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A kind of molten iron smelting method using kr desulfurization secondary dust removal ash

A technology of secondary dust removal and smelting method, applied in the field of smelting, can solve problems such as environmental pollution, reduce recycling rate, etc., achieve the effects of reducing cost, improving utilization rate, and ensuring quality

Active Publication Date: 2016-08-24
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the prior art, during the KR desulfurization pretreatment process of molten iron, the KR desulfurization secondary dedusting ash containing desulfurizing agent dust, carbon and iron oxide precipitated in molten iron will be collected by dust hood and bag filter, and then The KR desulfurization secondary dust removal treatment reduces the recycling rate and causes pollution to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1 of the present invention proposes a method of utilizing KR desulfurization secondary dedusting to carry out molten iron smelting. The specific process of the method is as follows:

[0022] Step 1: Obtain KR desulfurization secondary dust removal ash, wherein, the KR desulfurization secondary dust removal ash is the solid recovery including desulfurization agent dust, carbon precipitated in molten iron and iron oxide collected during the desulfurization pretreatment process of molten iron by KR things.

[0023] In the specific implementation process, take the smelting of a 300-ton top-bottom combined blowing converter as an example, that is, the characterization of molten iron is 300 tons. The KR desulfurization secondary dedusting ash of desulfurizer dust, carbon precipitated in molten iron and iron oxide, wherein the KR desulfurization secondary dedusting ash includes CaO with a content of 40% to 60%, and a content of 5% to 15%. CaF2 with a content of 1% ...

Embodiment 2

[0034] Embodiment 2 of the present invention proposes a method of utilizing KR desulfurization secondary dedusting to carry out molten iron smelting. The specific process of the method is as follows:

[0035] Step 1: Obtain KR desulfurization secondary dust removal ash, wherein, the KR desulfurization secondary dust removal ash is the solid recovery including desulfurization agent dust, carbon precipitated in molten iron and iron oxide collected during the desulfurization pretreatment process of molten iron by KR things.

[0036] In the specific implementation process, take the smelting of a 300-ton top-bottom combined blowing converter as an example, that is, the characterization of molten iron is 300 tons. The KR desulfurization secondary dedusting ash of desulfurizer dust, carbon precipitated in molten iron and iron oxide, wherein the KR desulfurization secondary dedusting ash includes CaO with a content of 40% to 60%, and a content of 5% to 15%. CaF2 with a content of 1% ...

Embodiment 3

[0047] Embodiment 3 of the present invention proposes a method of utilizing KR desulfurization secondary dedusting to carry out molten iron smelting. The specific process of the method is as follows:

[0048] Step 1: Obtain KR desulfurization secondary dust removal ash, wherein, the KR desulfurization secondary dust removal ash is the solid recovery including desulfurization agent dust, carbon precipitated in molten iron and iron oxide collected during the desulfurization pretreatment process of molten iron by KR things.

[0049] In the specific implementation process, take the smelting of a 300-ton top-bottom combined blowing converter as an example, that is, the characterization of molten iron is 300 tons. The KR desulfurization secondary dedusting ash of desulfurizer dust, carbon precipitated in molten iron and iron oxide, wherein the KR desulfurization secondary dedusting ash includes CaO with a content of 40% to 60%, and a content of 5% to 15%. CaF2 with a content of 1% ...

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Abstract

The invention discloses a molten iron smelting method using KR desulfurization secondary dust removal ash. First, the KR desulfurization secondary dust removal ash is obtained, wherein the KR desulfurization secondary dust removal ash is collected during the desulfurization pretreatment process of molten iron by KR Including desulfurization agent dust, carbon precipitated in molten iron, and solid recovered iron oxide; then adding a desulfurization mixture of 6-17kg / t molten iron to the molten iron for desulfurization treatment, and performing deslagging treatment on the molten iron after desulfurization, wherein, The sulfur slag removal rate in the slag removal process is 95% to 99%, and the molten iron treated in step c is put into a converter for smelting, wherein the content of S in the molten steel after the converter smelting is 0.0010wt% ~0.0040 wt%.

Description

technical field [0001] The invention relates to the field of smelting, in particular to a method for smelting molten iron by using KR desulfurization secondary dust removal ash. Background technique [0002] With the continuous development of iron and steel smelting technology, the requirements for steel quality are getting higher and higher, so that the steel has a lower content of sulfur (S). In the prior art, during the pretreatment process of molten iron, KR is used for desulfurization pretreatment , so that the content of S in molten iron after KR desulfurization treatment can reach 0.0010wt% or less, and then pour the molten iron after KR treatment into a converter for smelting, thereby reducing the content of S in molten steel produced by converter smelting, Thereby improving the quality of steel. [0003] However, in the prior art, during the KR desulfurization pretreatment process of molten iron, the KR desulfurization secondary dedusting ash containing desulfurizi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C1/02
Inventor 陈虎赵长亮王飞王桂琴罗伯钢苏震霆田志红彭国仲吴耀春陈晓平
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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