CN111892369A - Preparation method of low-cost heat-insulation plastering gypsum - Google Patents
Preparation method of low-cost heat-insulation plastering gypsum Download PDFInfo
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- CN111892369A CN111892369A CN202010772878.2A CN202010772878A CN111892369A CN 111892369 A CN111892369 A CN 111892369A CN 202010772878 A CN202010772878 A CN 202010772878A CN 111892369 A CN111892369 A CN 111892369A
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- gypsum
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions 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
- C04B28/142—Compositions 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
- C04B28/144—Compositions 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B11/00—Calcium sulfate cements
- C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
- C04B11/262—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke waste gypsum other than phosphogypsum
- C04B11/264—Gypsum from the desulfurisation of flue gases
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a preparation method of low-cost heat-insulating plastering gypsum, which is characterized in that desulfurized gypsum is adopted for calcination, beta-type semi-hydrated gypsum is obtained, the beta-semi-hydrated gypsum and causticized white sludge are uniformly stirred, and then are uniformly stirred with hydroxypropyl methyl cellulose, lignocellulose, a heat-insulating modifier, bonite and calcium sulphoaluminate cement. The low-cost heat-insulating plastering gypsum can disperse the rubber powder and the retarder without adding expensive imports, and is replaced by the causticized white sludge and the calcium sulphoaluminate cement, so that the strength of the plastering gypsum can be achieved, the cost is low, and the phenomenon of shrinkage cracking cannot be caused. According to the invention, a small amount of Bonet is added, so that the strength of the plastering gypsum can be effectively improved, and a small amount of heat insulation modifier is added, so that the heat insulation performance of the plastering gypsum can be effectively improved on the premise of effectively controlling the cost.
Description
Technical Field
The invention relates to the technical field of plastering gypsum, in particular to a preparation method of low-cost heat-insulation plastering gypsum.
Background
The currently marketed bottom layer plastering gypsum is usually manufactured by mixing outsourced mixed sand and surface layer plastering gypsum in proportion, the product performance produced by the method has higher dependence degree on the stability of the sand, and if the supply quality of the sand is unstable, the product performance is greatly influenced. The thickness and mixing ratio of the sand, i.e., the sand grains of different grain sizes, greatly affect the performance of the plastering gypsum because of: in concrete, the surface of the sand needs to be covered by gypsum slurry, and the greater the total surface area of the sand, the more gypsum slurry needs to be covered on the surface of the sand. Under the condition of the same dosage, the total surface area of the fine sand is larger, and the total surface area of the coarse sand is smaller, while the traditional process usually adopts powdery quartz sand, and the powdery quartz sand brings the reduction of the cracking resistance after exceeding a certain thickness.
The invention has strict requirements on the quality of the sand, and carries out deep research and analysis on the gradation of the sand, so that the prepared product has strong bonding force, effectively inhibits the shrinkage cracking phenomenon in plastering, and better solves the common problems of hollowing cracking, falling off and the like of cement mortar and mixed mortar plastering. In order to reduce the cost and effectively prevent the shrinkage cracking, a preparation method of low-cost heat-insulating plastering gypsum needs to be researched.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a preparation method of low-cost heat-insulation plastering gypsum.
The technical scheme of the invention is as follows:
a preparation method of low-cost heat-insulating plastering gypsum comprises the following steps:
A. after being pre-dried at the temperature of 80-90 ℃, the desulfurized gypsum enters a boiling calciner, is calcined at the temperature of 120-130 ℃, is added into an impact type flour mill for grinding, and is aged after being cooled;
B. uniformly stirring the aged desulfurized gypsum and the causticized white sludge, repeatedly grinding, and sieving by a 325-mesh sieve;
C. then adding hydroxypropyl methyl cellulose, lignocellulose, a thermal insulation modifier, bonite and calcium sulphoaluminate cement, uniformly stirring, grinding and sieving with a 200-mesh sieve.
Preferably, the aging time in the step A is 7 to 10 days.
Preferably, in the step B, the causticized white slime is paper-making alkali recovery causticized white slime with the water content of 8-15%.
