CN102827997A - Calcium carbide ferro-aluminium alloy used for smelting steel, and preparation method thereof - Google Patents

Calcium carbide ferro-aluminium alloy used for smelting steel, and preparation method thereof Download PDF

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Publication number
CN102827997A
CN102827997A CN201110156710XA CN201110156710A CN102827997A CN 102827997 A CN102827997 A CN 102827997A CN 201110156710X A CN201110156710X A CN 201110156710XA CN 201110156710 A CN201110156710 A CN 201110156710A CN 102827997 A CN102827997 A CN 102827997A
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calcium
carbide
steel
ferro
calcium carbide
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谢应旭
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谢应旭
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Abstract

The invention relates to a calcium carbide ferro-aluminium alloy used for smelting steel, and a preparation method thereof. The calcium carbide ferro-aluminium alloy employs calcium carbide, aluminium, ferrum and the like as raw materials, is produced by a remelting perrin process, and is used for deoxidation and desulphurization of smelting the steel. The calcium carbide ferro-aluminium alloy comprises the following components of, by mass, 20-60% of aluminium, 5-40% of calcium, 1-15% of carbon, and the balance being ferrum and inevitable impurities. The calcium carbide ferro-aluminium alloy has good effects of deoxidation and desulphurization, and can reduce cost for smelting the steel while guaranteeing the quality of the steel.

