CN1026799C - Prodn. of high-chromium, low-phosphorus, and low carbon chromium-iron - Google Patents
Prodn. of high-chromium, low-phosphorus, and low carbon chromium-iron Download PDFInfo
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- CN1026799C CN1026799C CN90100120A CN90100120A CN1026799C CN 1026799 C CN1026799 C CN 1026799C CN 90100120 A CN90100120 A CN 90100120A CN 90100120 A CN90100120 A CN 90100120A CN 1026799 C CN1026799 C CN 1026799C
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- slag
- low
- ladle
- chromium
- carbon
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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
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The present invention relates to a method for producing ferrochromium with high chromium, low phosphorus and low micro-carbon. When medium-carbon ferrochromium is blown by a top-blower oxygen converter, 1 to 1.5 times more lime is added for forming slag so that the alkalinity of final slag is larger than 1.0. A measured silicochromium reducing agent is added according to the proportion of 150 to 250 kg per ton of slag by utilizing the converter slag to carry out ladle-to-ladle operation twice or three times outside the converter and prepare a qualified product. Products produced by the method have the characteristics of low phosphorus content, low carbon content but high chromium content. The method has the advantages of simple technology, less equipment investment, low cost and convenient management. A new approach is opened up for fully utilizing resources and increasing the utilization rate of converter slag.
Description
The present invention relates to the production method of low-phosphorous, the humble carbon ferrochrome of high chromium, is specially in top blown oxygen converter blowing medium carbon ferrochrome, utilizes its slag, reclaims wherein chromium, produces the method for the low-phosphorous humble carbon ferrochrome of a kind of high chromium.
The low-phosphorous humble carbon ferrochrome of high chromium can be used as the stainless raw material of low temperature resistant steel.For a long time, it is by three electric furnaces, is raw material with chrome ore, silica, coke, lime etc., divides for three steps processed and produced, i.e. Tong Cheng three-step approach.With such method, production process is long, and required equipment is many, and wastage of material is big, power consumption is high.
Task of the present invention provides a kind of slag that utilizes, and reclaims chromium in the slag, produces the novel method of low-phosphorous, the humble carbon ferrochrome of high chromium.
Task of the present invention is implemented by following steps:
1, slag making.Program is blended into the high carbon ferro-chrome molten iron in converter routinely, oxygen blast, adds chrome ore and lime blowing medium carbon ferrochrome.For obtaining slag required for the present invention, should add 1～1.5 times lime than routine production, promptly add 103.6～162(kg/t high carbon chromium molten iron) lime, lime should add in batches, control size is to guarantee that furnace temperature is suitable, it is good to change slag, guarantees finishing slag basicity CaO/SiO＞1.0, at this moment the rate of recovery of chromium higher (conventional basicity of producing slag only is about 0.6) in the slag.When the molten iron carbon content is 1.8-1.5% from the 8% 2-1%(preferred range that blows) time can slag tap.
2, add alloy.Slag is poured in the hot metal ladle, is preferably 170-200 by slag 150～250(per ton simultaneously) amount of Kg adds preprepared reductive agent-silicochrome (GB GB4009-89).Excessive for preventing that silicochrome from adding, can add 85%～90% of silicochrome total amount earlier, slag tap finish before gradation finish, and shake hot metal ladle and make it sufficient reacting.Silicochrome adds the back following reaction takes place, and produces a large amount of heats.
3, ladle-to-ladle.For making above-mentioned reacting completely, improve the utilization ratio of silicon, carry out ladle-to-ladle, slag is poured the mixture of slag and silicochrome into another hot metal ladle from a hot metal ladle after weighing, add in the silicochrome total amount remaining 10～15% simultaneously, ladle-to-ladlely carry out secondary or three times, decide on slag temperature, product slag inclusion in order to prevent to cast, temperature is lower than 1650 ℃ and should casts immediately.
4, casting.Molten iron after ladle-to-ladle can be cast, and obtains containing chromium 80-85%, phosphorus 0.01～0.02%, and carbon and other composition meet the product of GB5683～87 standards.Still contain Cr in the finishing slag
2O
3About 18～23% can also take additive method to reclaim.
5, with above-mentioned 2,3,4 operations simultaneously, the converter medium carbon ferrochrome that blows as usual adds the slag making material, adjusts slag temperature and composition, continues the oxygen blast number and minute can come out of the stove.
The main effect of the present invention is to utilize existing equipment to develop a kind of novel process, a kind of product innovation, has improved the economic benefit of factory.
The present invention is actually a kind of " perrin process ", and this method has following advantage:
1, manufacturing procedure is short, and equipment is few.Present method only needs an ore-smelting furnace (producing silicochromium, regeneration product carbon chromium earlier), and a converter can be produced in same workshop.
2, produce various trade mark chromium alloys in same workshop, equipment is few, investment is low, floor space is little, be applicable to medium and small producer.
3, present method is produced the power consumption (every cube of oxygen is rolled over electric 2KWh) of low, little chromium carbon ironworker preface than electric furnace process economize on electricity 1600KWh/ base ton with the oxo electricity.
4, present method products obtained therefrom quality is good, and phosphorus content is lower than 0.01～0.02%, can be used as the material of low-temperature alloy, and social benefit is good.
5, compare with traditional technology,, can increase the thousands of units of converter comprehensive benefit with the every production 1 base ton product of present method.
One embodiment of the present of invention is as follows:
Schedule of operation:
(1) in converter, be blended into high carbon ferro-chrome molten iron 5.4 real tons, its composition weight %:
C????8.20;Si????0.66;Cr????65.80;S????0.034;
Surplus is Fe and other compositions.
(2) grate, oxygen blast, furnace temperature adds chrome ore 450Kg after rising.
