CN103911561A - Low-phosphorus low-sulphur nickel-containing pig iron and its preparation method - Google Patents
Low-phosphorus low-sulphur nickel-containing pig iron and its preparation method Download PDFInfo
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- CN103911561A CN103911561A CN201310007226.XA CN201310007226A CN103911561A CN 103911561 A CN103911561 A CN 103911561A CN 201310007226 A CN201310007226 A CN 201310007226A CN 103911561 A CN103911561 A CN 103911561A
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Abstract
The invention provides low phosphorus low-sulphur nickel-containing pig iron comprising less than 4.5% of C, 4.0-9.0% of Ni, less than 0.05% of S, less than 0.05% of P, less than 0.2% of impurity elements and the balance of Fe. The invention also provides a preparation method of the low phosphorus low-sulphur nickel-containing pig iron by use of a low grade nickel ore, and the method includes ore separation, crushing and sintering of the nickel ore, crude smelting in a blast furnace, refining in an electric arc furnace and other steps.
Description
Technical field
The present invention relates to a kind of nickel-contained pig iron and manufacture method thereof of low-phosphorous, low-sulfur
Background technology
Nickel is the important alloying element in steel, in a lot of structure iron and most of stainless steel, all contains nickel.China has now become Chan Gang big country, and production capacity has exceeded 700,000,000 tons/year, will consume every year a large amount of nickel.But China is again the country of a poor nickel, a large amount of nickel of import of therefore having to every year.Along with the rise of international nickel valency in recent years, bring huge cost pressure to Chinese iron and steel enterprise.
People are devoted to seek the substitute of nickel always for many years, but not yet succeed so far; Utilize the nickel Tu Kuang in native country as nickel source, because of the on the low side and contained detrimental impurity of its grade, as, phosphorus, sulphur etc. are too high, will increase the homework burden of steel making working procedure with the nickel product that this kind of nickel source produces, thereby limit the utilization in the nickel sources such as nickel Tu Kuang.
The object of the present invention is to provide nickel-contained pig iron of a kind of low-phosphorous, low-sulfur and preparation method thereof to address the above problem.
Summary of the invention
The invention provides a kind of nickel-contained pig iron of low-phosphorous, low-sulfur, it consists of (by weight percentage): C<4.5%, Ni, 4.0～9.0%, S < 0.05%, P < 0.05%, impurity element < 0.2%, remaining is Fe.
The present invention also provides the manufacture method of the nickel-contained pig iron of described low-phosphorous, low-sulfur: its processing step is,
Nickel oxide ore and/or nickeliferous sulfate slag, through ore dressing or after without ore dressing, are sintered into nickel agglomerate, are placed on the rough pig iron that in ordinary blast, reduction is refined nickeliferously;
The nickeliferous rough pig iron of gained is placed in to ordinary arc furnace and is refined into the nickel-contained pig iron of low-phosphorous, low-sulfur claimed in claim 1.
The contained chemical composition of nickel-contained pig iron low-phosphorous, low-sulfur that the present invention is above-mentioned, mainly has strict restriction to Ni, P wherein, the content of S.If Ni content is lower than 4.0%, without economic worth; But higher than 9.0%,, because of the restriction of raw material grade, conventionally do not reach.P, S are the harmful element in steel, must strict restriction.Described impurity element refers to the non-ferrous metal element such as the copper in nickel ores, chromium, cobalt with nickel symbiosis, and they are by any steel grade is not necessary, so should be limited to below 0.2% by ore dressing.In the time that its content is not high, can omit beneficiating process.
By the manufacture method of low-phosphorous low-sulfur nickel-contained pig iron of the present invention, can adopt nickel oxide ore, nickel sulfide ore, nickeliferous sulfate slag is nickel source.Through ore dressing or after without ore dressing, sinter above-mentioned raw materials into piece, then in conventional blast furnace, smelt into the rough pig iron of nickeliferous > 4%; Finally this rough pig iron is refined in conventional electric arc furnace to the nickel-contained pig iron of above-mentioned low-phosphorous, low-sulfur.
