CN104498673B - A kind of method utilizing hot metal pretreatment waste residue to carry out desulfurization - Google Patents
A kind of method utilizing hot metal pretreatment waste residue to carry out desulfurization Download PDFInfo
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- CN104498673B CN104498673B CN201510024779.5A CN201510024779A CN104498673B CN 104498673 B CN104498673 B CN 104498673B CN 201510024779 A CN201510024779 A CN 201510024779A CN 104498673 B CN104498673 B CN 104498673B
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- hot metal
- waste residue
- metal pretreatment
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- pretreatment waste
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The present invention relates to a kind of method utilizing hot metal pretreatment waste residue to carry out desulfurization.Its technical scheme is: first hot metal pretreatment waste residue is stacked 90 ~ 360 days naturally, then carries out magnetic separation, then is that 1 ︰ (0.01 ~ 0.7) mixes in mass ratio by the waste residue after magnetic separation and sweetening agent, obtains composite desulfurizing agent.Join in hot metal ladle by composite desulfurizing agent under 1250 ~ 1450 DEG C of conditions, the add-on of composite desulfurizing agent is 3 ~ 15wt% of molten iron in described hot metal ladle, mechanical stirring molten iron 0.01 ~ 10min, leaves standstill 20 ~ 40min.Described sweetening agent is made up of calcium oxide and Calcium Fluoride (Fluorspan), and the mass ratio of calcium oxide and Calcium Fluoride (Fluorspan) is 1 ︰ (0.01 ~ 0.25).Present invention process is simple, cost is low and environmental friendliness, utilizes hot metal pretreatment waste residue to carry out the efficiency of desulfurization high.
Description
Technical field
The invention belongs to hot metal pretreatment waste reside comprehensive utilization technical field.Particularly relate to a kind of method utilizing hot metal pretreatment waste residue to carry out desulfurization.
Background technology
In recent years, along with user improves constantly the requirement of steel quality, hot metal pretreatment is widely used in Iron and Steel Production as the outer treatment technology of a kind of main stove, thus causes producing a large amount of hot metal pretreatment waste residues in steel manufacture process.At present for the treatment process of hot metal pretreatment waste residue the most frequently used be for paving the way, but hot metal pretreatment waste residue is not only to environment and harmful, and causes great waste to main component CaO in hot metal pretreatment waste residue.Thus the problem that need solve is become to the process of hot metal pretreatment waste residue and comprehensive utilization.
Also have people that hot metal pretreatment waste residue is used for desulfurization at present, although achieve desulfurization slag desulfurization again, its weak point is for hot metal pretreatment waste residue utilization amount less, requires higher to molten iron temperature.
Summary of the invention
The present invention is intended to overcome prior art defect, object is to provide that a kind of technique is simple, cost is low and the eco-friendly method utilizing hot metal pretreatment waste residue to carry out desulfurization, the method can not only realize the recovery to molten iron pretreatment slag, and high to the desulfuration efficiency of molten iron.
For achieving the above object, the technical solution used in the present invention is: it is characterized in that the concrete steps of described method are:
Step one, first hot metal pretreatment waste residue is stacked 90 ~ 360 days naturally, then carry out magnetic separation, then be that 1 ︰ (0.01 ~ 0.7) mixes in mass ratio by the waste residue after magnetic separation and sweetening agent, obtain composite desulfurizing agent.
Step 2, join in hot metal ladle by composite desulfurizing agent under 1250 ~ 1450 DEG C of conditions, the add-on of composite desulfurizing agent is 3 ~ 15wt% of molten iron in described hot metal ladle, mechanical stirring molten iron 0.01 ~ 10min, leaves standstill 20 ~ 40min.
Chemical composition and the content thereof of described hot metal pretreatment waste residue are: SiO
2be 8 ~ 12wt%, Al
2o
3be 0.1 ~ 1wt%, CaO be 53 ~ 66wt%, Fe
2o
3be 15 ~ 20wt%, MgO be 0.5 ~ 2.5wt%, MnO be 0.01 ~ 1wt%, S be 2 ~ 3wt%, CaF
2be 2 ~ 8wt%.
Described sweetening agent is made up of calcium oxide and Calcium Fluoride (Fluorspan), and the mass ratio of calcium oxide and Calcium Fluoride (Fluorspan) is 1 ︰ (0.01 ~ 0.25).
