CN201217071Y

CN201217071Y - Electric furnace apparatus for thermal insulation of nodular cast iron original iron liquor and pre-spheroidizing processing

Info

Publication number: CN201217071Y
Application number: CNU2008200764443U
Authority: CN
Inventors: 王宇新; 赵秉福
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-03-10
Filing date: 2008-03-10
Publication date: 2009-04-08
Anticipated expiration: 2018-03-10

Abstract

The utility model belongs to casting, cast iron smelting and base ductile iron melt pre-spheroidizing technical fields and in particular relates to an electric furnace used for preserving the heat and pre-spheroidizing base ductile iron melt. The electric furnace comprises a heat-preserving electric furnace body used to store base ductile iron melt and an electrothermally efficient core induction sensor arranged at the bottom of the furnace body to heat and stir the iron melt. A furnace cover and a graphite electrode provided with an automatic lifting device are arranged at the upper part of the furnace body. A layer of high-temperature melted alkaline liquid slag rich in active metal ions such as Mg<2+> and Ca<2+> is arranged on the surface of the iron melt inside the furnace body, and the melting point of the slag is adjusted and controlled to be within an appropriate range of 1,250-1,550 DEG C. The upper end of the graphite electrode is connected with a three-phase AC power source, the lower end of the graphite electrode extends into the alkaline liquid electroslag and remains at submerged arc operation state all the time, and the power of the graphite electrode only needs to be enough for heating and preserving the heat of the alkaline liquid slag. An iron inlet of the heat-preserving furnace is arranged above the surface of the alkaline liquid electroslag and is communicated with the atmosphere. The electric furnace can improve the quality of the base ductile iron melt and pre-spheroidize the base iron melt. The electric furnace reduces nodulizer consumption, and remarkably reduces the risk of spheroidization failure, and retards the harm of spheroidalization decaying during the casting process.

Description

Furnace equipment to insulation of spheroidal graphite cast-iron original iron melt and pre-spheroidizing processing

Technical field

The utility model belongs to casting, Castiron Melting, spheroidal graphite cast-iron original iron melt pre-spheroidizing processing technology field, is specifically related to a kind of furnace equipment to insulation of spheroidal graphite cast-iron original iron melt and pre-spheroidizing processing.

Background technology

Present large-scale ductile iron spare both domestic and external manufacturing enterprise often adopts the preparation of original iron melt and directly to transport mixed iron blast or the large-scale line-frequency induction that blast furnace iron liquid enters the coal gas heating core electric mantle heater is arranged; Adopt large-scale cupola melting scrap iron and steel, foundry returns, foundry iron etc.; Adopt high-power Medium frequency induction centreless electro-smelting steel scrap (needing to add carburant), foundry returns and foundry iron etc.; Above-mentioned technology only plays the fusing and the heat effect that heated up to the casting original iron melt basically, substantially can not make nodularization preliminary treatment effects such as original iron melt generation desulfurization, deoxidation, some equipment even also can in iron liquid insulating process, increase the weight of the oxidation of iron liquid and the scaling loss of silicomangan element, thereby make iron liquid self constantly generate a large amount of secondary oxidation slags, this iron liquid is not only nodulizer consumption increase when spheroidising, and the tendency of decaying spheroidisation also can strengthen simultaneously.

The utility model content

The purpose of this utility model just is to provide a kind of and is used for the spheroidal graphite cast-iron original iron melt when being incubated, also can continue it is carried out deoxidation, desulfurizing and purifying processing, thereby improve the surface tension of iron liquid, reach the furnace equipment that the magnesium iron original iron melt is carried out " pre-spheroidizing processing "; Because it can improve the quality of spheroidal graphite cast-iron original iron melt, original iron melt is played the pretreated effect of nodularization, therefore can reduce the consumption of nodulizer, can also obviously reduce the danger of spheroidising failure, and slow down in the casting process harm that decaying spheroidisation takes place, thereby improve spheroidal graphite cast-iron nodularization treatment conditions, strengthen the stability of nodular iron casting production technology, improve the reliability of iron casting mechanical performance and product quality.

The technical solution of the utility model is: the utility model comprises the electric mantle heater body of heater that stores the spheroidal graphite cast-iron original iron melt, be arranged on bottom of furnace body can to iron liquid heat and the high electrothermal efficiency of stirring the core inductor arranged, its architectural feature is: be equipped with bell and the graphite electrode that has apparatus for automatically lifting in upper of furnace body, be provided with one deck on the iron liquid liquid level in holding furnace and be rich in (Mg ²⁺), (Ca ²⁺) wait the high-temperature fusion caustic slag liquid of active metal ion, the fusing point adjustment of slag to be controlled at that (dated especially: the round parentheses " () " before and after each ion represent that this ion is an ion contained in the caustic slag in 1250 ℃～1550 ℃ the proper range herein; Square brackets " [] " before and after each ion represent that this ion is the ion in the ductile iron liquid); Termination three-phase alternating-current supply on the graphite electrode rod, the lower end of electrode bar stretch among the alkaline electroslag liquid, are in the arc-covering slag operation state all the time, and its power only need satisfy basic slag liquid heated and be incubated and gets final product; To be located at alkaline electroslag liquid level above and communicate with atmosphere for the Tie Kou that advances of holding furnace.

