CN101429000A - Composite board produced with waste and old plastic and industrial gypsum, and producing method thereof - Google Patents

Composite board produced with waste and old plastic and industrial gypsum, and producing method thereof Download PDF

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Publication number
CN101429000A
CN101429000A CNA2008103028338A CN200810302833A CN101429000A CN 101429000 A CN101429000 A CN 101429000A CN A2008103028338 A CNA2008103028338 A CN A2008103028338A CN 200810302833 A CN200810302833 A CN 200810302833A CN 101429000 A CN101429000 A CN 101429000A
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China
Prior art keywords
waste
plastics
industrial
used plastics
plastic
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Granted
Application number
CNA2008103028338A
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Chinese (zh)
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CN101429000B (en
Inventor
陈前林
刘彤
曾光
杨光君
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Guizhou University
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Guizhou University
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Priority to CN200810302833A priority Critical patent/CN101429000B/en
Publication of CN101429000A publication Critical patent/CN101429000A/en
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Publication of CN101429000B publication Critical patent/CN101429000B/en
Expired - Fee Related legal-status Critical Current
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14Compositions 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
    • C04B28/142Compositions 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 synthetic or waste calcium sulfate cements
    • C04B28/144Compositions 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 synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14Compositions 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
    • C04B28/142Compositions 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 synthetic or waste calcium sulfate cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/40Porous or lightweight materials
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

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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)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Abstract

The invention discloses a composite board produced by waste plastics and industrial gypsum and a production method thereof. The composite board is prepared by the waste plastics and the industrial gypsum according to certain weight ratio. The invention adopts waste plastics such as waste polypropylene plastic, waste polyethylene plastic, waste polystyrene plastic, waste polyvinyl chloride plastic and so on discarded by industrial production and human life and the industrial gypsum as main raw materials to produce the composite board through the crushing and hot pressing, the composite board achieves the standard of the national building formwork, reduces the pollution of the industrial gypsum and plastic wastes to the environment, can also be used to substitute a wood building formwork or a steel building formwork which is widely used for the prior building construction, has low production cost, light weight, high strength, shock resistance, and easy mold stripping, can turn the harmful into the beneficial and turn waste into valuables, and greatly accelerate the progress of waste resource recovery in our country.

