CN102954684B - Making method for arc furnace cover - Google Patents

Abstract

The technical point of a making method for an arc furnace cover is that the making steps of the making method are as follows: (1) making of furnace cover material; (2) building of the furnace cover; and (3) formation of the furnace cover. The thermal efficiency of the furnace cover made by the making method is good, the original process which uses bitumen to increase internal temperature can be completely abandoned, consequently, the production cost is reduced, and meanwhile, environmental pollution is reduced as well; the service life of the arc furnace cover is long, and the loss caused by shutdown for the making of the furnace cover is greatly reduced. Compared with the prior art, the making method is simple, safe and reliable, and is easy to popularize, and meanwhile, the making cost is greatly reduced as well.

Description

A kind of preparation method of arc furnace cover

Technical field

The present invention relates to electric arc furnace smelting technical field, specifically one is applicable to multiple electric arc furnace smelting, is especially applied to the preparation method that titanium in ilmenite and iron carry out thermal release and makes the arc furnace cover of high titanium slag, acid-soluble slag.

Background technology

At present, in electric arc furnaces, the method for smelting reducing is that the titanium in ilmenite and iron are carried out to thermal release, the ilmenite that is mixed with reducing agent is placed in electric arc furnaces, more than compound in stove being warmed to 1800 degree with the electric heating field that electrode produces, and keep the recovery time about 40 minutes, titanium is separated, electric arc furnace smelting ilmenite with iron, the insulation material shell of nature sintering is difficult to ensure its required temperature and recovery time, so cannot ensure that product quality is completely up to standard.There are enough temperature and recovery time for ensureing to smelt, when electric arc furnace smelting ilmenite, should there is sealing bell, in traditional handicraft because there is no special arc furnace cover, in order to be incubated in stove, while smelting, in ilmenite powder, add pitch and the coke of some ratios, pitch when electric arc furnaces starts to smelt in furnace charge first at high temperature melts and then burns, and discharge a large amount of glance coals, the flue dust of thick black, wherein major part is tar mist grain, these tar adsorb a part in furnace charge, adsorbing these continues heated, in the time reaching uniform temperature, start to be carbonized, after carbonization with stove in upper strata ferrotianium compound form thick layer housing, play certain heat insulation effect, this housing can only be applicable to single stove and produces and have energy consumption high, the problems such as product quality is poor.

The deficiency that the traditional handicraft of electric arc furnaces production high titanium slag, acid-soluble slag exists is mainly by following some deficiency:

1. be unfavorable for safety, the furnace charge lid that upper strata furnace charge is formed in process of production, its intensity and density can not be controlled, easily uneven distribution, heating temperature is also unbalanced, the bell that the higher furnace charge of temperature is formed more easily subsides, powder splits, cause and turn over slag, and the ferrotianium water that furnace high-temperature dissolves is splashed everywhere, has very serious potential safety hazard;

2. a large amount of glance coals of discharging when pitch volatilizees in process of production and burns, fluorescent material in these glance coals, carcinogen, benzene, pyrene also evaporate, although upper strata furnace charge blocks a part, but most glance coal, sulphur cigarettes emit from electric arc fire door, environment and production environment around caused to great pollution;

3. the housing that furnace mix sinters into can be produced a stove, the duricrust that all a upper furnace accretion will be become after every furnace accretion bundle is smashed to pieces, the duricrust of smashing to pieces is fallen into and in stove, will be produced more substantial glance coal and dust spray comes up, workman working site is exactly to work in high temperature and a large amount of glance coal, and its labour intensity and environment are difficult to stand;

4. in furnace charge, to add a large amount of pitch in order producing, to make it form one deck duricrust as disposable insulation shell, not only increased very high production cost, and environment and discharge be all difficult to up to standardly, control expense also increases accordingly;

5. because disposable furnace mix heat-insulation layer is uncontrollable, heat-insulating property is also undesirable, is difficult to reach the required reduction temperature of smelting titanic iron ore, and lengthened the duration of heat, and energy consumption is high, and product quality cannot ensure;

6. high titanium slag, acid sludge is smelted multiplex a kind of raw material just increases a production cost.

