CN102643070B - Ceramsite heat-preservation building block using non-calcined desulfurized gypsum as main cementing material and preparation method thereof - Google Patents

Ceramsite heat-preservation building block using non-calcined desulfurized gypsum as main cementing material and preparation method thereof Download PDF

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CN102643070B
CN102643070B CN 201210144372 CN201210144372A CN102643070B CN 102643070 B CN102643070 B CN 102643070B CN 201210144372 CN201210144372 CN 201210144372 CN 201210144372 A CN201210144372 A CN 201210144372A CN 102643070 B CN102643070 B CN 102643070B
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desulfurated plaster
take
insulation block
ceramsite
calcining
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CN102643070A (en
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孙振平
黄晖皓
刘警
吴小琴
杨辉
俞洋
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Tongji University
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Tongji University
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Abstract

The invention belongs to the technical field of building materials, particularly relates to a ceramsite heat-preservation building block using non-calcined desulfurized gypsum as a main cementing material and a preparation method thereof. The ceramsite heat-preservation building block is composed of the desulfurized gypsum, slag powder, superfine pulverized fuel ash, lime, cement, an early strength agent and light ceramsite. By means of the ceramsite heat-preservation building block using the non-calcined desulfurized gypsum as the main cementing material and the preparation method of the building block, the problem of recycling efficient utilization of the desulfurized gypsum can be solved, the recycling utilization goals including large absorbing amount, low energy consumption and high efficiency of the desulfurized gypsum are achieved, and the problems that the desulfurized gypsum is slow in hydration and the utilization range of traditional gypsum is limited can be solved effectively. The ceramsite heat-preservation building block using the non-calcined desulfurized gypsum as the main cementing material and the preparation method are suitable for wall body heat-preservation project construction of various buildings and can also meet certain strength and bearing requirements.

