SU833867A1 - Mass for resin-binded articles - Google Patents

Description

(54) MASS FOR ASSOCIATED PRODUCTS

one

The invention relates to metallurgy, in particular to the manufacture of smolodolitovykh, smolomagnitododomitovyh, pekodolomitovyh refractory materials, such as for example, for lining oxygen converters.

There are refractory products on the resin bond l of the following composition, wt.%:

Dolomite fraction 5-00 mm, obtained by crushing dolomite fraction 15-8 mm 30.0 Dolomite fraction 5-00 mm, obtained by crushing dolomite fraction 8-2 mm 30.0 Fine magnesite powder 40.0

Disseminated coal tar (in excess of 100 wt.% Dry powders) 5-6 Also known composition of smolodolomnogozitovogo refractory ij, consisting, wt.%:

Dolomit6 5

Magnesite powder 35 Dissected ka. mennagol resin 7,6

However, products of known composites have a short shelf life from the moment of manufacture to ignition (5-8 days), and the penetration of oxides into the thickness of the lining contributes to more intense peeling and chipping, and its rapid wear. At the same time, the possibility of carburizing refractory products is limited due to

0 resin bond due to the fact that its amount in the mixture is limited by the conditions of pressing refractories.

Moreover, the magnesite powder in the composition of the Kremlin is expensive.

5 and scarce material.

Closest to the proposed mass is the mixture for the manufacture of refractory products 3, including, wt.%:

0

35-45

Dolomite

25-45

Magnesite Powder

Coarse MAG17-20 nezit

Stone coal on

five

4-8

resin 4-12

Pitch coke

For the prototype, the disadvantages indicated above are characteristic.

Increase Residual Carbon

In tar refractories, refined carbon can be achieved by introducing solid carbonaceous substances such as graphite, blast furnace coke, coke, carbon black, pitch, etc. in the binder or in the charge during the pressing process. The purpose of the invention is to increase the service life of refractory products, namely, the storage time from the moment of pressing to the lining, increasing the durability of the lining, reducing the cost of finished products, saving scarce materials. The goal is achieved by the fact that the charge, consisting of a fraction of that and magnesite powder of coal tar and a carbon additive, is introduced as the last high-temperature pitch in the hotdome state by joint grinding with magnetite in the following ratio of ingredients, wt.%: Dolomite30-65 Coal-prepared tar 5-10 High-temperature coal tar pitch. 3-15 Magnesite Powder Remaining Kame nnu nolny to the highest temperature peck is a source of coke formation in the finished products. Tests and petrographic studies of finished pressed refractories show that the addition of high-temperature coal tar pitch allows you to evenly distribute the carbon-containing substance in the refractory, increase the shelf life of finished products, improve physical and chemical indicators. With the warm-up and service proposed 5732,992.91 490 2.99 2.8 5093,12.89 397 3.02 2.93 6373,112.95 5213,053.3 4932,992.97

(known-368

2.78 3.08 387 2.93 3.20 ny)

table 2

389

Claims (3)

2.95 2.3 composition of the melting of the pitch, its sintering and coking allows you to create a uniform mololnuyu mixture. In service, refractory products of new composition have increased durability, there is no leaching of individual grains with a slag-metal melt of converter melting during its purging with oxygen. The kneading of the mass is carried out according to the accepted and known technology. The total mixing cycle is 20 minutes. The pressing was carried out with an effort not exceeding 1280-1300 kg / cm. In tab. 1 presents the resulting compositions in table. 2 - their properties. Table 1 45 55 42 65 30 60 Dolomite Coal-prepared resin 610 8 5 10 8 Magnesite powder 46 25 35 22 45 26 Coal high-temperature pitch (temperature 220-24 ° C) 3 10 15 8 15 6 2,97 2,6 2, 8 83 These results were obtained on existing converters. The results of testing the optimal composition (3) under industrial conditions give an increase in the lining resistance up to 50%, while the storage period exceeds 30 days. Claim Mass for gummed products containing dolomite, magnesite, coal tar and carbonaceous additive, characterized in that, in order to increase the shelf life and longevity, it contains as carbon-containing additive coal high-temperature pitch with the following ratios of components, wt.%: 76 Dolomite 30-65 Coal-tar prepared resin 5-10 Coal high-temperature pitch 3-15 Magnesite powder Else Sources of information taken into account during ex ertize 1, Technological Instructions manufacturing bezobzhigovyh proportion datomagnezitovyh the converter refractories resin bonded, IST-1-75, Zhdanov, p. 8-10. 2. Kaynarsky I.S. Basic refractories. M., Metallurgists, 1977. 3. USSR author's certificate No. 618359, cl. From 04 to 35/56, 1977.