Method for assisting steelmaking and slag-making by utilizing tailings in duplex process and semisteel steelmaking method

A duplex process and tailings technology, applied in the field of metallurgy, can solve the problems of affecting end-point control, frequent fluctuation of molten steel temperature, etc., and achieve the effects of low cost, environmental protection and employee health, and stable end-point control.

Active Publication Date: 2014-05-21
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the composite slag-making material is added into the converter along with the slag material, which is likely to cause frequent fluctuations in the temperature of molten steel in the furnace, thereby affecting the defect of the end point control

Method used

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  • Method for assisting steelmaking and slag-making by utilizing tailings in duplex process and semisteel steelmaking method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: The method of using tailings to assist steelmaking and slag production in this dual process and the semi-steel steelmaking method adopt the following process steps.

[0024] (1) The mixed slag material composed of steelmaking tailings and Si-containing slag-forming materials is sent to the high-level silo of the vanadium extraction converter, and the Si-containing slag-forming materials account for 50wt% of the mixture. Among them, the steelmaking tailings is furnace slag, its composition: CaO 32.5%, SiO 2 11.6%, the addition amount is 6kg / t (that is, 6kg of furnace slag is added to each ton of semi-steel); soil); the particle size of the mixed slag is 20mm.

[0025] (2) The mixed slag is added to the feed car from the high-level silo. When the vanadium is extracted and the converter is tapped, the mixed slag is evenly added into the ladle through the chute of the feed car along with the steel flow; when tapping, the bottom blowing and stirring ensure th...

Embodiment 2

[0028]Embodiment 2: The method of using tailings to assist steelmaking and slag production in this dual process and the semi-steel steelmaking method adopt the following process steps.

[0029] (1) Mix steelmaking tailings with Si-containing slag-forming materials and send them to the high-level silo of the vanadium extraction converter. Si-containing slag-forming materials account for 40wt% of the mixed slag material. Steelmaking tailings are slag-coated, and its composition is: CaO 42.1wt%, SiO 2 18%, the addition amount is 6.9kg / t; the Si-containing slag-forming material is quartz sand, and the addition amount is 4.6kg / t; the particle size of the mixed slag material is 15mm.

[0030] (2) This step is the same as in Example 1.

[0031] (3) After the pre-slagged semi-steel is blended into the steelmaking converter, the oxygen lance is lowered for blowing with oxygen supply. The oxygen lance is located at 1.6m and the pressure is 0.80Map. When oxygen supply starts, add activ...

Embodiment 3

[0033] Embodiment 3: The method of using tailings to assist steelmaking and slag production in this dual process and the semi-steel steelmaking method adopt the following process steps.

[0034] (1) Mix steelmaking tailings and Si-containing slag-making materials to the high-level bin of the vanadium extraction converter. Si-containing slag-making materials account for 30wt% of the mixed slag; steelmaking tailings are a mixture of furnace slag and slag-coated , CaO 33wt% in furnace slag, SiO 2 12.0wt%, CaO 43.2wt% in slag, SiO 2 20wt%; the weight ratio of the two furnace slag: slag coating = 2:1, the addition amount is 6.3kg / t; the Si-containing slagging material is a mixture of ferrite and quartz sand, the addition amount is 2.7kg / t, two The weight ratio of bauxite: quartz sand = 2:1; the particle size of the mixed slag is 5mm.

[0035] (2) This step is the same as in Example 1.

[0036] (3) After the pre-slagged semi-steel is mixed into the steelmaking converter, the ox...

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Abstract

The invention discloses a method for assisting the steelmaking and slag-making by utilizing tailings in a duplex process and a semisteel steelmaking method. The method comprises the following steps: uniformly mixing the steelmaking tailings with a silicon-containing slag-making material to obtain mixed slag; adding the mixed slag into a steel ladle along the semisteel flow when the semisteel is discharged, and stirring the mixed slag by blowing air from the bottom so as to pre-smelt the mixed slag in the steel ladle; pouring the pre-molten mixed slag into a steelmaking converter to be processed in semisteel steelmaking after the semisteel discharging is ended. According to the method, the converter steelmaking slag is pre-slagged, so that the problem that the successful slag-making is influenced by the frequent fluctuation of the temperature of steel liquid in the converter caused by adding a great amount of different slag into the converter can be avoided, and the end-point control is stabilized. The steelmaking tailings are waste tailings, the cost is low, after being molten, the tailings directly enter the metal liquid through the steelmaking chemical reaction, so that the metal yield can be improved, the energy consumption can be saved, and the production cost can be effectively reduced. The material covers the surface of the liquid after being molten, so that the smoke problem in the steelmaking process can be solved, and the environment and the employee health can be protected.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method of using tailings to assist steelmaking and slag production in a double process and a half-steel steelmaking method. Background technique [0002] For iron and steel enterprises using vanadium-titanium magnetite as raw materials, the molten iron for steelmaking contains a certain amount of trace elements such as vanadium and titanium (abbreviated as vanadium-containing molten iron). In order to extract vanadium from vanadium-containing molten iron, a double-link process is adopted. That is, semi-steel is used to make steel after the vanadium-containing molten iron is extracted from vanadium; since Si, Mn and other elements in the molten iron are mostly oxidized into the vanadium slag during the vanadium extraction process, the content of Si, Mn and other elements in the semi-steel is traces, and the composition of steelmaking slag Single; therefore, there is a problem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/36C21C5/28
Inventor 李彦军翁玉娟乔国平韩春良贺保堂王瑞军
Owner HEBEI IRON AND STEEL
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