Raw mix for manufacturing of ceramic thermal insulating building materials

FIELD: construction.

SUBSTANCE: raw mix contains the following components, wt %: argillites - 69.0-74.8; diopside-containing rock - 10-15; crushed glass - 9.5-10.5; building gypsum - 4.92-5.1; alumnium powder - 0.58-0.6; sodium hydroxide, 2H solution - 29.6-30.0% above 100%, of dry mixture, V/G - 0.42-0.45.

EFFECT: increased strength of porous items with preservation of their density and temperature of annealing.

3 tbl

 

The invention relates to the construction materials industry and can be used for the production of insulating ceramics.

Famous raw mixture comprising the ingredients the next time their ratio, wt.%: loam 20-25; aluminum powder 0,06-0,10; ground lime 0,7-1,0; shale - waste recycling of bituminous shale or waste rock 20-25; metallurgical carbonateitamin slag 22-23; superplasticizer based on sodium salts, the polycondensation product of naphthalenesulfonate and formaldehyde With 3 0,18-0,02; water - the rest (USSR Author's certificate No. 1678810 A1, priority date 27.04.1989, publication date 23.09.1991, the authors Burlakov G.S., and others, EN).

The disadvantage of the raw mix is a selection of aggressive gases during firing of ceramic mixtures using polymers, as well as increased density of the final product - 640 kg/m3.

Closest to the technical essence is adopted as the prototype of a raw material mixture consisting of clay component - loam, corrective additive zeolite when Vodopyanov respect To/G=0,8-1,0, astringent, while performing the role of alkaline additives, is it lime and additives of blowing agent is aluminum powder, in the following ratio, wt.%: loam - 83,3-75,4; zeolite 12,50-18,85; aluminum is the first powder - 0,08-0,11; ground lime 4,12-5,64 (RF Patent No. 2281268 C2, the priority date of 04.11.2004, date of publication, 10.08.2006, the authors Zavadsky VF and others, RU, prototype)

The disadvantage of the prototype is a low strength products at a density 440-640 kg/m3after firing at a temperature of 950C - 2-2,2 MPa specified in the abstract of [Potro NB Porous ceramics (composition, technology, properties): author. dis...Kida. technology. Sciences / Nebuta. - Novosibirsk, 2004 - 24 C.].

The objective of the invention is to increase the strength of porous products while maintaining their firing temperature and density.

To solve the problem of raw mix for the production of ceramic insulation construction materials, including clay component, corrective additive, an alkaline additive, binder and the blowing agent is aluminum powder according to the invention, as the clay component it contains claystone, as a corrective additive - typedstream rock and glass, as an alkaline additive - 2 n sodium hydroxide solution as a binder - plaster construction, when Vodopyanov the ratio of 0.42-0.45 and the following ratio, wt.%:

M69,0-74,8
Dieselstrasse on the ode 10-15
Cullet9,5-10,5
Gypsum construction4,92-5,1
Aluminum powder0,58-0,6
Sodium hydroxide, 2N solution (over 100%)29,6-30,0%

To implement the invention in the raw material mixture used in the following components.

As clay rocks use mudstones Montenegrin (Khakassia), granulometric composition of which varies from coarse to disperse with the content of clay particles from 26.5 to 47.5%, sand from 45 to 50%. The chemical composition of mudstones is within the following limits, wt.%: SiO2- 51,86-58,12; Al2O3- 15,7-20,35; Fe2O3- 5,57-6,01; Cao - 1,73-3,17; MgO - 2,21-1,66; Na2O - 1,2-1,8;2O - 2,3-2,9, PPP - 8,2-12. The claystone is subjected to crushing, drying and grinding to pass through a sieve with a mesh size of less than 0,16 mm

As a corrective additives used typedstream breed and broken glass from a mixture of window and container glass, ground to the residue not more than 5% on a sieve with a mesh size of 0,063 mm

With the introduction of the clay suspension it supplements dieselstrasse rocks and broken glass facilitated the process wspanialy is due to the action of additives as atomically, accelerated recruitment process structural strength of foamed mass, which contributes to the decrease in precipitation porous mixture after expansion and reduction of the density value of the products. In the process of burning products additive dieselstrasse rocks, mainly composed of diopside (92-95%), exhibiting the properties structure-forming additives that enhance the durability of products while maintaining high porosity, and the addition of cullet as plantoprazole component contributes to low-temperature sintering products.

