SU392029A1 - REFRACTORY CONCRETE - Google Patents

Description

,one

The invention relates to compositions of refractory concretes for the manufacture of monolithic linings of metallurgical neche.

Refractory mixtures are known, including coarse and fine aggregates and a mineral binder.

The purpose of the invention is to increase the refractoriness and mechanical strength of concrete.

The goal is achieved by using an annealed mixture containing MgO 60-70%, CrGO3-12%, ABO3 3-4% as a filler; SiOz 2-4%, CaO 1-2%, FeO + H-FeaOs 15-20%, and as a binder - magnesia cement with the addition of 3-5% fine mill scale; moreover, the concrete contains components in the following ratio in weight. %:

Filler fraction 10-50 mm 55-65

Filler fraction 1-10 mm 15-20

Magnesian cement with finely ground okalino.y20-25.

As a filler, it can be used as a specially prepared mixture of the proposed composition, as well as a waste chromo-magnesite brick saturated with iron oxides.

The proposed composition of concrete, by reducing the content of silicon oxide, and, consequently, the content of the heat-melting compounds that it forms, has a refractoriness in the range of 1650-1700 °. The use of bo spent chromo-magnesite and magnestochrome kirhEpcha with a high content of iron oxides and the addition of fine mill scale allows you to get in the process of service due to the formation of magnesioferrite dense sintering cutting with a strength of 500-600 kg / cm.

In the manufacture of concrete mix, the spent brick is supplied from the Marchiowski workshop on pallets without prior sorting. The brick is crushed on a jaw crusher with a magnetic separator to remove scrap. The crushed combat is dissipated in 10-50 fractions and

1 to 10 mm. Magnesia cement with additive

mill scale is ground in

.

Components are metered into

the following ration: the battle of waste brick fraction 50-10 mm - 60%, fraction -10 mm - 20%; binding - magnesia cement with the addition of 3-5% ground mill-scale - 20%. The resultant mixture is an ESI solution of MgSO4 with a density of 1.24 g / sg, the amount of which in the air supply of the desired consistency of the concrete mix can be 15-28% of the weight of the dry components. Concrete is poured into molds and compacted.

on the vibrating table. After the finished blocks

can be used for lining furnaces without subsequent roasting. The resistance of the refractory concrete blocks of the proposed composition is not less than 14–16 months, while the resistance of the blocks with chamotte aggregate on the phosphate bond is about 6 months.

Subject invention

Claims (2)

1. Refractory concrete for monolithic linings of metallurgical furnaces, including fine and coarse aggregates and a mineral binder, characterized in that, in order to increase the refractoriness and mechanical 3 & 2029 the strength of concrete, as a filler, use an annealed mixture containing MgO 60-70%, CrgOz 8-12%, ABO3 3-4%, SiOs 2-4%, CaO 1-2%, PeO + ResOz 15-20%, and as a binder - magnesia cement with the addition of 3-5% fine mill scale. 2. Refractory concrete according to claim 1, characterized in that it contains components in the following ratio by weight. %: Aggregate fraction 10-50 mm 55-65 Aggregate fraction 1-10 mm 15-20 Magnesium cement with fine mill scale 20-25.