Description

A kind of ceramsite insulation block take non-calcining desulfurated plaster as main gelling material and preparation method thereof
Technical field
The invention belongs to building material technical field, be specifically related to a kind of ceramsite insulation block take non-calcining desulfurated plaster as main gelling material and preparation method thereof.
Background technology
Desulfurated plaster claims again desulfurized gesso of flue gas (Flue Gas Desulphurization Gypsum), is the flue gas that produces after sulfurous fuels (coal, the wet goods) burning is carried out that desulfurizing and purifying is processed and the industry by-product gypsum that obtains.China is the large consumption of coal of the first in the world state, and the sulphur content of China's coal is generally higher, and coal burning will produce a large amount of SO 2, atmosphere is caused severe contamination.And the desulfurated plaster that desulfurization produces has brought very large environmental pressure.Because the industrial gaseous waste components in desulfurization gypsum is complicated, contain simultaneously certain moisture, and the Gypsum Mine phase change is very responsive to temperature, this has brought very hang-up for the efficient application of desulfurated plaster.China's building materials industry is increasing to the demand of gypsum on the other hand, and the gypsum reserves of GOOD TASTE are little.How to optimize the desulfurated plaster Resources Utilization Structure, the balancing resource supply and demand are extremely urgent difficult problems.Produce various building materials of gypsum with desulfurized gypsum to substitute natural gypsum, not only can reduce the consumption of the plaster of paris, reduce the negative impact that mining brings to environment, can also form new industry and the new markets of desulfurated plaster goods.
Use in the market more autoclave aerated concrete building block, as main raw material take siliceous material (sand, flyash and contain silicon tailings etc.) and calcareous material (lime, cement), admixture foaming agent (aluminium powder), the light porous silicate product of making by technological processs such as batching, stirring, cast, precuring, cutting, steam pressure, maintenances.Its production technique comparatively complexity and energy consumption is larger, is difficult to promote on a large scale as energy-saving building materials, and in addition, because the impact of production technique and material, air-entrained concrete building block is used application problems such as easily causing wall crazing in engineering.
The invention provides a kind of ceramsite insulation block take non-calcining desulfurated plaster as main gelling material; with compound formation gelling systems such as trade waste desulfurated plaster, granulated blast-furnace slag and flyash; the light ceramic that forms take the riverway sludge sintering is made through vapor cure as light skeletal.The present invention not only realized the extensive recycling target of the trade wastes such as desulfurated plaster, obtained simultaneously all very excellent building heat preservation products of heat retaining property, weather resistance and safety performance, produced good economic and social benefit.
Summary of the invention
The object of the invention is to propose a kind of ceramsite insulation block take non-calcining desulfurated plaster as main gelling material and preparation method thereof.
A kind of ceramsite insulation block take non-calcining desulfurated plaster as main gelling material that the present invention proposes is comprised of desulfurated plaster, slag powders, flyash, lime, cement, hardening accelerator and light ceramic, and the weight ratio of each component is:
Desulfurated plaster 100
Slag powders 50-120
Cement 20-70
Flyash 2-10
Lime 1-5
Hardening accelerator 0.1-1
Light ceramic 20-120.
The better weight ratio of each component is:
Desulfurated plaster 100
Slag powders 70-110
Cement 30-60
Flyash 3-10
Lime 1-4
Hardening accelerator 0.1-0.8
Light ceramic 40-110.
Among the present invention, described desulfurated plaster is that the means of flue gas desulfurization of power plant gypsum is 60 oThe dry desulfurated plaster of the non-calcining of free water of removing under the C low temperature.
Among the present invention, described slag powders is a kind of in S95 slag powders or the S105 slag powders.
Among the present invention, described flyash is a kind of in II level high-calcium fly ass or the III level high-calcium fly ass.
Among the present invention, described cement is a kind of in 42.5 grades of ordinary Portland cements or the 52.5 grades of ordinary Portland cements.
Among the present invention, described hardening accelerator is a kind of in sodium-chlor or the calcium chloride.
Among the present invention, described light ceramic is for adopting the haydite of mud and firing sludge, and density rating is 400 kg/m 3Or 500 kg/m 3In a kind of.