Description

The carbide of calcium ferroaluminium and the preparation method that are used to make steel
Technical field
The present invention is used for deoxidation in steel making, desulfurization, impurity denaturing agent---carbide of calcium ferroaluminium, belongs to the chemical metallurgy technical field.
Background technology
The steelmaking aluminum deoxidation, its deoxidation products Al 2O 3Dystectic solid-state being mingled with.To become low-melting calcium aluminate to it and will carry out denaturing treatment with calcium.Calcium metal not only price is high, and utilization ratio is very low, and can calcium carbide and aluminium, iron be processed alloy with the carbide of calcium alternative metals calcium in the calcium carbide, and it is thing highly significant that the deoxidation while impurity that is used to make steel tails off.
Calcium carbide is a carbide of calcium, is mineral compound.Be mainly used in the raw material of Chemical Manufacture, also can do the steel desulfurization agent.Once the steel mill that had carries out the deoxidation test with the calcium carbide substitution of Al, because fusing point high (1750-2200 ℃), reaction influences the tapping time slowly in molten steel.In addition because calcium carbide light specific gravity (2g/cm 3), can not go deep into the deoxidation of molten steel depths, desulfurization, therefore generally do not promote.The steel mill that also has is used for deoxidation in steel making, desulfurization with part aluminium and part calcium carbide, does not have much difference with the aluminium deoxidation cost separately than former.In the prior art, the silica-based iron alloys such as Si-Al-Ca-Ba of electricity consumption masonry raw material production in the hot stove in ore deposit.Because the existence of silicon is arranged, and carbon containing is low in the alloy, but owing to siliceous height in the alloy, some steel grade can not use.The technological electricity consumption masonry raw material that also has is produced Ca-Fe alloy in reduction furnace, owing to do not have aluminium in the alloy, deoxidizing capacity is poor, does not also promote.And the production of these two kinds of products all is to produce in the hot stove in ore deposit with reduction method, is highly energy-consuming high pollution product, more than the ton power consumption 15000KVA.Process the calcium ferroaluminium with calcium metal and aluminium, iron in the prior art, because the calcium burning-point is low, combustion loss is big, and the high more scaling loss of calcium contents is big more, and calcium can only reach 3-5% in the calcium ferroaluminium, because calcium content hangs down and in steel-making, do not play much effects.Calcium contents will reach greater than 10%, and scaling loss is more serious.Because the calcium metal price is high, fire consumption is big, has caused the cost of alloy height to promote the use of.For above-mentioned reasons, technology is not used in actual production as yet and is promoted now.Calcium carbide has desulfurization, deoxidizing capacity, and price is low again, and power consumption has only about 3000KVA, how in steel-making, effectively to utilize, and be the problem that the present invention will solve.
Summary of the invention
The objective of the invention is mineral compound--calcium carbide and metallic aluminium, iron etc. are used the remelting hot-metal process, process the carbide of calcium ferroaluminium, and deoxidation that is used to make steel and desulfurization reach the assurance steel quality simultaneously, reduce steel-making cost, create better economic benefit.
The present invention processes the carbide of calcium ferroaluminium with calcium carbide, aluminium, iron etc.This alloy melting point is between 1350-1500 ℃, in molten steel, is swift in response, and does not influence the steel-making time.In alloy, add iron and increase proportion (3.0-4.0g/cm 3), the molten steel depths be can go deep into and deoxidation, desulfurization carried out, improve the utilization ratio of alloy.Using carbide of calcium ferroaluminium deoxidation products is low-melting calcium aluminate, and slagging is prone to come-up and removes, and has reduced in the steel to be mingled with.
In the carbide of calcium ferroaluminium of the present invention, contain aluminium 20-60% (mass percent, as follows), calcium 5-40%, carbon 1-15%, surplus is iron and unavoidable impurities.Contain carbide of calcium 60-85% in the calcium carbide, also contain quicklime, aluminium sesquioxide, silicon-dioxide, silicon oxide etc., these impurity are when refining carbide of calcium ferroaluminium, and big portion slagging is removed.For deoxidation, the sweetening power that improves alloy, can also in alloy, increase other deoxidant elements, as: barium, magnesium etc.For increasing alloy proportion, also can add manganese less.
The sweetening power of calcium is strong, a little less than the deoxidizing capacity; The aluminium deoxidation ability is strong, a little less than the sweetening power.These two kinds of elements combine, and the deoxidization desulfuration ability greatly strengthens.The crystal grain of the carbon ability refinement steel in the alloy, the performance of raising steel.But meeting carburetting in soft steel, the high quality that can influence steel of carbon.But through refining and with molten steel in oxygen combine generation CO and CO 2Discharge,,, can not impact the quality of steel below 0.01% so carburetting is micro-in the steel.For preventing the efflorescence of carbide of calcium ferroaluminium, adopt sealed package or vacuum impregnating noble gas packing.
Preparing method of the present invention converts remelting process with heat.Promptly be furnace of calcium carbide water to be put into dissolve stove, in smelting furnace, press proportioning again, add aluminium and iron etc., send electric temperature raising chemical combination.Also can be earlier that raw materials such as aluminium and iron is molten in smelting furnace, change into the ferro-aluminum liquation, again calcium carbide water is put into the smelting furnace that the ferro-aluminum liquation is housed and send electric temperature raising chemical combination, process the carbide of calcium ferroaluminium.
Below through specific embodiment explanation the present invention
Embodiment 1
Ratio of components: 100 kilograms in aluminium, 30 kilograms of steel scraps.Above-mentioned furnace charge is dropped in the middle frequency furnace, and melting is about 1 hour, and furnace temperature is about 1300 ℃, and furnace charge all melts, and again 50 kilograms of calcium carbide water is put into the ferro-aluminum liquation, send electric temperature raising to stir chemical combination again, and the scarfing cinder casting mold of coming out of the stove is processed the carbide of calcium ferroaluminium.Chemical examination composition: Al60%, Ca15%, C3%, Fe20%.Si1.6% in the impurity, S, P0.03%, other impurity are chemically examined.
Embodiment 2
One tableland scale metering is installed under the furnace of calcium carbide water outlet, puts a smelting furnace on the on-ground weigher.Calcium carbide water is put into smelting furnace, according to calcium carbide water weight, drops into aluminium and iron by proportioning again.The volume of smelting furnace is set according to the every furnace output of furnace of calcium carbide.About 5 tons in the every stove electrogenesis of this furnace of calcium carbide stone, the stokehold smelting furnace is 20 tons a medium-frequency induction furnace.
Calcium carbide water is put into intermediate frequency furnace, and checking the weight is 4816 kilograms, after all calcium carbide water is put into intermediate frequency furnace, send electric temperature raising.In the intermediate frequency smelting furnace, drop into 7000 kilograms of aluminium, 4000 kilograms of steel scraps by the alloying constituent proportioning again.All after the fusing, scarfing cinder is come out of the stove, and the carbide of calcium ferroaluminium is processed in the casting mold chemical examination.Always feed intake 15816 kilograms, 14886 kilograms of weight alloy, all the other are slag.Used calcium carbide contains CaC 280%.
The chemical examination alloying constituent:
Al45%, Ca20%, C8%, Fe25%, other impurity are chemically examined.
Embodiment 3
150 tons of converters of certain steel mill, production hot rolling book plate (container plate), former use aluminium deoxidation is 450 kilograms, 200 meters of denaturing agent-calcium core-spun yarns.With 400 kilograms of embodiment 1 carbide of calcium ferro-aluminums, do not add calcium core-spun yarn.C0.051% in the steel increases 0.01%.S0.03%, P0.03%, O30PPm, denaturing agent-calcium core-spun yarn useless.Through steel mill's test, carbide of calcium ferro-aluminum deoxidization desulfuration need not be fed calcium line than good with aluminium, though carbon slightly increases, does not influence the quality of steel.With the deoxidation of carbide of calcium ferro-aluminum substitution of Al, desulfurization, not only can guarantee to make steel quality, also reduce steel-making cost.

