CN102992804B - Method for preparing aerated concrete by using phosphogypsum - Google Patents

Method for preparing aerated concrete by using phosphogypsum Download PDF

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CN102992804B
CN102992804B CN201210570364.4A CN201210570364A CN102992804B CN 102992804 B CN102992804 B CN 102992804B CN 201210570364 A CN201210570364 A CN 201210570364A CN 102992804 B CN102992804 B CN 102992804B
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phosphogypsum
slag
water
cement
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CN102992804A (en
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石庆忠
胡成军
孙荣
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TONGLING CHEMICAL INDUSTRY GROUP Co Ltd
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TONGLING CHEMICAL INDUSTRY GROUP Co Ltd
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Abstract

The invention discloses a method for preparing aerated concrete by using phosphogypsum, comprising the following steps of: mixing 45-50 parts of phosphogypsum and 0.6-0.9 part of dry-basis scrap steel slag powder, and aging for 3-5 days; then, adding 20 parts of water to the mixture to mix and carry out wet grinding to prepare phosphogypsum slurry, and standing for 3-5 days; and adding 22-27 parts of blast furnace water quenching slag powder, 1-2 parts of cement, 18-22 parts of limestone powder and 4-6 parts of quicklime, adding water while mixing the raw materials to be uniform, adding aluminum powder, an accelerator and a water reducer when the temperature is raised to 50-65 DEG C, and further stirring; and when the temperature is raised to 70-78 DEG C, pouring, standing, initially setting, cutting and carrying out steam-curing to finally obtain a phosphogypsum-contained aerated concrete building block. Indexes of the prepared aerated concrete meet the relevant requirements of GB11968-2006. Not only is a great deal of phosphogypsum consumed, but also materials are available, and the obtained concrete product is lower in cost.

