SU878752A1 - Charge for making refractory materials - Google Patents

Description

The invention relates to refractory industry, namely to high-grade refractories used in high-temperature aggregates of the metallurgical and machine-building industry: in electric arc-fired open-hearth furnaces. The known charge for the manufacture of high-alumina refractories, including, wt.%: Myllite-corundum fireclay (with a content of 80-95%; Corundum clay; Corundum; is a charge for the manufacture of fire stops, including, wt.%: Mullite-corundum Corundum Clay refractory or kaolin Mullite fused D However, products from such a mixture do not have sufficiently high slag-resistance, The purpose of the invention is to increase the slag resistance. The achievement is achieved by the fact that the charge for the manufacture of lining, including mullite-corundum chamotte, corundum, refractory clay or kaolin and fused mullite, also contains the ratio of components, wt.%: Mullito-corundum Corundum Clay refractory or kaolin Mullite fused Chromium oxide Products of the proposed mixture are prepared by conventional semi-dry molding technology at a specific pressure of drying 500 kg / cm -, dried and calcined at 1550-1600 s. The following are specific formulations of known and proposed blends for the preparation of refractories, wt.%:

ProtoComponents Type

Mullito Corundum40

Common fireclay 40 Corundum 30.8 29.2 27.7 9.2 8.8 8.3 Clay Mullite floating 20 20 lame Chromium oxide The table shows the mechanical properties of products made of limestone and the proposed charge.20 As the table shows , temperature

40

20

40

50 2.0 4.0 24.6 30.8 19.5 7.4 9.2 7.5 20 35 20 8.0 5.0 3.0 onset of deformation under load and the resistance to slag of refractories with the addition of chromium oxide exceed those the same value of samples of refractories from the known charge.

Temperature of onset of deformation under load of 5 kg / cm, from 1550 1570 1560 Shlakorazeda5, 40 4.07 3.50 A, cm 1560 1580 1570 3.00 3.41 3.91

Claims (2)

Claim The mixture for the manufacture of refractories, including mullite-corundum fireclay, corundum, refractory clay or kaolin and fused mullite, characterized in that, in order to increase slag resistance, it additionally contains chromium oxide in the following ratio of components, wt.%: Mullite-corundum fireclay20-50 Corundum19-31 45 Refractory clay or kaolin 7-12 Mullite, processed. 20-35 Chromium Oxide 2-8 50 Sources of information taken into account in the examination 1. US patent No. 3135616, CL. 106-65, 1961. 2. USSR copyright certificate 55 No. 628135, cl. C 04 V 35/10, 1977 (prototype).