Preferably, the heat insulation modifier is a mixture of cross-linked polysaccharide acetate and sodium citrate.
Preferably, in the step C, the calcium sulfoaluminate cement is an auto-stress sulfoaluminate cement.
Preferably, the low-cost heat-insulating plastering gypsum consists of the following components in percentage by weight: 8-15% of causticized white sludge, 1-3% of hydroxypropyl methyl cellulose, 2-5% of lignocellulose, 3-6% of calcium sulphoaluminate cement, 0.5-1% of heat insulation modifier, 0.2-0.5% of bonite and the balance of desulfurized gypsum.
Bonite is a new synthetic dense refractory aggregate based on a mineral phase of calcium hexaluminate (CA 6). CA6 has the following main properties: high refractoriness; high stability in reducing atmosphere (such as carbon monoxide); the chemical stability in alkaline environment is good; has low wettability to molten metal and slag.
The main problem to be solved by the invention is how to effectively improve the heat insulation performance of the plastering gypsum under the condition of adding a small amount of bonate due to high cost of bonate. In the invention, in order to improve the heat insulation performance, a small amount of self-stress sulphoaluminate cement and a heat insulation modifier are added.
The invention has the advantages that: the preparation method of the low-cost heat-insulating plastering gypsum adopts the desulfurized gypsum to calcine to obtain the beta-semi-hydrated gypsum, uniformly mixes the beta-semi-hydrated gypsum with causticized white sludge, then mixes the beta-semi-hydrated gypsum with hydroxypropyl methyl cellulose, lignocellulose, heat-insulating modifier, bonite and calcium sulphoaluminate cement, and uniformly mixes the beta-semi-hydrated gypsum with the calcium sulphoaluminate cement. The low-cost heat-insulating plastering gypsum can disperse the rubber powder and the retarder without adding expensive imports, and is replaced by the causticized white sludge and the calcium sulphoaluminate cement, so that the strength of the plastering gypsum can be achieved, the cost is low, and the phenomenon of shrinkage cracking cannot be caused. According to the invention, a small amount of Bonet is added, so that the strength of the plastering gypsum can be effectively improved, and a small amount of heat insulation modifier is added, so that the heat insulation performance of the plastering gypsum can be effectively improved on the premise of effectively controlling the cost.
Detailed Description
Example 1
A preparation method of low-cost heat-insulating plastering gypsum comprises the following steps:
A. after being pre-dried at the temperature of 88 ℃, the desulfurized gypsum enters a boiling calciner, is calcined at the temperature of 125 ℃, is added into an impact type pulverizer for grinding, and is aged after being cooled;
B. uniformly stirring the aged desulfurized gypsum and the causticized white sludge, repeatedly grinding, and sieving by a 325-mesh sieve;
C. then adding hydroxypropyl methyl cellulose, lignocellulose, a thermal insulation modifier, bonite and calcium sulphoaluminate cement, uniformly stirring, grinding and sieving with a 200-mesh sieve.
The aging time in the step A is 8 days.
In the step B, the causticized white slime is papermaking alkali recovery causticized white slime with the water content of 11 percent.
In the step C, the heat insulation modifier is a mixture of cross-linked polysaccharide acetate and sodium citrate; the mass ratio of the cross-linked polysaccharide acetate to the sodium citrate is 4: 1.
In the step C, the calcium sulphoaluminate cement is self-stress sulphoaluminate cement.
The low-cost heat-insulation plastering gypsum consists of the following components in percentage by weight: 11% of causticized white sludge, 2.5% of hydroxypropyl methylcellulose, 4.5% of lignocellulose, 5.5% of calcium sulfoaluminate cement, 0.8% of heat insulation modifier, 0.25% of bonite and the balance of desulfurized gypsum.