Description

Method with phosphogypsum gas concrete processed
Technical field
The present invention relates to a kind of method of preparing gas concrete, specifically a kind of method with phosphogypsum gas concrete processed.
Background technology
Gas concrete is a kind of novel light wall material that country actively advocates use.At present commercially available conventional gas concrete kind is mainly powder ash air-entrained concrete and cement, the large class of sand aerated concrete two; The raw material that the former uses is mainly the waste residue-flyash of coal-burning power plant, because promoting the use of existing more than ten years of powder ash air-entrained concrete, in, developed regions quite a lot, east, the limited flyash in power station becomes very powerful and exceedingly arrogant building materials raw material already, and vigorous demand has caused the explant price of flyash to climb up and up.The latter's cost building block proportion higher and that make is larger, is unfavorable for the use of Highrise buildings.
Along with the high speed development of China's Phosphate Fertilizer Industry, the phosphogypsum of annual by-product, up to more than 5,000 ten thousand tons, wherein only has the phosphogypsum of 20% left and right to be utilized.Can be by phosphogypsum large-scale application in building materials field, all the time be the main direction of phosphogypsum comprehensive utilization, the products such as the ardealite setting retarder for cement of in recent years developing, phosphogypsum building gypsum plaster are sold radius and are restricted, output is difficult to promote, and causes the utilization ratio of phosphogypsum to be stabilized in a lower level always; If phosphogypsum can be made to new wall material, such as developing phosphogypsum gas concrete, can obviously improve undoubtedly the utilization ratio of phosphogypsum, greatly alleviate the pressure of storing up of phosphogypsum.Chinese patent literature CN102173712A " ardealite concrete aerated block " is disclosed a kind ofly so just take the gas concrete that phosphogypsum is raw material.This technology is had relatively high expectations to siliceous mineral material, must be dioxide-containing silica more than 80%, meet the mineral raw material of this condition such as flint, diatomite etc., be difficult for to obtain, make manufacturing cost increase.
Summary of the invention
The object of this invention is to provide a kind of method with phosphogypsum gas concrete processed, there is raw material and easily obtain, the advantage of low cost of manufacture.
The present invention includes following steps:
(1) get in weight ratio containing 45 ~ 50 parts of the phosphogypsums of free-water 11 ~ 13% mix with 0.6 ~ 0.9 part of butt steel scrap ground-slag, ageing is after 3 ~ 5 days, with 20 parts of water, mixes wet-milling with it, makes phosphogypsum slip, waits until after 3 ~ 5 days standby;
(2) in the slip making in step (1), add 22 ~ 27 parts of blast furnace water quenching ground-slags, 1 ~ 2 part of cement, 18 ~ 22 parts of commercially available-300 object limestone powders, 4 ~ 6 parts of unslaked limes, mixing is injected 230 parts of water simultaneously and is mixed, heats up;
(3) when described in step (2), material is warmed up to 50 ~ 65 ℃, add 0.07 ~ 0.09 part of aluminium powder, 0.5 ~ 1.5 part of setting accelerator sodium metaaluminate, 0.08 ~ 0.12 part of water reducer Xylo-Mucine, stir again while being warmed up to 70 ~ 78 ℃, cast, standing, initial set, cutting, steam-cured, finally obtain phosphogypsum air-entrained concrete building block.
In blast furnace water quenching slag, contain the mineral substance such as a large amount of Calucium Silicate powder, calcium aluminate, free calcium oxide, very easily react with gypsum and generate ettringite, have only to promote its hydration process, can also improve material later strength.
Above-mentioned gelling material with water mix after, silicate cement is aquation first, early stage hydrated product is mainly on interface, to form ettringite and C-S-H gel, plays skeleton function; Produced in addition Ca (OH) simultaneously 2, pH value in liquid phase is improved, slag starts to dissolve and aquation under alkaline condition, with the Ca (OH) in liquid phase 2, gypsum forms hydrated product C-S-H gel and ettringite jointly.Therefore, add proper amount of silicon acid salt cement can accelerate hydration reaction and carry out, improve the early strength of goods.
Steel scrap ground-slag described in step (1) is the waste residue that the slag that produces in steelmaking process finally discharges after selecting iron, and this slag need be dried and be milled down to-100 orders.The phosphogypsum treated due to end is slightly acidic conventionally, and pH value is generally 3 ~ 5, and waste steel slag is containing a large amount of CaO, so the water-soluble pH of waste steel slag is 10 ~ 12, can be effectively in phosphogypsum in acidic substance, phosphogypsum pH value can be adjusted to more than 7.And in waste steel slag, be rich in the mineral substance such as Fe2O3, SiO2, MgO, Al2O3, can become gelling material component wherein and be used.
Described in step (2), blast furnace water quenching ground-slag is the Water Quenching Slag of Steel Plant's by-product, and needs this slag to dry levigate to 500 ~ 550m 2/ kg.
Cement described in step (2) is that strength grade is not less than 42.5 ordinary Portland cement, and needs this cement superfine grinding to 550 ~ 600m 2/ kg.
The present invention carries out modification with waste steel slag to phosphogypsum, make gas concrete with materials such as blast furnace water quenching ground-slag, cement, limestone powder, unslaked limes again, its ultimate compression strength is at 2.5 ~ 4.0MPa, and mean coefficient of heat conductivity is 0.07 ~ 0.09W/Mk, and Absolute Dry Density is 380 ~ 530kg/m 3, porosity is 62% ~ 68%, other index all meets the related request of GB11968-2006.Not only can consume a large amount of phosphogypsums, and the material such as blast furnace water quenching ground-slag and waste steel slag easily obtains, gained concrete product cost is lower.
Embodiment
In following examples, phosphogypsum used is taken from Anhui Liuguo Chemical Industry Co., Ltd.'s ardealite storage yard, and it is containing free-water 11 ~ 13% by weight percentage, and its main component is as follows: CaO29.22%, SO 344.10%, P 2o 51.02%, F1.28%, SiO 22.51%,, Al 2o 30.81%, Fe 2o 31.05%.
