SU1248995A1 - Charge for producing refractory articles - Google Patents

Description

The invention relates to the technology for the manufacture of periclazohyl-1 refractories based on fused materials, designed for the futures of chambers for batch evacuation of steel and metallurgical aggregates operating in a high temperature mode with an aggressive environment.

The purpose of the invention is the transformation of the resistance of refractories,

Oxide dirconium-containing material, introduced into the composition of the bonding mixture, prevents the inversion of Ji- 2 CaO SiOj in refractories, is made of the proposed mixture, and, therefore, prevents the formation of dust-like products of destruction, as a result of which wear resistance of refractories.

The introduction of the zirconium-containing component into the composition of the connecting PP-1hta allows one to evenly distribute the stabilizer of two-fold silicate in the channel pores and capillaries and to prevent the inversion 2 of CaO-SiOj in the overall batch volume.

For the preparation of the charge, granulated periclazochromite is used; : granular material containing chromium oxide in the range of 25, 0-75.0% and a binder, including oxide dirconium, a compound material (baddeleite or depressed baddeleite, stabilized with calcium oxide) and a mixed component containing the component (cyclic oxide component (cyclic oxide component) (cyclic oxide component stabilized with oxides) and a permeable component (cyclic oxide component stabilized with caldi oxide) 1), Composition of granular material, May.%. Zernisty fused periclazochromite 40-70 granular material,

containing chromium oxide in the range of 25-75%. 5-25

Binder 20-40

The preparation of the charge is carried out according to the conventional technology, which does not require additional costs and equipment.

First, granular powders are loaded into the mixer, which are mixed, washed down with a temporary binder, mixed again, then the binder is added to the milled component. After mixing, the mass is fed to the molding products,

The associated component of the proposed blend is prepared by coBMecTHMvf by grinding fused periclase-containing com

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ponenta (fused periclase, fused periclazochromite, fused chromium-thermal periclase) with an oxide and rhonium-containing component (baddeleite, melted 5 baddeleite, stabilized by calcium oxide)

To determine the open porosity in vacuum, products are pressed in the form of cylinders with a diameter and height of 36 mm, to determine the temperature of the onset of deformation — with a diameter of 36 mm and a height of 52 mm, for determination of slag resistance — crucibles with an internal diameter of 16 mm and a wall thickness of 10 mm.

Refractory products are fired in a tunnel kiln at 1840 C.

Prepare the mixture following

compositions, wt.%:

Granular fused periclazochromite Nucleus material containing chromium oxide 55% (MgO 30%, AljOj 8.0% Re. Oz 5.0%) Binder (fused periclase 98.2%, baddeleyite 1.2%)

Granular fused periclazochromite Granular material containing chromium oxide 75% (MgO 24.0%),

Binder (fused periclazochromite 96.0%, fused stabilized bad baddelyite 4.0%) Fuzzy fused periclazochromite Granular material, containing 1st chrome oxide 25% (MgO 52%, AljO ,, 18%, 3%)

Binder (fused chromitoplacer. 90%, baddeleyite 10%)

The open porosity, apparent density, compressive strength, and the temperature of the onset of deformation under a load of 0.2 Sha are determined by standard methods.

The thermal stability is determined by heating the products to 900 ° C, stripping at this temperature for 15 minutes and cooling in running water until the samples are destroyed.

The evaporation rate of o1 neuros is limited by reducing the mass of the samples for 1 hour at 1650 ° C and a residual pressure of 0.6 KPa.

Slag resistance is determined by filling in the refractory crucibles of the donkey (SiO 14.60%; Foou 32.50%; 5.10%, MpO A, 40%, CaO 32.20%, MgO 11.10%, PjOj 1.13 %) and firing in a tunnel kiln at 1640 C. The depth of impregnation and separation is determined on the mounting plate under a microscope in reflected light.

Opened porosity,% 10.8 12.1 11.2

3.28 3.26 3.27

Seeming density, g / cm

Strength at

compression, MPa 68.9 73.4 70.8

Heat resistance (900 C - water), heat shifts 26

Temperature of onset of deformation under load 2 ffla, C

Additional shrinkage,

(1650 ° С, shutter speed 3 h),%

Evaporation (loss

masses, (, 0.6 kPa,

1 h), wt.%:

impregnation depth, mm Slag resistance

depth of corrosion, mm

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The physicomechanical properties of the matched charges are given in Table. one.

The samples are placed in alundum glasses and covered with slag. The durability is determined by appearance and the petrographic method of analysis (Table 2).

10 Products made of the pre-. blends, have high physicomechanical properties and have a wear-resistant structure.

Spreadsheets

10.8 12.1 11.2

3.28 3.26 3.27

68.9 73.4 70.8

26

24 29

1750 1750 1750

0.2 0.2 0.2

5.6 6.3 5.8

1.40 1.45 1.51

0.15 0.17 0.16

14.4 3.26 58.4 28

1620 1.2

7.4 1.62

0.22

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. Table 2

Charge

Wear resistance of refractories

The proposed items are dense, dust- - 2С О О ,,, N 1,732; left-wing products from Np 1.74

1 were absent; SCaOMgO 2Si.02 N-1.7286 pa wear-resistant refractories; N 1.710 CaOZrO N 2.09 stable

2 Same

Known Product surface y-2CaO SiO, N 1,654; ryosha, under peeling off- Np 1,642

The reaction reaction cossay is CaOMgO-SiOj, the layer N, 1.653; TOL1TSINA powder 1.0 - N 1.639 1.5 mm. The structure of refractories to silicate decomposition is not wear-resistant

Phase composition of strongcat

Claims (1)

MIXTURE FOR THE PRODUCTION OF REFRACTORY PRODUCTS, including granular fused periclase chromite, a granular material containing chromium oxide and a binder based on a finely ground fused periclase-containing component, characterized in that, in order to increase wear resistance, the binder additionally contains an oxide content of 1.2-10 zirconium , 0% of the periclase-containing component of the binder, and the granular material contains chromium oxide in the range of 25-75% in the following ratio of the charge, wt.%: Granular fused periclase-chromite Granular material containing chromium oxide component 40-70 within 25-75% Specified Binder 5-25 20-40 β SU ,,,, 1248995