CN103642295A - Method for preparing caulking gypsum putty powder from flue gas desulfurization gypsum - Google Patents

Method for preparing caulking gypsum putty powder from flue gas desulfurization gypsum Download PDF

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CN103642295A
CN103642295A CN201310611406.9A CN201310611406A CN103642295A CN 103642295 A CN103642295 A CN 103642295A CN 201310611406 A CN201310611406 A CN 201310611406A CN 103642295 A CN103642295 A CN 103642295A
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gypsum
flue gas
powder
putty powder
preparing
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CN201310611406.9A
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CN103642295B (en
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关杰
周洪羽
袁昊
任浩华
苏瑞景
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Zhejiang Gudeyou Technology Co ltd
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Shanghai Polytechnic University
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Abstract

The invention discloses a method for preparing caulking gypsum putty powder from flue gas desulfurization gypsum. The method comprises the following steps: crushing the waste desulfurization gypsum till the particles with granularity of 25-35um are over 80 percent, and performing high-temperature calcining, so that CaSO4.2H2O loses crystal water to form CaSO4.1/2H2O or CaSO4; uniformly stirring and mixing the following components at one time in percentage by weight: 0.5-3 percent of regulator, 0.5-1.5 percent of enhancer, 0.1-0.6 percent of water-retaining agent, 0.3-0.5 percent of retarder, 0.2-0.5 percent of photocatalyst and 0.2-0.25 percent of adhesive; adding 80-87wt% of desulfurization gypsum powder and 10-20wt% of calcium magnesium powder into the obtained mixture, and performing secondary stirring and mixing, thus obtaining the caulking gypsum putty powder. The prepared product has the advantages of environment friendliness, cracking resistance, availability and low cost, and more importantly has the characteristic of degrading formaldehyde and other volatile organic compounds.

