CN104762441B - Niobium-containing slag dephosphorization method - Google Patents
Niobium-containing slag dephosphorization method Download PDFInfo
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- CN104762441B CN104762441B CN201510160132.5A CN201510160132A CN104762441B CN 104762441 B CN104762441 B CN 104762441B CN 201510160132 A CN201510160132 A CN 201510160132A CN 104762441 B CN104762441 B CN 104762441B
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Abstract
The invention provides a niobium-containing slag dephosphorization method. The method comprises the following steps: adding the niobium-containing slag into molten iron prepared of pig iron; stirring; and collecting niobium-containing slag on the surface of the molten iron to obtain niobium-enriched slag. The temperature of the molten iron is 1350 DEG C to 1600 DEG C. With the method provided by the invention, niobium-enriched slag with substantially reduced phosphorus content is obtained, wherein the phosphorus content is substantially lower than 1.5%; and the ratio of Nb to P is greatly improved, wherein Nb/P is maintained at 20% or above. Therefore, the niobium-enriched slag can be used for smelting niobium-containing steel by direct alloying of molten steel; the application range of the niobium-containing slag is expanded and the smelting cost of niobium-containing steel is reduced.
Description
Technical field
The invention belongs to metallurgical engineering field is and in particular to the method for the dephosphorization of slag containing niobium.
Background technology
Baogang of China baiyuneboite is rich in the resource such as ferrum, rare earth, niobium, and its middle rare earth reserves ranks first in the world, the storage of niobium
Amount accounts for more than the 90% of national reserves, occupies the second in the world, because the niobium grade in baiyuneboite is low, niobium resource and other mineral
Close symbiosis, mineral structure is complicated, disseminated grain size is thin it is difficult to separate, and ore dressing and smelting difficulty are very big.With Bayan Obo rare earth
Ore deposit and the continuous exploitation of iron mine, niobium mineral is partly in iron mine, is partly into mine tailing.Niobium in entrance iron mine is through blast furnace
Smelting becomes niobium bearing hot metal, and content of niobium is 0.01～1% about, and the main method recycling niobium in molten iron is niobium bearing hot metal warp
Desiliconization, carry niobium, niobium slag alloying is smelted for ferro-niobium；Due to nb/p < 1 in niobium slag, phosphorus content height is it is impossible to be used for making steel, Zhi Nengyong
In smelting rudimentary ferro-niobium, and these ferro-niobiums can only be added in cast iron, smelt columbium containing alloy cast iron it is impossible to as ferrocolumbium plus
Enter in molten steel, thus limiting the range containing niobium slag.Therefore, study a kind of method of the dephosphorization of slag containing niobium, reduce slag containing niobium
In phosphorus content, make slag containing niobium be used not only for smelting rudimentary ferro-niobium, also can be added to steel as the material of DIRECT ALLOYING
In liquid, smelt steel containing niobium, for the smelting cost reducing containing niobium steel, the economic benefit increasing containing niobium steel smelting is significant.
Content of the invention
The invention provides the method for the dephosphorization of slag containing niobium, methods described includes: slag containing niobium is added the ferrum being produced by the pig iron
Water；Stirring；Collect the slag containing niobium on the surface of described molten iron, obtain rich niobium slag.
In the above-mentioned methods, wherein, described cinder ladle containing niobium is added to include the surface that described slag containing niobium is added to described molten iron
On.
In the above-mentioned methods, wherein, described cinder ladle containing niobium is added to include the powder body injection of described 0～0.1mm containing niobium slag
Enter in described molten iron, and the carrier using is nitrogen or argon.
In the above-mentioned methods, wherein, described cinder ladle containing niobium is added to include the powder body of described 0～0.1mm containing niobium slag and Jiao
The mixture of powdered carbon is blown in described molten iron, and the carrier using is nitrogen or argon.
In the above-mentioned methods, wherein, described cinder ladle containing niobium is added to include the powder body of described 0～0.1mm containing niobium slag and Jiao
The mixture of powdered carbon adds the surface of described molten iron.
In the above-mentioned methods, wherein, the temperature of described molten iron is 1350 DEG C to 1600 DEG C.
In the above-mentioned methods, wherein, in the described pig iron, c content is 4% to 5%, si < 0.1%, mn < 0.1%, p <
0.04%, s < 0.015%.
In the above-mentioned methods, wherein, in described slag containing niobium, nb2o5Content between 3.45% to 4.82%, p2o5
Content between 13.56% to 19.7%, the content of mno between 13.7% to 15.6%, sio2Content 21.3% to
Between 27.1%.
In the above-mentioned methods, wherein, the time of described stirring is 20 minutes to 50 minutes.
In the above-mentioned methods, wherein, the described powder body containing niobium slag and the mixed proportion of described coke blacking are 1:3.