The beneficial effects of the utility model traditional large-scalely have core line-frequency induction circuit to be possessed the function (for example evenly iron liquid composition, insulation heats up, the supply of balance iron liquid, stablizes Workshop Production etc. to iron liquid) by: the utility model except that having kept, and also have following some special role important to ductile iron production:

1. iron liquid is rapidly heated in the furnace bottom inductor channel, and heat is provided and makes homogenization of composition for whole stove iron liquid by convection current conduction and stirring action; Float over the energy that basic slag on the iron liquid can obtain heating from the graphite electrode at top, in case and the sulfide emersion in the high temperature furnace slag and touch airborne oxygen, will generate SO at slag aerosphere face generating gasification desulphurization reaction ₂Gas discharges out of the furnace, thereby is thoroughly taken off in stove, has prolonged the life-span that recycles of basic slag liquid simultaneously.Iron liquid has the tight protection of high temperature electroslag, avoided oxygen in the ingress of air and the problem of oxidation again takes place.Build by laying near the slag line in the stove and can resist the refractory material that basic slag corrodes, reach long service life to guarantee furnace lining; Tapping hole is the spout of a teapot formula, both can play skimming and keep away the slag effect when tapping a blast furnace, and avoids the interference of slag to the spheroidising bag, can prevent that also the loss of basic slag from causing waste.

2. the high temperature iron liquid under caustic slag covers has been strengthened deoxidation effect.Hyperthermia and superheating iron liquid by right 〉=1500 ℃ stores insulation for a long time under caustic slag, the activity of utilizing the low electrode current potential of [C] in the high temperature iron liquid to be brought is fully taken off [O], thereby increases iron liquid surface tension and Fe-C _mInterfacial tension, impel the original iron melt that stores in the electric mantle heater to helping the direction transformation that vermicular cast iron and spheroidal graphite cast-iron generate, thereby when spheroidising, can reduce active metals such as magnesium metal that deoxidation, desulfurization consume and rare earth, thereby reduce the nodulizer consumption, reduce and avoid the risk of spheroidising failure, and delay the generation of decaying spheroidisation subsequently; Can also avoid simultaneously the scaling loss of element silicon and in stove, produce the secondary slag; The stable of silicon content not only saved Antaciron in the original iron melt, also guaranteed to be difficult for producing when producing as-cast ball iron free cementite.

3. adopt after this magnesium iron original iron melt special-purpose thermal insulation electric furnace, de-iron liquid is overheated, the relatively low high-power centreless Frequency Induction Heating electric furnace of insulation electrothermal efficiency owing to can economize, and reduced the turnover of iron liquid, ladle-to-ladle number of times and make the cooling of iron liquid reduce, thereby saved the power consumption that the workshop is heated up, is incubated the magnesium iron original iron melt.

This novel electric furnace combines that power frequency cored electric furnace is energy-conservation, temperature and composition is even, lining durability is long advantage, with graphite electrode low-power, high efficiency heating basic slag liquid, thereby be convenient to the deoxidation of iron liquid, desulfurization, thereby play the effect of the magnesium iron original iron melt being carried out " nodularization preliminary treatment ", thereby stablized the quality and the level of spheroidising; And can recycle in the basic slag liquid sweetening process, the life-span is long, cost is low; Can carry out at the cleaning door place of stove in the time of need changing slag, change the easier advantage of slag operation.

Description of drawings

Fig. 1 is the utility model structural representation

The specific embodiment

The utility model comprises the electric mantle heater body of heater 1 that stores the spheroidal graphite cast-iron original iron melt as shown in drawings, be arranged on body of heater 1 bottom can to iron liquid heat and the high electrothermal efficiency of stirring core inductor 2 arranged, be equipped with bell 3 and the graphite electrode 4 that has apparatus for automatically lifting on body of heater 1 top, be equipped with cleaning door 9 on the bell 3, be provided with one deck on iron liquid 5 liquid levels in holding furnace and be rich in (Mg ²⁺), (Ca ²⁺) wait the high-temperature fusion caustic slag liquid 6 of active metal ion, the fusing point adjustment of slag 6 to be controlled in 1250 ℃～1550 ℃ the proper range; Termination three-phase alternating-current supply on the graphite electrode rod 4, the lower end of electrode bar 4 stretch among the alkaline electroslag liquid 6, and are in the arc-covering slag operation state all the time, and its power only need satisfy basic slag liquid heated and be incubated and gets final product; To be located at alkaline electroslag liquid 6 liquid levels above and communicate with atmosphere for the iron mouth 7 that advances of holding furnace, and body of heater 1 another side is provided with tapping hole 8.

Claims

1, the furnace equipment that spheroidal graphite cast-iron original iron melt insulation and pre-spheroidizing are handled, this furnace equipment comprises the electric mantle heater body of heater that stores the spheroidal graphite cast-iron original iron melt, be arranged on bottom of furnace body can to iron liquid heat and the high electrothermal efficiency of stirring the core inductor arranged, it is characterized in that: be equipped with bell and have the graphite electrode of apparatus for automatically lifting in upper of furnace body, be provided with the high-temperature fusion caustic slag liquid in the scope that the adjustment of one deck fusing point is controlled at 1250 ℃～1550 ℃ on the iron liquid liquid level in holding furnace; Termination three-phase alternating-current supply on the graphite electrode rod, the lower end of electrode bar stretch among the alkaline electroslag liquid, are in the arc-covering slag operation state all the time, and its power only need satisfy basic slag liquid heated and be incubated and gets final product; To be located at alkaline electroslag liquid level above and communicate with atmosphere for the Tie Kou that advances of holding furnace.