SU749816A1 - Refractory mass - Google Patents

Description

(54) REFRACTORY MASS

The invention relates to the technology of obtaining durable and heat-resistant refractory products. A known composition for the manufacture of refractory products, including electrocorundum, refractory clay, zircon concentrate, a phosphate binder and a plasticizer, which has good heat resistance and plasticity during molding. Its significant disadvantage is the low strength of 5OO-7OO kg / cm and the large open porosity of 15.6% 1 j. Fireproof masses containing corundum, refractory clay, chromium oxide, zircon, and phosphate binder are known to have good heat resistance. The disadvantage of this mass is the large open porosity of 22-25% 2. The closest to the proposed refractory mass is the mass for the manufacture of refractory products, including molten mullite (base), Zircon Fine-ground 13.0-69.0 wt.%, hydrolyzed tetraethoxysilane (9, O13, 5 wt.%), aluminum and / or alumina (O, 7-3.8 wt.%) and methyl methyl silicate (O, O4-O, 135 wt.%) 3}. The refractory mass is prepared by mixing a hydrolyzed solution of tetraethoxysilane (4O% water; O, 8% hydrochloric acid, mp 1.19 g / cm and 6O% ethyl silicate - 32) with finely ground zircon fraction less than O, About mm, dispersed agaominium and (or ) with its oxide, then fused mullite treated with sodium methyl silicate is introduced into the mass. Samples are formed by vibration in collapsible forms, lubricated with grease. The disadvantages of products of this mass are the relatively low mechanical strength and strength after thermal cycling. The purpose of the invention is to increase the mechanical strength of heat resistance. This is achieved by the fact that the refractory mass for the manufacture of cast refractories, including mullite, zircon, iron-free, water, hydrochloric acid, additionally soderdt corundum in the following ratio of components, wt.%: Iron-free zircon 33.0-36.0 6.0-7 , 0 Saline acid 0.1-0.2 Electrocorundum 28.0-28.8 / Mullite Else In this case, electrocorundum, mullite and zircon con are distributed in fractions as follows, wt.%: Electrocorundum 1,1-0,4 mm 50-6O 0.16-0.10 mm 40-5O Mullite 3.2-1.5 mm 40-45 1.5-0.63 mm 28-5o 0.63-0.1 mm 28-ZO Zircon iron free less than 0.05 mm for example, were from samples and the proposed mass were prepared at the following ratio of components and a given grain composition, wt.%. Composition 1. Electrocorundum 1.1-0.4 mm16.5 O, 16-0.1 mm 11.5 Mullite5.2-1.5 mm14.1 1.5-0.63 mm9.4 0.63-0 , 1 mm9.4 Zircon iron-free

Properties

Porosity is open,%

Compressive strength of unfired samples, kg / cm

t. , 2

Compressive strength, kg / cm

Heat resistance (residual strength after 8 cycles of 2 ° C. The data in the table show that the products from the proposed mass are superior to products made from the material of the prototype in terms of mechanical strength and after thermal cycling.

The proposed refractory mass can be used in the manufacture of various refractory products that require heat resistance and mechanical strength, such as crucibles for melting meProtetotype

15.0

5.5

6.0

32

32 1440

29 2980 3330

tall steel cups for pouring steel, bed insulating plates.

Claims (3)

1. Refractory mass for the manufacture of cast refractories, including mullite, iron-free zircon, water, hydrochloric acid, characterized in that. Sol on acids Composition 2. 1.1-0.4 mm14.5 Electro-coruk 0.16-0.1 mm 14.3. Mullite3,2-1,5 mm11,5 1,5-О, 63 mm 8,4 0,63-О, 1 mm 8,1 Zircon iron-free36, 0 Water7, O Sol at acid0,2 Fire mass prepared by mechanical mixing of the zircon water slurry with the addition of hydrochloric acid with a mixture of grains (L1Thcd electrocorundum and mullite. Porous forms are filled with mass and vibrated for minutes at a vibration frequency of Hz and am- pill, O mm, 7 mm. After iO-30 min after vibro-processing of the product is removed from the molds, dried and fired at temperatures of 1480-1600 0. Before molding, the mass can be evacuated for 1-3 minutes with residual The pressure of 300-400 mm Hg The porosity of the burned mass is mainly represented by spherical Pores with a diameter O, 2-1.5 mm The table below shows comparative data on the properties of oxygen-resistant products made from the material of the prototype and products from the proposed mass. that, in order to improve mechanical strength and heat resistance, it additionally contains electrocorundum with the following cooTHoiueHHii of the indicated components, wt.%: Zircon iron removal33, 0-36.0 unworn Water 6, O-7, O Sol Na Acid Od-2 28.0-28.8 Electrocorundum Mullite Rest 2, Mass of pop, 1, characterized in that it contains electrocorundum, mullite and zircon of the following fractions, wt.%: 1D-0.4 mm 5O-VO Electrocorundum OD6-0.1 mm 40-50 3.2-1.5 mm Mullite, 63 mm 28-ZO O, 63-O, 1 mm Zircon iron-free less than 0, O5 mm 1OO Sources of information taken into account in the examination 1.Angorsky certificate of the USSR No. 457683, cl. From 04 to 35/10. 2. USSR author's certificate number 544639, cl. From 04 to 35/10. 3. USSR author's certificate number 478816, cl. From 04 to 35/10.