Furnace-protecting material for blast furnaces and preparation and application methods thereof

Abstract

The invention provides a furnace-protecting material for blast furnaces and preparation and application methods thereof. The furnace-protecting material for the blast furnaces comprises the following components: 30-39% of ilmenite concentrate, 5-8% of CDQ (Coke Dry Quenching), and 51-65% of pulverized coal. The preparation method of the furnace-protecting material for the blast furnaces is implemented through uniformly mixing the CDQ powder with the pulverized coal in proportion so as to obtain a mixture, heating the mixture, dehydrating the mixture, and grinding and separating the mixture; uniformly mixing the ilmenite concentrate with the mixture so as to obtain the furnace-protecting material for the blast furnaces. When the temperatures of bottom and basque detecting couples rise or the temperature difference of cooling water rises, the furnace-protecting material for blast furnaces is injected; the furnace-protecting material is injected after roughing slags in the process of tapping, and after normal coal blending is performed for 2 hours, the furnace-protecting material is injected again; oxygen-enriched injection is performed in the process of injecting the furnace-protecting material. According to the invention, the influence of the titanium content of scrap iron in the slags on the flowability of the scrap iron in the slags can be reduced, so that while the disposal capacity of metallurgical wastes is reduced, the furnace-protecting cost and coke rate of blast furnaces are lowered, the efficiency and effect of furnace protecting are improved, and the service cycle of a furnace hearth is relatively extended.

Description

technical field [0001] The invention belongs to the technical field of blast furnace hearth maintenance, and in particular relates to a furnace protection material for blast furnaces and methods for preparing and using the same. Background technique [0002] Modern large-scale blast furnaces require that the first-generation furnace has not undergone intermediate repairs for more than 15 years. Although blast furnace refractory materials, cooling equipment, and cooling media have made great progress, the blast furnace hearth and local lining of the furnace bottom often erode in the actual production process. Or damaged, seriously affecting the life of the blast furnace generation, only a few blast furnaces have reached the design target. The longevity of the blast furnace depends not only on the design and construction quality of the blast furnace hearth, but also is closely related to the daily operation of the blast furnace, especially the maintenance of the hearth. [00...

AI Technical Summary

Problems solved by technology

Although this method overcomes the shortcomings of mixed powder segregation and coal gun easy to block to a certain extent, there are still many problems unsolved in this method: (1) Since the method does not give the proportion of titanium concentrate powder used, if the proportion used is too high High, although it can play a role in protecting the furnace, it will inevitably bring a burden to the coal injection system, especially the spray gun, and even cause the spray gun to be blocked

(2) After the titanium concentrate powder ore used has been screened, part of the sieved material is not used directly, but is used as a sintering raw material, which will inevitably lead to high furnace protection costs

(3) As part of the sieve is used as sintering raw material, it has returned to the old way of adding titanium ore or titanium balls from the furnace top, which will inevitably lead to low furnace protection efficiency

(4) In this method, due to the addition of titanium-containing sinter from the top of the furnace, it is bound to cause TiO in the slag 2 Higher, which in turn affects the smooth slag discharge of the blast furnace