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Method for protecting converter with vanadium slag

A vanadium slag and slag splashing technology, which is applied in the field of vanadium extraction from converters, can solve problems such as slag splashing in converters that are not involved in vanadium extraction, and achieve the effects of improving the effect of slag hanging, improving the anti-scouring ability, and increasing the service life of the furnace lining

Active Publication Date: 2013-11-20
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the above-mentioned existing technologies have all targeted the steelmaking converter, and have not involved the slag splashing of the vanadium extracting converter to protect the furnace.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] After the vanadium-containing molten iron obtained from blast furnace ironmaking is mixed into the vanadium extraction converter, 5kg / tFe of quartz sand is added. Add 35kg per ton of molten iron). In this example, the specific composition of vanadium extraction coolant is: CaO0.5%, TFe57%, MgO2.6%, Al 2 o 3 3.75%, SiO 2 7.33%, TiO 2 4.2% and a small amount of impurities.

[0026] The position of the oxygen lance is controlled by the "high-low-high" mode (that is, the position of the oxygen lance is 1200mm within 30s of the start of blowing, the position of the oxygen lance is 1000mm during the period of 30-300s of oxygen blowing, and the position of the oxygen lance is 1000mm for 300s to the end of the oxygen blowing The position of the front oxygen lance is 1200mm), the blowing time is controlled at 5min, and the temperature of the semi-steel is controlled at 1400-1450°C. After the blowing is finished, the semi-steel is produced, the vanadium slag remains in the c...

example 2

[0029] After the vanadium-containing molten iron obtained from blast furnace ironmaking is mixed into the vanadium extraction converter, 2kg / tFe of quartz sand is added. After blowing starts, 25kg / tFe of magnesia is added, and the amount of coolant for vanadium extraction is 25kg / TFe. In this example, the specific composition of vanadium extraction coolant is: CaO0.4%, TFe59%, MgO1.6%, Al 2 o3 2.5%, SiO 2 6.9%, TiO 2 2.7% and a small amount of impurities.

[0030] The position of the oxygen lance is controlled by the "high-low-high" mode (that is, the position of the oxygen lance is 1500mm within 30s of the start of blowing, the position of the oxygen lance is 1200mm during the period of 30-300s of oxygen blowing, and the position of the oxygen lance is 1200mm during the period of 300s to the end of oxygen blowing The position of the front oxygen lance is 1500mm), the blowing time is controlled to 7min, and the temperature of the semi-steel is controlled within the range of ...

example 3

[0033] After the vanadium-containing molten iron obtained from blast furnace ironmaking is mixed into the vanadium extraction converter, 3kg / tFe of quartz sand is added. After blowing starts, 20kg / tFe of magnesia is added, and the amount of coolant for vanadium extraction is 30kg / TFe. In this example, the specific composition of vanadium extracting coolant is: CaO0.5%, TFe62%, MgO2.2%, Al 2 o 3 1.4%, SiO 2 7.2%, TiO 2 3.8% and a small amount of impurities.

[0034] The position of the oxygen lance is controlled by the "high-low-high" mode (that is, the position of the oxygen lance is 1300mm within 30s of the blowing, and the position of the oxygen lance is 1100mm during the period of 30-300s of oxygen blowing, and the position of the oxygen lance is 1100mm for 300s to the end of the oxygen blowing. The position of the front oxygen lance is 1400mm), the blowing time is controlled at 6min, and the temperature of the semi-steel is controlled at 1400-1450°C. After the blowing,...

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Abstract

The invention provides a method for protecting a converter with vanadium slag, which comprises the following steps: adding vanadium-iron-containing water into a vanadium extraction converter, and adding quartz sand into the vanadium-iron-containing water to regulate the SiO2 content in the vanadium slag to 16-18%; after the converting starts, adding 10-25 kg / tFe magnesite, and adding 25-35 kg / tFe vanadium extraction cooling agent, wherein the converting time is controlled at 5-7 minutes, and the semisteel temperature is controlled at 1400-1450 DEG C; and after the converting finishes, tapping, blowing nitrogen with an oxygen lance to perform slag splashing on the vanadium slag. The invention can effectively solve the problems of poor flowability and difficulty in adhesion of the vanadium slag, and can improve the slag suspension effect, enhance the erosion resistance of the converter lining and effectively prolong the service life of the vanadium extraction converter lining when being used for slag splashing converter protection.

Description

technical field [0001] The invention belongs to the technical field of vanadium extraction in converters, and specifically relates to a method for protecting a vanadium extraction converter by splashing slag with vanadium slag. Background technique [0002] In the prior art, the converter is the main equipment produced by iron and steel enterprises, and its service life is directly related to the production cost of the converter. The slag splashing furnace protection technology can greatly increase the service life of the steelmaking converter. [0003] At present, the vertical oxygen lance method is commonly used in steelmaking converters. Its technological features are as follows: use the top-blown oxygen lance to switch nitrogen, spray the modified final slag, and coat it on the inner wall of the converter lining. By changing the spray angle, a certain part can be sprayed purposefully. Before blowing, excessive dolomite and lime are added, and the erosion of the furnac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C5/36C21C5/44
Inventor 陈炼陈永戈文荪曾建华王建蒋龙奎卓钧陈怀杰黄正华董克平
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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