A protection method for the inner lining of the Hismelt process smelting reduction furnace

A reduction furnace and furnace lining technology, applied in the protection field of HIsmelt process smelting reduction furnace lining, can solve the problems of large consumption, short service life, expensive refractory materials, etc., to reduce erosion and erosion, reduce production costs, The effect of improving the service life

Active Publication Date: 2018-05-08
BEIJING SHOUGANG INT ENG TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a protection method for the smelting reduction furnace lining of the HIsmelt process, which solves the problems of expensive replacement of SRV lining refractories, large consumption and short service life

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  • A protection method for the inner lining of the Hismelt process smelting reduction furnace

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[0021] Add the slagging agent of titanium-containing material into the solid material spray gun equipment 1, and use N 2 Injected into the SRV furnace with a blowing flow rate of 75t / h, the TiO in the titanium-containing material 2 Under the high-temperature reducing atmosphere in the SRV furnace, it melts in the high-temperature slag-iron, and forms a mixture phase of TiC, TiN and solid solution Ti(C,N) and slag in the slag-iron in the slag-iron interface 6 and above. , TiC and TiN have very high melting points, pure TiC is 3150°C, and TiN is 2950°C. No matter in the slag phase or in the molten iron phase, Ti(C,N) exists as tiny solid particles, making the liquid phase Viscosity increased significantly, and the high-viscosity mixture phase was sprayed by hot air spray gun 7 and high-speed N 2 The formed airflow splashes onto the lining surface of the SRV furnace, and the total time for the solid material containing slagging agent to be sprayed into the SRV furnace is 100 min...

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Abstract

The protection method of the lining of the HIsmelt process smelting reduction furnace belongs to the technical field of non-blast furnace ironmaking. The titanium material slagging agent is blown into the SRV furnace with N2, and a high viscosity mixture is formed in the slag iron and splashed onto the surface of the furnace lining to increase the amount of cooling water in the slag area, so that the high viscosity mixture phase is attached to the surface of the protective brick to form the protective slag layer of the lining, thus forming an integral protective layer for the key parts of the SRV furnace lining; the agent is added to the stemming of the slag mouth. When the opening machine reduces the depth of drilling to the original depth of 70% to 80%, the special stemming is replaced, and pressed into the SRV furnace. The special stemming contacts with high temperature slag to form the high viscosity mixture phase in the inner wall of the lining of the slag mouth, to form local protection. The protection method of the lining of the HIsmelt process smelting reduction furnace is characterized in that the service life of the lining of the furnace is effectively improved, the working rate is improved, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of non-blast furnace ironmaking, in particular to a method for protecting the lining of a smelting reduction furnace in the HIsmelt process. Background technique [0002] The following reactions mainly occur in the HIsmelt process smelting reduction furnace (Smelt Reduction Vessel hereinafter referred to as SRV furnace). In the molten pool area, the solid spray gun sprays the preheated ore powder, granular coal and solvent into the molten iron pool together, and the solid raw materials are Spray into the depth of the molten pool at a high speed, the jet begins to contact the molten iron in the molten pool, the carbon melts in the molten iron, and the iron oxides in the charge are reduced by dissolved carbon to form CO and molten iron. The gangue, flux, and ash from the coal powder fuse to form slag. The gas space above the molten pool area is called the gas area. The volatile matter in the coal is cracked t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B11/00
CPCC21B11/00Y02P10/20
Inventor 孟玉杰张福明毛庆武李欣戴建华梅从华章启夫曹朝真王维乔刘永
Owner BEIJING SHOUGANG INT ENG TECH
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