CS252540B1 - Material for production of pre-annealed refractory concrete moulded bricks' making in combination with pyrostator tubes - Google Patents

Abstract

The solution concerns the mass for making pre-annealed incandescent bricks in combination with pyrostatic tubes for use in electric hybrid tiles as a heating beam support. To there was no loss of strength or disruption blocks due to refractory concrete shrinkage mass at the annealing, the mass is solved song. The dry concrete mix contains 3.9 to 4.1 wt. mikroplniva s fraction to 0.1 mm, 45 to 47 wt. stone with a fraction of 0.1 to 1.6% by weight, 24.5 % to 25.5 wt. aggregates with a fraction of 1.6 to 5.0 mm and 24.5 to 25.5 wt. alumina cement. Blocks in which they are already in use to produce a built-in pyrostatic tube are annealed at 450 ° C.

Description

The present invention relates to a mass for producing overlaminated refractory blocks in combination with pyrostatic tubes for use in electric hybrid tiles as a heater beam. In order to prevent loss of strength or damage to the blocks due to shrinkage of the refractory material during the overheating, the mass composition is solved. The dry refractory mix contains 3.9 to 4.1 wt. Microfillers with a fraction of up to 0.1 mm, 45 to 47 wt. aggregates with a fraction of 0.1 to 1.6 wt.%, 24.5 to 25.5 wt. Aggregates with a fraction of 1.6 to 5.0 mm and 24.5 to 25.5 wt. aluminous cement. Blocks, in which the pyrostatic tubes are already installed, are annealed to 450 ° C.

25254G

The present invention provides a mass for producing overheated refractory blocks in combination with pyrostatic tubes.

In addition to conventional refractory building materials, refractory concrete elements are increasingly being used in heat-technical equipment. Refractory blocks are produced by compaction in molds and their material basis is refractory aggregate and hydraulic bonding. In its hydraulic bond, the refractory concrete contains chemically bound water and the non-prolonged blocks cannot be used in such thermal installations where the release of water is not permissible. It has been experimentally verified that chemically bound water from refractory concrete begins to escape at 130 degrees Celsius and the complete release of water is at 800 ° C. From the determination of the gravimetric thermal analysis (VTAj) it is possible to define the processing temperature - overtaking depending on the residual value of chemically bound water. , which are thermally and dimensionally stabilized, due to the different stresses during shrinkage of the refractory concrete, the strength and the erosion of the block are reduced.

The unfavorable effect of shrinkage of the refractory concrete during the elongation can be reduced by a suitable granular treatment of the aggregate and the consistency of the damp refractory concrete mixture intended for the production of blocks according to the present invention. microfillers up to 0.1 mm, 45 to 47 wt. 0.1 to 1.6 mm, 24.5 to 25.5 wt. aggregates 1.6 to 5.0 mm, 24.5 to 25.5 pens. Hiinitic cement with the consistency of this material after mixing with water for 19 to 21 sec., with an aqueous coefficient of 0.48 to 0.50. The consistency of the wet refractory mix is determined as the time it takes for the mix to flow out of the consistency sink during vibration and is determined according to the VLIHK NZ-72 6050-3-3 methodology. The aggregates and micro-fillers may be refractory materials such as fired flakes, fireclay, intentional corundum, mulit, and the like.

The solution allows the use of refractory material as a heater beam in electric hybrid stoves. The girder is a plate made of the refractory mass of dimensions 450 X 300 X X 33 mm, in which 12 pieces of 0 16/10 X X 300 mm pyrostatic tubes are built. Heating cantata spirals are inserted into the pyrostatic tubes during the installation of the stove.

The overburdened refractory blocks are produced according to the composition in% by weight: 25.0 pens. aluminous cement, 45.5% fired flake C 342 HR fraction 0.1 to 1.6 mm, 25.5% fired flake C 342 HR fraction 1.6 to 5.0 millimeters and fireclay fraction 0 to 0.1 millimeters 4.0%.

The blocks are manufactured by compacting the wet refractory mixture on a vibrating table into metal demountable molds. Before filling the mold with refractory concrete, the pyrostatic tubes are inserted and spatially stabilized in the mold. When the refractory concrete is compacted, the mold is released, leaving the tubes in the compacted block. After the hydraulic bonding, i.e. j. after 24 to 48 hours the fittings are dried and calcined to 450 ° C, with a min. 3 Hours. By preheating to this temperature, the amount of chemically bound water is reduced from 8.1 to 1.3% by weight. j. to the limit that can be used in a given thermal installation.

The test results of the new electric hybrid stoves confirmed the high technical level of the refractory concrete block used in the new way of fixing the heaters of the stoves.

The proven benefits of the solution are material assurance of mass production of a new generation of products, improvement of the functional and energy properties of the stove and substitution of the import of material from KŠ, used in the old way of fixing the heating elements.

Basic properties of the mass for combined block after annealing at 450 ° C:

The content of Al 2 O 3 38.9 wt.

Content of chemically bound water 1,26% wt.

Linear changes Bulk density Compressive strength

0.08 wt. 1.96 kg. m ^-3

13,0 MPa

Claims (2)

SUBJECT CLAIMS 1. A composition for the production of overlaminated refractory concrete blocks in combination with pyrostatic pipes, characterized in that it contains 3.9 to 4.1% by weight in the dry state. Microfillers with a fraction of up to 0.1 mm, 45 to 47 wt. aggregates with a fraction of 0.1 to INVENTION 1.6 mm, 24.5 to 25.5 wt. Aggregates with a fraction of 1.6 to 5.0 mm and 24.5 to 25.5 wt. Hiinite cement. 2. The mass according to claim 1, characterized in that the refractory aggregate is fireclay and fired flakes.