Owing to adopting technique scheme, the present invention compared with prior art, has following positively effect:
The invention provides a kind of method utilizing hot metal pretreatment waste residue to carry out desulfurization, the method first by hot metal pretreatment waste residue through natural stacking, again magnetic separation is carried out to hot metal pretreatment waste residue, waste residue in hot metal pretreatment waste residue is separated with abrasive grit, then the waste residue after magnetic separation and desulphurizer mixing is even, namely can be used to carry out desulfurization to molten iron.Not only technique is simple and cost is low in the present invention, and can realize, to a large amount of hot metal pretreatment waste residues recycling, being conducive to comprehensive utilization of resources, reducing and stack and environmental pollution.
Effective element in energy Appropriate application hot metal pretreatment waste residue of the present invention, prepared composite desulfurizing agent is applicable to the molten iron of most of kind, and desulfurization degree is 20 ~ 40%.
Therefore, present invention process is simple, cost is low and environmental friendliness, utilizes hot metal pretreatment waste residue to carry out the efficiency of desulfurization high.
Embodiment
Below in conjunction with embodiment, the invention will be further described, the restriction not to its protection domain:
For avoiding repetition, first by the chemical composition of the hot metal pretreatment waste residue in this embodiment and content Unify legislation as follows, repeat no more in embodiment.
Chemical composition and the content thereof of described hot metal pretreatment waste residue are: SiO
2be 8 ~ 12wt%, Al
2o
3be 0.1 ~ 1wt%, CaO be 53 ~ 66wt%, Fe
2o
3be 15 ~ 20wt%, MgO be 0.5 ~ 2.5wt%, MnO be 0.01 ~ 1wt%, S be 2 ~ 3wt%, CaF
2be 2 ~ 8wt%.
Embodiment 1
A kind of method utilizing hot metal pretreatment waste residue to carry out desulfurization.The concrete steps of described method are:
Step one, first hot metal pretreatment waste residue is stacked 90 ~ 180 days naturally, then carry out magnetic separation, then be that 1 ︰ (0.01 ~ 0.30) mixes in mass ratio by the waste residue after magnetic separation and sweetening agent, obtain composite desulfurizing agent.
Step 2, join in hot metal ladle by composite desulfurizing agent under 1250 ~ 1350 DEG C of conditions, the add-on of composite desulfurizing agent is 3 ~ 11wt% of molten iron in described hot metal ladle, mechanical stirring molten iron 0.01 ~ 5min, leaves standstill 20 ~ 30min.
Described sweetening agent is made up of calcium oxide and Calcium Fluoride (Fluorspan), and the mass ratio of calcium oxide and Calcium Fluoride (Fluorspan) is 1 ︰ (0.01 ~ 0.15).
Adopt the obtained composite desulfurizing agent of the present embodiment to carry out desulfurizing iron, desulfurization degree is 20 ~ 30%.
Embodiment 2
A kind of method utilizing hot metal pretreatment waste residue to carry out desulfurization.The concrete steps of described method are:
Step one, first hot metal pretreatment waste residue is stacked 180 ~ 270 days naturally, then carry out magnetic separation, then be that 1 ︰ (0.4 ~ 0.7) mixes in mass ratio by the waste residue after magnetic separation and sweetening agent, obtain composite desulfurizing agent.
Step 2, join in hot metal ladle by composite desulfurizing agent under 1290 ~ 1380 DEG C of conditions, the add-on of composite desulfurizing agent is 7 ~ 15wt% of molten iron in described hot metal ladle, mechanical stirring molten iron 2 ~ 7min, leaves standstill 30 ~ 40min.
Described sweetening agent is made up of calcium oxide and Calcium Fluoride (Fluorspan), and the mass ratio of calcium oxide and Calcium Fluoride (Fluorspan) is 1 ︰ (0.05 ~ 0.20).
Adopt the obtained composite desulfurizing agent of the present embodiment to carry out desulfurizing iron, desulfurization degree is 22 ~ 35%.
Embodiment 3
A kind of method utilizing hot metal pretreatment waste residue to carry out desulfurization.The concrete steps of described method are:
Step one, first hot metal pretreatment waste residue is stacked 270 ~ 360 days naturally, then carry out magnetic separation, then be that 1 ︰ (0.1 ~ 0.5) mixes in mass ratio by the waste residue after magnetic separation and sweetening agent, obtain composite desulfurizing agent.
Step 2, join in hot metal ladle by composite desulfurizing agent under 1340 ~ 1450 DEG C of conditions, the add-on of composite desulfurizing agent is 5 ~ 12wt% of molten iron in described hot metal ladle, mechanical stirring molten iron 4 ~ 10min, leaves standstill 25 ~ 35min.
