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Multistage combined pretreatment method for vanadium-bearing molten iron

A combined pretreatment technology, which is applied in the field of pig iron refining, can solve the problems of unreasonable furnace charge structure, heavy blast furnace load, and large consumption, and achieve the effects of reducing lime consumption, reducing desulfurization load, and liberating blast furnaces

Active Publication Date: 2011-08-24
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above reasons show that the hot metal pretreatment process for desulfurization, dephosphorization and vanadium extraction of vanadium-containing hot metal is very different from the common hot metal pretreatment process. Using ordinary vanadium-containing molten iron and treatment process alone has problems such as heavy blast furnace load, unreasonable charge structure, and large consumption

Method used

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  • Multistage combined pretreatment method for vanadium-bearing molten iron
  • Multistage combined pretreatment method for vanadium-bearing molten iron
  • Multistage combined pretreatment method for vanadium-bearing molten iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The amount of molten iron in the molten iron package is 162 tons, and the composition of the molten iron is shown in the table below:

[0025]

[0026] First, hoist it to the desulfurization station for desulfurization treatment. The desulfurization results and process parameters are shown in the following table:

[0027]

[0028] The molten iron after desulfurization is mixed into the vanadium extracting converter, and 15 tons of iron nuggets are added to carry out blowing with oxygen supply. The process control and end point are as follows:

[0029]

[0030] Then carry out semi-steel tapping operation (the semi-steel tapping volume is 169 tons), the semi-steel tapping time is 4 minutes, and the working pressure of nitrogen blowing at the bottom of the ladle reaches 0.2Mpa. The addition amount of oxide scale is 3kg / t semi-steel, and the addition amount of dephosphorization agent is 4kg / t semi-steel. After the semi-steel has been delivered, it is hoisted to th...

Embodiment 2

[0034] The amount of molten iron in the molten iron package is 161 tons, and the composition of the molten iron is shown in the table below:

[0035]

[0036] First, hoist it to the desulfurization station for desulfurization treatment. The desulfurization results and process parameters are shown in the following table:

[0037]

[0038] The molten iron after desulfurization is mixed into the vanadium extracting converter, and 14 tons of iron nuggets are added to carry out blowing with oxygen supply. The process control and end point are as follows:

[0039]

[0040] Then carry out semi-steel tapping operation (the semi-steel tapping volume is 167 tons), the semi-steel tapping time is 5 minutes, and the working pressure of nitrogen blowing at the bottom of the ladle reaches 0.2Mpa. The addition amount of oxide scale is 4kg / t semi-steel, and the addition amount of dephosphorization agent is 5kg / t semi-steel. After the semi-steel is delivered, it is hoisted to the slag...

Embodiment 3

[0044] The amount of molten iron in the molten iron package is 162 tons, and the composition of the molten iron is shown in the table below:

[0045]

[0046] First, hoist it to the desulfurization station for desulfurization treatment. The desulfurization results and process parameters are shown in the following table:

[0047]

[0048] Then blend into the vanadium extracting converter, add 18 tons of iron block, and carry out oxygen blowing. The process control and end point are as follows:

[0049]

[0050] Then carry out semi-steel tapping operation (the semi-steel tapping volume is 169 tons), the semi-steel tapping time is 6 minutes, and the working pressure of nitrogen blowing at the bottom of the ladle reaches 0.3MPa. The addition amount of oxide scale is 5kg / t semi-steel, and the addition amount of dephosphorization agent is 6kg / t semi-steel. After the semi-steel is delivered, it is hoisted to the slag removal station for slag removal treatment, and then samp...

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Abstract

The invention relates to a multistage combined pretreatment method for vanadium-bearing molten iron, in particular to a molten iron pretreatment process for realizing desulfurization, dephosphorization and vanadium extraction on the vanadium-bearing molten iron, belonging to the technical field of refinement of pig iron. According to the technical scheme, converter vanadium extraction is performed on the vanadium-bearing molten iron to obtain semisteel, and then converter steelmaking is performed on the semisteel. The technical scheme is characterized in that vanadium-bearing molten iron obtained by iron tapping of more than one blast furnace is collected, and the molten iron is pretreated in a three-stage combined mode, wherein at the first stage, granulated magnesium is singly blown in a ladle for desulfurization; at the second stage, vanadium extraction, desilicification and titanium removal are performed by a converter; and at the third stage, dephosphorization is performed in the semisteel tapping process of the vanadium extraction converter. The multistage combined pretreatment method for vanadium-bearing molten iron combines a common molten iron pretreatment process with a special converter vanadium extraction process, thus effectively reducing the costly desulfurization burden of a blast furnace, realizing low coke-ratio operation, and further improving and optimizing the furnace charge structure; and in addition, the multistage combined pretreatment method is favorable for high-speed converting of a steelmaking furnace, and also can provide favorable conditions for intelligent control of the steelmaking furnace by a computer.

Description

technical field [0001] The invention relates to a multi-stage combined pretreatment method for vanadium-containing molten iron, in particular to a molten iron pretreatment process for realizing desulfurization, dephosphorization and vanadium extraction of vanadium-containing molten iron, and belongs to the technical field of pig iron refining. Background technique [0002] Hot metal pretreatment refers to various treatments before the hot metal is mixed into the steelmaking furnace, which is divided into two categories: ordinary hot metal pretreatment and special hot metal pretreatment. Ordinary hot metal pretreatment includes hot metal desulfurization, hot metal desiliconization, and hot metal dephosphorization; special hot metal pretreatment is generally aimed at the purification and refining of special elements contained in hot metal or comprehensive utilization of resources, such as hot metal vanadium extraction, niobium extraction, and chromium removal. craft. The hot ...

Claims

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Application Information

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IPC IPC(8): C21C1/00
Inventor 白瑞国张兴利高海徐立山翁玉娟付焕青
Owner HEBEI IRON AND STEEL
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