Waste steel slag is taken from the waste residue that the slag that produces in Ma'anshan Iron and Steel Co., Ltd's steelmaking process finally discharges after selecting iron, drying, levigate to-100 orders.Its main component is as follows: CaO36.0%, SiO 234.56%,, Al 2o 310.08%, Fe 2o 31.01%, SO 32.05%.
Blast furnace water quenching ground-slag is taken from Tongling Fu Xin Iron And Steel Co., Ltd, and is milled to 500 ~ 550m 2/ kg, its main component is: CaO38.5%, SiO 216.63%,, Al 2o 37.00%, Fe 2o 318.90%, SO 36.05%.
Institute's water can be tap water, industrial colling or natural water.
Cement used is for being milled to 550 ~ 600m 2the ordinary Portland cement of/kg.
Limestone powder is commercially available-300 object limestone powders.
Embodiment 1:
(1) get 47 parts of phosphogypsums and mix with 0.8 part of steel scrap ground-slag, until ageing, after 3 days, inject 20 parts of clear water, through ceramic wet grinding machine, grind 30 minutes, made phosphogypsum slip, slip pumps in the storage tank with the slowly sealing of stirrer, and ageing was enabled after 4 days;
(2) 19 parts of 1.5 parts of cement, the limestone powders, 5 parts of the unslaked limes that in the slip making in step (1), add 26 parts of blast furnace water quenching ground-slags, 42.5 strength grades, 230 parts of processing industry water coolants mix, and heat up.
(3) mix and heat up at once add 0.1 part of 0.07 part of aluminium powder, 1 part of sodium metaaluminate, Xylo-Mucine when mixeding liquid temperature is raised to 55 ℃ after, when temperature is 75 ℃, pour at once mould, shift that initial set is indoorly standingly got angry, initial set cutting onto, just supporting indoor stop after 2.5 hours, the raw embryo of cutting, delivers to autoclave interior steam-cured approximately 12 hours, still internal pressure is 1.2MPa, and steam-cured end just can obtain phosphogypsum Aerated concrete products.
Embodiment 2:
(1) get 45 parts of phosphogypsums and mix with 0.6 part of waste steel slag, until ageing, after 4 days, inject 20 parts of industrial collings, through ceramic wet grinding machine, grind 30 minutes, made phosphogypsum slip, slip pumps in the storage tank with the slowly sealing of stirrer, and ageing was enabled after 4 days.
(2) 21 parts of 1 part of cement, the limestone powders, 4 parts of the unslaked limes that in the slip making in step (1), add 22 parts of blast furnace water quenching ground-slags, 42.5 strength grades, processing industry water coolant 230 powder mix, and heat up.
(3) mix and heat up at once add 0.08 part of 0.08 part of aluminium powder, 1.2 parts of sodium metaaluminates, Xylo-Mucine when mixeding liquid temperature is raised to 50 ℃ after, when temperature is 70 ℃, pour at once mould, shift that initial set is indoorly standingly got angry, initial set cutting onto, just supporting indoor stop after 2.5 hours, the raw embryo of cutting, delivers to autoclave interior steam-cured approximately 12 hours, still internal pressure is 1.2MPa, and steam-cured end just can obtain phosphogypsum Aerated concrete products.
Embodiment 3:
(1) get 50 parts of phosphogypsums and mix with 0.9 part of waste steel slag, until ageing, after 5 days, inject 20 parts of industrial collings, through ceramic wet grinding machine, grind 30 minutes, made phosphogypsum slip, slip pumps in the storage tank with the slowly sealing of stirrer, and ageing was enabled after 5 days.
(2) 18 parts of 2 parts of cement, the limestone powders, 4 parts of the unslaked limes that in the slip making in step (1), add 25 parts of blast furnace water quenching ground-slags, 52.5 strength grades, processing industry water coolant 230 powder mix, and heat up.
(3) mix and heat up at once add 0.12 part of 0.08 part of aluminium powder, 1.5 parts of sodium metaaluminates, Xylo-Mucine when mixeding liquid temperature is raised to 65 ℃ after, when temperature is 78 ℃, pour at once mould, shift that initial set is indoorly standingly got angry, initial set cutting onto, just supporting indoor stop after 2.5 hours, the raw embryo of cutting, delivers to autoclave interior steam-cured approximately 12 hours, still internal pressure is 1.2MPa, and steam-cured end just can obtain phosphogypsum Aerated concrete products.
Embodiment 4:
(1) get 46 parts of phosphogypsums and mix with 0.7 part of waste steel slag, until ageing, after 3 days, inject 20 parts of industrial collings, through ceramic wet grinding machine, grind 30 minutes, made phosphogypsum slip, slip pumps in the storage tank with the slowly sealing of stirrer, and ageing was enabled after 4 days.
(2) 22 parts of 2 parts of cement, the limestone powders, 6 parts of the unslaked limes that in the slip making in step (1), add 23 parts of blast furnace water quenching ground-slags, 52.5 strength grades, processing industry water coolant 230 powder mix, and heat up.
(3) mix and heat up at once add 0.11 part of 0.09 part of aluminium powder, 0.8 part of sodium metaaluminate, Xylo-Mucine when mixeding liquid temperature is raised to 65 ℃ after, when temperature is 75 ℃, pour at once mould, shift that initial set is indoorly standingly got angry, initial set cutting onto, just supporting indoor stop after 2.5 hours, the raw embryo of cutting, delivers to autoclave interior steam-cured approximately 12 hours, still internal pressure is 1.2MPa, and steam-cured end just can obtain phosphogypsum Aerated concrete products.
Embodiment 5:
(1) get 48 parts of phosphogypsums and mix with 0.6 part of waste steel slag, until ageing, after 3 days, inject 20 parts of industrial collings, through ceramic wet grinding machine, grind 30 minutes, made phosphogypsum slip, slip pumps in the storage tank with the slowly sealing of stirrer, and ageing was enabled after 3 days.
(2) 24 parts of 1.5 parts of cement, the limestone powders, 5 parts of the unslaked limes that in the slip making in step (1), add 22 parts of blast furnace water quenching ground-slags, 52.5 strength grades, processing industry water coolant 230 powder mix, and heat up.
(3) mix and heat up at once add 0.11 part of 0.07 part of aluminium powder, 0.5 part of sodium metaaluminate, Xylo-Mucine when mixeding liquid temperature is raised to 65 ℃ after, when temperature is 75 ℃, pour at once mould, shift that initial set is indoorly standingly got angry, initial set cutting onto, just supporting indoor stop after 2.5 hours, the raw embryo of cutting, delivers to autoclave interior steam-cured approximately 12 hours, still internal pressure is 1.2MPa, and steam-cured end just can obtain phosphogypsum Aerated concrete products.
Each embodiment products obtained therefrom performance is as following table:

