SU885219A1 - Charge for making refractory materials - Google Patents

Description

The invention relates to ferrous metallurgy, in particular, to the production of unburned refractory plates of slide gates for casting steel from a ladle. Blends are known for the production of unburned refractories, where magnesite or rapic magnesium oxide is used in a mixture with Campersay chromite or electrofusion spinel on a chemical bond of magnesium sulphate and boric acid. The strength in this case is increased up to 1000 kg / cm with the use of different magnesia with Kempirsai Mitom on a bond of 3% magnesium sulphate and 2% boric acid C1. Closest to the present invention is a mixture containing sintered magnesite, fractions of 4 to 3 mm chromite, fire resistant clay, water glass and methyl cellulose. In this mixture of chromite, a highly refractory magnifier, magnesite, is a highly refractory material that promotes hardening. It gives strength to pressurized product. LCD glass is a chemical bond that gives strength to the product in services at high temperatures (over 600 ° C). Refractory clay is a plasticizer that increases the strength of the raw material after pressing G2. A disadvantage of the known charge is that chromite increases the swelling of refractory products when exposed to iron oxides in service, leading to their destruction and reduces the metal and slag resistance of products from such charges. Methyl cellulose - methyl cellulose ether C (, H 70, OHJj-x (OCH)) is used for gluing refractory at heat treatment temperature, but it does not provide sufficiently high strength of products and, moreover, at temperatures above 300 ° C, it leads to a decrease in strength It is not possible to use this material as the basis of plates for unbroken casting of steel, since the heating of the plates takes place stepwise and in the interval from 300 to the loss of their strength takes place, which leads to their destruction and the passage of metal between the plates. elichenie mechanical strength.

The goal is achieved by the fact that 1GO lunxTa, including magnesite of a fraction of 3 mm, liquid glass and refractory clay, additionally contains magnesium sulfate at the following ratio of components, wt%:

Liquid glass2-7

Refractory Clay2-4

Magnesium sulfate 0.05-0.3

Magnesite fraction

 3 mmOther

Example. For the preparation of the samples, the masses of the three compositions are prepared from the mixture, a mass of 4 is also prepared, and the samples of the known mixture are prepared, shown in Table 1.

Claims (2)

Claim A mixture for the manufacture of refractories, including magnesite fractions of 3 mm, water glass and refractory clay, characterized in that, in order to increase mechanical strength, it further comprises Composition Compression limit. strength at at ⁰ C, kgf / cm ¹ } - 20 ] 300 | 600 1 750 700 850 2 950 800 930 3 850 750 875 Famous 175 83 150 The tests are carried out according to a single method and on the same number of samples. From the table. 2 shows that the samples from the proposed blends according to the limit of other 50 magnesium sulphate when suturing components, Liquid glass Refractory, clay Magnesium sulfate Magnesite fraction ί 3 mm of the following ratio.%: 2-7 2-4 0, p5-t), 3 Rest Sources of information taken into account during the examination 1. Antonov G.I. and others. Non-fired magnesia products on a chemical bond for arches of open-hearth furnaces. - Refractories, 1972, 60 * 8, p. 9-17. 2. USSR author's certificate No. 392045, cl. S 04 V 35/04, 07/27/73 VIIPI Order 10441/31 Circulation 663 Subscription Branch of PPP Patent, Uzhhorod, st. Project, 4