RU2057742C1 - Raw mixture for making ash-ceramic heat-insulating articles - Google Patents

Abstract

FIELD: building industry. SUBSTANCE: raw mixture has refractory clay 2-50 wt.-% and light fraction of fly ash from heat and power plant 50-98 wt. -%. Prepared material shows density 0.5-0.75 g/cm³, bending strength 0.5-4.0 MPa, heat conductivity 0.17-0.24 W/m x K. EFFECT: enhanced quality of raw mixture. 2 tbl

Description

The invention relates to the building materials industry and can be used in the manufacture of products for thermal insulation furnace units and power equipment with insulated surface temperature to 1150 ° ^C.

 Wall cladding materials based on ceramic-gold components are known, including a clay component and an ash component in the form of TPP ash.

 Ash TPP, including a light ash fraction (microsphere), the volume of which does not exceed 5% of the total ash volume in the ash component, is used in the known compositions as a flux-forming additive, and is subjected to grinding during the preparation of raw materials in the total mass, providing increased mechanical strength ceramic material.

 The materials obtained from known raw material mixtures are not heat insulating.

 Closest to the proposed is a raw material mixture for the manufacture of ceramic products, including 2-50 wt. clay component and 50-98 wt. ash component.

 In the known raw material mixture, dry ash is used in the form of a powder fraction obtained by fine grinding at the stage of preparation of the raw material. Solving the problem of increasing mechanical strength and reducing water absorption, this raw material mixture does not provide high thermal insulation properties of the resulting wall cladding materials.

 The objective of the invention is to increase the insulating properties of ceramic material.

 The problem is solved when creating a raw material mixture for the manufacture of ceramic-ceramic insulating products, including 2-50 wt. clay component and 50-98 wt. ash component, due to the use of refractory clay as the clay component, and as the ash component of the light fraction of the entrainment zone of coal-fired thermal power plants.

 The light fraction of the zone is a hollow spherical particles, the so-called microspheres.

The main characteristics of LFZ are as follows:
particle size 40-400 microns;
particle wall thickness 5-10 microns;
bulk density of 250-350 kg / m;
melting point 1150-1200 ^about C.

 The LFZ content in the ash is 1-5% of the total ash mass. LFZ can be considered as expanded material obtained in the process of burning solid fuel at thermal power plants. The chemical composition of LFZ is close to the chemical composition of clays (see Table 1).

 Getting the proposed raw mix is as follows.

 In the process of burning solid fuel at thermal power plants, water is formed that contains hollow spherical particles in the total mass, which can be considered as expanded material, which is an integral part of the heat-insulating material.

 These light fractions are isolated, for example, by a reagent-free flotation method.

 Then there is a mixing of the constituent components of LFZ with refractory clay and water in a forced-action mixer and semi-dry pressing.

 It is possible to obtain a heat-insulating material with 100% use of light ash fractions, if the conditions of use of such material do not require special strength.

 The main characteristics of the ceramic material obtained by the method of semi-dry pressing at different percentages of LFZ are given in Table 2.

Claims (1)

 RAW MATERIAL MIXTURE FOR THE PRODUCTION OF GOLD-CERAMIC HEAT-INSULATING PRODUCTS, including 2 50 wt. clay component and 50 98 wt. ash component, characterized in that as the clay component it contains refractory clay, and as the ash component a light fraction of fly ash of thermal power plants.

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