 0.2%; Methylcellulose gum: 0.15%; Sodium lauryl sulphate K12:0.1%; Organic silicone oil: 0.05%;
Modified ardealite is the byproduct that Wet Processes of Phosphoric Acid emits, wash after lime milk solution modification, flotation to Leaching Properties of Soluble Phosphorus content be 0.43%, soluble fluorine content be 0.30% and organic content be 0.21%, dewater the phosphogypsum obtained, gather materials for thin river sand, fineness modulus controls 2.2 ~ 2.4, and flyash size controls between 0.08 ~ 0.12mm.Re-dispersible glue powder is the powder that vinyl acetate between to for plastic and fluoride monomers obtain, and mixes according to above proportioning, and namely obtained α high strength gypsum based self-leveling material, then, constructs by after water-cement ratio 0.43 poach.Through detecting, the performance index of this material can meet the requirements in JC/T1023-2007 " gypsum base gravity flowing levelling mortar ".
Embodiment 5:
Adopt phosphogypsum to prepare the production technique of α high strength gypsum based self-leveling material, its each component proportioning is as follows:
1) α high strength gypsum powder is obtained by phosphogypsum:
Modified ardealite: 50%; Water: 39.99%; Calcium chloride: 10%; Tartrate: 0.01%;
Drop in reactor according to above proportioning by raw material, stirring and evenly mixing makes slip, heats to 85 DEG C, is then incubated 12h, carries out constant pressure hydro-thermal reaction, dihydrate gypsum is dewatered and is transformed into α high strength gypsum; Then through 85 DEG C of hot washes, after solid-liquid separation, α high strength gypsum slurry is obtained, rapidly dry obtained α high strength gypsum powder at 90 DEG C;
2) gypsum-based self-leveling material is obtained with α high strength gypsum powder:
α high strength gypsum powder: 50%; Thin river sand: 38.85%; Aluminosulfate cement: 3%; Flyash: 3%; Re-dispersible glue powder: 4%; SC retardant: 0.2%; Sulfonated melamine water reducer: 0.3%; Carboxymethyl cellulose: 0.1%; Sodium dodecylbenzene sulfonate: 0.4%; Organic silicone oil: 0.15%;
Modified ardealite is the byproduct that Wet Processes of Phosphoric Acid emits, wash after lime milk solution modification, flotation to Leaching Properties of Soluble Phosphorus content be 0.45%, soluble fluorine content be 0.32% and organic content be 0.24%, dewater the phosphogypsum obtained, gather materials for thin river sand, fineness modulus controls 2.2 ~ 2.4, and flyash size controls between 0.08 ~ 0.12mm.Re-dispersible glue powder is the powder that vinyl acetate between to for plastic and fluoride monomers obtain, and mixes according to above proportioning, and namely obtained α high strength gypsum based self-leveling material, then, constructs by after water-cement ratio 0.44 poach.Through detecting, the performance index of this material can meet the requirements in JC/T1023-2007 " gypsum base gravity flowing levelling mortar ".
Test according to standard JC/T1023-2007 " gypsum base gravity flowing levelling mortar " some salient featuress to the gypsum-based self-leveling material that the present invention obtains, result is as following table:
Claims (6)
1. adopt α high strength gypsum based self-leveling material prepared by phosphogypsum, its feed composition percentage is:
α high strength gypsum powder: 40 ~ 60%; Gather materials: 30 ~ 50%; Cement: 1 ~ 4%; Flyash: 1 ~ 4%;
Re-dispersible glue powder: 2 ~ 4%; Retardant: 0.1 ~ 0.3%; Water reducer: 0.2 ~ 0.75%; Water-holding agent: 0.1 ~ 0.25%;
Air entrapment agent: 0.1 ~ 0.4%; Defoamer: 0.05 ~ 0.15%;
The preparation method of described α high strength gypsum powder is: material modification phosphogypsum, water, medium crystallization agent A and medium crystallization agent B are dropped in reactor, stirring and evenly mixing makes slip, and described medium crystallization agent A is calcium chloride; Described medium crystallization agent B is tartrate; Heat to 80 ~ 100 DEG C, be then incubated 4 ~ 24h, carry out constant pressure hydro-thermal reaction, dihydrate gypsum is dewatered and is transformed into α high strength gypsum; Then through hot wash, after solid-liquid separation, α high strength gypsum slurry is obtained, rapidly dry obtained α high strength gypsum powder at 90 ~ 100 DEG C of temperature; Described raw material percentage is modified ardealite: 35 ~ 60%; Water: 28 ~ 50%; Medium crystallization agent A:7 ~ 15%; Medium crystallization agent B:0.01 ~ 0.5%.
