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INVENTION
Russian Federation Patent RU2235076
METHOD FOR PRODUCING silicate bricks
Name of the inventor: Demidov VK (RU); He AF (RU)
The name of the patentee: Closed Joint Stock Company "plinth" (RU)
Address for correspondence: 414042, Astrakhan, ul. Mosin, 1, JSC "plinth"
Starting date of the patent: 2004.02.10
The invention relates to the manufacture of building materials and is intended for use in the manufacture of silica bricks. The technical result is to increase the strength of a silicate brick, its hardiness and simplifying its manufacturing process. In the manufacturing method of silica brick, comprising preparing a binder by treating the carbide lime or mixed with sand, the preparation of the raw material mixture by mixing the resulting binder with sand quarry moisture while heating, followed by molding raw and hydrothermal treatment in an autoclave using carbide lime containing active CaO and MgO 60-70%, with a sand quarry humidity fineness modulus 0.7-1.1, treating said carbide lime is carried out until the specific surface 9000-10000 cm 2 / g, and its mixture with sand to a specific surface - 4500-6000 cm 2 / g, while heating up the next 70-80ºS their ratio, wt.%: 11-22 said binder, said sand 78-89. and molding the raw mixture is carried out at 6.0-8.5% moisture, temperature 50-60ºS and the pressing pressure of 20-25 MPa.
DESCRIPTION OF THE INVENTION
The invention relates to the manufacture of building materials and is intended for use in the manufacture of silica bricks.
A method for manufacturing silicate bricks, comprising the preparation of lime-silica binder co-grinding pre-dried to a moisture content of 1.5-2.0% of the carbide lime and dried to a moisture content of 0.5-0.8% sand with a fineness modulus 0,70-1, 12 and the specific surface area of 4000-5000 cm 2 / g in the ratio of said lime and sand 1.2-2.0: 1.0, the preparation of said feed mixture is mixed with binder-dried to a moisture content of 1.5-2.0% sand of the same fineness modulus binder in a ratio of 15-20% and 80-85% of sand, forming a mixture of a raw moisture content of 5.5-6.5% and a temperature in the pressing pressure 50-60ºS 20,0-25,0 MPa [1].
The main significant disadvantages of this method are:
- The high cost of steam in the drying of sand and lime and sand drying;
- The high cost of electricity for preparation of lime-silica binder.
And known method of manufacturing silica brick, which is closest to the claimed technical solution - analogue, taken as a prototype, comprising the preparation of the binder with the carbide lime content of active CaO and MgO is not less than 50%, its specific surface treatment to 2400-8000 cm2 / g including in admixture with sand up to a specific surface 4500-5000 cm 2 / g and a preparation obtained by mixing the raw mix the binder with sand quarry moisture while heating, and the subsequent formation of raw its hydrothermal treatment in an autoclave [2].
The main significant disadvantages of this method are:
- Raw material mixture provides brand bricks strength greater than 150;
- Large energy process.
The present invention eliminates the above drawbacks.
The present invention is to increase the strength of silica brick, its frost resistance and simplify its manufacturing process.
The object is achieved by a method for producing silica brick comprising preparing a binder by treating the carbide lime or mixed with sand, the preparation of the raw material mixture by mixing the resulting binder with sand quarry moisture while heating, followed by molding raw and hydrothermal treatment in an autoclave, using carbide lime containing active CaO and MgO 60-70%, with a sand quarry humidity fineness modulus 0.7-1.1, treating said carbide lime is carried out until the specific surface 9000-10000 cm 2 / g, and its mixture with sand to surface area - 4500-6000 cm 2 / g, while heating up the next 70-80ºS their ratio, wt%: 11-22 said binder, said sand 78-89.. In addition, the molding is performed at a crude mixture of 6.0-8.5% moisture, temperature 50-60ºS and the pressing pressure of 20-25 MPa.
On the basis of the patent and technical analysis, but also from the experience of the production of sand-lime brick was not aware of the identical to the proposed method for producing such a brick.
The above "essence" of the process and its significant new features in conjunction with the known method of providing this level of invention. Each of the new essential features needed, and everything together - are sufficient to solve the invention aim.
Thus, the legitimate conclusion about conformity of the claimed technical solution to the criterion "Inventive Step".
The proposed solution to the inherent set of essential features can be repeatedly implemented to give the same effect - the manufacture of high-strength and frost-resistant silicate bricks, while himself a brick manufacturing process is simplified compared with the same methods, that allows you to conclude that the proposed technical to the criterion of "industrial applicability".
