CN105734202A - Pretreatment technique for molten iron - Google Patents
Pretreatment technique for molten iron Download PDFInfo
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- CN105734202A CN105734202A CN201410744737.4A CN201410744737A CN105734202A CN 105734202 A CN105734202 A CN 105734202A CN 201410744737 A CN201410744737 A CN 201410744737A CN 105734202 A CN105734202 A CN 105734202A
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- desulfurizing agent
- molten iron
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- nitrogen
- pretreatment technique
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a pretreatment technique for molten iron. The pretreatment technique is characterized in that according to desulfuration technological parameters, Mg and CaO serve as a desulfurizing agent, and the flow of Mg powder in the desulfurizing agent is 12 kg/min; the flow of CaO in the desulfurizing agent is 5 kg/min; the consumption amount of Mg in the desulfurizing agent is 0.65 kg/t, and the consumption amount of lime in the desulfurizing agent is 1.92 kg/t; the temperature fluctuation of the molten iron ranges from 1250 DEG C to 1300 DEG C; the sulfur content in the molten iron is 0.02-0.035%, and the average content of 40 furnaces is 0.022%; the nitrogen pressure is 0.15-0.2 Mpa, and the nitrogen flow is 150-200 M<3>/min; the injection velocity of the desulfurizing agent is 40-60 kg/min, the injection time is 10-25 min; and the consumption amount of the desulfurizing agent is 2.5-4.5 kg/t, and the average use amount is 5.5 kg/t. By the adoption of the pretreatment technique for the molten iron, the desulfurization technology capability can be improved, and the product quality is improved.
Description
Technical field
The invention belongs to casting technique field, specifically a kind of hot metal pretreatment technology.
Background technology
Hot metal pretreatment technology is particularly important to modern steel mill, from being initially the demand meeting smelting low-sulfur or ultra-low sulphur steel kind, develop into ironmaking-steel-making-process of setting and optimize indivisible important step, particular with special converter desiliconization, the exploitation of dephosphorization technology technology and progress, forming a kind of full dose molten iron and carrying out the advanced technologies of " three take off " pretreatment.New generation steel plant should courageously adopt full dose liquid iron pre-treatments technique, to set up the clean steel production technology platform of high efficiency, low cost, strengthen product competitiveness, accelerate mammoth conveter rhythm, improve production efficiency, to realize compact, efficient, energy-conservation circular-type economy developmental pattern.The selection of molten iron pretreatment needs to consider the factors such as effect, cost, efficiency.In view of the defect that existing technique is deposited, in order to ensure product quality, it is necessary to be further improved.
Summary of the invention
In view of the deficiency that prior art exists, it is an object of the invention to provide a kind of hot metal pretreatment technology, sulfur removal technology can be improved, improve product quality.
A kind of hot metal pretreatment technology, it is characterised in that sulfur removal technology parameter is as follows: (1) desulfurizing agent adopts Mg to add CaO, desulfurizing agent flow Mg powder 12kg/min；CaO5kg/min；Sorbent consumption Mg0.65kg/t；Calx 1.92kg/t；Temperature drop 20 DEG C；Molten iron temperature fluctuates at 1250 DEG C-1300 DEG C；Molten iron sulfur-bearing 0.02%-0.035%, the average content of 40 stoves is 0.022%, carrier conveying is done with nitrogen, nitrogen pressure is 0.15-0.2Mpa, nitrogen flow is 150-200M3/min, and desulfurizing agent injecting velocity is 40-60kg/min, and jet time 10-25min, desulfurizing agent consumption is 2.5-4.5kg/t, average dose 5.5kg/t.
A kind of hot metal pretreatment technology of the present invention is through desulfurization at a relatively high temperature; Na2CO3 desulphurization reaction is the endothermic reaction; high temperature is more beneficial for the thermodynamic requirement of Na2CO3 desulphurization reaction; thus improving the activity of Sulfur Content in Hot Iron; promote the carrying out of Na2CO3 desulphurization reaction; active lime has been carried out purification by this technique desulfurizing agent and protection processes, and adds mobility, and its resultant effect improves the level of CaC2 desulfurizing agent.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described, and its operating procedure is as follows:
A kind of hot metal pretreatment technology, sulfur removal technology parameter is as follows: (1) desulfurizing agent adopts Mg to add CaO, desulfurizing agent flow Mg powder 12kg/min；CaO5kg/min；Sorbent consumption Mg0.65kg/t；Calx 1.92kg/t；Temperature drop 20 DEG C；Molten iron temperature fluctuates at 1250 DEG C-1300 DEG C；Molten iron sulfur-bearing 0.02%-0.035%, the average content of 40 stoves is 0.022%, carrier conveying is done with nitrogen, nitrogen pressure is 0.15-0.2Mpa, nitrogen flow is 150-200M3/min, and desulfurizing agent injecting velocity is 40-60kg/min, and jet time 10-25min, desulfurizing agent consumption is 2.5-4.5kg/t, average dose 5.5kg/t.
The preferred embodiment of the present invention described in detail above.It is to be understood that those of ordinary skill in the art just can make many modifications and variations according to the design of the present invention without creative work.Therefore, all technical staff in the art are under this invention's idea on the basis of existing technology by logic minute analysis, reasoning or the available technical scheme of limited experiment, the protection domain being all defined in the patent claims.
Claims (1)
1. a hot metal pretreatment technology, it is characterised in that sulfur removal technology parameter is as follows: desulfurizing agent adopts Mg to add CaO, desulfurizing agent flow Mg powder 12kg/min；CaO5kg/min；Sorbent consumption Mg0.65kg/t；Calx 1.92kg/t；Temperature drop 20 DEG C；Molten iron temperature fluctuates at 1250 DEG C-1300 DEG C；Molten iron sulfur-bearing 0.02%-0.035%, the average content of 40 stoves is 0.022%, carrier conveying is done with nitrogen, nitrogen pressure is 0.15-0.2Mpa, nitrogen flow is 150-200M3/min, and desulfurizing agent injecting velocity is 40-60kg/min, and jet time 10-25min, desulfurizing agent consumption is 2.5-4.5kg/t, average dose 5.5kg/t.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410744737.4A CN105734202A (en) | 2014-12-09 | 2014-12-09 | Pretreatment technique for molten iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410744737.4A CN105734202A (en) | 2014-12-09 | 2014-12-09 | Pretreatment technique for molten iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105734202A true CN105734202A (en) | 2016-07-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201410744737.4A Pending CN105734202A (en) | 2014-12-09 | 2014-12-09 | Pretreatment technique for molten iron |
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| CN (1) | CN105734202A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106591529A (en) * | 2016-11-28 | 2017-04-26 | 河钢股份有限公司承德分公司 | Ultra-low sulfur control method for hot metal pretreatment |
| CN107828931A (en) * | 2017-11-02 | 2018-03-23 | 马鞍山钢铁股份有限公司 | A kind of blowing process molten iron pre-desulfurization technique for not having to fluidization lime and passivated magnesium |
-
2014
- 2014-12-09 CN CN201410744737.4A patent/CN105734202A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106591529A (en) * | 2016-11-28 | 2017-04-26 | 河钢股份有限公司承德分公司 | Ultra-low sulfur control method for hot metal pretreatment |
| CN107828931A (en) * | 2017-11-02 | 2018-03-23 | 马鞍山钢铁股份有限公司 | A kind of blowing process molten iron pre-desulfurization technique for not having to fluidization lime and passivated magnesium |
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Legal Events
| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160706 |