CN105671247A - External refining method for powder injection dephosphorization for silicon-manganese alloy melt - Google Patents
External refining method for powder injection dephosphorization for silicon-manganese alloy melt Download PDFInfo
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- CN105671247A CN105671247A CN201610127759.5A CN201610127759A CN105671247A CN 105671247 A CN105671247 A CN 105671247A CN 201610127759 A CN201610127759 A CN 201610127759A CN 105671247 A CN105671247 A CN 105671247A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
Abstract
The invention relates to an external refining method for powder injection dephosphorization for a silicon-manganese alloy melt for solving the problems in a current external dephosphorization process for a high-phosphorous silicon-manganese alloy that the dephosphorization rate is low because the metallurgical kinetics conditions are poor and the like are solved. The external refining method for powder injection dephosphorization for the silicon-manganese alloy melt is low in production cost, easy for operation and easy for realization of industrial production. The external refining method is characterized in that at an optimum dephosphorization temperature, mixed gas of CO and Ar is taken as carrier gas; powder injection dephosphorization is performed on the silicon-manganese alloy melt by adopting a rotary injection blowing mode, so that the thermodynamics and kinetics conditions for dephosphorization reaction are greatly improved, and the utilization rate of a dephosphorization agent is improved. When the external refining method is applied to the dephosphorization process for the manganese-based alloy, for the silicon-manganese alloy subjected to powder injection dephosphorization treatment, the phosphorous content is lowered to 0.08%-0.1%; meanwhile, the sulphur content is lowered to 2 ppm-3 ppm; the carbon content is lowered to 0.3%-0.4%; the national first-level silicon-manganese alloy production standard is met; and the external refining method can be applied to production of third-generation automobile steel and other special steel.
Description
Technical field
The invention belongs to metallurgical technology field, particularly to a kind of silicomangan liquid powder dephosphorization secondary refining method.
Background technology
High quality silicon manganese alloy is the important alloy addition smelting the automobile steel such as TRIP steel, TWIP steel. The phosphorus content of alloy and phosphorus content are more low, and silicon content and manganese content are more high, then its use value is more high with economic worth. Dephosphorization is one of most important task in metallurgical process, and phosphorus can have a strong impact on processing and the serviceability of steel in the segregation of crystal boundary and " cold short " harm, and in iron and steel, one of important sources of phosphorus is exactly the manganese-silicon as alloy addition. Along with the high speed development of science and technology, high-quality clean steel is more and more stricter to the requirement of its impurity content. Therefore, how to reduce the phosphorus content of high phosphorus manganese-base alloy, be always up the important topic that domestic and international scientific research personnel pays close attention to for a long time.
At present, most of ferroalloy works substantially adopt basic slag or calcium containing alloy, be aided with wire-feeding technique or shaking ladle process and silicomangan is carried out extra furnace dephosphorization process. The patent of invention of publication number CN101962704A discloses a kind of method adopting specific core powder formula line feeding to produce the micro-carbon of low-phosphorous low-sulfur and low Carbon Manganese silicon alloy, adopts wire-feeding technique that manganese-silicon is carried out dephosphorization research. But in actual production, owing to being subject to aluminium alloy temperature, the fluctuation of composition and wire-feeding velocity and angle change impact, can cause that core-spun yarn penetration depth is low, line feeding failed, the situations such as Dephosphorising agent loss is serious, therefore, although this invention achieves low cost, safe and reliable continuous production, but its dephosphorization rate only has 40～50%, and desulfurization degree only has 50～60%. The patent of invention of publication number CN102020278A discloses a kind of removes the method for foreign matter of phosphor in silicon, adopt at 1450～1600 DEG C of temperature, in vaccum sensitive stove, be filled with noble gas, and with calcium containing alloy as Dephosphorising agent, carrying out dephosphorisation reaction in the molten state, dephosphorization carries out pickling after terminating. Through the silico briquette that dephosphorization treatment is crossed, phosphorus content, lower than 2ppm, achieves good dephosphorization effect. But this invention adopts induction furnace heating dephosphorization, and dephosphorization dynamic conditions is poor, and dephosphorization temperature is high, and energy consumption is high;Secondly, dephosphorization needs again to carry out pickling after terminating could remove impurity, and operation is complicated, and this invention does not provide the processing spec of sewage after pickling in addition. Dong Ying et al. (production of Purified Mnsi Alloy, " ferroalloy " periodical, calendar year 2001,2nd phase, 1-4 page) once carried out the pilot-plant test of parlkaline dephosphorized slag and metal shaking ladle dephosphorization, manganese-silicon CaO-CaF at 1350～1450 DEG C of temperature, to Si > 25%2(1:1) carry out dephosphorization treatment, reach the dephosphorization rate of 60%. But owing to smelting time is long, cause that the loss rate of Mn, Si is big. And there is no agitating device, the dynamic conditions of reaction is poor, and the contact area causing slag ferrum biphase is little, and dephosphorization efficiency is low.
