CN103602781B - Method for lowering chrome oxide in arc furnace slag in stainless steel smelting process - Google Patents
Method for lowering chrome oxide in arc furnace slag in stainless steel smelting process Download PDFInfo
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- CN103602781B CN103602781B CN201310570474.5A CN201310570474A CN103602781B CN 103602781 B CN103602781 B CN 103602781B CN 201310570474 A CN201310570474 A CN 201310570474A CN 103602781 B CN103602781 B CN 103602781B
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Abstract
The invention relates to a method for lowering chrome oxide in arc furnace slag in a stainless steel smelting process, which comprises the following steps: when the power supply amount reaches 53-55% of the total power supply amount, blowing oxygen for fluxing; (2) when the molten steel temperature reaches the tapping temperature after the scrap steel in the arc furnace is molten down, stopping blowing the oxygen, and blowing 100-200kg of silicon iron powder to the molten steel; blowing nitrogen at the rate of 1800 Nm<3>/h for stirring; (3) adding silicon iron and fluorite into the furnace to perform reduction while continuing blowing nitrogen at the rate of 1800 Nm<3>/h for stirring; (4) continuing power supply in the reduction process, and stopping power supply when the power supply amount reaches 2.5-3% of the total power supply amount; blowing nitrogen for stirring for more than 4 minutes, stopping the nitrogen stirring, shaking the furnace, and tapping; and (5) adding lime for slagging in the smelting process so that the alkalinity of the final arc furnace slag after reduction is 1.20-1.35. The method can lower the chrome oxide in the stainless steel arc furnace slag, enhance the recovery rate of chrome and lower the smelting cost.
Description
Technical field
The invention belongs to field of metallurgy; Be the technique in smelting stainless steel process, be specifically related to a kind of method reducing chromium oxide in stainless steel smelting process arc furnace slag.
Background technology
In full steel scrap stainless steel smelting process, electric arc furnaces allocates high carbon ferro-chrome, the raw material such as recirculating scrap, nickel alloy containing chromium nickel into, smelts the crude steel liquid close to stainless steel finished product.Crude molten steel continuous casting after external refining fine setting composition of electric arc furnaces output becomes steel billet.
In stainless steel smelting process, due to the characteristic that chromium is easily oxidized, with oxygen, there is high affinity, also can be oxidized when oxygen partial pressure is lower, therefore, in electric arc furnace smelting, the oxidation of silicon and carbon is often along with a large amount of chromium burning, chromium burnings a large amount of in oxidizing process enters in slag, causes chromium metal in stainless steel smelting to lose in a large number.97% the occurring in electric arc furnaces of loss of all chromium in stainless steel smelting process.
Because electric arc furnaces needs to pursue high efficiency production, often cannot consume the chromium metal in long period reducing slag, the dynamic conditions of adding electric arc furnaces is poor, and the chromium content in usual slag is up to about 9%, and reduction effect is poor, and chromium metal loss is serious.
Summary of the invention
High for chromic oxide content in stainless steel arc furnace slag, restore task weight, the difficult problem that chromium metallic reducing recovery difficult is large.The present invention proposes a kind of method reducing chromium oxide in stainless steel smelting process arc furnace slag; With the input of low cost, significantly reduce chromium oxide in stainless steel arc furnace slag, reduce the chromium loss in steelmaking process, improve the recycling of noble metal, reduce stainless smelting cost.
Technical scheme of the present invention comprises:
(1) postpone the electric arc furnace door carbon oxygen lance oxygen blown time, when power transmission amount delivers to the 53%-55% of total power transmission amount, use the oxygen blast of electric arc furnaces furnace door carbon oxygen lance to flux;
(2) in electric arc furnaces steel scrap thoroughly melting down after, blow off oxygen when liquid steel temperature reaches tapping temperature, use the carbon dust pipe winding-up ferrosilicon powder of electric arc furnaces furnace door carbon oxygen lance, bits mobility in adjustment stove, carry out prereduction, ferrosilicon powder winding-up amount is 100-200kg; Utilize oxygen blast tracheae nitrogen blowing to stir, nitrogen flow is 1800Nm3/h, simultaneously low-voltage, big current is powered, and (low-voltage is set to 550 volts for 90 tons of ac arc furnaces, transformer capacity 90MVA; Big current is set to 70 kilo-amperes).
