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IPC classes for russian patent Method for manufacture of products from anhydrite (RU 2356866):
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Method for manufacture of products from anhydrite / 2356866
Invention is related to method for manufacture of products from anhydrite. In method for products manufacture from anhydrite including preparation of anhydrite mixture with additive that activates its hydration in process of combined crushing, moistening of produced mixture, further moulding and hardening of products, crushing is carried out together with 1-3% of plasticiser down to particle size of less than 80 mcm, and after moistening mixture is additionally exposed to hydromechanical activation for 3-5 minutes. Additive that activates anhydrite hydration may be Portland cement in amount of at least 20%. Moulded products may be dried at 50-70°C for 1-3 hours. On completion of drying products may be repeatedly moistened and dried.
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FIELD: construction.
SUBSTANCE: invention is related to method for manufacture of products from anhydrite. In method for products manufacture from anhydrite including preparation of anhydrite mixture with additive that activates its hydration in process of combined crushing, moistening of produced mixture, further moulding and hardening of products, crushing is carried out together with 1-3% of plasticiser down to particle size of less than 80 mcm, and after moistening mixture is additionally exposed to hydromechanical activation for 3-5 minutes. Additive that activates anhydrite hydration may be Portland cement in amount of at least 20%. Moulded products may be dried at 50-70°C for 1-3 hours. On completion of drying products may be repeatedly moistened and dried.
EFFECT: reduction of time required for setting and hardening of anhydrite binder, and also increased strength of products on the basis of this binder.
4 cl, 1 tbl
The invention relates to technology use anhydrite, anhydrous calcium sulphate, as a mineral binder.
A method of obtaining anhydrite binder titled "Oestrich-plaster" and the subsequent production of a product in which at the beginning of roasting at high, 800-1000°C, the temperature and subsequent grinding receive a binder, which is then mixed with water, and the resulting dough is formed into products (Gypsum materials and products (production and use). Reference under the General editorship Averroistas, M.: Publishing house of the DIA, 2004, s). The disadvantages of this method should be considered as a slow setting and hardening products.
A method of obtaining building materials from anhydrite, comprising preparing a mixture of anhydrite with the addition of activating its hydration, joint grinding, moistening the mixture, followed by molding and hardening products (EN 2002717 S1). The disadvantage of this method is slow setting and hardening products. To the greatest extent slow setting and hardening of anhydrite occur when using injection molding technology.
The technical problem to be solved in the present method, is to accelerate the timing of setting and hardening of anhydrite binder, as well as increasing its strength products Pimentel is to injection molding technology products.
This task is solved in that in the method of producing products from anhydrite, including grinding anhydrite, mixing it with the addition of activating hydration, hydration mixture, followed by molding and hardening the obtained product, in a mixture of anhydrite and additives injected 1-3% of plasticizer and grind it up to a particle size less than 80 microns, moisture and subjected to hydro-mechanical activation in 3-5 minutes, and then molded products. To increase the strength of the products along with hydro-mechanical activation using dried at 50-70°C for 1-3 hours, after which the product is re-humidified and dried. As an additive, activates the hydration of anhydrite, along with traditional materials can be used Portland cement in an amount not less than 20%.
Experimental validation of the proposed method was performed using anhydrite binder, obtained by firing at 800°C for 2 hours gypsum stone, having the following chemical composition, wt.%: PPP...19,3; SiO2...3,2; Al2About3...0,9; Fe2O3...0,2; Cao...32,2; MgO...2,4; SO3...41,8. The product of firing, anhydrite (AG), an activating additive to Portland cement (PC), crushed together with the plasticizer to the complete passage of the mixture through a sieve of 80 μm. As the plasticizer used: superplasticizer C3, l is resultant (lsls) and lignospan 2B(LPB). Astringent kneaded with water in an amount necessary to obtain consistency with fluidity on the viscometer Attard 180-190 mm (GOST 125-79) and the resulting mixture was subjected to hydro-mechanical activation (GMA). The activation mixture was carried out in a cylindrical tank with a diameter of 12 and a height of 20 cm, the center of which is mounted a vertical shaft with a pair of blades, the cross-sectional plane of rotation. The shaft is revolved by an electric drive with a frequency of about 980./minutes
Of the mixture was molded samples tablets with a diameter and height of 30 mm, the hardening of which occurred above the water surface in the air-humid conditions. Part of the tablets directly into the forms were subjected to drying in a drying Cabinet at a temperature of 65°C.