Summary of the invention
It is an object of the invention to the technical problem that the silicomangan liquid phosphorus content of solution high-phosphorus manganese smelting is high, the secondary refining method of a kind of silicomangan liquid powder dephosphorization is provided, at best dephosphorization temperature, to mix gas for carrier gas, adopt rotary blowing mode that silicomangan liquid carries out powder dephosphorization, strengthen the thermodynamics and kinetics condition of dephosphorisation reaction. Aim to provide the production technology of a kind of low cost, high efficiency, easy-operating high phosphorus Dephosphorization of Ferrosilico-manganese.
The secondary refining method of a kind of silicomangan liquid powder dephosphorization, it is characterised in that adopt following steps:
1. mineral hot furnace or electric furnace smelting high-phosphorus manganese obtain high phosphorus silicomangan melt, be transferred to alloy bag and be transported to dephosphorizing station after carrying out slag gold separation;
2. adding the mean diameter covering slag less than 5mm in above-mentioned alloy bag, the component of covering slag is: 30%～50% Calx, 50%～70% fluorite, and the addition of covering slag is the 1%～3% of aluminium alloy;
3. the component of Dephosphorising agent is: silicon calcium powder and ferrosilicon powder, and its mixed proportion is 2:1～4:1. Silicon calcium powder and ferrosilicon powder are ground into granularity less than 3mm, Homogeneous phase mixing, weigh 1wt%～7wt% Dephosphorising agent of aluminium alloy quality, be placed in storage bin (6);
4. opening CO gas tank (1), CO flow-control is at 0.05Nm3/ min～0.10Nm3/ min;
5. detection aluminium alloy temperature, when aluminium alloy temperature is down to 1400 DEG C～1460 DEG C, opens Ar gas tank (2), and Ar throughput controls at 4Nm3/ min～8Nm3/ min; And open gas mixing device (3) simultaneously, mixing gas is through gas dryer (4) dried;
6. variable speed electric motors, particularly (5) is started, heat machine supplying powder (7) by screw and Dephosphorising agent heating to 100 DEG C～130 DEG C and is carried Dephosphorising agent, and open variable speed electric motors, particularly (8) simultaneously, and adjusting rotating speed, it is 6r/min～10r/min that rotation spray blow head (10) rotary speed controls at rotating speed;
7. the flow-control pressure 0.5MPa～1.5MPa at 200kg/min～400kg/min, CO and Ar gas gaseous mixture that dusts of Dephosphorising agent;
8. after winding-up stir process 3min～8min, end of dusting, stand until aluminium alloy and scratch clean the dephosphorized slag in alloy bag and covering slag after 5min～10min, finally casting obtains silicomangan block;
9. skimming after end, do harmless treatment to isolated slag surface sprinkling iron scale, manganese slag immediately, slag after treatment can use as cement and raw material of paving the way.
