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Double-slag-method smelting process

A double-slag method and process technology, which is applied in the direction of improving process efficiency and manufacturing converters, can solve the problems of difficult pouring of slag, poor dephosphorization effect, and long smelting cycle, so as to avoid overoxidation of molten steel and shorten smelting cycle , The effect of low phosphorus content in molten steel

Active Publication Date: 2018-12-28
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above analysis, the present invention aims to provide a double-slag smelting process to solve the problems of poor dephosphorization effect, high slag consumption, difficult pouring of slag, long smelting cycle, and overoxidation of molten steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] In this embodiment, the experiment of a 500kg induction furnace is taken as an example, the charging amount of molten iron is 400kg, two branches are blown at the bottom, and the conditions of molten iron are: Si=0.3%, Mn=0.2%, P=0.12%, C=4.3%;

[0070] Top-bottom combined oxygen blowing rapid desiliconization and demanganization stage: gun position 20cm, top blowing oxygen flow rate 1.6Nm 3 / min, bottom blowing oxygen flow rate is 0.6Nm 3 / min, the oxygen blowing time of top blowing oxygen and bottom blowing oxygen is 1.5min;

[0071] Top-blown oxygen, bottom-blown inert gas dephosphorization stage: gun position 30cm, top-blown oxygen flow rate 1.2Nm 3 / min, bottom blowing nitrogen flow rate is 0.25Nm 3 / min, at the same time, the amount of lime powder sprayed by bottom blowing is 3kg, and the oxygen blowing time and nitrogen blowing time are both 3min.

[0072] Foaming dephosphorization slag control stage: gun position 25cm, oxygen flow rate 1.0Nm 3 / min, bottom b...

Embodiment 2

[0083] In this embodiment, the experiment of a 50t converter is taken as an example, the molten iron load is 45t, bottom blowing 4 branches, molten iron conditions: Si = 0.5%, Mn = 0.2%, P = 0.14%, C = 4.5%;

[0084] Top-bottom combined oxygen blowing rapid desiliconization and demanganization stage: gun position 1.5m, top blowing oxygen flow rate 135Nm 3 / min, bottom blowing oxygen flow rate is 36Nm 3 / min, the oxygen blowing time of top-blown oxygen and bottom-blown oxygen is 1.5min;

[0085] Top-blown oxygen, bottom-blown inert gas dephosphorization stage: gun position 3.0m, top-blown oxygen flow rate 90Nm 3 / min, bottom blowing nitrogen flow rate is 9Nm 3 / min, and at the same time, 600kg of limestone powder is blown at the bottom, and the oxygen blowing time and nitrogen blowing time are both 4min.

[0086] Foaming dephosphorization slag control stage: 50s before the end of the dephosphorization period, the oxygen flow rate at 2.0m of the gun position is 90Nm 3 / min, ...

Embodiment 3

[0097] In this embodiment, the experiment of a 50t converter is taken as an example, the molten iron load is 45t, bottom blowing 4 branches, molten iron conditions: Si = 0.55%, Mn = 0.21%, P = 0.16%, C = 4.43%;

[0098] Top-bottom combined oxygen blowing rapid desiliconization and demanganization stage: gun position 2.0m, top blowing oxygen flow rate 180Nm 3 / min, bottom blowing oxygen flow rate is 67.5Nm 3 / min, the oxygen blowing time of top blowing oxygen and bottom blowing oxygen is 80s;

[0099] Top blowing oxygen, bottom blowing inert gas dephosphorization stage: gun position 5.0m, oxygen flow rate 135Nm 3 / min, bottom blowing nitrogen flow rate is 36Nm 3 / min, and at the same time, 250kg of lime powder is blown at the bottom, and the oxygen blowing time and nitrogen blowing time are both 3.5min.

[0100] Foaming dephosphorization slag control stage: 100s before the end of the dephosphorization period, gun position 3.0m, oxygen flow rate 135Nm 3 / min, bottom blowing...

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Abstract

The invention relates to a double-slag-method smelting process, belongs to the technical field of converter steelmaking, and solves the problems of poor dephosphorization effect, high slag material consumption, slag not easy to pour out, long smelting cycle and peroxidation of molten steel in an existing smelting process. The double-slag-method smelting process specifically includes dephosphorization of molten iron, dephosphorization slag discharge, and high-strength oxygen-supplying decarburization steelmaking with less slag; the step of dephosphorization of molten iron includes top-bottom oxygen combined blowing for rapid desiliconization and demanganization, and oxygen blowing at top and inert gas blowing at bottom for dephosphorization; the step of dephosphorization slag discharge includes control on foamed dephosphorization slag, pressing of foamed dephosphorization slag, and purging of foamed dephosphorization slag; and the step of high-strength oxygen-supplying decarburization steelmaking with less slag includes high-strength top-bottom oxygen combined blowing decarburization steelmaking, low-strength top-bottom oxygen combined blowing decarbonization steelmaking, low-strength top-bottom oxygen combined blowing carbon-pulling tapping, and bottom inert-gas blowing tapping. The process disclosed by the invention realizes optimal combination of top oxygen blowing, bottom oxygen blowing and supplying technology of inert gas, realizes reasonable matching of technologies of adding blocky slag materials at top and blowing a powder at bottom, and realizes efficient dephosphorization, low slag material consumption and efficient smelting with less slag.

Description

technical field [0001] The invention relates to the technical field of converter steelmaking, in particular to a double slag method smelting process. Background technique [0002] In order to meet the requirements of low-cost production of clean steel by converters, people have systematically analyzed the steel production process, and divided the complex converter steelmaking process into desiliconization, dephosphorization in the early stage of the converter, intermediate slag dumping, decarburization with less slag and temperature rise, controlled blowing The hit rate of the smelting end point and the tapping operation, etc., aim to further reduce the consumption of various raw materials in the smelting process, reduce the amount of slag, and reduce production costs under the premise of ensuring the cleanliness of molten steel. [0003] The converter smelting process is divided into single slag method and double slag method. For the traditional single slag method, the cond...

Claims

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Application Information

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IPC IPC(8): C21C5/35C21C7/064C21C7/068
CPCC21C5/35C21C7/064C21C7/068Y02P10/20
Inventor 王杰杨利彬曾加庆赵舸赵进宣林路崔怀周林腾昌汪成义
Owner CENT IRON & STEEL RES INST
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