When the nickeliferous sulfate slag that derives from vitriol works is done to nickel source, preferably, by described nickeliferous sulfate slag fine grinding, making wherein granularity is that 200 object parts account for more than 60%, then it is carried out to gravity treatment and magnetic separation, to obtain nickeliferous sulfate slag concentrate, again nickeliferous sulfate slag concentrate is allocated in common fine iron breeze and mixed, granulation (ball) is carried out sintering (roasting) and is obtained ferronickel mixed sintering (agglomerates) ore deposit, joining ore deposit ratio by control makes it contain S < 0.1%, Ni > 4%, Fe > 55%, finally this mixed sintering (agglomerates) ore deposit is sloughed in conventional blast furnace to the sulphur content of part, thereby refine to obtain the rough pig iron of nickeliferous > 4%.
Drop in conventional electric arc furnace and carry out refining above-mentioned rough nickel-contained pig iron as unique metal charge, remove phosphorus, sulphur and carbon, finally obtain the nickel-contained pig iron of low-phosphorous, low-sulfur of the present invention.
Because the described rough pig iron is the unique metal charge in refinery practice of the present invention, thereby the melting period of this refining process is shorter, is only 1/3rd of conventional electric arc furnace melting period length.The rapid fusing at a lower temperature of the described rough pig iron, is conducive to the dephosphorization operation of the described rough pig iron.The molten bath boiling that produce because of decarburization oxidation period and the high alkalinity of reduction period, kinetics, the thermodynamic condition that suboxide iron reducing slag brings, be conducive to dephosphorization and the desulfurization of the described rough pig iron.
The invention has the advantages that: can utilize conventional nickel technique processed to be difficult to the low-grade nickel oxide ore utilizing, low-grade nickel sulfide ore, contain the low ore grade nickel ore resources such as horbachite.Although the rough pig iron is refined into nickel-contained pig iron low-phosphorous, low-sulfur through electric arc furnace, after it is cooling, use as steelmaking feed, see and seem unreasonable with regard to heat energy utilization angle, but by having utilized low-grade nickel source, than using metallic nickel, be still conducive to reduce containing the production cost of nickel steel.
Embodiment
Further illustrate the present invention below by embodiment.
Embodiment 1
Selecting nickel content is that the low-grade nickel sulfide ore of 0.5% left and right is nickel source.Obtain the nickel sulfide concentrate of sulphur < 35%, nickel > 0.6%, impurity element < 0.2% through ore dressing.Send vitriol works through boiling roaster (sulfur dioxide flue gas of its generation is sent to acid accumulator plant relieving haperacidity) in this concentrate, obtain the nickeliferous sulfate slag of sulfur-bearing 0.5～4%, be granularity that 200 object parts be greater than 60% with ball mill fine grinding to granularity by this nickeliferous sulphur slag, carry out again gravity treatment and magnetic separation (in the time of nickeliferous sulfate slag sulphur content < 0.1% can no longer through this ore dressing processing), result obtains sulfur-bearing < 0.1%, nickeliferous > 1%, the nickeliferous sulfate slag concentrate of iron content > 55%, again fine iron breeze and the coke powder solvent etc. of itself and equivalent are mixed, sintering, result obtains ferronickel mixed sintering ore deposit, this agglomerate is smelted in conventional blast furnace, result obtains rough nickel-contained pig iron.The nickel-contained pig iron of gained is dropped in electric arc furnace and carries out refining, refine to such an extent that nickel content is 4-9% left and right, phosphorus, sulphur content are not less than 0.05% low-phosphorous, low-sulfur nickel-contained pig iron.
Embodiment 2
After ore dressing, fragmentation, sinter nickel oxide ore into agglomerate.The agglomerate of gained is entered to blast-furnace smelting and become the nickeliferous rough pig iron that is greater than 4%.The above-mentioned rough pig iron of gained is entered to electric arc furnace refining as unique metal charge, and after sloughing carbon, p and s, obtaining nickel content is 4-9% left and right, and phosphorus, sulphur content are not less than 0.05% low-phosphorous, low-sulfur nickel-contained pig iron.