Table 1 shows the chemical composition used in the raw mix Montenegrin claystone (Khakassia), dieselstrasse rocks and broken glass.

As a blowing agent for polsacie raw mix used aluminum powder grade PAP - 2 (GOST 5494-95). The specific surface of the aluminum powder is 5500-6000 cm2/g, the content of active aluminum in it is 87-98,5%.

Ensuring alkaline mixture reaches the change of sodium hydroxide, which is injected in the form of a 2N solution in excess of 100% of the dry mixture.

As the binder, providing a consolidation of the porous structure of the mixture after foaming, apply gypsum building brand G-6 meeting the requirements of GOST 1308-81, the beginning of the seizure, which extending t is 3-11 min, the end - 7-15 minutes

The technology of manufacture of the raw material mixture is carried out according to the following scheme.

In pre-cooked mudstones add plaster construction standard fineness of grind, fine typedstream rocks and broken glass and mix them in a dry condition. Then the mixture is injected heated to 50-60C water and the required amount of 2 n sodium hydroxide solution, then add aluminum powder. Stirring is carried out until a homogeneous fluid mass. Received watery-viscous mass is poured into a mold, filling its volume to 2/3 of the height to sample and determine their properties. The process of polsacie and heaves mass lasts 30-40 minutes and Then the sample is subjected to drying at a temperature of 70-90With a duration of 10-12 hours. After drying, forms removed, and the product is calcined for 8 hours at a temperature of 950C.

The compounds of the inventive mixtures and prototype are shown in table 2.

Table 2
ComponentsContent, wt.% ofPrototype %
1234 5
Mudstones66,969,072,474,881,1
Dieselstrasse breed171512105
Cullet1110,510,09,58
Gypsum Mr. 64,534,925,015,10of 5.29
Sodium hydroxide, 2 N.29,429,629,83030,2
Aluminum powder0,570,580,590,600,61 0,08-0,11
In/G0,480,420,430,450,470,8-1,0
Loam75,40-87,61
Zeolite rock12,50-18,85
Ground lime4,12-5,64

For example, to implement technical solutions - composition No. 2 crushed claystone in the amount of 69%, gypsum building brand G-6 - 4,92%, it is typedstream breed is 15% and it cullet to 10.5% was mixed in a dry state for 5 minutes, Heated to 50-60C water at Vodopyanov the ratio of 0.42 and 2 n sodium hydroxide solution in the amount of 29.6% was introduced into the mixture and stirred for 2 min, then was added aluminum the best powder in the amount of 0.58% and stirred for another 2 min to obtain a homogeneous fluid mass. Then, the raw material mixture is poured into molds, filling to 2/3 of the height to get the samples and their testing in the mechanical strength and other properties. The process of polsacie and foaming lasted 35 minutes Later, the samples were dried at 70C for 10 h, then immediately demoulded was subjected to annealing for 8 hours at a temperature of 950C. the Prepared samples were tested to determine their properties.

Physico-mechanical properties of the products obtained from the following table 2 compositions shown in table 3.

Table 3
PropertiesIndicators for compositionThe placeholder
12345
Firing temperature, C950950950950950950
Density, kg/m3600550500440 560440-650
Compressive strength, MPa2,7a 4.94,13,71,92,0-2,2

The results are shown in table 3, show that the proposed formulations of the inventive raw mixture have a higher strength products with the same density than known composition. Table 3 also shows that the product of the mixture ratio different from the ratio of components in the proposed structure, have lower strength and higher density (compositions No. 1 and No. 5).

Thus, the obtained raw material mixture is optimal composition for the manufacture of ceramic heat-insulating building material of high strength with density 440-550 kg/m3.

Raw mix for the production of ceramic insulation construction materials, including clay component, corrective additive, an alkaline additive, binder and the blowing agent is aluminum powder, characterized in that as the clay component it contains claystone, as a corrective additive - typedstream rock and glass, as an alkaline additive - nectar hydroxide NAT the Oia, as knitting - plaster construction, when Vodopyanov the ratio of 0.42-0.45 and the following ratio, wt.%:

M69,0-74,8
Dieselstrasse breed10-15
Cullet9,5-10,5
Gypsum construction4,92-5,1
Aluminum powder0,58-0,6
Sodium hydroxide, nectar (over 100%)29,6-30,0



 

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