RU2301213C1 - Refractory mixture for filling the outlet port of steel teeming ladle - Google Patents

Abstract

FIELD: refractory materials used in metallurgy; refractory mixture for filling the outlet port of steel teeming ladle.

SUBSTANCE: proposed refractory mixture contains silica filler, graphite and additionally carboxymethyl cellulose at the following ratio of components, mass-%: graphite, 5-6; carboxymethyl cellulose, 0.09-0.15;the remainder being silica filler.

EFFECT: constant volume of refractory mixture; smooth graphite envelope on refractory filler grains.

2 ex

Description

The invention relates to refractory materials used in metallurgy, in particular, as a refractory mixture for filling the outlet channel of a steel pouring ladle.

Known refractory mixtures used to fill the outlet channel of a steel pouring ladle, containing refractory aggregate and graphite, for example, inventions according to RF patents No. 2242441 С04В 35/00, С04В 35/14, B22D 41/16, 2004 [1]; No. 2228819 B22D 41/46, 2004 [2]; No. 2239521 B22D 41/46, 2004 [3]; published applications No. 2000116970 B22D 41/16, 2002 [4]; No. 2002115600 C04B 35/14, B22D 41/16, 2003 [5].

According to the combination of common essential features closest to the patentable one, the refractory mixture according to the RF patent No. 2228819 В22D 41/46, 2004 [2], containing a siliceous aggregate - vein quartz and an anti-sintering component - graphite, can be attributed.

The disadvantage of this refractory mixture is the significant linear expansion of quartz grains during phase transformations during heating and the likelihood of the refractory mixture freezing in the outlet channel (the phenomenon of sulphation), as well as the uneven coating of grains with graphite due to the high content of lamellar grains in quartz. and needle-shaped.

The objective of the present invention is to remedy these disadvantages and increase the reliability of the opening of the exhaust channel.

The technical result consists in increasing the volume constancy of the refractory mixture, creating a uniform graphite shell on the grains of the refractory aggregate.

To achieve this, according to the claims, the refractory mixture for filling the outlet channel of a steel pouring ladle as a siliceous aggregate contains crushed bout and / or scrap of dinas refractories and additionally carboxymethyl cellulose, in the following ratio, wt.%: Graphite 5-6, carboxymethyl cellulose 0, 09-0.15, crushed battle and / or scrap of dinas refractories the rest.

The essence of the invention lies in the fact that the siliceous aggregate from ground battle and / or scrap of dinas refractories has a significantly lower linear expansion than vein quartz, since phase transformations in it have already occurred during heat treatment in the manufacturing and service processes, this eliminates the possibility of it hanging in exhaust channel. Due to the adhesive properties, carboxymethyl cellulose well retains graphite on the grains of said aggregate, creating an anti-sintering layer.

The content of carboxymethyl cellulose in the refractory mixture of less than 0.09 wt.% Is not enough to bind the entire amount of graphite and create a uniform carbon shell on the grains of the refractory aggregate, and its introduction of more than 0.15 wt.% Leads to a deterioration in the fluidity of the mixture.

To obtain a refractory mixture of the claimed composition, the following materials were used: crushed scrap and fight of dinas products without slagging and foreign inclusions with a content of SiO ₂ , wt.%, At least 94 fractions of 1-3 mm, carboxymethyl cellulose (TU 6-01-20-44- 90), graphite grade GE-1 (GOST 7478-75). These components were dosed in the amounts given in the claims and mixed in the mixer in the following order: first, a refractory aggregate and a pre-prepared carboxymethyl cellulose solution (CMC / water ratio 1:17), then graphite was fed into the mixer and the components were mixed for 2-3 minutes. The moisture content in the finished refractory mixture is not more than 2 wt.%.

Specific examples and properties of the mixture:

Composition 1, wt.%: Fight dinas products FR. 1-3 mm - 94, graphite GE-1 - 6, a solution of carboxymethyl cellulose - 2.5 (0.12 dry over 100).

Composition 2, wt.%: Fight dinas products FR. 1-3 mm - 70, scrap of dinas products fr. 1-3 mm, - 25, graphite GE-1 - 5, a solution of carboxymethyl cellulose - 2 (0.1 on dry over 100).

The resulting refractory mixture was used to fill the outlet channel of the steel pouring ladle in preparation for receiving metal. The tests were carried out in steel-pouring ladles of the Guryev Metallurgical Plant.

When the slide gate was opened, the refractory mixture of the proposed compositions freely poured out, which indicates the absence of sintering and freezing.

Thus, a new refractory mixture was created for filling the steel outlet of the steel pouring ladle, which provides stable opening of the channel without burning with oxygen.

Information sources

1. RF patent 2242441, С04В 35/00, В22D 41/16, 2004 [1].

2. RF patent 2228819, B22D 41/46, 2004 [2].

3. RF patent 2239521, B22D 41/46, 2004 [3].

4. Publ. RF application 2000116970, B22D 41/16, 2002 [4].

5. Publ. RF application No. 2002115600, С04В 35/14, В22D 41/16, 2003 [5].

Claims (1)

A refractory mixture for filling the outlet channel of a steel pouring ladle containing a siliceous aggregate and graphite, characterized in that it contains crushed battle and / or scrap of dinas refractories as a siliceous aggregate and additionally carboxymethyl cellulose, in the following ratio, wt.%: Graphite 5-6 Carboxymethyl cellulose 0.09-0.15 Ground battle and / or scrap dinas refractories Rest