Described low-voltage, big current determines according to arc furnace transformer capacity and voltage-regulation gear, the low-grade location voltage of general setting, the electric current of high tap position;
(3) after slag has fine mobility by step (2) adjustment, add ferrosilicon and fluorite reduces in stove, ferrosilicon and fluorite are according to weight 1:(1.5-2) proportioning adds, and addition is with heat size and the chromium content smelting steel grade calmly; (90t capacity of electric arc furnace, chromium content is the steel grade use ferrosilicon amount 250-400kg of 18%, fluorite 500-700kg) continues to use furnace door carbon oxygen lance oxygen hose nitrogen blowing to stir, nitrogen flow 1800Nm3/h simultaneously; Low-voltage, big current are powered;
(4) reduction process continues power transmission amount when reaching the 2.5%-3% of total power transmission amount, stops power supply; Furnace door carbon oxygen lance oxygen hose nitrogen blowing mixing time >=4min, stops nitrogen gas stirring, subsequently grate, and slag is mixed goes out steel;
(5) smelting process adds lime slag making, and after reduction, the basicity (CaO/SiO2) of electric furnace finishing slag controls at 1.20-1.35.
Detailed description of the invention
embodiment one:the full steel scrap stainless steel smelting of 90t, power consumption 37000kwh/ stove, implement the technical program as follows:
(1) furnace door oxygen lance oxygen blown opportunity is postponed.Furnace door carbon oxygen lance oxygen blast is brought into use to flux when power transmission amount reaches 20000kwh;
(2) waste steel for electric furnace thoroughly melting down after, blow off oxygen when temperature reaches tapping temperature 1620 DEG C, use bits mobility in the carbon dust pipe of furnace door carbon oxygen lance winding-up ferrosilicon powder adjustment stove to carry out prereduction, winding-up ferrosilicon powder amount 100-200kg ferrosilicon powder adjustment slag has good mobility; Oxygen hose nitrogen blowing stirs, nitrogen flow 1800Nm3/h, and low-voltage, big current are powered simultaneously.
(3) in stove, add ferrosilicon and fluorite reduces after having fine mobility by step (2) adjustment slag, ferrosilicon and fluorite are according to weight 1:(1.5-2) proportioning adds and uses ferrosilicon amount 250-400kg, fluorite 500-700kg; Continue to use furnace door carbon oxygen lance oxygen hose nitrogen blowing to stir, nitrogen flow 1800Nm3/h simultaneously; Low-voltage, big current are powered;
(4) reduction process continued power 900-1100kwh, stops power supply; Furnace door carbon oxygen lance oxygen hose nitrogen blowing mixing time >=4min, stops nitrogen gas stirring, subsequently grate, and slag is mixed goes out steel;
(5) smelting process adds lime slag making, and after reduction, the basicity (CaO/SiO2) of electric furnace finishing slag controls at 1.20-1.35.
Implement according to the technical program, in arc furnace slag, average oxidation chromium is reduced to 2.72% by former 6.55%.
The equal tap of stove 89 tons, ton slag amount 150.9Kg, annual production 480000 tons, direct economic benefit: in slag, chromic oxide content is reduced to 2.72% by 6.55%, ton steel reclaims pure chromium 3.953kg, and single stove reclaims pure chromium 351.82kg.
Ton steel economic benefit=ton steel produces price=150.9Kg/ ton steel × (6.55%-2.72%) × 0.684 × 12 yuan=47.43 yuan/ton of steel of the content × pure chromium of pure chromium in chromic oxide content × chromium oxide in the slag of the quantity of slag × reduction.
Year benefit=yuan/ton steel × 480,000, ton steel benefit × annual production=47.43 ton=2277.01 ten thousand yuan
embodiment two:the full steel scrap stainless steel smelting of 50t, power consumption 24000kwh/ stove, implement the technical program as follows:
(1) furnace door oxygen lance oxygen blown opportunity is postponed.Furnace door carbon oxygen lance oxygen blast is brought into use to flux when power transmission amount reaches 14000kwh;
(2) waste steel for electric furnace thoroughly melting down after, blow off oxygen when temperature reaches tapping temperature 1620 DEG C, use bits mobility in the carbon dust pipe of furnace door carbon oxygen lance winding-up ferrosilicon powder adjustment stove to carry out prereduction, winding-up ferrosilicon powder amount 100-200kg ferrosilicon powder adjustment slag has good mobility; Oxygen hose nitrogen blowing stirs, nitrogen flow 1800Nm3/h, and low-voltage, big current are powered simultaneously.
