BG716Y1 - Heat-insulation material - Google Patents

Abstract

The heat-insulation material includes pyrogenic metallic oxide - quartz sand for a casting mould line, refractory, binder and cellulose. The components of the material are in the following quantitative ratios, in wt.%: quartz sand for a casting moulding line from 60 to 95, refractory from 2 to 30, binder from 2 to 15 and cellulose from 1 to 20. The refractory material can be lightweight, such as light fireclay, pearlite, ashes or vermiculite, or be normal, in particular fireclay, magnesite or dolomite. It is possible that part of the cellulose quantity should be of waste paper, and it is particularly suitable to be up to 50% of the total cellulose quantity.

Description

Technical field

The utility model relates to thermal insulation material for the manufacture of dead casting heads in metallurgy, and in particular for the production of molds for steel blocks.

BACKGROUND OF THE INVENTION

From published application EP 0 561 542 A1 is known thermal insulation material including pyrogenic metal oxide, refractory material and binder. Pyrogenic metal oxide may be pyrogenic quartz and / or pyrogenic aluminum. The refractory material may be a light refractory material, in particular light chamotte, perlite and / or ash. The refractory may also be a normal refractory, in particular chamotte, magnesite or dolomite.

A disadvantage of the known thermal insulation material is the use of special raw materials for its production, which makes it more expensive and makes it economically less profitable. In addition, for the formation of slabs of the known material, the composition includes plastic components, which are preferably ceramic binders, i.e. metal oxides which react with the other components under the action of heat and thus cause a binding effect. Such binders are expensive and, accordingly, their inclusion in the composition of the known thermal insulation material makes it more expensive.

The technical nature of the utility model

The problem that is solved with the present utility model is the creation of a thermal insulation material, the production of which is economically advantageous and which allows the formation of insulating panels of any shape.

A useful model relates to a thermal insulation material comprising pyrogenic metal oxide, a refractory material and a binder. The thermal insulation material is characterized by the fact that pyrogenic metal oxide is quartz sand from the foundry molding lines and the material also includes cellulose.

In a preferred embodiment, the components of the thermal insulation material are in the following quantitative proportions by weight:

quartz sand from foundry molding lines 60 to 95;

refractory material: 2 to 30; binder: 2 to 15; cellulose: from 1 to 20.

It is appropriate that the refractory material is a light refractory material, in particular light chamotte, perlite, ash and / or vermiculite.

It is also appropriate that the refractory material be a normal refractory material, in particular chamotte, magnesite or dolomite.

In another preferred embodiment of the thermal insulation material, part of the amount of cellulose is waste paper.

It is appropriate that the waste paper is up to 50% of the total pulp.

The advantages of the utility model lie in the creation of thermal insulation material, the main component of which is waste product from foundry molding lines, which greatly reduces the value of insulation plates for dead casting heads. In addition, insulation panels can be formed in any shape due to the incorporation of cellulose into the thermal insulation material. As a consequence, permanent and complete protection of the casting mold locations with a higher temperature from heat loss is achieved.

Examples of implementation of the utility model

Thermal insulation plates for dead heads of steel blocks and castings are obtained by preparing the individual components of the thermal insulation material to the specified granulometry by grinding and sieving in the quantities provided. The pyrogenic metal oxide and the refractory material are then mixed dry to form the first dry fraction. The binder can be added to this first fraction or mixed with the cellulose by adding water (wet fraction). The dry and wet fractions were then mixed and the resulting mixture was homogenized. The homogeneous mixture is poured into a mold where it is pressed. After compression, the resulting thermal insulation board is dried and baked.

The pressure by which the thermo-insulating material is pressed into the mold depends on the volume of the plate being manufactured, the larger the volume, the greater the pressure.

The drying temperature is below 120 ° C and the firing temperature depends on the temperature properties of the binder.

Below are exemplary compositions of the thermal insulation material according to the utility model.

Example 1

The thermal insulation material has a composition by weight:

quartz sand from foundry molding lines7 3;

refractory material11;

binder8;

fresh cellulose4;

secondary (waste) paper4;

The thermal insulation material of such composition has a high density, high strength, but is relatively brittle.

Example 2

The thermal insulation material has a composition in% by weight of quartz sand from a foundry molding line, 63;

refractory material27;

binder5;

fresh cellulose5;

This thermal insulation material has a lower density but is more ductile and therefore suitable for the production of insulating panels of a more complex shape.

Example 3

The thermal insulation material has a composition by weight:

quartz sand from foundry molding line63;

refractory material15;

binder12;

cellulose: fresh10;

A thermal insulation material of such composition has increased plastic properties and reduced density.

The exemplary compositions given are merely illustrative and do not limit the scope of protection as defined in the claims.

Claims (6)

Claims 1. Thermal insulation material comprising pyrogenic metallic oxide, a refractory material and a binder characterized by 15 _{is a T} oic that the fumed metal oxide is silica sand of the casting mold lines, and in that it includes cellulose. Thermal insulation material according to claim 1, characterized in that its components are in the following proportions by weight: quartz sand from foundry molding lines: refractory material: binder: cellulose: from 60 to 95; from 2 to 30; from 2 to 15; from 1 to 20. Thermal insulation material according to claim 1 or 2, characterized in that the refractory material is a light refractory material, in particular light chamotte, perlite, ash and / or vermecolite. Thermal insulation material according to claim 1 or 2, characterized in that the refractory material is a normal refractory material, in particular chamotte, magnesite or dolomite. Thermal insulation material according to one of the preceding claims, characterized in that part of the amount of cellulose is waste paper. Thermal insulation material according to claim 5, characterized in that the waste paper is up to 50% of the total amount of cellulose.