Description

Composition board that waste or used plastics and industrial gypsum are made and production method thereof
Technical field
Building template and the production method thereof used when the present invention relates to a kind of deposit concrete, particularly a kind of waste or used plastics and industrial gypsum of adopting is composition board and the production method thereof that raw material is made, and belongs to building material field.
Background technology
At present, the quantity discharged of China's industrial gypsum increases year by year, and these industrial gypsums except partly being used for manufacture gypsum brick, plasterboard, the compound manure, much are stacked at the storage ash field of industrial gypsum at present with ining addition, not only occupy the soil, also can cause serious environmental to pollute.And growing along with China's plastic material production capacity and consumption, the plastic garbage output that makes waste plastic form is more and more, causes serious " white pollution ".And on the other hand, in construction work, need use a large amount of wooden building templates or steel building template during deposit concrete, the form work engineering expense generally can account for 20~30% of reinforced concrete work expense.
Summary of the invention
Technical problem to be solved by this invention is that providing a kind of is composition board and the production method thereof that raw material is made with waste or used plastics and industrial gypsum, thereby when reducing the pollution of industrial gypsum and waste or used plastics, reduces the form cost of construction work and use.
For solving the problems of the technologies described above, technical scheme of the present invention is as follows: the composition board that waste or used plastics and industrial gypsum are made.It is to make for 10~60 parts with 40~90 parts of waste or used plastics and industrial gypsum; Wherein waste or used plastics is formed by any 2 kinds, 3 kinds or 4 kinds in waste polypropylene plastic, waste polyethylene plastics, waste and old polystyrene plastics and four kinds of waste or used plastics of waste vinylene chloride plastic, contains 0~60 part of 0~70 part of waste polypropylene plastic, 0~60 part in waste polyethylene plastics, 0~60 part of waste and old polystyrene plastics or waste vinylene chloride plastic in per 100 parts of waste or used plastics.
The composition board that above-mentioned waste or used plastics and industrial gypsum are made, it is to make for 20~40 parts with 60~80 parts of waste or used plastics and industrial gypsum; Wherein waste or used plastics is formed by any 2~4 kinds in waste polypropylene plastic, waste polyethylene plastics, waste and old polystyrene plastics and four kinds of waste or used plastics of waste vinylene chloride plastic, contains 0~50 part of 0~60 part of waste polypropylene plastic, 0~60 part in waste polyethylene plastics, 0~50 part of waste and old polystyrene plastics or waste vinylene chloride plastic in per 100 parts of waste or used plastics.
The composition board that aforesaid waste or used plastics and industrial gypsum are made, described waste polypropylene plastic are the polypropylene articles that abandoned of industrial production and human lives such as medical apparatus, fishing net, woven bag, disposable water cup, polypropylene pipe and section bar, battery jar.
The composition board that aforesaid waste or used plastics and industrial gypsum are made, described waste polyethylene plastics are polyethylene products such as agricultural film, toy packaging, food bag, refuse bag, polyvinyl piping materials and section bars that industrial production and human lives are abandoned.
The composition board that aforesaid waste or used plastics and industrial gypsum are made, described waste and old polystyrene plastics are modified styrene polymer such as bubble wrap dish, rigid foam or the handle that industrial production and human lives are abandoned.
The composition board that aforesaid waste or used plastics and industrial gypsum are made, described waste vinylene chloride plastic is the hard that abandoned of industrial production and human lives or soft PVC goods such as tubing, door-window section bar, sheet material class extruded product, and tube stub, electric parts class moulding and extrude bottle series products or automotive trim product, handbag, film, label, electric wire or the medical product that blows type.
The composition board that aforesaid waste or used plastics and industrial gypsum are made, described industrial gypsum are phosphogypsum, desulfurated plaster or the fluorgypsums that discharges in the industrial production.
The production method of the composition board that aforesaid waste or used plastics and industrial gypsum are made is made by following step;
A, waste or used plastics classification is crushed to below the 30mm, mixes with industrial gypsum, the A product;
B, the A product are heated to 180 ℃~240 ℃ after, annotate or calendering formation gets product by mould; Or the A product are put into mould, be heated to 180 ℃~240 ℃ after founding or die casting and finished product.
Compared with prior art, the waste polypropylene plastic that the present invention adopts industrial production and human lives to be abandoned, the waste polyethylene plastics, waste or used plastics such as waste and old polystyrene plastics and waste vinylene chloride plastic and industrial gypsum are main raw material, make high-intensity composition board by batching and moulding, both reduced the pollution of industrial gypsum and plastic refuse to environment, increased novel material for construction work again, the composition board of the present invention's preparation reaches the standard of national building template, can be used for replacing widely used wooden building template or steel building template in the present building operation, low production cost not only, in light weight, the intensity height, shock-resistant, the easily demoulding, and can " turn harm into good; turn waste into wealth ", accelerate the process of China's changing rejected material to useful resource greatly.
