CS250421B1 - Refractory chamotte material, especially for the production of soil blocks - Google Patents

Abstract

The solution relates to a refractory fireclay mass, in particular for the production of soil blocks for steel casting ladles, containing 30 to 80 parts by weight of ceramic grinding stone and 15 to 35 parts by weight of refractory clays. The essence of the solution is that it contains 5 to 20 parts by weight of kaolin slag and 0.1 to 1.25 parts by weight of oxidized syntan.

Description

FIELD OF THE INVENTION The present invention relates to refractory fireclay materials, in particular for the production of soil blocks for steel ladles comprising 30 to 80 wt. 15 to 35 wt. parts of refractory clays.

In steelworks, in addition to refractory materials, expressly sand, high-milled, bauxite, andalusite up to dolomite, pyrophyllite, magnesite, chrommagnezite, cyanide and zirconium for lining of steel casting ladles, refractory soil blocks up to 17 with a compression strength of up to 17 are still used MPa and water absorption 12 to 12.5%.

The refractory material from which the ladles of the steel ladles are lined is subject to enormous wear by the erosion of liquid metal incident upon tapping on the ladle soil and slag corrosion. The service life of ladle soils ranges from 9 to 10 castings, while the service life of ladle walls averages 18 castings. This considerable disproportion in the life of ladle walls and soils reduces the life of the ladles, the organization and economy of work, and the throughput of the foundry.

Extending the service life of the steel casting ladles, or achieving its compliance with the service life of the ladle walls, is solved by refractory refractory material containing 30 to 80 wt. 15 to 35 wt. parts of refractory clays according to the invention, which comprises 5 to 20 wt. and 0.1 to 1.25 wt. % of the oxidized · synthane. Kaolin slags and oxidized synthane act as a polyfunctional agent, forming a bond in the mass in which the melting of the components creates a glass phase in the surface layer giving the mass a significant compaction, which in the molten layer provides a barrier against the slag-forming oxides from the molten casts.

The advantage of the refractory refractory composition according to the invention is the increased plasticity, bondability and high green strength, with a reduced amount of mixing water, which greatly accelerates the drying cycle and reduces the energy demand for drying.

The advantage of soil blocks made of the refractory refractory mass according to the invention is higher durability, measured by the number of casts, compared to known soil blocks from conventional production due to the formation of water-insensitive bonds that resist high temperatures.

The refractory clay according to the invention is further illustrated by examples.

Example 1

In chamotte mass, with a composition of 40 wt. parts of flake as ceramic grog and 32 wt. parts of refractory clays, 8 wt. parts of kaolin sliver and 0.2 wt. % of oxidized synthane.

From this material were produced soil blocks ,, which have been fired in a tunnel kiln to a temperature of 1360 ^C, C. The soil was bricked blocks DNA steelmaking ladles. The results confirmed increased resistance to molten metal. 14 to 15 melts were cast from the pans.

Example 2

In the fireclay mass, the composition of 74 mass. parts of flake as ceramic grog and 16 wt. parts of refractory clays, 10 wt. and 0.13 wt. % of oxidized synthane. Soil blocks, fired to a temperature of 1420 ° C, were again made from this mass and were incorporated into the steel ladle with the result of 12 castings. The soil blocks of this example had a compressive strength of 58.8 MPa and a water absorption of 8.9%.

Example 3

Made of refractory clay, consisting of 3; parts of the shale as ceramic grit and 20 wt. parts of refractory clays with 10 wt. parts of kaolin and 0.5 wt. part of oxidized synthane, outflow blocks were created. After firing in a tunnel furnace at a temperature of 1340 ° C, the outflow blocks were built into the bottom of the steel ladles. 13 to 18 melts were cast from the pans.

Example 4

In chamotte, with a composition of 60 wt. parts of sand with an S1O2 content of 96.3 wt. as ceramic grit and 17 wt. parts of refractory clays, 8.5 wt. and 0.3 wt. % of oxidized synthane. The refractory clay was used as a mortar for lining steel casting ladles. In-service testing has shown that the mortar complies with the increased number of castings in steel ladles since there is no erosion of the liquid metal falling into the ladle soil when the joints between the bricks are filled with this mortar.

For the preparation of the products according to Examples 1 to 4, a kaolin sieve having an Al 2 O 3 content of 14% by weight, a SiO 2 silica content of 77% by weight was used. 158 and an oxidized synthane having a dry matter content of 90% by weight. in a concentration of 20% solution.

Claims (1)

SUBJECT Refractory clay, in particular for the production of soil blocks for steel casting ladles, containing 30 to 80 wt. 15 to 35 wt. BACKGROUND OF THE INVENTION Refractory clays comprising 5 to 20 wt. and 0.1 to 1.25 wt. % of oxidized synthane.