(3) add first batch of lime 500Kg then, add second crowd of lime 200Kg again after melting, continue the good slag of blowing several minutesization, record molten iron carbon content in the stove＜1.8%.
(4) grate is prepared to slag tap, and taking out just in stove, slag specimen, its composition are weight %:
C 0.054 SiO
29.10 Cr
2O
354.39 S 0.112
FeO 0.85 Al
2O
32.75 CaO 27.22 MgO 4.76
Surplus is other compositions.
(5) grate is slagged tap, and adds silicochrome 300Kg simultaneously, its composition weight %:
C 0.035; Si 45.35; Cr 32.18; P 0.014; Surplus is other compositions.Strictness forbids overflowing ferrochrome when slagging tap.
(6) weighing slag 1710Kg.
(7) for the first time ladle-to-ladle, add silicochromium 40Kg.
(8) temperature height, for the second time ladle-to-ladle, ladle-to-ladle for the third time.
(9) the iron sample is got in casting, the finishing slag sample, and composition weight % is as follows separately:
C????0.047;Si????0.23;Cr????85.80;P????0.007;S????0.049;
Surplus is Fe and other compositions;
MgO 8.33;C 0.074;SiO
231.50;Cr
2O
319.48;
S 0.126;FeO 0.28;Al
2O
33.30;CaO 36.66;
Surplus is Fe and other compositions.
(10) get extra low carbon ferrochromium amount true weight 600Kg, amount to 1.03 benchmark tons, finishing slag 1450Kg draws medium carbon ferrochrome 6.205 base tons, consumption Fe-Si 75%190Kg with stove.
Annotate: ferrochrome weight is a benchmark ton to contain chromium 50%, and promptly every 500Kg chromium is a benchmark ton.All percentage ratios of this paper all are weight percentage.
Claims (3)
1, a kind ofly in top blown oxygen converter blowing medium carbon ferrochrome, utilize slag to reclaim the wherein production method of low-phosphorous, the humble carbon ferrochrome of high chromium of chromium, it is characterized in that:
(1) program is blended into the high carbon ferro-chrome molten iron in converter routinely, oxygen blast, add chrome ore ash, blowing during medium carbon ferrochrome, increase by 1～1.5 times of the addition of lime wherein, the lime that promptly adds 103.6～162 (kg/t high carbon chromium molten iron), make finishing slag alkali CaO/SiO＞1.0 of giving up, when the molten iron carbon content is reduced to 2-10% (weight percent), can slag tap;
(2) slag is poured in the hot metal ladle, the amount by slag 150～250Kg per ton adds silicochrome simultaneously, and the 85-90% of its total add-on (weight percent) Ying Yu finishes before slagging tap and finishing, and makes it sufficient reacting;
(3) slag mixture molten iron hot metal ladle outside that will be added with silicochrome is poured another hot metal ladle into, add 10～15% last in the total add-on of silicochrome (weight percents) simultaneously, ladle-to-ladle carrying out 2～3 times, decide on slag temperature, when in a single day temperature is lower than 1650 ℃, should cast immediately;
(4) molten iron after ladle-to-ladle, casting promptly get low-phosphorous, the humble carbon ferrochrome of high chromium.
2, the production method of low-phosphorous, the humble carbon ferrochrome of high chromium as claimed in claim 1, it is characterized in that: the molten iron carbon content is 1.8～1.5%(weight percent during described slagging tap).
3, the production method of low-phosphorous, the humble carbon ferrochrome of high chromium as claimed in claim 1 or 2 is characterized in that: described alloy addition level adds by the amount of slag 170～200Kg per ton.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN90100120A CN1026799C (en) | 1990-01-06 | 1990-01-06 | Prodn. of high-chromium, low-phosphorus, and low carbon chromium-iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN90100120A CN1026799C (en) | 1990-01-06 | 1990-01-06 | Prodn. of high-chromium, low-phosphorus, and low carbon chromium-iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1053093A CN1053093A (en) | 1991-07-17 |
| CN1026799C true CN1026799C (en) | 1994-11-30 |
Family
ID=4876484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN90100120A Expired - Fee Related CN1026799C (en) | 1990-01-06 | 1990-01-06 | Prodn. of high-chromium, low-phosphorus, and low carbon chromium-iron |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1026799C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1098364C (en) * | 1999-04-23 | 2003-01-08 | 王健民 | High-purity micro-carbon ferrochromium and its production method |
| CN100368578C (en) * | 2006-03-08 | 2008-02-13 | 羊实 | Heat-exchanging ladle-to-ladle method for producing low-carbon, micro-carbon iron alloy |
| CN103033047B (en) * | 2011-09-30 | 2014-07-02 | 广西玉柴机器股份有限公司 | Line frequency furnace transition fore-hearth and smelting method with the same applied |
| CN104294002B (en) * | 2014-10-23 | 2016-04-13 | 北京科技大学 | A kind of method introducing carbonic acid gas converter single stage method smelting middle-low-carbon ferrochrome |
| CN105779687B (en) * | 2016-04-29 | 2018-06-08 | 内蒙古华鑫硅材料科技有限公司 | A kind of production method of low-phosphorous chromic carbide iron |
| CN110607445A (en) * | 2019-09-10 | 2019-12-24 | 抚顺市鑫隆硅镁铬有限公司 | Production method of low-micro-carbon ferrochrome |
| CN114855002B (en) * | 2021-07-06 | 2023-04-25 | 丰镇市华兴化工有限公司 | Low-titanium high-carbon ferrochrome and production method thereof |
| CN114855003B (en) * | 2021-07-06 | 2023-05-12 | 丰镇市华兴化工有限公司 | Low-titanium low-sulfur ferrochrome and production method thereof |
-
1990
- 1990-01-06 CN CN90100120A patent/CN1026799C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1053093A (en) | 1991-07-17 |
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