Claims (2)
1. the nickel-contained pig iron of low-phosphorous a, low-sulfur, it consists of (by weight percentage): C<4.5%, Ni, 4.0～9.0%, S < 0.05%, P < 0.05%, impurity element < 0.2%, remaining is Fe.
2. the manufacture method of the nickel-contained pig iron of low-phosphorous, low-sulfur claimed in claim 1: its processing step is,
Nickel oxide ore and/or nickeliferous sulfate slag, through ore dressing or after without ore dressing, are sintered into nickel agglomerate, are placed on the nickel-contained pig iron that in ordinary blast, reduction is refined roughly;
The rough nickel-contained pig iron of gained is placed in to ordinary arc furnace and is refined into the nickel-contained pig iron of low-phosphorous, low-sulfur claimed in claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310007226.XA CN103911561A (en) | 2013-01-08 | 2013-01-08 | Low-phosphorus low-sulphur nickel-containing pig iron and its preparation method |
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| CN201310007226.XA CN103911561A (en) | 2013-01-08 | 2013-01-08 | Low-phosphorus low-sulphur nickel-containing pig iron and its preparation method |
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| CN103911561A true CN103911561A (en) | 2014-07-09 |
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| CN201310007226.XA Pending CN103911561A (en) | 2013-01-08 | 2013-01-08 | Low-phosphorus low-sulphur nickel-containing pig iron and its preparation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106566904A (en) * | 2016-11-02 | 2017-04-19 | 朝阳力宝重工集团有限公司 | Method of one-step reducing melted iron ore concentrate to obtain low sulfur/phosphor pig iron |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08127838A (en) * | 1994-10-28 | 1996-05-21 | Nippon Steel Corp | Adamite or special cast iron material excellent in cracking resistance and surface roughening resistance |
| CN1193052A (en) * | 1997-03-10 | 1998-09-16 | 樊显理 | Nickel-contained pig iron for casting and producing method thereof |
| CN101285129A (en) * | 2008-05-22 | 2008-10-15 | 马和平 | Production process of modem blast furnace nickel smelting for nickel concentrate |
| CN101538626A (en) * | 2009-05-06 | 2009-09-23 | 毛黎生 | Method for directly producing nickel-bearing pig iron in rotary kilns by using laterite-nickel |
-
2013
- 2013-01-08 CN CN201310007226.XA patent/CN103911561A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08127838A (en) * | 1994-10-28 | 1996-05-21 | Nippon Steel Corp | Adamite or special cast iron material excellent in cracking resistance and surface roughening resistance |
| CN1193052A (en) * | 1997-03-10 | 1998-09-16 | 樊显理 | Nickel-contained pig iron for casting and producing method thereof |
| CN101285129A (en) * | 2008-05-22 | 2008-10-15 | 马和平 | Production process of modem blast furnace nickel smelting for nickel concentrate |
| CN101538626A (en) * | 2009-05-06 | 2009-09-23 | 毛黎生 | Method for directly producing nickel-bearing pig iron in rotary kilns by using laterite-nickel |
Non-Patent Citations (2)
| Title |
|---|
| 崔先云: "浅谈含镍生铁的生产方法", 《铁合金》 * |
| 崔先云: "浅谈含镍生铁的生产方法", 《铁合金》, no. 4, 31 December 2008 (2008-12-31), pages 1 - 7 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106566904A (en) * | 2016-11-02 | 2017-04-19 | 朝阳力宝重工集团有限公司 | Method of one-step reducing melted iron ore concentrate to obtain low sulfur/phosphor pig iron |
| CN106566904B (en) * | 2016-11-02 | 2018-10-12 | 朝阳力宝重工集团有限公司 | The method that one step reduction melting iron ore concentrate obtains the low-sulfur phosphorus pig iron |
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Application publication date: 20140709 |