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Method of Direct Reductive Alloying of Chromium Ore in 90t Top and Bottom Combined Blowing Converter

A top-bottom combined blowing and alloying technology, which is applied in the manufacture of converters, etc., can solve the problems of converter smelting process control, difficulty in controlling the composition of the end point, difficulty in maintenance, high cost, and high viscosity, so as to protect the furnace lining and maintain stability , the effect of stable dynamic conditions

Inactive Publication Date: 2016-01-20
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 2) When adding chrome ore from the top of the furnace, briquettes or pre-reduced chrome ore are required, and carbon powder and other reducing agents are added; when chrome ore is sprayed from the top or bottom, in addition to pre-grinding the ore, special equipment is also required. The top spray gun or bottom powder spray device requires extremely fine equipment, and the maintenance is difficult and costly;
[0007] 3) After a large amount of chromium ore is added to the converter, the slag is CaO-MgO-Al 2 o 3 -SiO 2 Mainly, with a small amount of Cr 2 o 3 , the slag has a high viscosity and a high melting point, which brings great difficulties to the control of the converter smelting process and the control of the final composition

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In the present embodiment, the specific numerical value of each processing method is:

[0026] In the scrap steel loading method, the molten iron mixed in has a silicon content of 0.1% and a phosphorus content of 0.1% by weight, a temperature of 1260°C, an amount of molten iron loaded of 80t, and the amount of scrap steel added according to [100-(1280-1260)* 6 / 10-2*1600 / 80]*80 / 1000=3.84 tons, namely 3840kg.

[0027] In the slag addition and oxygen blowing method, in the first slagging process, 1600kg of active lime and 480kg of light-burned dolomite were added to the furnace before the blowing started, and oxygen was blown at a gun position of 1.7 meters. Add the second batch of active lime 800kg, lower the lance position to 1.6 meters at the same time, and continue blowing oxygen until 360s, stop blowing, lift the oxygen lance, and pour out 55% of the weight of the slag in the furnace; the second slagging process, one-time Add chrome ore 1600kg, Cr in the described ch...

Embodiment 2

[0031] In the present embodiment, the specific numerical value of each processing method is:

[0032] In the method of loading scrap steel, the content of silicon in the molten iron is 0.5% by weight, the content of phosphorus is 0.15%, the temperature is 1280°C, the amount of molten iron is 78t, and the amount of scrap steel is added according to [150-(1280-1280)* 5.5 / 10-1.6*2730 / 78]*78 / 1000 is calculated as 7332kg.

[0033] In the slag addition and oxygen blowing method, in the first slagging process, 1950kg of active lime and 624kg of light-burned dolomite were added to the furnace before the blowing started, and oxygen was blown at a gun position of 1.7 meters. Add the second batch of active lime 1170kg, lower the lance position to 1.6 meters at the same time, and continue blowing oxygen until 360s, stop blowing, lift the oxygen lance, and pour out 70% of the weight of the slag in the furnace; the second slagging process, one-time Add chrome ore 2730kg, Cr in the describe...

Embodiment 3

[0037] In the present embodiment, the specific numerical value of each processing method is:

[0038] In the method of loading scrap steel, the content of silicon in the molten iron is 0.3% by weight, the content of phosphorus is 0.08%, the temperature is 1300°C, the amount of molten iron is 82t, and the amount of scrap steel is added according to [125-(1280-1300)* 5.8 / 10-1.8*2460 / 82]*82 / 1000 is calculated as 6773.2kg.

[0039] In the slag addition and oxygen blowing method, in the first slagging process, 1800kg of active lime and 570kg of light-burned dolomite were added to the furnace before the blowing started, and oxygen was blown at a gun position of 1.7 meters. Add the second batch of active lime 985kg, lower the lance position to 1.6 meters at the same time, stop blowing when oxygen blowing continues to 345s, lift the oxygen lance, and pour out 60% of the weight of the slag in the furnace; the second slagging process, one-time Add chrome ore 2460kg, Cr in the described...

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Abstract

The invention discloses a method for directly reducing and alloying a chromium ore in a 90t top-bottom combined blowing converter. during the smelting of the converter, the method is carried out in the following way: 1) a scrap steel charging method; 2) slag charging and oxygen blowing methods: adopting a single-converter and two-slag two-step smelting technology; 3) bottom blowing method; 4) top blowing method; and 5) other methods: carrying out related technological methods of the conventional steel balls, wherein the content of metal chromium in the finally produced low-alloy molten steel is 0.45-1.05% and the dephosphorization rate is 88-92%. Smelting tank temperature reduction generated during adding chromium ores is matched with reduction of waste steel, and by adopting the single-converter and two-slag two-step smelting technology, the dephosphorization effect can be guaranteed, the direct reduction and alloying conditions for smelting with less slag can be realized in a single converter, and the yield of chromium is high relatively; therefore, the method is simple in treatment technology, convenient to operate, and low in cost.

Description

technical field [0001] The invention belongs to the technical field of top-bottom combined blowing converter steelmaking, and in particular relates to a method for direct reduction alloying of chromium ore in a 90t top-bottom combined blowing converter. Background technique [0002] Chromium is one of the most important alloying elements in materials such as heat-resistant steel and stainless steel, which can significantly improve the strength, hardness and wear resistance of steel, as well as its resistance to oxidation and corrosion. Under the current conditions, in order to increase the chromium content in steel, chromium alloys or metal chromium are mostly added in the smelting or refining process for chromium alloying operation. However, making chromium-based alloys is an energy-intensive, highly polluting process. The production of ferrochrome per ton needs to consume about 3000-5000KW·h of electric energy, and a large amount of coke is consumed in the manufacturing p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/35C21C5/28
Inventor 杨治争魏伟严翔付勇涛黄成红洪霞陈玮丁金发王羽何亚元
Owner 武汉钢铁有限公司
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