Described sweetening agent is made up of calcium oxide and Calcium Fluoride (Fluorspan), and the mass ratio of calcium oxide and Calcium Fluoride (Fluorspan) is 1 ︰ (0.10 ~ 0.25).
Adopt the obtained composite desulfurizing agent of the present embodiment to carry out desulfurizing iron, desulfurization degree is 25 ~ 40%.
This embodiment compared with prior art, has following positively effect:
This embodiment provides a kind of method utilizing hot metal pretreatment waste residue to carry out desulfurization, the method first by hot metal pretreatment waste residue through natural stacking, again magnetic separation is carried out to hot metal pretreatment waste residue, waste residue in hot metal pretreatment waste residue is separated with abrasive grit, then the waste residue after magnetic separation and desulphurizer mixing is even, namely can be used to carry out Ah's desulfurization to molten iron.Not only technique is simple and cost is low for this embodiment, and can realize, to a large amount of hot metal pretreatment waste residues recycling, being conducive to comprehensive utilization of resources, reducing and stack and environmental pollution.
Effective element in this embodiment energy Appropriate application hot metal pretreatment waste residue, prepared composite desulfurizing agent is applicable to the molten iron of most of kind, and desulfurization degree reaches 20 ~ 40%.
Therefore, this embodiment technique is simple, cost is low and environmental friendliness, utilizes hot metal pretreatment waste residue to carry out the efficiency of desulfurization high.
Claims (1)
1. utilize hot metal pretreatment waste residue to carry out a method for desulfurizing iron, it is characterized in that the concrete steps of described method are:
Step one, first hot metal pretreatment waste residue is stacked 90 ~ 360 days naturally, then carry out magnetic separation, then be that 1 ︰ (0.01 ~ 0.7) mixes in mass ratio by the waste residue after magnetic separation and sweetening agent, obtained composite desulfurizing agent;
Step 2, join in hot metal ladle by composite desulfurizing agent under 1250 ~ 1450 DEG C of conditions, the add-on of composite desulfurizing agent is 3 ~ 15wt% of molten iron in described hot metal ladle, mechanical stirring molten iron 0.01 ~ 10min, leaves standstill 20 ~ 40min;
Chemical composition and the content thereof of described hot metal pretreatment waste residue are: SiO
2be 8 ~ 12wt%, Al
2o
3be 0.1 ~ 1wt%, CaO be 53 ~ 66wt%, Fe
2o
3be 15 ~ 20wt%, MgO be 0.5 ~ 2.5wt%, MnO be 0.01 ~ 1wt%, S be 2 ~ 3wt%, CaF
2be 2 ~ 8wt%;
Described sweetening agent is made up of calcium oxide and Calcium Fluoride (Fluorspan), and the mass ratio of calcium oxide and Calcium Fluoride (Fluorspan) is 1 ︰ (0.01 ~ 0.25).
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| CN201510024779.5A CN104498673B (en) | 2015-01-19 | 2015-01-19 | A kind of method utilizing hot metal pretreatment waste residue to carry out desulfurization |
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| CN201510024779.5A CN104498673B (en) | 2015-01-19 | 2015-01-19 | A kind of method utilizing hot metal pretreatment waste residue to carry out desulfurization |
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| CN104498673B true CN104498673B (en) | 2016-03-30 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1110713A (en) * | 1995-03-25 | 1995-10-25 | 柳州市东风化工厂 | Mixed sweetening agent |
| CN101649371A (en) * | 2009-08-26 | 2010-02-17 | 武汉科技大学 | Desulfurating agent for out-of-furnace treatment and preparation method thereof |
| CN102732679A (en) * | 2012-06-18 | 2012-10-17 | 莱芜钢铁集团有限公司 | Composited desulfurizer for KR, preparation method and application thereof |
| CN103738988A (en) * | 2013-12-26 | 2014-04-23 | 张延大 | Method for preparing slagging desulfurizing agent by utilizing industrial waste residue resource |
-
2015
- 2015-01-19 CN CN201510024779.5A patent/CN104498673B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1110713A (en) * | 1995-03-25 | 1995-10-25 | 柳州市东风化工厂 | Mixed sweetening agent |
| CN101649371A (en) * | 2009-08-26 | 2010-02-17 | 武汉科技大学 | Desulfurating agent for out-of-furnace treatment and preparation method thereof |
| CN102732679A (en) * | 2012-06-18 | 2012-10-17 | 莱芜钢铁集团有限公司 | Composited desulfurizer for KR, preparation method and application thereof |
| CN103738988A (en) * | 2013-12-26 | 2014-04-23 | 张延大 | Method for preparing slagging desulfurizing agent by utilizing industrial waste residue resource |
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