In experiments 2-10 composition was injected Portland cement (PC) brand MD" in the amount of 50%. In experiments 8-10 samples were subjected to drying. In experiment 9 after 2 hours of drying, the samples were placed in water for 20 min and was carried out by repeated drying and experience 10 hydration repeated, and then again dried.
The table shows the results of the tests
| No. |
The composition of the binder, % |
Astringent properties |
| In/In - relation |
GMA, minutes |
Time shvatim., hour-min, beginning/end. |
RSG, MPa, 1 day |
| 1 |
AG(93)+lime(7) |
0,4 |
- |
2-35/21-15 |
0,38 |
|
AG(78)+19(PC)+C3(3) |
0,35 |
- |
1-20/4-15 |
3,1 |
| 3 |
AG(78)+19(PC)+C3(3) |
0,33 |
3 |
0-55/3-25 |
4,8 |
| 4 |
AG(50)+(PC)+C3(1) |
0,25 |
3 |
0-35/3-05 |
7,8 |
| 5 |
AG(50)+47(PC)+C3(3) |
0,22 |
5 |
0-30/2-10 |
8,5 |
| 6 |
AG(50)+47(PC)+LST(3) |
0,25 |
5 |
0-40/2-30 |
6,1 |
| 7 |
AG(50)+47(PC)LPB(3) |
0,24 |
5 |
0-35/2-00 |
6,5 |
| 8 |
AG(50)+47(PC)+C3(3) |
0,22 |
5 |
0-15/0-30* |
14,7 |
| 9 |
AG(50)+47(PC)+C3(3) |
0,22 |
5 |
0-15/0-30** |
16,1 |
| 10 |
AG(50)+47(PC)+C3(3) |
0,22 |
5 |
0-15/0-30*** |
of 17.0 |
* after drying at 65°C;
* * * * * after 1 - and 2-fold hydrate and 2 - and 3-Kratovo drying, respectively. |
In the note indicated the claims corresponding to each of the experiments.
This table shows that, in comparison with the prototype, the inventive method provides a significant acceleration of hardening of anhydrite, especially when used in combination with cement and with the use of hydro-mechanical activation. Drying time should be determined by the volume of products and not have to be full to is to provide for the continuation of the processes of hydration, stimulating hardening as anhydrite and cement. The use of cement as activating additives, compared with traditional additives composition, according to the samples of extra durability, so you can enter it at less than 20% is impractical (experiments 2-3).
Activation accelerates the hydration of anhydrite and cement by mechanical removal from the surface of the grain binder shells of the products of hydration, preventing access of water inside. The duration of activation 3-5 minutes with the best combination of technical and economic indicators.
Of the plasticizers used in the experiments, the highest efficiency was shown by the superplasticizer C3. The optimal dosage of plasticizer should be chosen empirically based on a balance between cost-effectiveness of application".
The effect of repeated drying is significantly lower than from the primary drying, therefore, to increase the number of cycles of drying-wetting over two inappropriate.
Along with the acceleration of hardening of the inventive method provides a significant acceleration of the hardening period anhydrite binder and increases the strength of the products based on it.
The effect of accelerating the setting and hardening anhydrite binder according to the present method, probably, is ensured by a high degree of fineness, complemented by Gerome onicescu activation. The mentioned combination accelerates the dissolution of anhydrite, its hydration and subsequent hardening binder. The presence in the composition of the cement provides increased strength at a later date. The temperature rise of the plaster test associated with drying, probably stimulates internal mass transfer in the gypsum stone and thus accelerates the hydration of anhydrite, which simultaneously reduces the time setting binder. Partial drying of the samples leads to crystallization in the pores of the gypsum dihydrate dissolved calcium sulphate. In this case, there is a decrease in porosity of the samples and, consequently, increase their strength.
Using the proposed method will allow to extend the scope of cheap compared to a cement binder anhydrite binder. The greatest effect of the inventive method should provide when using anhydrite from natural deposits.
Estimated cheaper products from anhydrite binder, which should ensure the use of the proposed method, can be from 10 to 50%.
1. The method of obtaining products of anhydrite, comprising preparing a mixture of anhydrite from activating its hydration Supplement with joint grinding, moistening the mixture, followed by molding and hardening products, characterized in that milczenie exercise jointly with 1-3% of plasticizer to particle size less than 80 microns, and after moistening the mixture is optionally subjected to a hydro-mechanical activation within 3-5 minutes
2. The method according to claim 1, characterized in that an additive that activates the hydration of anhydrite, use Portland cement in an amount not less than 20%.
3. The method according to claim 1, characterized in that the molded product is dried at 50-70°C for 1-3 h
4. The method according to claim 3, characterized in that after drying the product is re-humidified and dried.
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