SU653236A1 - Charge for making refractories - Google Patents

Description

(54) CHARGES FOR THE MANUFACTURING OF FILES

are based on ceramic ceramic, refractory indexes, especially on wear resistance, vacuum resistance and strength characteristics at high temperatures. ,

The whole invention is to increase the vacuum stability, wear resistance, as well as the strength properties of refractories at high temperatures (mechanical strength, temperature of onset of deformation, creep).

This is achieved by the fact that the charge containing magnesito-chromite clinker and the temporary bond additionally contains fused aluminum-magnesia spinel in the following ratio of components, weight. %:

Magyesitochromite clinker of fraction 2-O mm15-77 Melted aluminum-magnesia spinel fraction 2-O mm 20-80 Binding additive 3.-5 Due to the diffusion interaction of grains of magnesite crystal clinker p. the fused aluminomagnesian spinel, the intergranular space in the semi-brilliant seal is crushed by the high magnetite with crystalline material, the secondary chipping phase of complex composition, which penetrates into the interlayer.

The presence of a secondary composition of the complex spinel phase in the inter-seam space, which plays the role of a highly refractory cement, causes the formation of vacuum-resistant, wear-resistant refractories, and also dramatically increases their strength properties at high temperatures.

Magnesite-chromite clinker is produced by roasting in a Rotary kiln a fine-milled mixture of 20-8 O% magnesite and 20-80% chromite ore. Fused alumo magnesia spinel is obtained by melting kaolin with additives of anthracite and iron shavings, followed by the introduction of magnesite into the melt in an amount that provides the content of 5 to 35 wt. % MgO in spinel (AB: T, p. No. 234200).

Products of the proposed mixture is obtained as follows. The initial components are mixed in the required amount, from the mixture obtained, the blanks are pressed at a specific pressure of

less than 1300 kg / cm, while the temporary binding is a solution of sulfite-alcohol bards with a density of at least 1.24 g / cm (or a solution of salt, for example magnesium sulfate, magnesium chloride with a density of at least 1.18 g / cm). Blanks are baked at a temperature of at least 1720С.

The invention is explained in the following examples. The composition of the mixture, weight. %:

I option II option

: Magnesite-chromite, clinker of fraction j 2mm

Fused alumina magnesian shpinel fraction: ё- 2 mm

Firing temperature

Physical-core indicators of the products obtained.

I option II option Porosity is open,% 14.5 13.8

Compressive strength, kg / cm

98О

1100

Temperature of onset of deformation under load of 2 kg / cm, С

1730 1760

Mechanical strength at 16OO ° C, kg / cm

thirty

33

Heat resistance (1300 water), number of heat changes

The introduction of fused aluminum magnesia spinel leads to an increase in the resistance of the refractory lining by 25% -30%.

Claims (1)

Invention Formula The mixture for the manufacture of refractories, containing magnetiochromite clinker and a temporary bond, characterized in that, in order to improve vacuum resistance, wear resistance and strength properties at high temperature, fused alumina magnesian spinel fraction was introduced into it with the following ratio of components, %: 5 Magnesite-chromite clinker of fraction 2 mm Melt apyumomagnezial spinel Temporary link 6532366 Information sources received during 15-77vvimivie during examination 2O-8O1. Copyright svtedepstvo USSR 3-5 № 380060, cl. From 04 to 35/20, 1973.