SU563400A1 - Charge for fabricating the refractory material - Google Patents

Description

one

The invention relates to the manufacture of refractory materials.

The known closest to the invention in terms of the technical solution is the charge for the manufacture of refractory materials, including, for example, 87% of magnesite and 13% of the additive, aluminum hydroxide 1.

The disadvantage of materials made from this mixture is relatively low density, strength and heat resistance.

The purpose of the invention is the improvement of strength, tightness and heat resistance.

This is achieved due to the fact that the mixture for the manufacture of refractory material, including 85-90% magnesite powder and 10-15% additive, contains as the last a mixture of finely dispersed aluminum, aluminum oxide and aluminum hydroxide at the following ratio of components, weight. %: Fine aluminum 45-50

Aluminum oxide 25-30

Aluminum hydroxide 25-30

At the same time, slag from the production of aluminum alloys can be used as an additive.

For the manufacture of refractory material, slags washed with soluble salts of dispersion of O-1.2 mm are used, having the following approximate chemical composition, weight. %:

A1

49-51.0

АООз 19-22 А1 (ОН) s 20-23 The rest of ppt Slag dried. grind to the value

grains 5–10 µm, mixed with 87% sintered magnesite powder, a solution of sulphite-alcohol bards (the moisture content of the mixture should not exceed 4%) is added, mixed and molded blanks at a specific pressure of at least 1000 kg / cm

Firing products is carried out in an oxidizing environment at a temperature of 1600-1650 ° C.

The presence of negligible amounts of slagstone and potassium chloride in sodium slag reduces the sintering temperature of the refractory, while in the firing process they decompose and evaporate.

The material obtained from the mixture of the indicated composition is characterized by the following properties:

Porosity is open,% 7.5-9.8

Volumetric weight, 18-3,22

Strength at compression, KG / CM2950-1000

Temperature of onset of deformation under load 2 KG / CM2, ° С 1740-1800

Claims (1)

Heat resistance (1300 ° C-water), heat change8-9 Heat resistance (1300 ° C-WoP-spirit), heat change 115-120 The invention The mixture for the manufacture of refractory material, comprising 85-90% magnesite powder and 10-15% additive, characterized the fact that, in order to increase strength, density and heat resistance, it contains as an additive a mixture of fine aluminum, aluminum oxide and aluminum hydroxide in the following ratio of components, weight. %: Fine aluminum 45-50 Aluminum oxide 25-30 Aluminum hydroxide 25-30 Sources of information taken into account during the examination 1. Japan patent 4537026, cl. 20 A25, 1970.