In order to solve the problems such as the highly energy-consuming high pollution in traditional handicraft, it is that CN 101619925, name are called the innovation and creation of " preparation method of ferrotitanium dispersing arc furnace cover " that the applicant has participated in inventing publication number, become the smelting mode of two batch mixings by three batch mixings of traditional handicraft, although banned pitch, but make frequent and loaded down with trivial details production method and the roasting process of arc furnace cover, production cost is not reduced and existed the use of carbon materials and pitch.There is following some deficiency and defect in this patent:

1. bell is generally 1-2 month service life, just need again make one time bell, and often repair after the longevity, makes slightly error in bell process, will cause and stop production or the underproduction with electrode adhesion;

2. each making all time of handy 1-2 days of bell, not only delays production, but also wasting manpower and material resources, every stove must reduce the output of 50-60 stove over a year;

3. bell of roasting needs more than 10 hours, reactive power consumption electric energy;

4. because of some carbon material of bell material, enter and in stove, touch electrode and will strike sparks with electrode, the arc light producing is often burnt workman's eyes;

5. once carbon material enters in furnace charge, furnace charge itself is just with reducing agent (fixed carbon), and the furnace charge in stove will form carbon and cross victory, processes and easily causes not in time crucible, and electrode and crucible touching will make electric current moment increase, and the power-off of will tripping overloads;

6. bituminous concrete, itself also has pitch, also has sulphur cigarette and emerge when roasting, and half-hearted during as roasting, fire is too large, and pitch will burn thereupon, and glance coal had both polluted working environment, worked the mischief can to again the healthy of workman;

7. do every year bell several times, production cost will increase several times, reduces the number of times that does bell, will reduce production cost;

8. because the doping of carbon materials and other fire proofed wood is used, the oxidation rate of bell is so too fast that often to repair, and production cost increases again a lot;

9. make mould and expend steel manpower, it is exactly waste that the steel that use can not recycle.

Summary of the invention

The object of this invention is to provide a kind of preparation method of arc furnace cover, it is to cross the problems such as high in order to solve above-mentioned high titanium slag and acid-soluble slag environmental protection and the production cost in producing.China just has the pitch of nearly more than 20 ten thousand tons to produce for high titanium slag, titanium slag, acid-soluble slag for 2009 every year, though the glance coal discharging is reclaimed a part by each enterprise, but most being still discharged in natural environment gone, the use cost of pitch is with regard to more than 8,000 ten thousand, turned over one times by 2012, the present invention is to ban pitch as aim.

The object of the present invention is achieved like this: a kind of preparation method of arc furnace cover, is characterized in that: its making step is as follows:

(1) making of bell material

Get the fused magnesite that granularity is 1mm-8mm, the mullite of 1mm-4mm, white fused alumina and the liquid high-temperature resin of 5mm, stir 3-5 minute with following parts by weight: fused magnesite 6-13, mullite 4-7, white fused alumina 3-6, high-temperature resin 2.8-4.4;

(2) block of bell is smeared

On the step of fire door furnace wall inner side, shakeout with bell material, at least three work durms are embedded in bell material simultaneously, and an electrode is set in each work durm, electrode outside to the distance of work durm inner side is 45-55mm;

(3) moulding of bell

After the work described in completing steps (1), (2), use lower than the normal operating current using and smelt 3-4 hour, make bell moulding complete making.

The bell that the present invention produces, thermal effect is good, can abandon using pitch to improve the original process of temperature in stove completely, and then reduce production cost, has also reduced the pollution to environment simultaneously; Its long service life, greatly reducing stops work manufactures the loss that bell brings.The more existing technique of preparation method of the present invention is simple, safe and reliable and be easy to popularize also significantly reduction of manufacturing cost simultaneously.

Brief description of the drawings

Fig. 1 is the sectional structure schematic diagram of the arc furnace cover made of the present invention;

Fig. 2 is the top view of Fig. 1.