Further, the component of described Dephosphorising agent is: silicon calcium powder and ferrosilicon powder, and its mixed proportion is 2:1～4:1.
Further, the manganese-silicon melt temperature of described best dephosphorization treatment is 1400 DEG C～1430 DEG C.
Compared with prior art, present invention have the advantage that
The invention provides the secondary refining method of a kind of silicomangan liquid powder dephosphorization, carry out at ambient pressure, cost is low, easily operates, and easily realizes industrialization large-scale production.It is characterized in that at best dephosphorization temperature, to mix gas for carrier gas, adopt rotary blowing mode that silicomangan liquid is carried out powder dephosphorization, be substantially improved the thermodynamics and kinetics condition of dephosphorisation reaction, improve the utilization rate of Dephosphorising agent. The present invention is applicable to the dephosphorization technology of manganese-base alloy, through the silicomangan that powder dephosphorization processes, its phosphorus content is down to 0.08～0.1%, simultaneously, sulfur content is down to 2～3ppm, carbon content is down to 0.3～0.4%, meets country-level silicomangan production standard, it is possible to be applied to the production of the excellent special steels such as third generation automobile steel.
Accompanying drawing explanation
Fig. 1 is silicomangan powder dephosphorization apparatus structure schematic diagram, and Fig. 2 is silicomangan powder dephosphorization process chart.
Wherein: 1 is carbon monoxide gas tank; 2 is argon tanks; 3 is gas mixing device; 4 is gas dryer; 5 is variable speed electric motors, particularly; 6 is storage bin; 7 heat machine supplying powder for screw; 8 is variable speed electric motors, particularly; 9 is alloy bag; 10 is rotation spray blow head; 11 is slag; 12 is manganese-silicon melt.
Detailed description of the invention
In conjunction with example, the present invention is further described:
Embodiment 1
1. mine heat furnace smelting obtains high phosphorus silicomangan melt, is transferred to alloy bag and is transported to dephosphorizing station after carrying out slag gold separation, and aluminium alloy is weighed as 30t;
2. adding the mean diameter covering slag less than 5mm in above-mentioned alloy bag, the component of covering slag is: 30% Calx, 70% fluorite, and the addition of covering slag is the 1% of aluminium alloy;
3. the component of Dephosphorising agent is: silicon calcium powder and ferrosilicon powder, and its mixed proportion is 2:1. Silicon calcium powder and ferrosilicon powder are ground into granularity less than 3mm, Homogeneous phase mixing, weigh the 5wt% Dephosphorising agent of aluminium alloy quality, be placed in storage bin (6);
4. opening CO gas tank (1), CO flow-control is at 0.05Nm3/ min;
5. detection alloy melt temperature, when aluminium alloy temperature is down to 1440 DEG C, opens Ar gas tank (2), and Ar throughput controls at 4Nm3/ min; And open gas mixing device (3) simultaneously, mixing gas is through gas dryer (4) dried;
6. variable speed electric motors, particularly (5) is started, heat machine supplying powder (7) by screw and Dephosphorising agent heating to 100 DEG C and is carried Dephosphorising agent, and open variable speed electric motors, particularly (8) simultaneously, and adjusting rotating speed, it is 6r/min that rotation spray blow head (10) rotary speed controls at rotating speed;
7. the flow-control pressure 0.5MPa at 200kg/min, CO and Ar gas gaseous mixture that dusts of Dephosphorising agent;
8. after winding-up stir process 7.5min, end of dusting, stand until aluminium alloy and scratch clean the dephosphorized slag in alloy bag and covering slag after 5min, finally casting obtains silicomangan block.
After testing, the phosphorus content in silicomangan is reduced to 0.092% by 0.95%, dephosphorization rate 90.3%; Meanwhile, sulfur content is reduced to 2.7ppm, desulfurization degree 99% by 0.04%; Carbon content for be reduced to 0.36% by 1.5%, carbon-drop rate 76%. Meet country-level silicomangan production standard.