Claims (2)

1. be used to the carbide of calcium ferroaluminium and the preparation method that make steel, its skill wood is characterised in that: it is to use mineral compound calcium carbide and metallic aluminium and iron to be raw material, processes the carbide of calcium ferroaluminium with the remelting hot-metal process.
2. be used to the carbide of calcium ferroaluminium and the preparation method that make steel; Its technical characterictic is: the carbide of calcium ferroaluminium described in claim 1, and it contains mass percent: the aluminium of 20-60%, the calcium of 5-40%; The carbon of 1-15%, surplus are iron and unavoidable impurities.
CN201110156710XA 2011-06-13 2011-06-13 Calcium carbide ferro-aluminium alloy used for smelting steel, and preparation method thereof Pending CN102827997A (en)

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Cited By (7)

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Publication number Priority date Publication date Assignee Title
CN103451429A (en) * 2013-08-21 2013-12-18 北京科技大学 Method for smelting aluminum-calcium-iron alloy
CN103643089A (en) * 2013-12-19 2014-03-19 北京科技大学 High-carbon aluminum-iron alloy and preparation process thereof
CN105441632A (en) * 2014-08-21 2016-03-30 武汉凌科达科技有限公司 Magnesium-aluminium composite oxygen scavenger
CN105441633A (en) * 2014-08-21 2016-03-30 武汉凌科达科技有限公司 Preparation method of magnesium-aluminium composite oxygen scavenger
CN105950827A (en) * 2016-06-22 2016-09-21 唐山飞迪冶金材料有限公司 Compound calcium aluminum and application thereof in steelmaking production
CN106311999A (en) * 2015-06-30 2017-01-11 上海梅山钢铁股份有限公司 Premelting type heating casting slag
CN111151721A (en) * 2020-03-05 2020-05-15 谢应凯 Method for preparing molten steel purifying agent

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JPS5658912A (en) * 1979-10-19 1981-05-22 Denki Kagaku Kogyo Kk Desulfurizer of molten iron
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103451429A (en) * 2013-08-21 2013-12-18 北京科技大学 Method for smelting aluminum-calcium-iron alloy
CN103643089A (en) * 2013-12-19 2014-03-19 北京科技大学 High-carbon aluminum-iron alloy and preparation process thereof
CN105441632A (en) * 2014-08-21 2016-03-30 武汉凌科达科技有限公司 Magnesium-aluminium composite oxygen scavenger
CN105441633A (en) * 2014-08-21 2016-03-30 武汉凌科达科技有限公司 Preparation method of magnesium-aluminium composite oxygen scavenger
CN106311999A (en) * 2015-06-30 2017-01-11 上海梅山钢铁股份有限公司 Premelting type heating casting slag
CN105950827A (en) * 2016-06-22 2016-09-21 唐山飞迪冶金材料有限公司 Compound calcium aluminum and application thereof in steelmaking production
CN111151721A (en) * 2020-03-05 2020-05-15 谢应凯 Method for preparing molten steel purifying agent

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