Ultrahigh-aluminium slag system for blast-furnace smelting

Abstract

The invention relates to an ultrahigh-aluminium slag system for blast-furnace smelting. The ultrahigh-aluminium slag system is prepared from the following components in percent by mass: 10-16% of MgO,18-30% of Al2O3, 1-5% of TiO2 and 0.7-1.15 of R2. When the content of Al2O3 in high aluminium slag of a blast furnace is 18-20%, the content of MgO is 10-12%, the content of TiO2 is 1-5%, and R2 is 1.05-1.10. When the content of Al2O3 in the high aluminium slag of the blast furnace is 20-23%, the content of MgO is 12-13%, the content of TiO2 is 2-5%, and R2 is 1.0-1.05. When the content of Al2O3in the high aluminium slag of the blast furnace is 23-25%, the content of MgO is 13-14.5%, the content of TiO2 is 3-5%, and R2 is 0.9-1.0. When the content of Al2O3 in the high aluminium slag of the blast furnace is 25-30%, the content of MgO is 14.5-16%, the content of TiO2 is 3-5%, and R2 is 0.8-0.9. The ultrahigh-aluminium slag system has the beneficial effects that the stability of the blast-furnace slag can be improved, and the defect of large fluctuation of the fluidity of the high-aluminium slag along with the temperature and the component is relieved; fluxing agents such as fluorite and manganese ore do not need to be added into blast-furnace materials, so that not only can the slag ratio be reduced and the air permeability of the blast furnace be further improved, but also erosionof the fluxing agents in the furnace slag to refractory materials in a hearth can be reduced.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to an ultra-high aluminum slag system used in blast furnace smelting. Background technique [0002] Affected by overcapacity and other conditions in the iron and steel industry, the current market performance is sluggish. Therefore, cost reduction has become the primary task for the survival of iron and steel plants. However, when a large amount of high alumina ore is used in the blast furnace, the viscosity of the slag will increase, the blast furnace slag and iron will be difficult to tap, and the fuel consumption will increase. Therefore, in order to utilize a large amount of high alumina ore and effectively reduce the cost of blast furnace production, high alumina ore is basically used in conjunction with a large amount of low alumina ore, and finally the Al in the blast furnace slag 2 o 3 The content is controlled below 16%. But this kind of dilution "Al in the slag ...

AI Technical Summary

Problems solved by technology

The disadvantages of the above-mentioned patents are that although the above-mentioned patents can reduce the viscosity of slag and improve the fluidity of slag, the B in iron ore 2 o 3 Not 100% into the slag, there is a part of B 2 o 3 It is reduced to B and enters the slag, which will affect the subsequent production of special steel

Images