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Hydrogen hot metal desulfurization method

A technology for desulfurization of molten iron and hydrogen, applied in the field of desulfurization of molten iron, can solve the problem that desulfurization efficiency has not been greatly improved, and achieve the effects of excellent desulfurization effect, expansion of varieties, and simplification of steelmaking operations.

Active Publication Date: 2022-01-28
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage of this method is that the desulfurization efficiency has not been greatly improved

Method used

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  • Hydrogen hot metal desulfurization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment conditions: molten iron temperature 1330 ℃, initial sulfur content of 0.035%, the target was 0.003% sulfur content, iron 110T tank capacity (such as figure 1 Indicated.

[0037] Hydrogen gas desulphurization method comprising the steps of:

[0038] Sl, hydrogen gas is compressed to give pretreated hydrogen; Then, under conditions of injection pressure of 50MPa, by a top blowing lance in a top-blown from the blowing holes manner, the hydrogen gas in the pretreatment 40m 3 / H flow rate of top-blown blown into the molten iron in the ladle closed; at the injection pressure, the molten iron to achieve a predetermined high-pressure state. Wherein said top blowing lance disposed at the center position of the hot metal surface of the iron in the tank; and the blow hole of the hot metal surface from a height of 200mm; the blow hole of the nozzle diameter 8mm.

[0039]S2, the pretreatment step S1 for the top-blowing hydrogen treatment after 10min, the reaction with the mo...

Embodiment 2-5

[0047] Example 1 except that: the injection pressure different settings in step S1, the other steps are the same as in Example 1, are not repeated here.

[0048] Example Spray pressure Blowing method Desulfurization effect Example 1 50MPa Top-blowing 83.49％ Example 2 2MPa Top-blowing 80.05％ Example 3 20MPa Top-blowing 81.11％ Example 4 80MPa Top-blowing 85.76％ Example 5 120MPA Top-blowing 88.92％ Contrast 1 / Top-blowing 38.76％ Contrast 2 / Bottom blowing 43.56％

[0049] From the above table it can be seen, with increasing injection pressure, desulfurization efficiency showed a gradual upward trend. This is mainly due to: hydrogen by compression processing, the high-pressure hydrogen gas during top-blowing through the molten iron, increases the solubility of hydrogen in the molten iron, while increasing the hydrogen outlet discharge speed, increase the hot metal sulfur and hydrogen the chance of contact, so that a more...

Embodiment 6-8

[0053] Example 1 differs in that: the top-blowing different flow rate settings are the same as in Example 1 and the other steps are not repeated here.

[0054] Example Top blow traffic Desulfurization efficiency Example 1 40M 3 / h

[0055] With the reduced flow rate of top-blowing, top blowing lance near wall region of turbulent kinetic energy and the speed is gradually reduced, the gas tank also increased the residence time in the molten iron, sputtering is reduced. However, too small flow rate of top-blown molten iron against agitation tank hydrogen flow field.

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Abstract

The invention provides a hydrogen hot metal desulfurization method, which adopts a hydrogen top blowing method combined with a two-step process of injection pressurization-recovery decompression to carry out efficient desulfurization reaction of molten iron and recovery of gas after reaction. Firstly, the hydrogen gas is subjected to compression treatment, and the hydrogen gas is blown into the molten iron in the molten iron tank under the predetermined blowing pressure condition; after performing the top blowing treatment for 10 to 20 minutes, the molten iron fully reacts with the pretreated hydrogen gas to form hydrogen sulfide gas; then, decompress and pump the molten iron tank, adjust the pressure in the molten iron tank to a predetermined decompression pressure, recover the hydrogen sulfide gas, and obtain desulfurized molten iron. Compared with the traditional chemical desulfurizer molten iron desulfurization method, the method provided by the invention combines the top blowing method with injection pressurization-recovery and decompression treatment to realize slag-free gasification desulfurization, has excellent desulfurization effect, and is economical and environmentally friendly. Advantages, used for the production of low-sulfur, ultra-low-sulfur high-quality steel.

Description

Technical field [0001] The present invention relates to desulfurization of hot metal, and in particular, to a hydrogen gas desulphurization process. Background technique [0002] With the rapid development of modern industry and science and technology, the requirements of the increasing quality of steel. High performance steel generally has high strength, high toughness, good cold formability and weldability, uniform mechanical properties and high resistance to hydrogen induced cracking capability. Except for a few special-purpose steel cutting steel, silicon steel, steel wire and a few, most steels regarded as pests sulfur impurities. Sulfur in the form of iron sulfide in steel in a solid state, since the iron sulfide and the low melting point defects and poor shaping, so that the steel susceptible to "hot shortness" phenomenon at high temperature ductility decreases steel formability and weldability. Accordingly, in order to avoid internal cracking slab and to obtain good surfa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/072C21C7/064
CPCC21C7/072C21C7/064
Inventor 周建安裴培炎付晓晨王怡王宝成日金
Owner WUHAN UNIV OF SCI & TECH
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