CN101261082B - Zinc metallurgy ore smelting electric arc furnace spherical top integral pouring and maintenance method - Google Patents

Abstract

The invention provides a method for integral casting and maintaining a zinc ore metallurgy thermal-electric furnace globe-roof. A reasonable central angle is selected according to the electric furnace type and the power and an electrode hole and a feeding hole are positioned. The vault is cast in a way of rings and blocks, the thickness is 350 millimeters; the center thickness of the electrode hole is 450 millimeters. A clip is used for connecting blocks into a whole. The middle of each template is provided with thermolability expansion gap vertically and discontinuously. The material adopts a veneer board more than or equal to 3 millimeters. Each template reserves three veneer boards with areas of 80 multiplied by 300 millimeters and is fixed on the upper part of the inner mould vertically. After casting, the demoulding is performed and furnace is dried. The method has the advantages of simple construction technology, short time limit for a project, high construction quality and security, environment protection, good leak tightness of the furnace, low electric energy consumption, long service life and low cost.

Description

Integrated poured and the maintenance process of zinc metallurgy ore-smelting electric furnace dome

Technical field

The invention belongs to the metallurgical unshape refractory application technology of ore-smelting electric furnace, mainly propose a kind of integrated poured technology of novel, environment-friendly type dome.

Background technology

China is that the first in the world is produced zinc big country, but the consumption per capita of zinc is 0.8kg/a only, the world is 1.2kg/a per capita, the U.S. is 5.6kg/ per capita, China is lower than world's per capita share, and the productivity per worker of China's zinc smelting industry is about 1/10 of industrially developed country simultaneously, and for example the direct pressurized acid leaching zinc hydrometallurgy of zinc ore, these process cycles with obvious advantage of electric furnace industrialization zinc metallurgy are lacked at critical process, direct rate height, the having a long way to go of our zinc metallurgy of environment protection standard aspect.

Ore-smelting electric furnace zinc metallurgy still is new things in China, not enough vicennial developing history, in electric furnace zinc smelting fundamental research, process optimization, coordinative composition of equipments, material upgrades particularly refractory life, all also there are many problems in power consumption and the zinc metallurgy of Large Furnace large capacity electric stove, some or even fatal problem.3 of special electric furnace top (is example with 3000KVA) φ 400 electrode holes, 4 of φ 320mm charging apertures, 2 of φ 100 thermometer holes.The vault hole is many, also requires the stove sealing, and when technological operation went wrong, these had caused extremely harsh operating mode all for the furnace roof of ore-smelting electric furnace zinc metallurgy towards the slope for the transformation of reaction atmosphere, stove malleation, furnace gas.Therefore, we are according to the service condition of 2000～3000KVA zinc metallurgy ore-smelting electric furnace dome, use the characteristics of material, actual in conjunction with many zinc smelting furnace refractory materials application at the end of the nineties, propose novel, reasonable, the environment-friendly type integral casting program of a cover, will play great impetus the raising life of arched roof of ore-smelting electric furnace key.

Summary of the invention

The objective of the invention is, the deficiency that is intended to solve the problems of the technologies described above has proposed a kind of unshape refractory integrated poured and maintenance and furnace drying method of zinc metallurgy ore-smelting electric furnace dome.

The present invention is the deficiency that solves the problems of the technologies described above, the technical scheme that is adopted is: press rational central angle of electric furnace type and power selection and keeper electrode hole, charging aperture, vault is taked the cast of branch ring piecemeal, thickness 350mm, electrode circle center thickness 450mm is linked to be an integral body with the heat-resistance stainless steel anchoring piece between piece and the piece.Every template central longitudinal is provided with the heat property lost dilatation joint to interruption, the glued board of material employing≤3mm, every template is reserved 3 80 * 300mm, is vertically fixed on internal mold top, cast back demoulding baker promptly forms to be interrupted and heat is set loses property demiinflation seam, center circle in reserve one in the heart.

3000KVA electric furnace vault is divided into 3 21 on rings pours into a mould, accurately control center of circle angle.

Vault internal mold outer surface requires smooth smooth, finishes line and accomplishes that tangent plane is vertical by the cast piecemeal in advance.

Between every ring and the ring heat-resistance stainless steel is set and connects the muscle anchoring piece, brush the pitch prill lacquer twice, be fixed between the two ring templates, guarantee to imbed in the cast bed of material by design height.

Furnace roof electrode hole cavity portion is integrated poured, can not piecemeal.