Example 2
A preparation method of low-cost heat-insulating plastering gypsum comprises the following steps:
A. after being pre-dried at the temperature of 80 ℃, the desulfurized gypsum enters a boiling calciner, is calcined at the temperature of 120 ℃, is added into an impact type pulverizer for grinding, and is aged after being cooled;
B. uniformly stirring the aged desulfurized gypsum and the causticized white sludge, repeatedly grinding, and sieving by a 325-mesh sieve;
C. then adding hydroxypropyl methyl cellulose, lignocellulose, a thermal insulation modifier, bonite and calcium sulphoaluminate cement, uniformly stirring, grinding and sieving with a 200-mesh sieve.
The aging time in the step A is 7 days.
In the step B, the causticized white slime is papermaking alkali recovery causticized white slime with the water content of 15 percent.
In the step C, the heat insulation modifier is a mixture of cross-linked polysaccharide acetate and sodium citrate; the mass ratio of the cross-linked polysaccharide acetate to the sodium citrate is 3: 1.
In the step C, the calcium sulphoaluminate cement is self-stress sulphoaluminate cement.
The low-cost heat-insulation plastering gypsum consists of the following components in percentage by weight: 15% of causticized white sludge, 3% of hydroxypropyl methyl cellulose, 2.5% of lignocellulose, 3% of calcium sulfoaluminate cement, 1% of heat insulation modifier, 0.5% of Bonet and the balance of desulfurized gypsum.
Example 3
A preparation method of low-cost heat-insulating plastering gypsum comprises the following steps:
A. after being pre-dried at the temperature of 90 ℃, the desulfurized gypsum enters a boiling calciner, is calcined at the temperature of 130 ℃, is added into an impact type pulverizer for grinding, and is aged after being cooled;
B. uniformly stirring the aged desulfurized gypsum and the causticized white sludge, repeatedly grinding, and sieving by a 325-mesh sieve;
C. then adding hydroxypropyl methyl cellulose, lignocellulose, a thermal insulation modifier, bonite and calcium sulphoaluminate cement, uniformly stirring, grinding and sieving with a 200-mesh sieve.
The aging time in the step A is 10 days.
In the step B, the causticized white slime is papermaking alkali recovery causticized white slime with the water content of 8 percent.
In the step C, the heat insulation modifier is a mixture of cross-linked polysaccharide acetate and sodium citrate; the mass ratio of the cross-linked polysaccharide acetate to the sodium citrate is 5: 1.
In the step C, the calcium sulphoaluminate cement is self-stress sulphoaluminate cement.
The low-cost heat-insulation plastering gypsum consists of the following components in percentage by weight: 8% of causticized white sludge, 1% of hydroxypropyl methylcellulose, 5% of lignocellulose, 6% of calcium sulfoaluminate cement, 0.5% of thermal insulation modifier, 0.2% of Bonet and the balance of desulfurized gypsum.
Example 4
A preparation method of low-cost heat-insulating plastering gypsum comprises the following steps:
A. after being pre-dried at the temperature of 90 ℃, the desulfurized gypsum enters a boiling calciner, is calcined at the temperature of 125 ℃, is added into an impact type pulverizer for grinding, and is aged after being cooled;
B. uniformly stirring the aged desulfurized gypsum and the causticized white sludge, repeatedly grinding, and sieving by a 325-mesh sieve;
C. then adding hydroxypropyl methyl cellulose, lignocellulose, a thermal insulation modifier, bonite and calcium sulphoaluminate cement, uniformly stirring, grinding and sieving with a 200-mesh sieve.
The aging time in the step A is 8 days.
In the step B, the causticized white slime is papermaking alkali recovery causticized white slime with the water content of 10.5 percent.
In the step C, the heat insulation modifier is a mixture of cross-linked polysaccharide acetate and sodium citrate; the mass ratio of the cross-linked polysaccharide acetate to the sodium citrate is 3: 1.
In the step C, the calcium sulphoaluminate cement is self-stress sulphoaluminate cement.
The low-cost heat-insulation plastering gypsum consists of the following components in percentage by weight: 10% of causticized white sludge, 2.5% of hydroxypropyl methylcellulose, 5% of lignocellulose, 4.5% of calcium sulfoaluminate cement, 0.5% of heat insulation modifier, 0.25% of bonite and the balance of desulfurized gypsum.