A kind of preparation method take non-calcining desulfurated plaster as the ceramsite insulation block of main gelling material of the present invention, concrete steps are:
(1) take by weighing each component by aforementioned each part by weight, with desulfurated plaster, slag powders, cement, flyash, lime, hardening accelerator and light ceramic by mechanical dry mixing to uniform state.
(2) accurately take by weighing material and water in the step (1), first water is added stirrer, in the blade of stirrer rotation situation, again material in the step (1) is at the uniform velocity dropped into stirrer and continue to be stirred to uniform state.Amount of water is the 30%-160% of material weight of the present invention.
(3) gained slurry in the step (2) is carried out vapor cure after by the quiet 1-5h of stopping of concrete engineering specification requirement moulding, temperature rise rate is 10-40 ℃/h in the steam-cured process, steam curing temperature is 30-90 ℃, and the steam-cured time is 2-12h, and rate of temperature fall is 10-40 ℃/h.Namely get desired product after the steam-cured end.
Better amount of water is the 40-150% of material weight of the present invention in the step of the present invention (2).
Be 1-4h between the better quiet stopping time described in the step of the present invention (3), temperature rise rate is 10-30 ℃/h, and steam curing temperature is 40-90 ℃, and the steam-cured time is 4-12h, and rate of temperature fall is 10-30 ℃/h.
Among the present invention, desulfurated plaster is as main bonding component, and slag powders, flyash and a small amount of cement form the plural gel system as supplementary cementitious material with desulfurated plaster.Slag powders and flyash all are trade wastes, and its main component is very similar to cement clinker, are silicate and the silico-aluminates with potential gelation activity, the strength development that the hydrated calcium silicate gel that its aquation generates and drated calcium aluminate gel can Promotion systems.Adopt slag powders and flyash combined addition, " serviceability and the strength advantage complementary effect " of the two can improve workability, impermeability and the mechanical property of concrete or mortar.Cement self is not only gelling material simultaneously, but also playing excitation, the calcium hydroxide that it generates in hydration process can promote the growth of another kind of hydrated product ettringite, thereby accelerate the aquation process of desulfurated plaster, obviously increase the early strength of system.Mixing lime and hardening accelerator also is in order to excite the activity of desulfurated plaster, to improve the early strength of whole plural gel system, remedying the deficiency of a large amount of gypsum and in early days strength development aspect of mineral admixture.Adopt steam curing process so that goods obtain higher intensity at short notice, to improve and to produce turnover rate.Adopt the light ceramic of mud and firing sludge not only can reduce thermal conductivity, can also retrain as coarse aggregate the contraction of slurry, have better volume stability.
The present invention is a kind of ceramsite insulation block take non-calcining desulfurated plaster as main gelling material, under the prerequisite that satisfies certain mechanical property, heat-insulating property and endurance quality, adopting to greatest extent various trade wastes is starting material, has very high environmental benefit and social benefit.
The present invention can produce for building materials of gypsum factory or common buildings material factory, is widely used in the wall thermal insulating engineering construction.
Embodiment
Further specify the present invention below by embodiment.
Embodiment 1, and a kind of ceramsite insulation block take non-calcining desulfurated plaster as main gelling material is pressed desulfurated plaster 100,50,52.5 grades of ordinary Portland cements 20 of S105 slag powders, III level high-calcium fly ass 2, lime 1, sodium-chlor hardening accelerator 0.1 and 400 kg/m 3The level light ceramic 20 part by weight take by weighing each component, by mechanical dry mixing to uniform state.Accurately take by weighing aforementioned mixing material and water, first water is added stirrer, in the blade of stirrer rotation situation, again mixing material is at the uniform velocity dropped into stirrer and be stirred to uniform state.Amount of water is 30% of material weight of the present invention.The gained slurry is pressed concrete engineering specification requirement moulding, carries out vapor cure behind the quiet 1h of stopping, and temperature rise rate is 10 ℃/h in the steam-cured process, and steam curing temperature is 30 ℃, and the steam-cured time is 2h, and rate of temperature fall is 10 ℃/h.Namely get desired product after the steam-cured end.This insulation blocks dry density is 900kg/m 3, cubic compressive strength is 7.9MPa, thermal conductivity is 0.29W/ (m 2K), 90 days linear shrinking percentages are 0.019%.