The dephosphorization method being provided by the present invention, has obtained the rich niobium slag that phosphorus content substantially reduces, and phosphorus content is essentially little
In 1.5%, and substantially increase the ratio of nb and p, nb/p is maintained at more than 20%.This makes rich niobium slag can be used in molten steel
DIRECT ALLOYING, to smelt steel containing niobium, improves the range of application of niobium slag, reduces the smelting cost containing niobium steel simultaneously.
Specific embodiment
The following examples can make those skilled in the art that the present invention is more fully understood, but limits never in any form
The present invention.
Embodiment 1
In smelting furnace, the 100kg pig iron is melted and is warmed up to 1400 DEG C, the composition of the pig iron is: c:4.3%, si:0.05%,
Mn:0.08%, p:0.008%, s:0.005%, remaining is ferrum；Add 10kg slag containing niobium on molten iron surface, and be stirred, contain
Niobium slag stays the p in molten iron surface, slag containing niobium because density is little2o5React with the c in molten iron, make the phosphorus in slag containing niobium
Hydrochlorate is reduced by the carbon in molten iron, generates p and stays in molten iron, for example, react meo 〃 p2o5+ 3c=meo+2p+co2+
2co, Slow cooling after 30 points of stirring, so that the slag containing niobium on molten iron surface is crusted and solidify, thus being easy to collect and stacking, collection obtains
Rich niobium slag.Main component in niobium slag is fe, sio2、mno、p2o5、nb2o5, the present invention divided by chemical solution sample ict measuring method
The content of each composition in analysis slag containing niobium and rich niobium slag, because chemical solution sample ict measuring method is well-known in the art,
This no longer describes in detail, in addition to the method that the present invention uses, it is possible to use spectrographic method well known in the art.Slag containing niobium and rich niobium
The composition of slag see table 1.
Table 1 slag containing niobium and the composition (m%) of rich niobium slag
| Sequence number | tfe | sio2 | mno | p2o5 | nb2o5 | nb/p |
| Slag containing niobium | 33.5 | 27.1 | 14.2 | 16.8 | 3.45 | 0.33 |
| Rich niobium slag | 1.0 | 33.3 | 20.4 | 1.35 | 16.98 | 20.12 |
Note: in rich niobium slag ferrum with the presence of with ferrum, with the presence of with forms such as feo, disregard oxygen content in component analyses, only
Meter tfe content.
Embodiment 2
In smelting furnace, the 100kg pig iron is melted and is warmed up to 1520 DEG C, the composition of the pig iron is: c:5.0%, si:0.08%,
Mn:0.1%, p:0.04%, s:0.015%, remaining is ferrum；20kg slag containing niobium is broken for the powder body of below 0.1mm, with nitrogen
Or argon will contain niobium ground-slag for carrier spray gun and be blown in molten iron, and it is stirred, Slow cooling after 20 points of stirring, make molten iron
The crust solidification of slag containing niobium on surface, collects and obtains rich niobium slag.The content of each composition in analysis slag containing niobium and rich niobium slag, slag containing niobium
Composition with rich niobium slag is table 2 below.
Table 2 slag containing niobium and the composition (m%) of rich niobium slag
| Sequence number | tfe | sio2 | mno | p2o5 | nb2o5 | nb/p |
| Slag containing niobium | 32.2 | 21.3 | 13.7 | 19.7 | 4.82 | 0.39 |
| Rich niobium slag | 1.2 | 35.7 | 24.9 | 1.1 | 17.64 | 25.66 |
Embodiment 3
30kg slag containing niobium is broken for the powder that granularity is 0～0.1mm mix with 90kg coke blacking, mixed proportion is 1:3
(weight ratio) load in injection tank, with nitrogen or argon as carrier, the mixture of ground-slag containing niobium and coke blacking is blown into
In the molten iron that the 100kg pig iron is formed.The composition of molten iron is: c:4.0%, si:0.009%, mn:0.08%, p:0.0085%, s:
0.00094%, remaining is ferrum, and molten iron temperature is 1600 DEG C, and stirs 40 minutes, Slow cooling, makes the slag containing niobium on molten iron surface
Crust solidification, collects ironing surface slag containing niobium and obtains rich niobium slag.The content of each composition in analysis slag containing niobium and rich niobium slag, containing niobium
The composition of slag and rich niobium slag is table 3 below.