Example 5
A preparation method of low-cost heat-insulating plastering gypsum comprises the following steps:
A. after being pre-dried at the temperature of 90 ℃, the desulfurized gypsum enters a boiling calciner, is calcined at the temperature of 122 ℃, is added into an impact type pulverizer for grinding, and is aged after being cooled;
B. uniformly stirring the aged desulfurized gypsum and the causticized white sludge, repeatedly grinding, and sieving by a 325-mesh sieve;
C. then adding hydroxypropyl methyl cellulose, lignocellulose, a thermal insulation modifier, bonite and calcium sulphoaluminate cement, uniformly stirring, grinding and sieving with a 200-mesh sieve.
The aging time in the step A is 8 days.
In the step B, the causticized white slime is papermaking alkali recovery causticized white slime with the water content of 10 percent.
In the step C, the heat insulation modifier is a mixture of cross-linked polysaccharide acetate and sodium citrate; the mass ratio of the cross-linked polysaccharide acetate to the sodium citrate is 4: 1.
In the step C, the calcium sulphoaluminate cement is self-stress sulphoaluminate cement.
The low-cost heat-insulation plastering gypsum consists of the following components in percentage by weight: 12.5 percent of causticized white sludge, 2.5 percent of hydroxypropyl methylcellulose, 3 percent of lignocellulose, 3.5 percent of calcium sulphoaluminate cement, 0.75 percent of heat insulation modifier, 0.35 percent of bonite and the balance of desulfurized gypsum.
Comparative example 1
The bonate in example 1 was removed and the rest of the formulation and preparation method were unchanged.
Comparative example 2
The thermal insulation modifier in the embodiment 1 is removed, the amount of the bonite is increased to 5 percent (the content of the desulfurized gypsum is reduced), and the rest proportion and the preparation method are unchanged.
Comparative example 3
The thermal insulation modifier in example 1 was removed, and the rest of the formulation and the preparation method were unchanged.
The plastering gypsum prepared in examples 1 to 3 and comparative examples 1 to 3 were examined as follows according to JC/T517-one 2004 plastering gypsum, the results of which are shown in Table 1.
From the above test data, it can be seen that the low-cost heat-insulating plastering gypsum of the present invention can satisfy the standard requirements of plastering gypsum and has excellent heat-insulating properties.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. A preparation method of low-cost heat-insulating plastering gypsum is characterized by comprising the following steps:
A. after being pre-dried at the temperature of 80-90 ℃, the desulfurized gypsum enters a boiling calciner, is calcined at the temperature of 120-130 ℃, is added into an impact type flour mill for grinding, and is aged after being cooled;
B. uniformly stirring the aged desulfurized gypsum and the causticized white sludge, repeatedly grinding, and sieving by a 325-mesh sieve;
C. then adding hydroxypropyl methyl cellulose, lignocellulose, a thermal insulation modifier, bonite and calcium sulphoaluminate cement, uniformly stirring, grinding and sieving with a 200-mesh sieve.
2. The method of making a low cost thermal insulating stucco gypsum of claim 1, wherein the aging time in step a is 7-10 days.
3. The method for preparing low-cost heat-insulating plastering gypsum according to claim 1, wherein in the step B, the causticized white slime is paper-making alkali recovery causticized white slime with the water content of 8-15%.
4. The method of making a low cost insulating stucco gypsum of claim 1, wherein the insulation modifier is a mixture of cross-linked polysaccharide acetate and sodium citrate.
5. The method of preparing a low cost thermal insulating stucco gypsum of claim 1, wherein in step C, the calcium sulfoaluminate cement is a self-stressed sulfoaluminate cement.
6. The method of preparing low cost heat insulating stucco gypsum of claim 1, wherein the low cost heat insulating stucco gypsum comprises the following components by weight percent: 8-15% of causticized white sludge, 1-3% of hydroxypropyl methyl cellulose, 2-5% of lignocellulose, 3-6% of calcium sulphoaluminate cement, 0.5-1% of heat insulation modifier, 0.2-0.5% of bonite and the balance of desulfurized gypsum.
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Application publication date: 20201106 |