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Furnace lining material for converter extracting vanadium and preparation method thereof

A furnace lining material and converter technology, applied in the field of vanadium extraction converter lining material and its manufacturing, can solve the problems of low melting temperature, low high temperature strength, low viscosity, etc., and achieve uniform distribution of pores, high temperature strength, and small average pore size Effect

Inactive Publication Date: 2010-08-18
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the particularity of vanadium-titanium magnetite smelting, the vanadium extraction slag contains high vanadium oxide content, low melting temperature and low viscosity, which strongly corrodes magnesia-carbon refractory materials and seriously affects the service life of vanadium extraction converter lining bricks. The base furnace age without repairs is only 2000-3000 furnaces. If the furnace age exceeds this age, vanadium extraction will be maintained entirely by repairs. The lower base furnace age increases the loss of refractory materials, which seriously restricts the vanadium extraction process and becomes a steelmaking process. the bottleneck
[0003] Therefore, the existing magnesia-carbon bricks have the problems of poor adaptability to vanadium-titanium slag, low high-temperature strength, and low service life.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A furnace lining material for a vanadium extraction converter and a manufacturing method thereof: fused magnesia with a particle size of 5 to 3 mm, fused magnesia with a particle size of 3 to 1 mm, and fused magnesia with a particle size of 1 to 0.088 mm , fused magnesia fine powder with a particle size of less than 0.088mm, SiC with a particle size of 1 to 0.088mm, flake graphite with a particle size of less than 0.088mm, and metal aluminum powder with a particle size of less than 0.088mm at 15 to 20wt%, 15 ~20wt%, 10~15wt%, 10~15wt%, 15~30wt%, 11~15wt% and 3~5wt% are mixed, and the phenolic resin of above-mentioned mixture 2~4wt% is added, and mixed in the mixing mill. Then it is machine-pressed and baked at 250-300°C for 16-24 hours. The obtained apparent porosity is 2-4%, and the bulk density is 2.90-2.98g / cm 3 , Lining materials for vanadium extraction converters with an average pore size of 1-10 μm, a normal temperature compressive strength of 45-65 MPa, and a hi...

Embodiment 2

[0014] A furnace lining material for a vanadium extraction converter and a manufacturing method thereof: fused magnesia with a particle size of 5 to 3 mm, fused magnesia with a particle size of 3 to 1 mm, and fused magnesia with a particle size of 1 to 0.088 mm , fused magnesia fine powder with a particle size of less than 0.088mm, SiC fine powder with a particle size of less than 0.088mm, flake graphite with a particle size of less than 0.088mm, metal aluminum powder with a particle size of less than 0.088mm and elemental silicon with a particle size of less than 0.088mm The powder is mixed according to 22~25wt%, 18~25wt%, 12~15wt%, 18~20wt%, 3~15wt%, 9~12wt%, 1~2wt% and 2~3wt%, plus the above-mentioned mixture 2~ 4wt% phenolic resin, mixed uniformly in a mixer. Then it is machine-pressed and baked at 250-300°C for 16-24 hours. The obtained apparent porosity is 2-4%, and the bulk density is 2.95-3.05g / cm 3 , Lining materials for vanadium extraction converters with an averag...

Embodiment 3

[0016] A furnace lining material for a vanadium extraction converter and a manufacturing method thereof: fused magnesia with a particle size of 5 to 3 mm, fused magnesia with a particle size of 3 to 1 mm, and fused magnesia with a particle size of 1 to 0.088 mm , fused magnesia fine powder with a particle size of less than 0.088 mm, SiC with a particle size of 1 to 0.088 mm, SiC fine powder with a particle size of less than 0.088 mm, flake graphite with a particle size of less than 0.088 mm, and metal with a particle size of less than 0.088 mm Aluminum powder, elemental silicon powder with a particle size of less than 0.088mm and B with a particle size of less than 0.088mm 4 C fine powder according to 20~22wt%, 15~18wt%, 15~17wt%, 15~18wt%, 5~10wt%, 5~10wt%, 10~12wt%, 1~1.5wt%, 1~2wt% It is mixed with 1-1.5 wt%, and 2-4 wt% of the above-mentioned phenolic resin is added, mixed evenly in a mixer mill, and then machine-pressed. Bake at 250-300°C for 16-24 hours. The apparent p...

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Abstract

The invention relates to a furnace lining material for a converter extracting vanadium and a preparation method thereof. The technical scheme adopts the following steps: mixing 50-85 percent by weight of fused magnesite, 3-30 percent by weight of SiC, 9-15 percent by weight of crystalline flake graphite fine powder and 3-5 percent by weight of antioxidant; additionally adding 2-4 percent by weight of phenolic resin into the mixed material; uniformly mixing the material in a mixing mill; forming by pressing of a machine and drying at the temperature of 250-300DEG C for 16-24h, wherein the antioxidant is more than one of metallic aluminum, a simple substance silicon and B4C and the grain diameter of the antioxidant is less than 0.088m; the content of MgO in the fused magnesite is more than 97 percent and the grain diameter of the fused magnesite is less than 5mm; the grain diameter of the SiC is les than 1mm; and the grain diameter of crystalline flake graphite is less than 0.088mm. The product has the characteristics of low porosity, small average pore size, uniform pore distribution, high temperature and strength, strong adaptability to vanadium-titanium slag and long service life.

Description

technical field [0001] The invention belongs to the technical field of furnace lining materials. Specifically relates to a furnace lining material for a vanadium extraction converter and a manufacturing method thereof. Background technique [0002] Domestic Panzhihua Iron and Steel and Chengde Iron and Steel use vanadium-titanium-magnetite as the main raw material for iron ore smelting. Compared with ordinary iron ore smelting, there is an additional link of vanadium extraction between the blast furnace and the converter. The equipment directly adopts the steelmaking converter, so the lining refractory material also adopts magnesia carbon bricks accordingly. Due to the particularity of vanadium-titanium magnetite smelting, the vanadium extraction slag contains high vanadium oxide content, low melting temperature and low viscosity, which strongly corrodes magnesia-carbon refractory materials and seriously affects the service life of vanadium extraction converter lining brick...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/66C22B34/22
Inventor 韩兵强李楠王长民李友胜杨强王怀斌
Owner WUHAN UNIV OF SCI & TECH
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