SU1384563A1 - Charge for making mouldable bacor refractory - Google Patents

Abstract

The invention relates to refractory industry and can be used to make a refractory material used for lining glass furnaces. The purpose of the invention is to reduce the duration of smelting and reduce production costs. The mixture for the manufacture of molten bakor refractories includes, in wt.%: Alumina 37-51; zircon concentrate 45-53; sodium carbonate 2–3 and a waste from chlorination of zircon — graphiticron cinder — 2–8. Moreover, graphite zirconium cinder contains, wt%: graphite 50-75; Zirconia 10-20; silicon dioxide 15-30. The refractories obtained from the mixture have corrosion resistance, determined in the molten sodium silicate glass in the dynamic mode at 1450 C, 27.2-28.7% by volume. The duration of electric melting 0.7-0.8 hours. 3 table. you are

Description

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The invention relates to refractory industry and can be used for the manufacture of refractory material used in dp lining glass furnaces.

The purpose of the invention is to reduce the duration of smelting and reduce production costs.

In the composition of the charge, a waste from chlorination of zircon is used: - graphite-zircon candle, containing, wt.%: Graphite 50-75; .ZrO ,, 20; SiO, 15-30. As impurities graphitocirconate. This calcine contains oxides of iron, aluminum, titanium, calcium, magnesium, and rare-earth metals.

For the preparation of the mixture using zircon concentrate, clay

earth, sodium carbonate, sodium nitrate, silica baddeleite, and graphite-zircon calcine of three compositions (see Table 1).

To prepare the mixture, the initial components are weighed and loaded into the mixer.

The mixing time of the components to obtain a mixture of the desired uniformity is 15 minutes. The prepared mixture weighing 60 kg is melted in a three-phase electric arc furnace with a voltage across the electrodes of 160–200 V and a current of 1.0–1.8 kA. The melt is poured into sand molds installed in a thermoelectric bed with diatomaceous earth. The duration of annealing of castings in a thermoelectric oven is 2-3 days. The main "operational indicator of refractory materials is corrosion resistance, determined in the molten sodium-calcium silicate glass in dynamic mode with rotation of samples of 11x11x80 mm in size for 24 hours at 1450 ° C. Corrosion resistance value

to reduce the volume of samples during the test (average of 6 samples),

The specific composition of the mixture are presented in table. 2, technical and economic indicators of electric smelting and corrosion resistance of refractories are in the table. 3..

Formula of invention

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A mixture for the manufacture of fused cast bakor refractories, including alumina, zircon concentrate and. sodium carbonate, characterized in that, in order to reduce the duration of smelting, and reduce production costs, it additionally contains a departure from the zircon chlorination - graphiticirconium calcine in the following ratio of components, wt.%:

Alumina37-51

Zirconium concentrate 45-53 Sodium carbonate 2-3 Waste from chlorination of zircon - graphitzirconium

table 2

46.0

46.8 1.5

28.7 27.9 28.1 28.5

0.8 0.7 0.7 0.7 0.8

92 91 92 93

0.7

5.0

Table 3

92

94

100

Claims (1)

The mixture for the manufacture of fused cast bacor refractory, including alumina, zircon concentrate 5 and. sodium carbonate, characterized in that, in order to reduce the melting time and reduce production costs, it additionally contains a departure from zirconium chlorination — graphitic zircon cinder in the following ratio of components, wtD: Alumina Zircon Concentrate Sodium Carbonate Waste from Zircon Chlorination Graphite Zircon