(3) in stove, add ferrosilicon and fluorite reduces after having fine mobility by step (2) adjustment slag, ferrosilicon and fluorite are according to weight 1:(1.5-2) proportioning adds and uses ferrosilicon amount 150-200kg, fluorite 300-400kg; Continue to use furnace door carbon oxygen lance oxygen hose nitrogen blowing to stir, nitrogen flow 1800Nm3/h simultaneously; Low-voltage, big current are powered;
(4) reduction process continued power 700kwh, stops power supply; Furnace door carbon oxygen lance oxygen hose nitrogen blowing mixing time >=4min, stops nitrogen gas stirring, subsequently grate, and slag is mixed goes out steel;
(5) smelting process adds lime slag making, and after reduction, the basicity (CaO/SiO2) of electric furnace finishing slag controls at 1.20-1.35.
Implement according to the technical program, in arc furnace slag, average oxidation chromium is reduced to 2.87% by former 6.85%.
The equal tap of stove 48 tons, ton slag amount 163.3Kg, annual production 250000 tons, direct economic benefit: in slag, chromic oxide content is reduced to 2.87% by 6.85%, ton steel reclaims pure chromium 4.44kg, and single stove reclaims pure chromium 213.12kg.
Ton steel economic benefit=ton steel produces price=163.3Kg/ ton steel × (6.85%-2.87%) × 0.684 × 12 yuan=53.34 yuan/ton of steel of the content × pure chromium of pure chromium in chromic oxide content × chromium oxide in the slag of the quantity of slag × reduction.
Year benefit=yuan/ton steel × 250,000, ton steel benefit × annual production=53.34 ton=1333.5 ten thousand yuan.
Claims (1)
1. reduce a method for chromium oxide in stainless steel smelting process arc furnace slag, its feature comprises:
(1) when power transmission amount delivers to the 53%-55% of total power transmission amount, electric arc furnaces fire door oxygen gun blowing is used to flux;
(2) in electric arc furnaces steel scrap thoroughly melting down after, blow off oxygen when molten steel temperature reaches tapping temperature, to the ferrosilicon powder of molten steel winding-up 100-200kg; Nitrogen blowing stirs, and nitrogen flow is 1800Nm
3/ h, low-voltage, big current are powered simultaneously;
(3) in stove, add ferrosilicon and fluorite reduces, ferrosilicon and fluorite are according to weight 1:(1.5-2) proportioning adds, continues nitrogen blowing simultaneously and stir, nitrogen flow 1800Nm
3/ h;
(4) reduction process continues power transmission amount when reaching the 2.5%-3% of total power transmission amount, stops power supply; Furnace door oxygen lance nitrogen blowing mixing time >=4min, stops nitrogen gas stirring, subsequently grate, and slag is mixed goes out steel;
(5) smelting process adds lime slag making, and after reduction, the basicity of electric arc furnaces finishing slag controls at 1.20-1.35.
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| CN201310570474.5A CN103602781B (en) | 2013-11-17 | 2013-11-17 | Method for lowering chrome oxide in arc furnace slag in stainless steel smelting process |
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| CN201310570474.5A CN103602781B (en) | 2013-11-17 | 2013-11-17 | Method for lowering chrome oxide in arc furnace slag in stainless steel smelting process |
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| CN103602781B true CN103602781B (en) | 2015-03-25 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104789736B (en) * | 2015-05-18 | 2017-01-11 | 安徽富凯特材有限公司 | Method for reducing chromium element in electric arc furnace slag |
| CN108456763A (en) * | 2017-02-22 | 2018-08-28 | 宝钢特钢有限公司 | Based on the high electric furnace smelting method for returning to material ratio production mould steel |
| CN107267850B (en) * | 2017-06-07 | 2019-02-01 | 北京科技大学 | The stainless steel smelting method of chromium in a kind of recycling smelting slag |
| CN107419055B (en) * | 2017-08-16 | 2019-11-12 | 攀钢集团研究院有限公司 | With the process and its mother liquor of stainless steel of smelting mother liquor of stainless steel from electric furnace |
| CN109628688A (en) * | 2018-12-29 | 2019-04-16 | 钢铁研究总院 | A kind of online Detoxified treatment method of chromium in stainless steel slag |
| CN110499405A (en) * | 2019-10-08 | 2019-11-26 | 安徽富凯特材有限公司 | A method of reducing chromic oxide content in smelting mother liquor of stainless steel from electric furnace clinker |
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| PT1747297E (en) * | 2004-05-18 | 2008-02-13 | Holcim Ltd | Method for reducing cr in metallurgical slags containing cr |
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