Description

A kind of method of preparing filleting gypsum putty powder from desulfurized gesso of flue gas
Technical field
The present invention relates to a kind of method of preparing filleting gypsum putty powder from desulfurized gesso of flue gas, belong to material of construction preparing technical field.
Background technology
Desulfurated plaster is a kind of of industry byproduct gypsum, is the byproduct of power-plant flue gas wet desulphurization, and its composition and the plaster of paris are basic identical, and purity and fineness are higher.At present, the quantity discharged of China's desulfurated plaster has approached 100,000,000 tons/year, with being precious, abandons for suffering from.
At present, China's desulfurated plaster utilization ratio is only 30%, and a large amount of desulfurated plasters are stacked or fill out sea, take a large amount of soils and soil is brought to secondary pollution.Developed country pays much attention to the recycling of such waste, and Japanese desulfurated plaster utilization ratio approaches 100%; The nearly all desulfurated plaster of Germany is all used for preparing building materials of gypsum, and utilization ratio is in 90% left and right; U.S.'s desulfurated plaster comprehensive utilization ratio is also reached for more than 75%.Therefore, the recycling of desulfurated plaster is the major issue in resource and environment field.
Filleting gypsum putty powder is to adopt high-quality terra alba, a kind of wall surfacing material that high-quality glue paste and organic additive etc. are composited.Product is located filleting, repairing and leveling for concrete, wooden boards, plasterboard, inner wall surface, top ceiling, negative and positive angle, Thistle board etc.Because do not have the usage quantity of gesso large, once once do not paid attention to, after adding glue and stir, directly use some employing terra albas, there are the quality problems such as the low and easy be full of cracks of intensity.
Traditional filleting gypsum putty powder is that employing desulfurated plaster is main raw material, directly adds water and prepares, and product bad adhesion, be full of cracks is easy to come off; Also the employing gypsum having adds tackiness agent to be added Mierocrystalline cellulose again and makes, and in performance, some improves, but result of use is very poor; Also the employing water-holding agent, binding agent and the methyl cellulose ethers that have, although the auxiliary agent adding is no more than five kinds, cost is higher, and in performance, the source due to desulfurated plaster does not resemble plaster of paris stable in properties, causes the reliability variation of product.
Summary of the invention
For overcoming above-mentioned defect, the invention discloses a kind of method of preparing filleting gypsum putty powder from desulfurized gesso of flue gas.Filleting gypsum prepared by the inventive method has stronger cohesive force and is difficult for be full of cracks, and preparation method is simple, easy to use, environmental protection, and effectively Eradicates is except features such as formaldehyde, benzene class, TVOC and sterilizations.
Technical solution of the present invention is achieved in that
1) waste desulfurated plaster is crushed to 25-35 μ m and reaches more than 80%, then carry out high-temperature calcination, make CaSO 42H 2o loses crystal water and becomes CaSO41/2H2O or CaSO4,, obtain desulfurization gypsum powder;
2) according to weight percent by adjusting agent 0.5-3% toughener 0.5-1.5%, water-holding agent 0.1-0.6%, retardant 0.3-0.5%, photocatalyst 0.2-0.5%, binding agent 0.2-0.25%, be once uniformly mixed;
3) according to weight percent, desulfurization gypsum powder 80-87%, calcium-magnesium powder 10-20% are added in the mixture that step (B) obtains, carry out secondary stirring mixing, obtain filleting gypsum putty powder.
Described adjusting agent is sulfonate fire retardant.
Described toughener is borax.
Described water-holding agent is Natvosol ethyl ether.
Described retardant is polymeric amide.
Described tackiness agent is polyvinyl alcohol.
Described photocatalyst is nano photo-catalytic formaldehyde remover, is to adopt 50 nanometers following by TiO 2load ceramic crystal processes.
Technique of the present invention has increased auxiliary agent kind and has optimized product proportioning, added free of contamination nano photo-catalytic material, can be under visible light condition or in the inadequate situation of light can degradation of formaldehyde, pollutent and the poisonous and harmful organic compound such as benzene,toluene,xylene, ammonia, TVOC, that the product making has is antibacterial, smelly eliminating, mildew-resistant, the purifying air performance such as antifouling, can be permanently effective solidify in substrate surface, gives full play to its decomposability and purifying air performance.In reaction process, photocatalyst itself can not change and loss, can continual purifying contaminated thing under the irradiation of light, there is lasting, continuous action of time.
Wherein, the nano photo-catalytic formaldehyde remover that invention adopts is following by TiO by 50 nanometers 2load ceramic crystal processes.This products characteristics is:
