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Method for molten steel refining by corundum slag

A corundum slag and molten steel technology, applied in the field of steelmaking, can solve the problems of low impurity content, waste of V resources, environmental pollution, etc., and achieve good refining effect and realize the effect of recycling and utilization.

Active Publication Date: 2014-03-19
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The aluminothermic method has been widely used due to its advantages of short process, high product quality, low impurity content, and high-grade ferrovanadium production. However, a large amount of smelting slag is produced. After being crushed, it is used as crushed stones for road paving, or directly discarded and piled up. Heavy metals such as V and Cr in the slag will pollute the environment and cause a waste of V resources.

Method used

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Examples

Experimental program
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Effect test

example 1

[0027] The corundum slag used in this example comes from the process of electroluminothermic production of vanadium-ferroalloy, mainly including 65wt% Al 2 o 3 , 25wt% CaO, 10wt% MgO, 1.5wt% Fe and 2.5wt% V. Add 1Kg / (t steel) of corundum slag after the converter molten steel is discharged, add 1Kg / (t steel) of corundum slag after the molten steel enters the LF station, heat up the lower electrode, add fluorite 0.3Kg / (t after 2 minutes of power on steel), active lime 3Kg / (t steel) for slag; add active lime and aluminum particles in 2 batches and heat up refining, the amount of active lime added in each batch is 0.3Kg / (t steel), and the amount of aluminum particles added is 0.2Kg / (t Steel), each batch of materials (that is, active lime and aluminum particles) is added at an interval of 8 minutes, and the last batch of active lime and aluminum particles is added 15 minutes before the end of refining and alloyed according to the composition of molten steel. Among them, the argon...

example 2

[0029] The corundum slag used in this example comes from the process of electroluminothermic production of vanadium-ferroalloy, mainly including 75wt% Al 2 o 3 , 15wt% CaO, 5wt% MgO, 1.4wt% Fe and 2.5wt% V.

[0030] Add 2Kg / (t steel) of corundum slag after the converter molten steel is discharged, add 0.5Kg / (t steel) of corundum slag after the molten steel enters the LF station, heat up the lower electrode, add fluorite 0.5Kg / ( t steel), active lime 1Kg / (t steel) for slagging; add active lime and aluminum particles in 3 batches and heat up refining, the addition of each batch of active lime is 0.5Kg / (t steel), and the addition of aluminum particles is 0.1Kg / ( t steel), each batch of materials (that is, active lime and aluminum particles) is added at an interval of 9 minutes, and the last batch of active lime and aluminum particles is added 10 minutes before the end of refining and alloyed according to the composition of molten steel. Among them, the argon blowing flow rate i...

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PUM

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Abstract

The invention provides a method for molten steel refining by corundum slag. The method comprises the following steps: after steel tapping from a converter, adding 1-2 Kg / (ton of steel) of corundum slag into a steel ladle; after the steel ladle is subjected to the steel ladle refining procedure, adding 0.5-1 Kg / (ton of steel) of corundum slag into the steel ladle again, then heating with an electrode, adding fluorite and active lime into the steel ladle for slugging, adding active lime and aluminous deoxidizing agents in batches to carry out desulphurization refining; wherein the corundum slag is slag generated during vanadium iron alloy production by an electric thermite method, and the corundum slag comprises the following components by weight percent: 65-75% of Al2O3, 15-25% of CaO, and 5-10% of MgO. The method of the invention solves the recycle problem of slag generated in vanadium iron alloy smelting, and has good refining desulphurization effect.

Description

technical field [0001] The invention relates to the technical field of steelmaking, and more specifically, relates to a method for refining molten steel. Background technique [0002] Panzhihua mining area is rich in vanadium-titanium magnetite. Vanadium-titanium magnetite has a high content of vanadium in molten iron and slag after blast furnace smelting. The recovery and utilization of vanadium includes the use of vanadium slag to prepare V 2 o 5 Production of ferro-vanadium alloys. At present, the production methods of vanadium ferroalloy include electric silicothermal method and electric aluminothermic method. Among them, when electroluminothermic method is used to prepare vanadium ferroalloy, in order to reduce the vanadium oxide in the vanadium slag, a certain amount of metal aluminum should be added during the smelting process; Activated lime is used for slagging; at the same time, because the furnace lining is made of magnesia ramming material, some magnesium oxid...

Claims

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Application Information

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IPC IPC(8): C21C7/076C21C7/00C21C7/06C21C7/064
CPCY02P10/20
Inventor 陈炼陈永戈文荪李龙向丽杨森祥杜利华翁建军何为
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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