Refractory composition

 

(57) Abstract:

The inventive refractory composition for the manufacture of mortars, protective coverings, coatings and refractory products contains, wt%: fly ash refractory, ultrakill with the spherical shape of the grains, with the content of Fe2O3not more than 5% of 10 - 80, fire clay 11 - 60, fireclay - the rest is up to 100. The refractory composition may further contain a plasticizer in an amount of 0.1 - 1% by weight of the composition, bauxite or alumina, or aluminum hydroxide, and phosphate ligament or liquid glass in an amount of 5 to 30% by weight of the composition. Physico-mechanical properties: mechanical strength in compression 18 - 95 MPa, the resistance 1610 - 1750oC, the permeability of 0.5 - 1.5 LM/m2mm water. Art., including 6 C.p. f-crystals, 2 tab.

The invention relates to the production of refractory materials and can be used for making mortars, protective coatings, coatings, insulation, and refractory goods bricks, blocks and others).

Known refractory mass, mainly for the insulation of the outer surface of the walls and other elements of open-hearth furnaces-containing, by weight. liquid glass 10 12, clay refractory 5 8, ash-University, which is of low strength and high intensity, as well as the cost due to the high content of aluminosilicate clay.

Known refractory concrete mix containing the following components, wt. including fireclay 56 83, clay refractory 4 8, phosphate binder 5 18, kaolin 8 18. The resulting concrete has a high strength (compressive 25 55 MPa) and permeability, as well as the cost (2).

Known refractory composition for coating the lining of steam boilers having a composition, wt. chamotte 70 80 30 70% Al2O3and TiO2, Portland cement 20 25 or fused alumina cement and fly ash 2 8. The chemical composition of the fly ash, wt. 50 SiO2, 37 Al2O3TiO2, 3 Fe2O3TO 0.6 SO4, 0,5 CaO, MgO Of 0.1. The coating has high heat resistance and wear resistance, and provides long service lining at temperatures up to 1100oC (3).

The disadvantage of the composition is the high cost and limited use in thermal units, temperature service which exceeds 1100oC.

The closest analogue to the invention is refractory composition

concrete for lining gasosaurus mine systems of steam boilers, comprising, by weight. ohaupo is inoe to 100% (4).

Received from the specified mix concrete is characterized by high strength (30 to 50 MPa) and low conductivity (coefficient of thermal conductivity of 0.6 to 0.9 W/MK), but it has a high permeability, which is a disadvantage.

The invention is directed to creating a cheaper refractory compositions, mainly for laying of aluminosilicate refractory products, high gas impermeability and adhesion, as well as good physical and mechanical properties.

The technical result is achieved due to the fact that the refractory composition, mainly for masonry thermal units, contains the following components, wt. ash refractory, ultracycle with the spherical shape of the grains with Fe2O3no more than 5% 10 80, fire clay 11 60, fireclay rest up to 100% of the Refractory composition may further contain 0.1 to 1.0 percent by weight of the composition (over 100%) plasticizer, which can be used plasticizer C-3 on the basis of the sodium salts of the condensation product of naphthalenesulfonate with formaldehyde. In addition, to improve the fire resistance of the composition can optionally contain bauxite or technical linenoise may contain additional phosphate bond in an amount of 5 to 30% by weight of the refractory composition (over 100% ). As phosphate chords you can use the H3PO4or Al(H2PO4)3. Or refractory composition may further comprise a liquid glass in an amount of 10 to 30 (by weight composition).

Different refractory composition according to the invention from the closest analogue of the fact that it contains fly ash refractory, ultrakill with the spherical shape of the grains with Fe2O3no more than 5% and the ratio of components.

For the preparation of refractory compositions are used: fly ash refractory, ultrakill with the spherical shape of the grains chemical composition, wt. 57,9 SiO2, 3 Fe2O3, 2 CaO, 36 Al2O3, MgO of 0.5, 0,2 K2O, and 0.2 Na2O, 0,2 SO3the specific surface of the fly ash 2000 cm2/g, melting point 1680oC;

clay refractory Latnenskogo field;

the aluminosilicate clay, stamps SGR, fraction of not more than 2 mm

For the preparation of masonry mortar, coating, solution coating composition is mixed with water in an amount of 20 to 50% by weight of the composition (over 100%).

Prepare refractory composition by mixing the components in the mixer of any type to obtain homogeneity, blocks and others) the composition is mixed with water in an amount of 3

15% (over 100%) depending on the chosen method of forming the desired humidity. Molding can be accomplished in any known manner. The molded product is dried and calcined at 1200 1380oC.

In table. 1 shows the compositions of refractory compositions, and table. 2 physico-mechanical properties.

When using this composition as masonry mortar for the construction of thermal aggregates seam thickness ranges from 2.5 to 4.5 mm

As can be seen from the table. 1 and 2, the composition according to the invention allows to improve the performance properties of thermal units.

The additional introduction of the refractory composition of the plasticizer, in addition to improving plasticity, has a positive effect on reducing the permeability and increasing the strength of the coupling with a brick, well fills irregularities, gives a thin seam.

Introduction aluminum-containing additives: bauxite, technical alumina or aluminium hydroxide increases the resistance of the composition to 1650 1750oC, and the additional presence of phosphate ligament provides increased strength after firing, and after drying, which is very important when in use.">

Additional introduction into the composition of liquid glass, as well as phosphate bundle allows to obtain non-fired refractory products, coating and mortars.

1. Refractory composition mainly for masonry thermal units, including clay, refractory clay, ash from power plants, characterized in that it contains ash from power plants, refractory, ultrakill with the spherical shape of the grains, with the content of Fe2ABOUT3no more than 5% in the following ratio, wt.

This ash 10 80

Refractory clay 11 60

Fireclay Else

2. The composition according to p. 1, characterized in that it further contains a plasticizer in an amount of 0.1 to 1.0% by weight of the refractory composition (over 100% ).

3. The composition according to PP.1 and 2, characterized in that the plasticizer used LST and Na2CO3in the ratio of 2 3 or plasticizer With 3 on the basis of the sodium salts of the condensation product of naphthalenesulfonate with formaldehyde.

4. The composition according to PP. 1 to 3, characterized in that it further comprises bauxite, or technical alumina, or aluminum hydroxide in an amount of 5 to 30% by weight of the refractory composition (over 100%).

5. The composition according to PP. 1 to 4, characterized by 100%).

6. The composition according to PP. 1 to 5, characterized in that as phosphate ligament using H3RHO4or Al(H2PO4)3< / BR>
7. The composition according to PP. 1 to 4, characterized in that it further comprises a liquid glass in an amount of 10 to 30% by weight of the refractory composition (over 100%).

 

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