1) pollution-free: formaldehyde complete oxidation is decomposed into water and carbonic acid gas, and it does not exist and adsorbs the problems such as saturated.
2) degradation rate is high: under room temperature state, the transformation efficiency of its PARA FORMALDEHYDE PRILLS(91,95) is more than 95%, does not produce secondary pollution.
3) weather resistance: the photocatalyst adding itself can not change and loss, can continual decomposing pollutant.
The features such as this product has environmental protection, setting time prolongation, cohesive force is strong, water tolerance is good, intensity is high, not easy to crack.
Filleting gypsum prepared by the inventive method has stronger cohesive force and is difficult for be full of cracks, and preparation method is simple, easy to use, environmental protection, and setting time extends, water tolerance is good, the high effectively Eradicates of intensity removes the features such as formaldehyde, benzene class, TVOC and sterilization.
Accompanying drawing explanation
Fig. 1 is for to prepare filleting gypsum putty powder process flow sheet from desulfurized gesso of flue gas.
Embodiment
Be below the relevant explanation to the embodiment of the present invention, but the present embodiment can not be for limiting the present invention, every employing similarity method of the present invention and similar variation thereof, all should list protection scope of the present invention in.
Adjusting agent-sulfonate fire retardant that the embodiment of the present invention is used; Toughener-borax; Water-holding agent-Natvosol ethyl ether; Retardant-polymeric amide; Tackiness agent-polyvinyl alcohol; Photocatalyst-nano photo-catalytic formaldehyde remover.
From desulfurized gesso of flue gas, prepare the technical process of filleting gypsum putty powder as shown in Figure 1.
[embodiment 1]
The preparation technology of the present embodiment is as follows:
1) proportioning raw materials: be that 1.0% toughener is 0.5% according to weight percent adjusting agent, water-holding agent is 0.2%, retardant is 0.3%, photocatalyst is 0.2%, binding agent 0.2%, desulfurated plaster 87%, other are calcium-magnesium powder approximately 10%.
2) auxiliary agent preparation: adjusting agent, toughener, water-holding agent, retardant, photocatalyst, binding agent mixes according to weight proportion, then above mixing raw material is sent into stirrer, once stirs and mixes.
3) finished product is synthetic: according to weight percent, add desulfurization gypsum powder 87%, calcium-magnesium powder 10% to step 2) in the mixture that obtains, carry out secondary stirring mixing, by twice, fully mix, obtain filleting gypsum putty powder finished product, can directly use.
The filleting terra alba of preparing according to the present embodiment, except meeting People's Republic of China's building material industry standard (JC/T2075-2011).Specific targets are: presetting period 50-70min; Final setting time 60-90min; Water retention >=90%, tensile strength >=0.60MPa, ultimate compression strength >=3.0MPa.
[embodiment 2]
The preparation technology of the present embodiment is as follows:
1) proportioning raw materials: be 2.0% according to weight percent adjusting agent, toughener is 1.0%, water-holding agent is 0.4%, retardant is 0.4%, photocatalyst 0.2%, binding agent 0.25%, desulfurated plaster 80%, calcium-magnesium powder is 15%.
2) auxiliary agent preparation: adjusting agent, toughener, water-holding agent, retardant, photocatalyst, binding agent mixes according to weight proportion, then above mixing raw material is sent into stirrer, once stirs, fully stirring and evenly mixing;
3) finished product is synthetic: according to weight percent, add desulfurization gypsum powder 80%, calcium-magnesium powder 15% to step 2) in the mixture that obtains, carry out secondary stirring mixing, by twice, fully mix, obtain filleting gypsum putty powder finished product, can directly use.
The filleting gypsum of preparing according to the present embodiment, except meeting People's Republic of China's building material industry standard (JC/T2075-2011).Specific targets are: presetting period 50-70min; Final setting time 60-90min; Water retention >=90%, tensile strength >=0.60MPa, ultimate compression strength >=3.5MPa.
[embodiment 3]
1) proportioning raw materials: be that 3.0% toughener is 1.5% according to weight percent adjusting agent, water-holding agent is 0.6%, retardant is 0.5%, photocatalyst is 0.2%, binding agent 0.2%, desulfurated plaster 85%, calcium-magnesium powder 10%.
2) auxiliary agent preparation: adjusting agent, toughener, water-holding agent, retardant, photocatalyst, binding agent mixes according to weight proportion, then above mixing raw material is sent into stirrer, once stirs and mixes.
3) finished product is synthetic: according to weight percent, add desulfurization gypsum powder 85%, calcium-magnesium powder 10% to step 2) in the mixture that obtains, carry out secondary stirring mixing, by twice, fully mix, obtain filleting gypsum putty powder finished product, can directly use.
The filleting terra alba of preparing according to the present embodiment, except meeting People's Republic of China's building material industry standard (JC/T2075-2011).Specific targets are: presetting period 50-70min; Final setting time 60-90min; Water retention >=90%, tensile strength >=0.60MPa, ultimate compression strength >=3.0MPa.