2. the α high strength gypsum based self-leveling material prepared of employing phosphogypsum according to claim 1, it is characterized in that described modified ardealite is the byproduct that Wet Processes of Phosphoric Acid emits, wash after lime milk solution modification, flotation to Leaching Properties of Soluble Phosphorus content be not more than 0.6%, soluble fluorine content be not more than 0.4% and organic content be not more than 0.3%, dehydration obtains.
3. the α high strength gypsum based self-leveling material prepared of employing phosphogypsum according to claim 1, is characterized in that: described gathers materials for thin river sand, and fineness modulus controls 2.2 ~ 2.4; Described cement is aluminosulfate cement; Described re-dispersible glue powder is the powder that vinyl acetate between to for plastic and fluoride monomers obtain; Described retardant is any one in citric acid, Citrate trianion, tartrate, polyphosphoric acid salt and SC retardant; Described water reducer is any one in poly carboxylic acid dry powder water reducer, naphthalene water reducer or sulfonated melamine water reducer; Described water-holding agent is any one in methylcellulose gum, Natvosol or carboxymethyl cellulose; Described air entrapment agent is alkyls or alkylated aromatic sulfonic acid class air entrapment agent; Described defoamer is organic silicone oil or nonionogenic tenside.
4. the production technique of α high strength gypsum based self-leveling material prepared of employing phosphogypsum according to claim 1, it includes following steps: according to α high strength gypsum powder: 40 ~ 60%; Gather materials: 30 ~ 50%; Cement: 1 ~ 4%; Flyash: 1 ~ 4%; Re-dispersible glue powder: 2 ~ 4%; Retardant: 0.1 ~ 0.3%; Water reducer: 0.2 ~ 0.75%; Water-holding agent: 0.1 ~ 0.25%; Air entrapment agent: 0.1 ~ 0.4%; Defoamer: 0.05 ~ 0.15% feeding; Then by raw material blending, i.e. obtained α high strength gypsum based self-leveling material; Wherein, the preparation method of described α high strength gypsum powder is: material modification phosphogypsum, water, medium crystallization agent A and medium crystallization agent B are dropped in reactor, stirring and evenly mixing makes slip, and described medium crystallization agent A is calcium chloride, and described medium crystallization agent B is tartrate; Heat to 80 ~ 100 DEG C, be then incubated 4 ~ 24h, carry out constant pressure hydro-thermal reaction, dihydrate gypsum is dewatered and is transformed into α high strength gypsum; Then through hot wash, after solid-liquid separation, α high strength gypsum slurry is obtained, rapidly dry obtained α high strength gypsum powder at 90 ~ 100 DEG C of temperature; Described raw material percentage is modified ardealite: 35 ~ 60%; Water: 28 ~ 50%; Medium crystallization agent A:7 ~ 15%; Medium crystallization agent B:0.01 ~ 0.5%.
5. the production technique of α high strength gypsum based self-leveling material prepared of employing phosphogypsum according to claim 4, it is characterized in that described modified ardealite is the byproduct that Wet Processes of Phosphoric Acid emits, wash after lime milk solution modification, flotation to Leaching Properties of Soluble Phosphorus content be not more than 0.6%, soluble fluorine content be not more than 0.4% and organic content be not more than 0.3%, dehydration obtains.
6. the production technique of α high strength gypsum based self-leveling material prepared of employing phosphogypsum according to claim 4, is characterized in that: described gathers materials for thin river sand, and fineness modulus controls 2.2 ~ 2.4; Described cement is aluminosulfate cement; Described re-dispersible glue powder is the powder that vinyl acetate between to for plastic and fluoride monomers obtain; Described retardant is any one in citric acid, Citrate trianion, tartrate, polyphosphoric acid salt and SC retardant; Described water reducer is any one in poly carboxylic acid dry powder water reducer, naphthalene water reducer or sulfonated melamine water reducer; Described water-holding agent is any one in methylcellulose gum, Natvosol or carboxymethyl cellulose; Described air entrapment agent is alkyls or alkylated aromatic sulfonic acid class air entrapment agent; Described defoamer is organic silicone oil or nonionogenic tenside.
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