Claims (4)

1. by the method for phosphogypsum gas concrete processed, it is characterized in that comprising the steps:
(1) get in weight ratio containing 45 ~ 50 parts of the phosphogypsums of free-water 11 ~ 13% mix with 0.6 ~ 0.9 part of butt steel scrap ground-slag, ageing is after 3 ~ 5 days, with 20 parts of water, mixes wet-milling with it, makes phosphogypsum slip, waits until after 3 ~ 5 days standby;
(2) in the slip making in step (1), add 22 ~ 27 parts of blast furnace water quenching ground-slags, 1 ~ 2 part of cement, 18 ~ 22 parts of commercially available-300 object limestone powders, 4 ~ 6 parts of unslaked limes, mixing is injected 230 parts of water simultaneously and is mixed, heats up;
(3) when described in step (2), material is warmed up to 50 ~ 65 ℃, add 0.07 ~ 0.09 part of aluminium powder, 0.5 ~ 1.5 part of setting accelerator sodium metaaluminate, 0.08 ~ 0.12 part of water reducer Xylo-Mucine, stir again while being warmed up to 70 ~ 78 ℃, cast, standing, initial set, cutting, steam-cured, finally obtain phosphogypsum air-entrained concrete building block.
2. the method with phosphogypsum gas concrete processed according to claim 1, is characterized in that: described in step (2), blast furnace water quenching ground-slag is the Water Quenching Slag of Steel Plant's by-product, and needs this slag to dry levigate to 500 ~ 550m 2/ kg.
3. the method with phosphogypsum gas concrete processed according to claim 1, is characterized in that: cement described in step (2) is that strength grade is not less than 42.5 ordinary Portland cement, and needs this cement superfine grinding to 550 ~ 600m 2/ kg.
4. the method with phosphogypsum gas concrete processed according to claim 1, it is characterized in that: steel scrap ground-slag described in step (1) is the waste residue that the slag that produces in steelmaking process finally discharges after selecting iron, and this slag need be dried and be milled down to-100 orders.
CN201210570364.4A 2012-12-25 2012-12-25 Method for preparing aerated concrete by using phosphogypsum Active CN102992804B (en)

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CN103408323B (en) * 2013-08-06 2014-10-01 昆明理工大学 Method for producing air-entrapping building blocks by using potassium sulfate leaching residues
CN105218052A (en) * 2015-08-24 2016-01-06 广西亿品投资有限公司 A kind of Ardealite concrete
CN107459311B (en) * 2017-07-25 2020-04-03 湖北工业大学 Preparation method of waste-utilizing, fracture-resisting and toughening wet-grinding slurry-like admixture
CN109608149A (en) * 2019-01-14 2019-04-12 四川绵筑新材料有限公司 A kind of phosphorus building gypsum foamed heat insulating building block and preparation method thereof
CN111320447A (en) * 2020-03-05 2020-06-23 湖南三一快而居住宅工业有限公司 Autoclaved aerated concrete, autoclaved aerated concrete slab and preparation method thereof
CN111825408A (en) * 2020-06-23 2020-10-27 中冶南方都市环保工程技术股份有限公司 Sludge curing agent prepared from steel slag modified phosphogypsum and use method thereof

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CN101648403A (en) * 2009-09-04 2010-02-17 昆明理工大学 Method for producing air entrapping building block by utilizing ardealite
CN102173712B (en) * 2011-03-07 2012-12-12 雷冬华 Ardealite concrete aerated block
CN102491717B (en) * 2011-11-21 2013-06-12 武汉理工大学 Gypsum-base concrete with performances of sugaring resistance and carbonization resistance, and preparation method thereof
CN102515681B (en) * 2011-12-12 2014-07-02 昆明理工大学 Method for producing aerated building block with phosphogypsum as main raw material

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