Embodiment 2
1. mine heat furnace smelting obtains high phosphorus silicomangan melt, is transferred to alloy bag and is transported to dephosphorizing station after carrying out slag gold separation, and aluminium alloy is weighed as 30t;
2. adding the mean diameter covering slag less than 5mm in above-mentioned alloy bag, the component of covering slag is: 40% Calx, 60% fluorite, and the addition of covering slag is the 2% of aluminium alloy;
3. the component of Dephosphorising agent is: silicon calcium powder and ferrosilicon powder, and its mixed proportion is 3:1. Silicon calcium powder and ferrosilicon powder are ground into granularity less than 3mm, Homogeneous phase mixing, weigh the 6wt% Dephosphorising agent of aluminium alloy quality, be placed in storage bin (6);
4. opening CO gas tank (1), CO flow-control is at 0.08Nm3/ min;
5. detection alloy melt temperature, when aluminium alloy temperature is down to 1450 DEG C, opens Ar gas tank (2), and Ar throughput controls at 6Nm3/ min; And open gas mixing device (3) simultaneously, mixing gas is through gas dryer (4) dried;
6. variable speed electric motors, particularly (5) is started, heat machine supplying powder (7) by screw and Dephosphorising agent heating to 110 DEG C and is carried Dephosphorising agent, and open variable speed electric motors, particularly (8) simultaneously, and adjusting rotating speed, it is 8r/min that rotation spray blow head (10) rotary speed controls at rotating speed;
7. the flow-control pressure 1.1MPa at 300kg/min, CO and Ar gas gaseous mixture that dusts of Dephosphorising agent;
8. after winding-up stir process 6min, end of dusting, stand until aluminium alloy and scratch clean the dephosphorized slag in alloy bag and covering slag after 8min, finally casting obtains silicomangan block.
After testing, the phosphorus content in silicomangan is reduced to 0.090% by 0.95%, dephosphorization rate 91%; Meanwhile, sulfur content is reduced to 2.5ppm, desulfurization degree 99% by 0.04%; Carbon content for be reduced to 0.32% by 1.5%, carbon-drop rate 79%. Meet country-level silicomangan production standard.
Embodiment 3
1. mine heat furnace smelting obtains high phosphorus silicomangan melt, is transferred to alloy bag and is transported to dephosphorizing station after carrying out slag gold separation, and aluminium alloy is weighed as 30t;
2. adding the mean diameter covering slag less than 5mm in above-mentioned alloy bag, the component of covering slag is: 50% Calx, 50% fluorite, and the addition of covering slag is the 3% of aluminium alloy;
3. the component of Dephosphorising agent is: silicon calcium powder and ferrosilicon powder, and its mixed proportion is 4:1. Silicon calcium powder and ferrosilicon powder are ground into granularity less than 3mm, Homogeneous phase mixing, weigh the 7wt% Dephosphorising agent of aluminium alloy quality, be placed in storage bin (6);
4. opening CO gas tank (1), CO flow-control is at 0.1Nm3/ min;
5. detection alloy melt temperature, when aluminium alloy temperature is down to 1460 DEG C, opens Ar gas tank (2), and Ar throughput controls at 8Nm3/ min; And open gas mixing device (3) simultaneously, mixing gas is through gas dryer (4) dried;
6. variable speed electric motors, particularly (5) is started, heat machine supplying powder (7) by screw and Dephosphorising agent heating to 130 DEG C and is carried Dephosphorising agent, and open variable speed electric motors, particularly (8) simultaneously, and adjusting rotating speed, it is 10r/min that rotation spray blow head (10) rotary speed controls at rotating speed;
7. the flow-control pressure 1.5MPa at 400kg/min, CO and Ar gas gaseous mixture that dusts of Dephosphorising agent;
8. after winding-up stir process 5.3min, end of dusting, stand until aluminium alloy and scratch clean the dephosphorized slag in alloy bag and covering slag after 10min, finally casting obtains silicomangan block.