Table 3 slag containing niobium and the composition (m%) of rich niobium slag
| Sequence number | tfe | sio2 | mno | p2o5 | nb2o5 | nb/p |
| Slag containing niobium | 25.52 | 24.18 | 15.6 | 13.56 | 3.57 | 0.42 |
| Rich niobium slag | 1.5 | 32.57 | 21.85 | 1.09 | 15.78 | 23.16 |
Embodiment 4
30kg slag containing niobium is broken for the powder that granularity is 0～0.1mm mix with 90kg coke blacking, mixed proportion is 1:3
(weight ratio), the mixture of ground-slag containing niobium and coke blacking is added the molten iron surface of 100kg pig iron formation.The composition of molten iron is:
C:4.0%, si:0.009%, mn:0.08%, p:0.0085%, s:0.00094%, remaining is ferrum, and molten iron temperature is 1350
DEG C, and stir 50 minutes, Slow cooling, so that the slag containing niobium on molten iron surface is crusted and solidify, collect ironing surface slag containing niobium and obtain richness
Niobium slag.The content of each composition in analysis slag containing niobium and rich niobium slag, the composition of slag containing niobium and rich niobium slag is table 3 below.
Table 4 slag containing niobium and the composition (m%) of rich niobium slag
| Sequence number | tfe | sio2 | mno | p2o5 | nb2o5 | nb/p |
| Slag containing niobium | 25.52 | 24.18 | 15.6 | 13.56 | 3.57 | 0.42 |
| Rich niobium slag | 1.9 | 35.1 | 23.3 | 1.25 | 17.1 | 21.82 |
From the foregoing, it will be observed that the method for the dephosphorization of slag containing niobium being provided by the present invention is it will be apparent that reduce the phosphorus content in niobium slag,
Phosphorus content is controlled to substantially less than 1.5%, and substantially increases the ratio of nb and p, and nb/p is maintained at more than 20%.This makes
Rich niobium slag can be used in the alloying of niobium steel, improves the range of application of niobium slag, reduces the smelting cost containing niobium steel simultaneously.
It will be understood by those skilled in the art that above example is only exemplary embodiment, in the spirit without departing substantially from the present invention
In the case of scope, multiple changes, replacement and change can be carried out.
Claims (9)
1. a kind of method of the dephosphorization of slag containing niobium, comprising:
The molten iron that the addition of slag containing niobium that niobium bearing hot metal is proposed niobium generation is produced by the pig iron；
Stirring；
Collect the slag containing niobium on the surface of described molten iron, obtain rich niobium slag, wherein, add described cinder ladle containing niobium to include described slag containing niobium
The powder body of 0～0.1mm be blown in described molten iron, and the carrier using is nitrogen or argon.
2. method according to claim 1, wherein, adds described cinder ladle containing niobium to include and described slag containing niobium is added to described ferrum
On the surface of water.
3. method according to claim 1, wherein, adds described cinder ladle containing niobium to include described 0～0.1mm's containing niobium slag
Powder body is blown in described molten iron with the mixture of coke blacking, and the carrier using is nitrogen or argon.
4. method according to claim 1, wherein, adds described cinder ladle containing niobium to include described 0～0.1mm's containing niobium slag
The mixture of powder body and coke blacking adds the surface of described molten iron.
5. method according to claim 1, wherein, the temperature of described molten iron is 1350 DEG C to 1600 DEG C.
6. method according to claim 1, wherein, in the described pig iron, c content is 4% to 5%, si < 0.1%, mn <
0.1%, p < 0.04%, s < 0.015%.
7. method according to claim 1, wherein, in described slag containing niobium, nb2o5Content 3.45% to 4.82%
Between, p2o5Content between 13.56% to 19.7%, the content of mno between 13.7% to 15.6%, sio2Content
Between 21.3% to 27.1%.
8. method according to claim 1, wherein, the time of described stirring is 20 minutes to 50 minutes.
9. the method according to claim 3 or 4, wherein, the mixed proportion of the described powder body containing niobium slag and described coke blacking
For 1:3.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3721727A (en) * | 1971-09-09 | 1973-03-20 | Kawecki Berylco Ind | Electric furnace method of beneficiating tantalum-and noibium-containing tin slags and the like |
| CN101157961A (en) * | 2007-11-06 | 2008-04-09 | 东北大学 | Preparation method for producing low-grade ferroniobium by using ferroniobium concentrate |
| CN103993162A (en) * | 2014-05-21 | 2014-08-20 | 包头稀土研究院 | Method for removing iron and phosphorus of high phosphorus ferroniobium concentrate |
-
2015
- 2015-04-07 CN CN201510160132.5A patent/CN104762441B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3721727A (en) * | 1971-09-09 | 1973-03-20 | Kawecki Berylco Ind | Electric furnace method of beneficiating tantalum-and noibium-containing tin slags and the like |
| CN101157961A (en) * | 2007-11-06 | 2008-04-09 | 东北大学 | Preparation method for producing low-grade ferroniobium by using ferroniobium concentrate |
| CN103993162A (en) * | 2014-05-21 | 2014-08-20 | 包头稀土研究院 | Method for removing iron and phosphorus of high phosphorus ferroniobium concentrate |
Non-Patent Citations (1)
| Title |
|---|
| 含铌渣与钢液的冶金热力学平衡研究;姜银举 等;《内蒙古科技大学学报》;20100930;第29卷(第3期);第207-209页 * |
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