Claims (6)

1. from desulfurized gesso of flue gas, preparing a method for filleting gypsum putty powder, is that to take the anhydrous or semi-hydrated gypsum of desulfurized gesso of flue gas after calcined dehydration be main raw material, adds auxiliary agent to prepare filleting gypsum putty powder as material of construction; It is characterized in that:
1) waste desulfurated plaster is crushed to 25-35 μ m and reaches more than 80%, then carry out high-temperature calcination, make CaSO 42H 2o loses crystal water and becomes CaSO 41/2H 2o or CaSO 4, obtain desulfurization gypsum powder;
2) according to weight percent by adjusting agent 0.5-3% toughener 0.5-1.5%, water-holding agent 0.1-0.6%, retardant 0.3-0.5%, photocatalyst 0.2-0.5%, binding agent 0.2-0.25%, be once uniformly mixed;
3) according to weight percent, add desulfurization gypsum powder 80-87%, calcium-magnesium powder 10-20% to step 2) in the mixture that obtains, carry out secondary stirring mixing, obtain filleting gypsum putty powder.
2. a kind of method of preparing filleting gypsum putty powder from desulfurized gesso of flue gas according to claim 1, is characterized in that: described adjusting agent is sulfonate fire retardant.
3. a kind of method of preparing filleting gypsum putty powder from desulfurized gesso of flue gas according to claim 1, is characterized in that: described toughener is borax.
4. a kind of method of preparing filleting gypsum putty powder from desulfurized gesso of flue gas according to claim 1, is characterized in that: described water-holding agent is Natvosol ethyl ether.
5. a kind of method of preparing filleting gypsum putty powder from desulfurized gesso of flue gas according to claim 1, is characterized in that: described retardant is polymeric amide.
6. a kind of method of preparing filleting gypsum putty powder from desulfurized gesso of flue gas according to claim 1, is characterized in that: described photocatalyst is nano photo-catalytic formaldehyde remover, is to adopt 50 nanometers following by TiO 2load ceramic crystal processes.
CN201310611406.9A 2013-11-26 2013-11-26 A kind of method preparing filleting gypsum putty powder from desulfurized gesso of flue gas Active CN103642295B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104846440A (en) * 2015-05-29 2015-08-19 昆明冶金研究院 Method for preparing high-purity calcium sulfate dihydrate crystal whisker by using metallurgic flue gas desulfurization gypsum recrystallization process
CN107434391A (en) * 2016-05-25 2017-12-05 北新集团建材股份有限公司 A kind of water-fast bonding gypsum powder and preparation method thereof
CN111606670A (en) * 2019-06-20 2020-09-01 中建材创新科技研究院有限公司 Caulking gypsum capable of purifying air and preparation method thereof
CN114276101A (en) * 2021-10-28 2022-04-05 安徽拓远环保科技有限公司 Preparation method of anhydrite-based light plastering gypsum with strong bonding force

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Publication number Priority date Publication date Assignee Title
US4002590A (en) * 1973-11-27 1977-01-11 Kikusui Kagaku Kogyo Kabushiki Kaisha Coating composition for thick coating
CN101747012A (en) * 2008-12-18 2010-06-23 北新集团建材股份有限公司 Caulking desulphurization gypsum
CN102344721A (en) * 2010-08-04 2012-02-08 北新集团建材股份有限公司 Paint composition and preparation method thereof

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Publication number Priority date Publication date Assignee Title
US4002590A (en) * 1973-11-27 1977-01-11 Kikusui Kagaku Kogyo Kabushiki Kaisha Coating composition for thick coating
CN101747012A (en) * 2008-12-18 2010-06-23 北新集团建材股份有限公司 Caulking desulphurization gypsum
CN102344721A (en) * 2010-08-04 2012-02-08 北新集团建材股份有限公司 Paint composition and preparation method thereof

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104846440A (en) * 2015-05-29 2015-08-19 昆明冶金研究院 Method for preparing high-purity calcium sulfate dihydrate crystal whisker by using metallurgic flue gas desulfurization gypsum recrystallization process
CN107434391A (en) * 2016-05-25 2017-12-05 北新集团建材股份有限公司 A kind of water-fast bonding gypsum powder and preparation method thereof
CN111606670A (en) * 2019-06-20 2020-09-01 中建材创新科技研究院有限公司 Caulking gypsum capable of purifying air and preparation method thereof
CN114276101A (en) * 2021-10-28 2022-04-05 安徽拓远环保科技有限公司 Preparation method of anhydrite-based light plastering gypsum with strong bonding force

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Effective date of registration: 20210817

Address after: 313009 No. 666, Chaoyang Road, Nanxun District, Huzhou City, Zhejiang Province

Patentee after: Zhejiang gudeyou Technology Co.,Ltd.

Address before: 201209 No. 2360 Golden Sea Road, Shanghai, Pudong New Area

Patentee before: SHANGHAI SECOND POLYTECHNIC University