Hydraulically cured bulk of corundum composition

FIELD: metallurgy, in particular equipment for steel treatment in liquid state.

SUBSTANCE: hydraulically cured bulk contains (mass %): high aluminous cement 2.5-5; alumina 18-25; modifying additive 1.5-3; and balance: electrocorundum. As modifying additive preliminary synthesized material containing 45-55 % of Al2O3 and 42-52 % of CaO is used.

EFFECT: refractory material sintered at 16000C with decreased opened porosity and increased mechanical strength.

2 tbl

 

The invention relates to the production of refractories for thermal units in ferrous and nonferrous metallurgy, in particular to installations furnace steel processing.

In installations furnace steel processing unburned lining made of refractory mass is in contact with the molten metal and slag having a temperature of ~1600°C. Therefore, the resistance in the service of unburned lining will be determined by qualitative indicators, acquired during operation at a temperature of 1600°C.

The closest analogue adopted for the prototype, is hydraulically hardening mass containing as modifying additives ilmenite concentrate in the following ratio, wt.%:

high-alumina cement 13-20

ilmenite concentrate 0,7-3,0

the rest of electrocorundum

[Pat. 2098386, IPC 04 In 35/10].

Ilmenite concentrate has the following chemical composition, wt.%:

Tio260,8 FeO 29,0 SiO23,7, Al2About32,4 MgO 0,3, Cr2About31,5, MnO20,3, CaO 0,2, ΔmGOK=2,4.

The disadvantage of the prototype is a high open porosity and low mechanical strength.

Objective of the claimed technical solution is to reduce the open porosity and the increase in the compression strength after firing at 1600°refractories, manufacture of aliveyoga of hydraulically hardening mass corundum structure.

The problem is solved by using the pre-synthesized modifying additives containing 45-55% (wt.) Al2O3and 42-52% (wt.) CaO in the following ratio, wt.%:

high-alumina cement 2,5-5

alumina 18-25

modifying additive 1,5-3

oxide rest.

Example. For the manufacture of the samples used:

the oxide on THE 3988-064-00224450-94 (mass fraction, %: Al2About399,6, Fe2O30,04, SiO20,1, Na2O 0,2)

- alumina nametallurgicheskie according to GOST 30559-98 (mass fraction, %: Al2O399,5, Fe2O30,03, SiO20,1, Na2O+K2O 0,3, ΔmGOK=2,4)

- high-alumina cement in THE 5737-006-00284345-99 (mass fraction, %: Al2About375,6, CaO 23,1, Fe2O30,15, SiO20,6, Na2O+ K2O 0,14)

- modifying additive (mass fraction, %: Al2About349,8, CaO 49,2).

These materials were mixed in the ratios shown in table. 1, then the mixture was moistened with water in the amount of 8% (over 100% of the dry mixture) and stirred until homogeneous. The wetted mass was stuffed in a split metal molds. After 3 days of curing, the samples were dried at 110-120°s and annealed at 1600°aged for 4 hours After roasting determined their indicators, which are given in table 2.

Analysis of the data, given the data in table 2, shows that the use of pre-synthesized modifying additives in corundum hydraulically hardening mass can reduce the open porosity of the samples by 23.4% and increase their tensile strength when compressed by 25.5% compared to the prototype.

Hydraulically hardening mass of corundum composition comprising aluminium oxide, high-alumina cement, alumina and modifying additive, characterized in that as modifying additives it contains pre-synthesized material with a content of Al2About345-55% and Cao 42-52% in the following ratio, wt.%:

High-alumina cement 2,5-5

Alumina 18-25

Modifying additive 1,5-3

The Rest of electrocorundum



 

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