After testing, the phosphorus content in silicomangan is reduced to 0.081% by 0.95%, dephosphorization rate 92%; Meanwhile, sulfur content is reduced to 2.1ppm, desulfurization degree 99% by 0.04%; Carbon content for be reduced to 0.31% by 1.5%, carbon-drop rate 79%. Meet country-level silicomangan production standard.
In conjunction with above-mentioned specific embodiment, carry out explaining in detail and explanation to the purpose of the present invention, technical scheme and beneficial effect, but examples detailed above has been only typical case's citing of embodiment, the restriction to embodiment of the present invention not.
Claims (3)
1. the secondary refining method of a silicomangan liquid powder dephosphorization, it is characterised in that adopt following steps:
1. mineral hot furnace or electric furnace smelting high-phosphorus manganese obtain high phosphorus silicomangan melt, be transferred to alloy bag and be transported to dephosphorizing station after carrying out slag gold separation;
2. adding the mean diameter covering slag less than 5mm in above-mentioned alloy bag, the component of covering slag is: 30%～50% Calx, 50%～70% fluorite, and the addition of covering slag is the 1%～3% of aluminium alloy;
3. the component of Dephosphorising agent is: silicon calcium powder and ferrosilicon powder, and its mixed proportion is 2:1～4:1. Silicon calcium powder and ferrosilicon powder are ground into granularity less than 3mm, Homogeneous phase mixing, weigh 1wt%～7wt% Dephosphorising agent of aluminium alloy quality, be placed in storage bin (6);
4. opening CO gas tank (1), CO flow-control is at 0.05Nm3/ min～0.10Nm3/ min;
5. detection aluminium alloy temperature, when aluminium alloy temperature is down to 1400 DEG C～1460 DEG C, opens Ar gas tank (2), and Ar throughput controls at 4Nm3/ min～8Nm3/ min; And open gas mixing device (3) simultaneously, mixing gas is through gas dryer (4) dried;
6. variable speed electric motors, particularly (5) is started, heat machine supplying powder (7) by screw and Dephosphorising agent heating to 100 DEG C～130 DEG C and is carried Dephosphorising agent, and open variable speed electric motors, particularly (8) simultaneously, and adjusting rotating speed, it is 6r/min～10r/min that rotation spray blow head (10) rotary speed controls at rotating speed;
7. the flow-control pressure 0.5MPa～1.5MPa at 200kg/min～400kg/min, CO and Ar gas gaseous mixture that dusts of Dephosphorising agent;
8. after winding-up stir process 3min～8min, end of dusting, stand until aluminium alloy and scratch clean the dephosphorized slag in alloy bag and covering slag after 5min～10min, finally casting obtains silicomangan block;
9. skimming after end, do harmless treatment to isolated slag surface sprinkling iron scale, manganese slag immediately, slag after treatment can use as cement and raw material of paving the way.
2. powder dephosphorization method according to claim 1, it is characterised in that the component of described Dephosphorising agent is: silicon calcium powder and ferrosilicon powder, its mixed proportion is 2:1～4:1.
3. powder dephosphorization method according to claim 1, it is characterised in that the manganese-silicon melt temperature of described best dephosphorization treatment is 1400 DEG C～1430 DEG C.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109055665A (en) * | 2018-08-08 | 2018-12-21 | 鞍钢股份有限公司 | A kind of compound dephosphorization method of Mn series alloy |
| CN110079673A (en) * | 2019-05-17 | 2019-08-02 | 北京科技大学 | A kind of pyro-refining method of Fast Purification copper scap |
| CN114908263A (en) * | 2022-06-11 | 2022-08-16 | 赤峰鑫旭铸造有限公司 | Preparation method of silicon-manganese alloy |
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| CN114908263A (en) * | 2022-06-11 | 2022-08-16 | 赤峰鑫旭铸造有限公司 | Preparation method of silicon-manganese alloy |
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