Embodiment
Embodiment 1.Make composition board by following step.
A, the industrial gypsum that the waste vinylene chloride plastic classification of the waste and old polystyrene plastics of the waste polyethylene plastics of the waste polypropylene plastic of 350kg, 200kg, 100kg and 70kg is crushed to behind the 25mm with 250kg mix, the A product;
B, the A product are heated to 200 ℃ after, the calendering formation technology by routine promptly makes finished product.
Above-mentioned waste polypropylene plastic is polypropylene articles such as medical apparatus, fishing net, woven bag, disposable water cup, polypropylene pipe and section bar, the battery jar etc. that industrial production and human lives abandon; The waste polyethylene plastics are polyethylene products such as agricultural film, toy packaging, food bag, refuse bag, polyvinyl piping materials and section bars etc. that industrial production and human lives abandon; Waste and old polystyrene plastics is modified styrene polymer such as bubble wrap dish, rigid foam or the handle etc. that industrial production and human lives abandon; Waste vinylene chloride plastic is extruded products such as the hard that abandons of industrial production and human lives or soft PVC goods such as tubing, door-window section bar, sheet material, and moulding such as tube stub, electric parts and extrude the bottle series products that blows type or automotive trim product, handbag, film, label, electric wire, medical product etc.; Industrial gypsum is the phosphogypsum that discharges in the industrial production, desulfurated plaster, fluorgypsum etc.
Embodiment 2.Make composition board by following step.
A, the industrial gypsum that the waste and old polystyrene plastics classification of the waste polyethylene plastics of the waste polypropylene plastic of 450kg, 200kg, 150kg is crushed to behind the 20mm with 400kg mix, the A product;
B, the A product are put into mould, make finished product through die casting after being heated to 240 ℃.
Above-mentioned waste polypropylene plastic is polypropylene articles such as medical apparatus, fishing net, woven bag, disposable water cup, polypropylene pipe and section bar, the battery jar etc. that industrial production and human lives abandon; The waste polyethylene plastics are polyethylene products such as agricultural film, toy packaging, food bag, refuse bag, polyvinyl piping materials and section bars etc. that industrial production and human lives abandon; Waste and old polystyrene plastics is modified styrene polymer such as bubble wrap dish, rigid foam or the handle etc. that industrial production and human lives abandon; Industrial gypsum is the phosphogypsum that discharges in the industrial production, desulfurated plaster, fluorgypsum etc.
Embodiment 3.Make composition board by following step.
A, the industrial gypsum that the waste vinylene chloride plastic classification of the waste polyethylene plastics of the waste polypropylene plastic of 500kg, 250kg, 50kg is crushed to behind the 15mm with 450kg mix, the A product;
B, the A product are put into mould, make finished product through die casting after being heated to 240 ℃.
Above-mentioned waste polypropylene plastic is polypropylene articles such as medical apparatus, fishing net, woven bag, disposable water cup, polypropylene pipe and section bar, the battery jar etc. that industrial production and human lives abandon; The waste polyethylene plastics are polyethylene products such as agricultural film, toy packaging, food bag, refuse bag, polyvinyl piping materials and section bars etc. that industrial production and human lives abandon; Waste vinylene chloride plastic is extruded products such as the hard that abandons of industrial production and human lives or soft PVC goods such as tubing, door-window section bar, sheet material, and moulding such as tube stub, electric parts and extrude the bottle series products that blows type or automotive trim product, handbag, film, label, electric wire, medical product etc.; Industrial gypsum is the phosphogypsum that discharges in the industrial production, desulfurated plaster, fluorgypsum etc.
Embodiment 4.Make composition board by following step.
A, the industrial gypsum that the waste polyethylene plastics classification of the waste and old polystyrene plastics of 300kg and 300kg is crushed to behind the 20mm with 250kg mix, the A product;
B, the A product are heated to 220 ℃ after, annotate technology by the mould of routine and promptly make finished product.
Above-mentioned waste and old polystyrene plastics is modified styrene polymer such as bubble wrap dish, rigid foam or the handle etc. that industrial production and human lives abandon; The waste polyethylene plastics are polyethylene products such as agricultural film, toy packaging, food bag, refuse bag, polyvinyl piping materials and section bars etc. that industrial production and human lives abandon; Industrial gypsum is the phosphogypsum that discharges in the industrial production, desulfurated plaster, fluorgypsum etc.
Embodiment 5.Make composition board by following step.
A, the industrial gypsum that the waste polyethylene plastics classification of the waste polypropylene plastic of 300kg and 200kg is crushed to behind the 20mm with 200kg mix, the A product;
B, the A product are heated to 180 ℃ after, annotate technology by the mould of routine and promptly make finished product.
Above-mentioned waste polypropylene plastic is polypropylene articles such as medical apparatus, fishing net, woven bag, disposable water cup, polypropylene pipe and section bar, the battery jar etc. that industrial production and human lives abandon; The waste polyethylene plastics are polyethylene products such as agricultural film, toy packaging, food bag, refuse bag, polyvinyl piping materials and section bars etc. that industrial production and human lives abandon; Industrial gypsum is the phosphogypsum that discharges in the industrial production, desulfurated plaster, fluorgypsum etc.