The present invention is tested in a production environment JSC "plinth" in Astrakhan. The following are testing results (see. Table.).
example 1
The binder was prepared by treating the carbide lime with an active content of CaO and MgO 60% and the specific surface area of 10,000 cm 2 / g, and the raw material mixture - mixing said binder with sand quarry humidity and fineness modulus of 1.1 while heating to 70 ° C in a ratio of steaming ., wt%:
11.0 Astringent
Sand 89.0
The resulting raw material mixture was moistened to a moisture content of 6.0% and formed from a mixture of the crude product at 50 ° C under a pressure of 25 MPa the pressing and then it was subjected to a hydrothermal treatment in an autoclave at 1.2 MPa by mode 2.0 + 5.0 + 2 0 hour.
example 2
The binder was prepared by treating the carbide lime with an active content of MgO and CaO, 70% to the specific surface area 9000 cm 2 / g, and the raw material mixture prepared by mixing said binder with sand quarry humidity and fineness modulus of 0.7 while heating to 80 ° C in a ratio of steaming ., wt%:
15.0 Astringent
Sand 85.0
The feed mixture was adjusted to a moisture content of 7.5% and formed from a mixture of the crude product at 60 ° C under a pressure of 20 MPa the pressing and then it was subjected to a hydrothermal treatment in an autoclave at 1.2 MPa by mode 2.5 + 4.0 + 2 0 hour.
example 3
The binder was prepared by treating the carbide lime with an active content of CaO and MgO 65% and the specific surface area of 9500 cm 2 / g. The resulting binder was mixed with sand quarry humidity and fineness modulus of 0.8 while heating to 70 ° C in a ratio of steaming, wt.%:
22.0 Astringent
Sand 78.0
The resulting raw material mixture was moistened to a moisture content of 8.5% and formed from a mixture of the crude product at 50 ° C under a pressure of 20 MPa the pressing, followed by hydrothermal treatment in an autoclave at 1.2 MPa by mode 2.0 + 5.0 + 2.0 hour.
example 4
The binder was prepared by treating the carbide lime with an active content of CaO and MgO, and 70% moisture sand quarry and fineness modulus of 1.1 to a specific surface of 6000 cm 2 / g, and the raw material mixture - obtained by mixing the sand with the binder used for the preparation of the binder while heating acute steam to 70 ° C in a ratio, wt.%:
11.0 Astringent
Sand 89.0
The feed mixture was moistened to a moisture content of 7.0% and formed from a mixture of the crude product at 50 ° C under a pressure of 25 MPa the pressing and then subjected to a hydrothermal treatment at 1.2 MPa by mode 2.0 + 5.0 + 2.0 hr.
example 5
The binder was prepared by treating the carbide lime containing 60% lime and sand quarry humidity and fineness modulus of 0.7 to a specific surface of 5000 cm 2 / g. The feed mixture was prepared by mixing the resulting binder with the sand pit and humidity and fineness modulus of 0.7 while heating to 80 ° C in a ratio of steaming, wt.%:
16.0 Astringent
Sand 84.0
Because the raw mix, moisturized to 8.0% with a temperature of 60 ° C, spun raw forging pressure at 20 MPa and subjected to a hydrothermal treatment in an autoclave at 1.2 MPa by mode 2.5 + 4.0 + 2.0 hr .
example 6
The binder was prepared from the carbide lime with an active content of CaO and MgO, and 65% moisture sand quarry and fineness modulus of 0.9 to treatment the specific surface area of 4500 cm 2 / g, and the raw material mixture obtained by mixing the resulting binder with the sand used to prepare the binder while heating steaming up to 75 ° C in a ratio of wt.%:
22.0 Astringent
Sand 78.0
Of hydrated to a moisture content of 8.5% of the mixture at 55 ° C formed from the crude mixture under forging pressure of 20 MPa and subjected to a hydrothermal treatment in an autoclave at 1.2 MPa by mode 2.0 + 4.0 + 2.0 hr.
example 7
Of the carbide lime with an active content of CaO and MgO, and 60% humidity and sand quarry 1.1 fineness modulus binder was prepared at a ratio of lime and sand of 1: 1 was mixed with sand and the same humidity ratio in module size binder - 20% sand - rest.
The resulting mixture is moistened to 6.0% and the raw spun at forging a pressure of 25 MPa. The resulting crude product was subjected to hydrothermal treatment in an autoclave, as in Example 1.
The advantages over the prototype of the claimed method consists in the fact that:
1. obtained by the process of the raw material mixture ensures the production of sand-lime bricks with compressive strength of more than 40.0 MPa and not less than 40 frost cycles.
2. It reduces the energy consumption in the production of silica brick by 15-20%.
3. Carbide lime is a price of 1.5-2.0 times lower than quicklime, which significantly reduces the cost of sand-lime brick.
INFORMATION SOURCES
1. RU Patent number 2162454 C1, 27.01.2001.
2. Khavkin LM Technology of silicate bricks. - M .: Stroyizdat, 1982, p.22, 64, 80-81, 86, 95, 106, 122, 127, 182, 241.
CLAIM
1. A process for producing silica brick comprising preparing a binder by treating the carbide lime or mixed with sand, the preparation of the raw mixture obtained by mixing the binder with sand quarry moisture while heating, followed by molding its raw and hydrothermal treatment in an autoclave, characterized in that the carbide active lime content of CaO and MgO 60 - 70% moisture with quarry sand fineness modulus of 0.7 - 1.1, the said treatment is carried out before the carbide lime specific surface area 9000 - 10000 cm 2 / g, and its mixture with sand to a specific surface - 4500 - 6000 cm 2 / g, while heating to 70 - 80 ° C in the next their ratio, wt.%:
Said binder 11 - 22
This sand 78 - 89
2. The method of claim 1, wherein the forming raw mixture is performed at a humidity of 6.0 -. 8.5%, temperature 50 - 60 ° C and the pressing pressure of 20 - 25 MPa.
print version
Publication date 21.12.2006gg
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