Composite desulfurizer for molten iron desulphurization or semisteel desulphurization and process method thereof

A process method and technology for desulfurization of molten iron, which are applied in the field of metallurgical production, can solve the problems of inability to meet the smelting requirements of steel-making steel grades, low desulfurization efficiency, large splash, etc., and achieve high iron loss, low desulfurization efficiency, and reduced iron loss. Effect

Active Publication Date: 2017-09-29
PANGANG GRP PANZHIHUA STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current desulfurization process is mixed injection desulfurization. When the desulfurizer is used for semi-steel desulfurization, it has th

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0014] Example 1:

[0015] After vanadium-containing titanium molten iron is blown oxygen through a converter to extract vanadium in the molten iron, vanadium-rich vanadium slag and sulfur-containing semi-steel are formed respectively. After the high-sulfur semi-steel enters the desulfurization station, the weight is 139.0 tons, the temperature is 1362℃, and the composition is: C3.54%, Mn0.02%, V0.022%, Si0.02%, S0.095%, P0.053 %, Ti0.004% and the balance of iron and unavoidable impurities. Using the original mixed injection equipment, the target sulfur is set to 0.020%, and 1042 kg of the composite desulfurizer of the present invention is added to perform injection desulfurization. In the blowing process, the spray is small, the flame is small, and there is no smoke and dust overflow. After the desulfurization, the slag scraper is used to remove the desulfurization slag, and the desulfurization slag is removed for 5.5 minutes. After removing the slag, weigh, measure the tempe...

Example Embodiment

[0016] Example 2:

[0017] After vanadium-containing titanium molten iron is blown oxygen through a converter to extract vanadium in the molten iron, vanadium-rich vanadium slag and sulfur-containing semi-steel are formed respectively. After the high-sulfur semi-steel enters the desulfurization station, the weight is 137.0 tons, the temperature is 1345℃, and the composition is: C3.56%, Mn0.02%, V0.031%, Si0.02%, S0.078%, P0.054 %, Ti0.003% and the balance of iron and unavoidable impurities. Using the original composite injection equipment, the target sulfur is set to 0.008%, and 947 kg of the desulfurizing agent of the present invention is added to perform injection desulfurization. In the blowing process, the spray is small, the flame is small, and there is no smoke and dust overflow. After the desulfurization is completed, the desulfurization slag is removed by a slag scraper, and the desulfurization slag is removed in 5.0 minutes. After removing the slag, weigh, measure the...

Example Embodiment

[0018] Example 3:

[0019] The vanadium-containing titanium molten iron weighs 138.5 tons after the tank is assembled, the temperature is 1275°C, and the composition is: C4.28%, Mn0.22%, V0.31%, Si0.15%, S0.072%, P0.053%, Ti is 0.15%, using 924 kg of the desulfurizing agent of the present invention for injection desulfurization. In the blowing process, the spray is small, the flame is small, and there is no smoke and dust overflow. After the desulfurization, the desulfurization slag is removed by a slag scraper, and it takes 5.3 minutes for the desulfurization slag to be exhausted. After removing the slag, weigh, measure temperature and sample and analyze the semi-steel after the desulfurization slag is removed. The weight of the semi-steel after the removal of the desulfurization slag is 134.5 tons, the temperature is 1250°C, and the composition is C4.27%. , Mn0.22%, V0.30%, Si0.15%, S0.007%, P0.53%, Ti0.15%, and the balance of iron and unavoidable impurities. It is calculate...

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PUM

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Abstract

The invention discloses a composite desulfurizer for molten iron desulphurization or semisteel desulphurization and a process method thereof and belongs to the technical field of metallurgical production. According to the composite desulfurizer for molten iron desulphurization or semisteel desulphurization and the process method thereof, during desulphurization, the iron loss is little, efficiency is high, and the steelmaking steel grade smelting need can be met. The composite desulfurizer is a powder mixture at least comprising CaO, Mg, Na2O, CaC2, Al, Al2O3 and SiO2. The process method comprises the step that the composite desulfurizer of the components is injected to the lower-middle portion of molten iron needing to be desulphurized or the lower-middle portion of semisteel needing to be desulphurized along with nitrogen through a nitrogen conveying pipeline.

Description

technical field [0001] The invention relates to a composite desulfurizer, in particular to a composite desulfurizer for molten iron desulfurization or semi-steel desulfurization, and belongs to the technical field of metallurgical production. The invention also relates to a process for desulfurizing molten iron or semi-steel by using the composite desulfurizer. Background technique [0002] In the prior art, the hot metal pretreatment process is a combination of desulfurization and vanadium extraction. However, due to the layout of the existing process, it is divided into two processes: first desulfurization and then vanadium extraction, and first vanadium extraction and then desulfurization. The semi-steel after vanadium extraction has high carbon and low temperature, and silicon, vanadium and manganese are the residual amount, and then desulfurization outside the furnace can accurately correspond to the type of steel being made. Since the net weight of blast furnace hot ...

Claims

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Application Information

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IPC IPC(8): C21C7/064C21C1/02
CPCC21C1/025C21C7/0037C21C7/0645
Inventor 张家利王二军黄正华夏艳李扬洲解明科
Owner PANGANG GRP PANZHIHUA STEEL & VANADIUM
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