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INVENTION
Russian Federation Patent RU2281268

The raw material mixture for ceramic thermal insulation BUILDING MATERIALS

Name of the inventor: Zawadzki Vladimir Fedorovich (RU); Putro Natalia B.
The name of the patentee: Novosibirsk State Architectural University (Sibstrin) (RU); Zawadzki Vladimir Fedorovich (RU); Putro Natalia B.
Address for correspondence: 630008, Novosibirsk, st. Leningrad, 113 NSABU, LHP department
Starting date of the patent: 2004.11.04

The invention relates to the building materials industry and can be used in the manufacture of insulating ceramics. The technical result of the invention is to reduce the average density of ceramic insulating materials. The raw material mixture for the production of ceramic heat-insulating building materials contain loam, aluminum powder, ground lime, water and zeolite with respect vodoglinyanom / D = 0.8-1.0 and the following ratio, wt%: loam - 83,3-75. ,4; zeolite - 12,50-18,85; aluminum powder - 0,08-0,11; Powdered lime - 4,12-5,64.

DESCRIPTION OF THE INVENTION

The invention relates to the building materials industry and can be used in the manufacture of insulating ceramics.

Known raw mixture comprising the following components, wt%: 56,5-64,8 clay;. aluminum powder 0.2-0.5; liquid glass production waste 10-15; siliceous limestone 15-20; ground lime 3-8; electroplating waste - hydroxides of iron, zinc, nickel, copper, 2-5 (AS 1414835 A1, C 04 B 38/02, 33 // 00, 29 Bull., 1988).

A disadvantage of the known feed mixture is a need to use as the main component true clay loam and instead electroplating waste - hydroxides of iron, zinc, nickel, copper, and it will require further processing for use in the raw mix.

The closest the technical essence is a raw material mixture comprising, by weight%: 20-25 loam;. aluminum powder 0,06-0,10; alkali - ground lime 0.7-1.0; shales - waste recycling or bituminous shale gangue 20-25; Steel slag karbonatosoderzhaschy 22-23; superplasticizer based on sodium salts - condensation product of formaldehyde and naftalinosulfokisloty-3 0,018-0,02; water the rest (AS 1678810 A1, C 04 B 38/00, Bulletin №35, 1991 -. a prototype).

The disadvantage of the closest mixture is its multi-component and isolating corrosive gases during firing of ceramic mixtures with polymers and a high density of the finished products.

The technical problem of the invention - to provide the raw material mixture the optimum composition to reduce the average density of ceramic insulating materials.

The technical problem is achieved by the fact that the raw material mixture for the production of ceramic heat-insulating building materials, including clay loam, aluminum powder, ground lime, and water, comprises a zeolite with respect vodoglinyanom / D = 0.8-1.0 and the following ratio, wt.% : loam - 83,3-75,4; zeolite - 12,5-18,85; aluminum powder - 0,08-0,11; Powdered lime - 4,12-5,64.

The raw material mixture used aluminum powder PAP-1 grade (GOST 5494-95) as a gassing agent for porization raw mix. Aluminium powder contains 87-98,5% active alumina, and has a specific surface 5500-6000 cm ² / g. To create an alkaline environment in the clay slurry was added milled lime.

The raw material mixture as a stabilizer and reduce shrinkage weight porous structure zeolite used with a density of 1.9-2.3 g / cm ^3, ground to a specific surface 2500-3000 cm ² / g.

With the introduction of loam suspension from fine zeolite its strength approaches the strength parameters of clay suspensions and accelerated thixotropic hardening process, the higher the rate of recruitment of structural strength, the less the effect of sedimentation porous raw mix, less the value of the average density and higher mechanical strength of the ceramic heat-insulating building materials.

As shale loam use of the Novosibirsk region, which are dusty and contain in their composition of 10-14% and 63-77% of clayey silt. The chemical composition of the loam is in the following range,%: SiO ₂ - 58,61-64,4; Fe ₂ O ₃ - 5,17-5,71; Al ₂ O ₃ - 11,17-13,8; CaO - 2,99-5,05; MgO - 2,26-3,47; R ₂ O - 2,38-4,28; LOI - 8,26-11,0. Loam is crushed, dried, milled and sieved to a specific surface 2500-3000 cm ² / g.

Food Technology feed mixture is carried out according to the following general scheme: loam added prereduced fine ground zeolite lime milled and mixed in a dry state. Mixing water, having a temperature of 50-60 ° C, with respect vodoglinyanom V / H = 0.8 ... 1.0 is introduced into the mixture, then add the aluminum powder.

Stirring was performed until a homogeneous fluid mass.

The thus obtained raw material mixture by an injection molding technology poured into the mold, filling it with the volume of two thirds the height for the samples and their testing for mechanical strength and other characteristics. Process porization and swelling lasts 30-40 minutes. The samples are dried at 50-70 ° C for 24 hours, then in a raspalublennom calcined for 8 hours at 950 ° C.

For example, in the proposed technical solution in an amount of pulverized loam 79.31%, 15.85% zeolite and milled 4.75% lime mixed in the dry state for 3 minutes. Mixing water, having a temperature of 50-60 ° C, with respect vodoglinyanom / D = 0.9 were introduced into the mixture, followed by addition of aluminum powder in an amount of 0.09% and mixed for 2 minutes to obtain a homogeneous fluid mass with a moisture content of 45 50%. Next, the raw mix poured into the mold, filling it with the volume of two thirds the height for the samples and their testing for mechanical strength and other characteristics. Process porization and swelling lasted 40 minutes. The samples were dried at 50 ° C for 24 hours, then in a raspalublennom calcined for 8 hours at 950 ° C. Compositions of raw mixtures are given in Table 1 below.

The results in Table 2 show that the known compound has a higher firing temperature and a greater average density product than the proposed composition of the raw mix.

Thus obtained optimal raw meal composition for the production of ceramic heat-insulating building materials lower average density.

CLAIM

The raw material mixture for the production of ceramic heat-insulating building materials comprising loam, aluminum powder, ground lime and water characterized in that it contains a zeolite with respect vodoglinyanom B: F = 0.8-1.0 and the following component ratio, wt.%:

print version
Publication date 18.01.2007gg

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