Embodiment 2, and a kind of ceramsite insulation block take non-calcining desulfurated plaster as main gelling material is pressed desulfurated plaster 100,120,42.5 grades of ordinary Portland cements 70 of S95 slag powders, II level high-calcium fly ass 10, lime 5, calcium chloride hardening accelerator 1 and 500 kg/m 3Level light ceramic 120 part by weight take by weighing each component, by mechanical dry mixing to uniform state.Accurately take by weighing aforementioned mixing material and water, first water is added stirrer, in the blade of stirrer rotation situation, again mixing material is at the uniform velocity dropped into stirrer and be stirred to uniform state.Amount of water is 160% of material weight of the present invention.The gained slurry is pressed concrete engineering specification requirement moulding, carries out vapor cure behind the quiet 5h of stopping, and temperature rise rate is 40 ℃/h in the steam-cured process, and steam curing temperature is 90 ℃, and the steam-cured time is 12h, and rate of temperature fall is 40 ℃/h.Namely get desired product after the steam-cured end.This insulation blocks dry density is 800kg/m 3, cubic compressive strength is 7.0 MPa, thermal conductivity is 0.20 W/ (m 2K), 90 days linear shrinking percentages are 0.011%.
Embodiment 3, and a kind of ceramsite insulation block take non-calcining desulfurated plaster as main gelling material is pressed desulfurated plaster 100,60,52.5 grades of ordinary Portland cements 30 of S95 slag powders, II level high-calcium fly ass 3, lime 2, calcium chloride hardening accelerator 0.3 and 500 kg/m 3Level light ceramic 30 part by weight take by weighing each component, by mechanical dry mixing to uniform state.Accurately take by weighing aforementioned mixing material and water, first water is added stirrer, in the blade of stirrer rotation situation, again mixing material is at the uniform velocity dropped into stirrer and be stirred to uniform state.Amount of water is 50% of material weight of the present invention.The gained slurry is pressed concrete engineering specification requirement moulding, carries out vapor cure behind the quiet 2h of stopping, and temperature rise rate is 15 ℃/h in the steam-cured process, and steam curing temperature is 60 ℃, and the steam-cured time is 8h, and rate of temperature fall is 20 ℃/h.Namely get desired product after the steam-cured end.This insulation blocks dry density is 780kg/m 3, cubic compressive strength is 6.7MPa, thermal conductivity is 0.19 W/ (m 2K), 90 days linear shrinking percentages are 0.014%.
Embodiment 4, and a kind of ceramsite insulation block take non-calcining desulfurated plaster as main gelling material is pressed desulfurated plaster 100,70,42.5 grades of ordinary Portland cements 40 of S95 slag powders, II level high-calcium fly ass 10, lime 5, sodium-chlor hardening accelerator 0.4 and 500kg/m 3Level light ceramic 40 part by weight take by weighing each component, by mechanical dry mixing to uniform state.Accurately take by weighing aforementioned mixing material and water, first water is added stirrer, in the blade of stirrer rotation situation, again mixing material is at the uniform velocity dropped into stirrer and be stirred to uniform state.Amount of water is 60% of material weight of the present invention.The gained slurry is pressed concrete engineering specification requirement moulding, carries out vapor cure behind the quiet 3h of stopping, and temperature rise rate is 20 ℃/h in the steam-cured process, and steam curing temperature is 70 ℃, and the steam-cured time is 7h, and rate of temperature fall is 30 ℃/h.Namely get desired product after the steam-cured end.This insulation blocks dry density is 820kg/m 3, cubic compressive strength is 7.5MPa, thermal conductivity is 0.20 W/ (m 2K), 90 days linear shrinking percentages are 0.011%.
Embodiment 5, and a kind of ceramsite insulation block take non-calcining desulfurated plaster as main gelling material is pressed desulfurated plaster 100,80,52.5 grades of ordinary Portland cements 50 of S105 slag powders, III level high-calcium fly ass 6, lime 4, calcium chloride hardening accelerator 0.5 and 400 kg/m 3Level light ceramic 80 part by weight take by weighing each component, by mechanical dry mixing to uniform state.Accurately take by weighing aforementioned mixing material and water, first water is added stirrer, in the blade of stirrer rotation situation, again mixing material is at the uniform velocity dropped into stirrer and be stirred to uniform state.Amount of water is 100% of material weight of the present invention.The gained slurry is pressed concrete engineering specification requirement moulding, carries out vapor cure behind the quiet 5h of stopping, and temperature rise rate is 40 ℃/h in the steam-cured process, and steam curing temperature is 80 ℃, and the steam-cured time is 8h, and rate of temperature fall is 20 ℃/h.Namely get desired product after the steam-cured end.This insulation blocks dry density is 860kg/m 3, cubic compressive strength is 7.2MPa, thermal conductivity is 0.22W/ (m 2K), 90 days linear shrinking percentages are 0.013%.