Claims (8)

  1. The composition board that [claim 1] a kind of waste or used plastics and industrial gypsum are made is characterized in that: it is with 10~60 parts of 40~90 parts of waste or used plastics and industrial gypsums, mixes after heat and is pressed into; Wherein waste or used plastics is formed by any 2~4 kinds in waste polypropylene plastic, waste polyethylene plastics, waste and old polystyrene plastics and four kinds of waste or used plastics of waste vinylene chloride plastic, contains 0~60 part of 0~70 part of waste polypropylene plastic, 0~60 part in waste polyethylene plastics, 0~60 part of waste and old polystyrene plastics or waste vinylene chloride plastic in per 100 parts of waste or used plastics.
  2. The composition board that [claim 2] waste or used plastics according to claim 1 and industrial gypsum are made is characterized in that: it is to make for 20~40 parts with 60~80 parts of waste or used plastics and industrial gypsum; Wherein waste or used plastics is formed by any 2~4 kinds in waste polypropylene plastic, waste polyethylene plastics, waste and old polystyrene plastics and four kinds of waste or used plastics of waste vinylene chloride plastic, contains 0~50 part of 0~60 part of waste polypropylene plastic, 0~60 part in waste polyethylene plastics, 0~50 part of waste and old polystyrene plastics or waste vinylene chloride plastic in per 100 parts of waste or used plastics.
  3. The composition board that [claim 3] waste or used plastics according to claim 2 and industrial gypsum are made is characterized in that: described waste polypropylene plastic is the polypropylene articles that abandoned of industrial production and human lives such as medical apparatus, fishing net, woven bag, disposable water cup, polypropylene pipe and section bar, battery jar.
  4. The composition board that [claim 4] waste or used plastics according to claim 2 and industrial gypsum are made is characterized in that: described waste polyethylene plastics are polyethylene products such as agricultural film, toy packaging, food bag, refuse bag, polyvinyl piping materials and section bars that industrial production and human lives are abandoned.
  5. The composition board that [claim 5] waste or used plastics according to claim 2 and industrial gypsum are made is characterized in that: described waste and old polystyrene plastics is modified styrene polymer such as bubble wrap dish, rigid foam or the handle that industrial production and human lives are abandoned.
  6. The composition board that [claim 6] waste or used plastics according to claim 2 and industrial gypsum are made, it is characterized in that: described waste vinylene chloride plastic is the hard that abandoned of industrial production and human lives or soft PVC goods such as tubing, door-window section bar, sheet material class extruded product, and tube stub, electric parts class moulding and extrude bottle series products or automotive trim product, handbag, film, label, electric wire or the medical product that blows type.
  7. The composition board that [claim 7] waste or used plastics according to claim 2 and industrial gypsum are made is characterized in that: described industrial gypsum is phosphogypsum, desulfurated plaster or the fluorgypsum that discharges in the industrial production.
  8. The production method of the composition board that [claim 8] made as any described waste or used plastics of claim and industrial gypsum in the claim 1~7 is characterized in that: make by following step;
    A, waste or used plastics classification is crushed to below the 30mm, mixes with industrial gypsum, the A product;
    B, the A product are heated to 180 ℃~240 ℃ after, annotate or calendering formation gets product by mould; Or the A product are put into mould, be heated to 180 ℃~240 ℃ after founding or die casting and finished product.
CN200810302833A 2008-07-21 2008-07-21 Composite board produced with waste and old plastic and industrial gypsum, and producing method thereof Expired - Fee Related CN101429000B (en)

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Application Number Priority Date Filing Date Title
CN200810302833A CN101429000B (en) 2008-07-21 2008-07-21 Composite board produced with waste and old plastic and industrial gypsum, and producing method thereof

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CN101429000A true CN101429000A (en) 2009-05-13
CN101429000B CN101429000B (en) 2012-08-29

