SU814972A1 - Refractory mass - Google Patents

Description

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The invention relates to refractory industry and can be used in the manufacture of basic refractory products used for lining thermal units.

A refractory mass is known for basic refractory products, including sintered magnesite and natural chromite in a granular and finely ground form l.

The disadvantage of the known mass is that with high heat resistance of products made from it, they are characterized by insufficient high temperature strength and slag resistance, which is explained by the insufficient degree of completion of the processes of interaction between the components of the ground component.

The closest to the present invention is a refractory mass of 2, including: sintered magnesite 40-50, chromite 10-20, fine grind 30-40., Binder 3-7. The fine grind contains, in wt.%: Magnesite 7.0 -6-0, chromite 10-20, bauxite slurry 15-25.

The disadvantage of the mass is the low strength made from it

products at high temperatures due to the formation of a large amount of liquid phase in the refractory and intensive mass exchange of refractories with reagents in the furnace’s melting space through the liquid phase.

The purpose of the invention is to increase the high temperature strength and slag resistance of refractories.

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This goal is achieved using as a ground component of fused periclazochromite in the following ratio of components, wt.%:

five

Granular Sintered

magnesite40-75

Zernist chromite

ore 5-20

Fused periclase0

dispersed chromite

(with content

8-18%) .. 20-40

Fused periklazokhromit get electric arc melting unit

5 of a mixture of chromite ore and a product containing magnesium oxide (magnesite, brucite, sintered magnesite).

A periclase chromium is a solid solution of magnesium chromite in periclase, which is characterized by

A HIGH degree of completeness of the reactions between the components that are supplied to the smelting, besides, a perfect crystalline structure and; low content of low-melting impurities. All this determines the chemical, inertness of periclazochromite and high modulus of elasticity in a wide range of temperatures, and high modulus of elasticity makes it possible to obtain, by grinding, highly dispersed, active to sintering. The material. Using it as a fine-milled component of the refractory mixture in the firing process results in a uniform, dense structure of refractory, characterized by high slag resistance and strength in service conditions in metallurgical furnaces.

For the manufacture of products using periclazochromite of the following chemical composition, wt.%: Sii.O / j 1.52, 0; AP-aO3 2-3,0; 8-18; CaO less than 1.5; MDO 68-80; Rea.Oe4-7.

Products are prepared as follows.

A mixture of the proposed components of a specific grain composition with sulphite-yeast sconce is prepared: as a temporary binder and pressed into an hydraulic press at a pressure of 1500 kgf / cm, dried and burned in a tunnel kiln for 4 hours;

Table 1 shows the composition of the mixture, Table 2 shows the properties of samples of three compositions.

Table 1

Samples made from the proposed mass have elevated slag resistance and high temperature strength.

Claims (1)

1. Golovko Zh, A. and others. Manufactured. . of the experimental batch of dense vault Copyright Certificate of the USSR magnesite-chromite refractories. - as per vek No. 2691838, cl. C 04 C 35/04 Collection of specials1978.