Claims (10)

1. the ceramsite insulation block take non-calcining desulfurated plaster as main gelling material is comprised of desulfurated plaster, slag powders, flyash, lime, cement, hardening accelerator and light ceramic, and the weight ratio of each component is:
Desulfurated plaster 100
Slag powders 50-120
Cement 20-70
Flyash 2-10
Lime 1-5
Hardening accelerator 0.1-1
Light ceramic 20-120.
2. the ceramsite insulation block take non-calcining desulfurated plaster as main gelling material according to claim 1 is characterized in that the better weight ratio of each component is:
Desulfurated plaster 100
Slag powders 70-110
Cement 30-60
Flyash 3-10
Lime 1-4
Hardening accelerator 0.1-0.8
Light ceramic 40-110.
3. a kind of ceramsite insulation block take non-calcining desulfurated plaster as main gelling material according to claim 1 is characterized in that described sulphur gypsum is means of flue gas desulfurization of power plant gypsum dry desulfurated plaster of the non-calcining of free water of removing under 60 ℃ of low temperature.
4. a kind of ceramsite insulation block take non-calcining desulfurated plaster as main gelling material according to claim 1 is characterized in that described slag powders is a kind of in S95 slag powders or the S105 slag powders.
5. a kind of ceramsite insulation block take non-calcining desulfurated plaster as main gelling material according to claim 1 is characterized in that described flyash is a kind of in II level high-calcium fly ass or the III level high-calcium fly ass.
6. a kind of ceramsite insulation block take non-calcining desulfurated plaster as main gelling material according to claim 1 is characterized in that described cement is a kind of in 42.5 grades of ordinary Portland cements or the 52.5 grades of ordinary Portland cements.
7. a kind of ceramsite insulation block take non-calcining desulfurated plaster as main gelling material according to claim 1 is characterized in that described hardening accelerator is a kind of in sodium-chlor or the calcium chloride.
8. a kind of ceramsite insulation block take non-calcining desulfurated plaster as main gelling material according to claim 1 is characterized in that described light ceramic adopts mud and firing sludge to form, and density rating is 400 kg/m 3Or 500 kg/m 3In a kind of.
9. preparation method take non-calcining desulfurated plaster as the ceramsite insulation block of main gelling material as claimed in claim 1 is characterized in that concrete steps are:
(1) take by weighing by weight proportion each component, with desulfurated plaster, slag powders, cement, flyash, lime, hardening accelerator and light ceramic by mechanical dry mixing to uniform state;
(2) accurately take by weighing material and water in the step (1), first water is added stirrer, in the blade of stirrer rotation situation, again material in the step (1) is at the uniform velocity dropped into stirrer and continue to be stirred to uniform state;
Amount of water is the 30%-160% of raw material gross weight;
(3) gained slurry in the step (2) is pressed concrete engineering specification requirement moulding, carry out vapor cure behind the quiet 1-5h of stopping, temperature rise rate is 10-40 ℃/h in the steam-cured process, and steam curing temperature is 30-90 ℃, the steam-cured time is 2-12h, and rate of temperature fall is 10-40 ℃/h;
Namely get desired product after the steam-cured end.
10. the preparation method take non-calcining desulfurated plaster as the ceramsite insulation block of main gelling material described in according to claim 9 is characterized in that amount of water is the 40-150% of raw material gross weight in the step (2); Be 1-4h between the quiet stopping time described in the step (3), temperature rise rate is 10-30 ℃/h, and steam curing temperature is 40-90 ℃, and the steam-cured time is 4-12h, and rate of temperature fall is 10-30 ℃/h.
CN 201210144372 2012-05-11 2012-05-11 Ceramsite heat-preservation building block using non-calcined desulfurized gypsum as main cementing material and preparation method thereof Expired - Fee Related CN102643070B (en)

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CN105218057B (en) * 2015-11-03 2017-09-15 石河子大学 A kind of green lightweight aggregate concrete and its preparation technology
CN105669243B (en) * 2016-01-13 2018-03-02 武汉科技大学 A kind of desulfurated plaster and iron tailings haydite and preparation method thereof
CN107311587B (en) * 2017-06-28 2019-11-08 昆明理工大学 A method of ceramsite board is made with ardealite and cow dung
CN110423059A (en) * 2019-08-30 2019-11-08 郑州恒博环境科技股份有限公司 A kind of thermal insulation material containing desulfurization sludge and its preparation
CN110357542A (en) * 2019-08-31 2019-10-22 郑州恒博环境科技股份有限公司 A kind of fire-retardant wall body brick and preparation method thereof containing desulfurization wastewater sludge
CN110357543A (en) * 2019-08-31 2019-10-22 郑州恒博环境科技股份有限公司 A kind of light flame-retardant wall body brick and preparation method thereof containing desulfurization wastewater sludge
CN111620652A (en) * 2020-05-26 2020-09-04 甘肃华军建筑材料有限责任公司 Formula and method for preparing light building thermal insulation material by foaming desulfurized gypsum
CN112360029A (en) * 2020-11-11 2021-02-12 重庆交通大学 Environment-friendly cavity mold box with large-volume industrial solid waste and preparation method thereof

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CN101560806A (en) * 2009-05-01 2009-10-21 刘庭美 Light-weight energy-saving thermal insulating brick

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CN101560806A (en) * 2009-05-01 2009-10-21 刘庭美 Light-weight energy-saving thermal insulating brick

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