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103130481A (en) * 2011-12-01 2013-06-05 黄靓 Composite building thermal insulation material and production method thereof
CN103232722A (en) * 2013-04-27 2013-08-07 衡阳建祥装饰材料有限公司 Method for producing bionic composite board through recycling waste macromolecular products
JP2013216534A (en) * 2012-04-06 2013-10-24 Nichiha Corp Inorganic board
CN103613852A (en) * 2013-10-31 2014-03-05 浙江俊尔新材料股份有限公司 Polypropylene composite material prepared from waste battery jars, preparation method and applications thereof
CN104029311A (en) * 2014-05-29 2014-09-10 北京东升广源环保科技有限公司 Production system of composite material
RU2535849C1 (en) * 2013-12-24 2014-12-20 Юлия Алексеевна Щепочкина Raw mix for making construction materials and items
CN104589493A (en) * 2015-01-14 2015-05-06 贵州友仁建材科技开发有限公司 Manufacturing method of high-strength separating wall phosphate gypsum masonry and die
CN104909680A (en) * 2014-03-10 2015-09-16 重庆圣峤宣环保科技有限公司 Phosphogypsum calcium sulfate paper preparation method
CN105111788A (en) * 2015-09-24 2015-12-02 贵州大学 Modified antimony tailings slag, application thereof and composite board formed by same and waste plastic
CN105331013A (en) * 2015-11-29 2016-02-17 贵州开磷集团股份有限公司 Method for producing PVC pipes by taking phosphogypsum as filler
CN105331011A (en) * 2015-11-29 2016-02-17 贵州开磷集团股份有限公司 Filler for PVC production and preparation method thereof
CN109877959A (en) * 2019-04-23 2019-06-14 马小兵 Cast-in-place wall template manufacture and cast-in-place wall form
CN111620646A (en) * 2020-04-27 2020-09-04 中建四局深圳实业有限公司 Manufacturing method of plastic formwork for building by effectively utilizing phosphogypsum waste

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1061179A (en) * 1991-08-22 1992-05-20 中卫县城关建筑工程公司 Gypsum light aggregate building block and production method thereof
US6881367B1 (en) * 2000-11-06 2005-04-19 Elk Composite Building Products, Inc. Composite materials, articles of manufacture produced therefrom, and methods for their manufacture
CN1114572C (en) * 2000-11-27 2003-07-16 中国科学院长春应用化学研究所 Die press method for producing composite products of used plastics and powdered coal ash

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103130481A (en) * 2011-12-01 2013-06-05 黄靓 Composite building thermal insulation material and production method thereof
JP2013216534A (en) * 2012-04-06 2013-10-24 Nichiha Corp Inorganic board
CN103232722A (en) * 2013-04-27 2013-08-07 衡阳建祥装饰材料有限公司 Method for producing bionic composite board through recycling waste macromolecular products
CN103232722B (en) * 2013-04-27 2017-02-08 衡阳建祥新材料有限公司 Method for producing bionic composite board through recycling waste macromolecular products
CN103613852B (en) * 2013-10-31 2016-06-08 中广核俊尔新材料有限公司 PP composite material prepared by the useless battery jar material of utilization and its preparation method and application
CN103613852A (en) * 2013-10-31 2014-03-05 浙江俊尔新材料股份有限公司 Polypropylene composite material prepared from waste battery jars, preparation method and applications thereof
RU2535849C1 (en) * 2013-12-24 2014-12-20 Юлия Алексеевна Щепочкина Raw mix for making construction materials and items
CN104909680B (en) * 2014-03-10 2017-08-25 王安全 A kind of ardealite calcium sulfate Preparation Method made of paper
CN104909680A (en) * 2014-03-10 2015-09-16 重庆圣峤宣环保科技有限公司 Phosphogypsum calcium sulfate paper preparation method
CN104029311A (en) * 2014-05-29 2014-09-10 北京东升广源环保科技有限公司 Production system of composite material
CN104589493B (en) * 2015-01-14 2017-02-22 贵州友仁建材科技开发有限公司 Manufacturing method of high-strength separating wall phosphate gypsum masonry and die
CN104589493A (en) * 2015-01-14 2015-05-06 贵州友仁建材科技开发有限公司 Manufacturing method of high-strength separating wall phosphate gypsum masonry and die
CN105111788A (en) * 2015-09-24 2015-12-02 贵州大学 Modified antimony tailings slag, application thereof and composite board formed by same and waste plastic
CN105111788B (en) * 2015-09-24 2017-05-10 贵州大学 Modified antimony tailings slag, application thereof and composite board formed by same and waste plastic
CN105331011A (en) * 2015-11-29 2016-02-17 贵州开磷集团股份有限公司 Filler for PVC production and preparation method thereof
CN105331013A (en) * 2015-11-29 2016-02-17 贵州开磷集团股份有限公司 Method for producing PVC pipes by taking phosphogypsum as filler
CN109877959A (en) * 2019-04-23 2019-06-14 马小兵 Cast-in-place wall template manufacture and cast-in-place wall form
CN111620646A (en) * 2020-04-27 2020-09-04 中建四局深圳实业有限公司 Manufacturing method of plastic formwork for building by effectively utilizing phosphogypsum waste

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