Detailed description of the invention

Example 1:

A preparation method for arc furnace cover, its step is as follows:

(1) making of bell material

Get granularity and be 13 kilograms of 17 kilograms of the white fused aluminas of 10 kilograms of mullites, 4-5mm of 60 kilograms of fused magnesites, the 3mm-4mm of 6mm-8mm and liquid high-temperature resins, stir 4 minutes;

(2) block of bell is smeared

As shown in Figure 1-2, on the step of fire door furnace wall 1 inner side, shakeout with bell material 3, three work durms 2 are embedded in bell material simultaneously, and an electrode 4 is set in each work durm, electrode outside to the distance of work durm inner side is 50mm;

(3) moulding of bell

After the work described in completing steps (1), (2), use lower than the normal operating current using and smelt 3 hours, make bell moulding complete making.

Example 2:

A preparation method for arc furnace cover, its step is as follows:

(1) making of bell material

Get granularity and be 15 kilograms of 25 kilograms of the white fused aluminas of 30 kilograms of mullites, 2-4mm of 30 kilograms of fused magnesites, the 1mm-3mm of 3mm-6mm and liquid high-temperature resins, stir 4 minutes;

(2) block of bell is smeared

As shown in Figure 1-2, on the step of fire door furnace wall 1 inner side, shakeout with bell material 3, three work durms 2 are embedded in bell material simultaneously, and an electrode 4 is set in each work durm, electrode outside to the distance of work durm inner side is 45mm;

(3) moulding of bell

After the work described in completing steps (1), (2), use lower than the normal operating current using and smelt 3.5 hours, make bell moulding complete making.

Example 3:

A preparation method for arc furnace cover, its step is as follows:

(1) making of bell material

Get granularity and be 15 kilograms of 25 kilograms of the white fused aluminas of 20 kilograms of mullites, 1-2mm of 40 kilograms of fused magnesites, the 4mm-7mm of 1mm-3mm and liquid high-temperature resins, stir 5 minutes;

(2) block of bell is smeared

As shown in Figure 1-2, on the step of fire door furnace wall 1 inner side, shakeout with bell material 3, three work durms 2 are embedded in bell material simultaneously, and an electrode 4 is set in each work durm, electrode outside to the distance of work durm inner side is 55mm;

(3) moulding of bell

After the work described in completing steps (1), (2), use lower than the normal operating current using and smelt 4 hours, make bell moulding complete making.

Example 4:

A preparation method for arc furnace cover, its step is as follows:

(1) making of bell material

Get granularity and be 22 kilograms of 18 kilograms of the white fused aluminas of 15 kilograms of mullites, 3-4mm of 45 kilograms of fused magnesites, the 2mm-3mm of 5mm-7mm and liquid high-temperature resins, stir 4 minutes;

(2) block of bell is smeared

As shown in Figure 1-2, on the step of fire door furnace wall 1 inner side, shakeout with bell material 3, three work durms 2 are embedded in bell material simultaneously, and an electrode 4 is set in each work durm, electrode outside to the distance of work durm inner side is 55mm;

(3) moulding of bell

After the work described in completing steps (1), (2), use lower than the normal operating current using and smelt 3 hours, make bell moulding complete making.

It is pointed out that embodiment above do not contain full content of the present invention.

Claims (1)

1. a preparation method for arc furnace cover, is characterized in that: its making step is as follows:

(1) making of bell material

Get the fused magnesite that granularity is 1mm-10mm, the mullite of 1mm-7mm, white fused alumina and the liquid high-temperature resin of 1-5mm, stir 3-5 minute with following percentage by weight: fused magnesite 30-60%, mullite 10-30%, white fused alumina 17-25%, high-temperature resin 13-22%;

(2) block of bell is smeared

On the step of fire door furnace wall inner side, shakeout with bell material, at least three work durms are embedded in bell material simultaneously, and an electrode is set in each work durm, electrode outside to the distance of work durm inner side is 45-55mm;

(3) moulding of bell

After the work described in completing steps (1), (2), use lower than the normal operating current using and smelt 3-4 hour, make bell moulding complete making.