SU981294A1 - Refractory filling composition - Google Patents

Description

(54) REFRACTORY FILE

The invention relates to ferrous and nonferrous metallurgy, in particular to nabivN1 "4 refractory masses, used for lining thermal units with service temperatures up to, for example, steel-teeming ladles, natural gas overheating of the pig iron.

For lining steel casting ladles, use of silica masses with various additives.

A refractory padding mass of 1 is known, comprising as a base quartzite 7-10% by weight of liquid glass and 5.5-10% by weight of a chromium-containing additive. „

The disadvantages of this refractory mass of sloughs are low slag resistance at casting temperatures of steel, a high ability to impregnate with lashed donkeys, which reduces the refractoriness of the resulting material.

The closest technical solution to the proposed is refractory padding mass 2, including, wt.%: Quartz sand 70-82, graphite 10.2-2, ferrosilicon 2.0-4.8 bond 4-9.

a lining made of this mass has large carbon losses and low mechanical strength.

The aim of the invention is to reduce carbon losses and increase mechanical strength.

This goal is achieved by the fact that the refractory ramming mass, including quartz sand, ferrosilicon, carbon-containing components and binder, contains shungyt rock as the carbon-containing component, and liquid 15 glass as the carbon-containing component, May. %:

Sand sand 50-70

Ferrosilicon4-10

20

1 ungitova breed 20-40

Liquid glass3-7

Shungitovaya breed represents

a natural complex material, 25 containing amorphous carbon and silica in a finely dispersed state, the size of carbon particles does not exceed 0.03 µm, and that of silica is 15 µm. There are no volatile components in the shungite rock composition. For refractory compositions of masses, it is recommended to use shungite rocks, in which the ratio between carbon and silica is very close to the stoichiometry of the reaction of the formation of silicon carbide (i.e., 30-50% carbon-da), which is very useful for the lining service process casting ladle. When the carbon content in the unungite is less than 30%, its intense burnout occurs, accompanied by mass swelling. When the shungite rock contains more than 50% of carbon, a significant carbon burnout also occurs, and the sintering capacity of the ramming material deteriorates. Introduction to the composition of the mass of 20-40% of shungite rocks provides not only high slag resistance, but also the necessary strength of the lining at service temperatures. This is due to the unusually close contact of carbon and silica particles and their uniform distribution in 1 ugta. Reducing the content of schungite in the mass below 20% sharply worsens its resistance, increasing the content of shungite from 40% negatively affects the strength of the lining and its erosion resistance. The addition of 4-10% ferrosilicon, with a holding of 65-75% silicon, provides reliable protection of carbon against oxidation at service temperatures. The use of ferrosilicon containing less than 65% silicon for the protection of carbon leads to a significant increase in the ferrous compounds in the composition of the packing asy and reduces its wear resistance. With the addition of pure creme additives to the mass, the intensity of the carbidization process decreases. Introduction of less than 4% ferrosilicon to the composition of the mass practically does not intensify the process of carbylation in the absence of heat to reduce carbon losses. The addition of ferrosilicon / over 10% contributes to the reduction of slag-tight lining due to the formation of low-melting compounds.

Prototype

1 Quartz sand 80

Graphite20

oh oh

over 100%

33.5 The process of carbide formation proceeds throughout the entire volume of the samples, apparently due to the intensive formation of gaseous silicon monoxide in the service process. Units of low-temperature modification of silicon carbide by petrographic studies were found not only around ferrosilicates, but also on the surface of shungite particles. The reduction of silica in shungite is quite intensive, which is determined by the fine-grained structure of the rock. The finely dispersed structure of the scrub rocks also contributes to the intensive sintering of the lining and increase its erosion resistance. The refractory padding is prepared as follows. Raw materials before serving in the runners are crushed and crushed. The grain composition of schungite rock should not exceed a fraction of 0.1 mm. Increasing the size of the 11ungite grind changes the paBHOMei Hoe its distribution in the refractory mass, which leads to the local lining of the Hctey. Ferrosilicon is crushed to complete passage through a sieve of 10,000 holes / cm, which contributes to the intensification of carbidization processes. The prepared materials are fed into the runners bowl in the following sequence: quartz molding sand, schungite rock and ferrosilicon. Grinding and mixing of the components of the mass in runners is carried out for 15-20 minutes. Moisture the mass with liquid glass with a density of 1Д5-1,20 5-7 minutes before the end of grinding. The properties and properties of the stuffed masses are given in the table. Molding sand can be used as a quartz filler. As can be seen from the table, the proposed mass in comparison with the prototype mass in terms of increasing the mechanical strength and reducing carbon losses has advantages, which increases the operational durability of the lining and reduces the cost of mass.,;

Claims (1)

Claim A refractory packing material, including quartz sand, ferrosilicon, a carbon-containing component and a binder, characterized in that, in order to reduce carbon loss and increase mechanical strength, it contains shungite rock as a carbon-containing component, and liquid glass in the following ratio as a binder , components, wt.%: Quartz sand Ferrosilicon Shungite rock Liquid glass