Furnace roof middle part generally thickens to 450mm, and the accident to furnace roof when beating open arc and change oxidizing atmosphere or stove malleation towards the slope with the opposing electrode corrodes.

Construction of the present invention, maintenance and furnace drying method:

1. pour into a mould water and be clean domestic water, pH value 6-8;

Environment temperature when 2. pouring into a mould should be controlled at 5～35 ℃ of scopes;

3. all hole all will be undertaken and reserves by size by loose tool before the cast;

4. before watering the material feeding use, sack is sealed take apart earlier, the pouch bond is poured in the sack, again sack integral body is poured in the mixer, siccative stirs after 3 minutes and adds water, amount of water with quality guarantee single in given numerical value be as the criterion, add to stir again behind the water and can discharging pour into a mould in 5 minutes;

5. the wet feed that stirs should 40 minutes with the interior wooden model internal vibration moulding of packing into, remainingly water material feeding and should must not use again by waste disposal;

6. in casting process shock club want slow-motion, go out slowly, evenly vibrations, avoid occurring shaking and the leakage situation of shaking;

7. arch springing beam casting complete is answered after the natural curing 48 hours, again formwork cast furnace roof;

8. the furnace roof casting complete got final product the demoulding in 36 hours, and natural curing can begin baker in 48 hours again;

9. should carry out in strict accordance with drying out curve, its furnace drying method is: 150 ℃ continue 8 hours, and 300 ℃ continue 32 hours, and 450 ℃ continue 16 hours, and 550 ℃ continue 16 hours, and 700 ℃ continue 16 hours, and 850 ℃ continue 16 hours, and 1000 ℃ continue to the operation temperature.

Advantage of the present invention is:

1, construction technology is simple, and the duration is short;

2, construction quality height, safety, environmental protection;

3, stove good airproof performance, power consumption is low;

4, long service life, cost is low.

Figure of description

Fig. 1 is 60 ℃ of central angle schematic diagrames of spherical vault of the present invention;

Fig. 2 is electric furnace vault electrode circle of the present invention, charging aperture, thermometric pressure tap schematic diagram;

Fig. 3 is spherical vault cast template of the present invention supporting and connects muscle anchoring piece layout schematic diagram;

Fig. 4 is that the heat property lost dilatation joint of the present invention is arranged and arch angle collar tie beam structural representation;

Fig. 5 is a drying out curve schematic diagram of the present invention.

Mark among the figure: 1, spherical vault; 2, central angle; 3, electrode hole; 4, charging aperture; 5, thermometric pressure tap; 6, the first ring template on ball top; 7, the second ring template on ball top; 8, ball top center die plates; 9, anchoring piece; 10, the heat property lost dilatation joint; 11, electric steel shell; 12, fibrofelt; 13, anchoring piece connects muscle; 14, anchoring piece; 15, water material feeding; 16, electrode hole; 17, charging aperture; 18, furnace lining.

The specific embodiment

As shown in Figure 1 and Figure 2, press rational central angle 2 of electric furnace type and power selection and keeper electrode hole 3, charging aperture 4.

As shown in Figure 3, Figure 4, vault is taked the cast of branch ring piecemeal, thickness 350mm, and electrode circle center thickness 450mm is linked to be an integral body with anchoring piece 9 between piece and the piece.

3000KVA electric furnace vault is divided into 3 21 on rings pours into a mould, accurately control center of circle angle.

Vault internal mold outer surface requires smooth smooth, finishes line and accomplishes that tangent plane is vertical by the cast piecemeal in advance.

Every template central longitudinal is provided with the heat property lost dilatation joint to interruption, the glued board of material employing≤3mm, reserve 3 80 * 300mm on the every template, be vertically fixed on after the internal mold upper pouring demoulding baker and promptly form to be interrupted and heat is set loses property demiinflation seam, center circle in reserve one in the heart.

The company's of setting muscle anchoring piece between every ring and the ring, the time spent need be brushed the pitch prill lacquer twice, is fixed between the two ring templates, guarantees to imbed in the cast bed of material by design height.

Furnace roof electrode hole cavity portion is integrated poured, can not piecemeal.Second circle be divided into several suitable, on-the-spot determine.

Furnace roof middle part generally thickens to 450mm, and the accident to furnace roof when beating open arc and change oxidizing atmosphere or stove malleation towards the slope with the opposing electrode corrodes.

Construction and maintenance, furnace drying method:

1. pour into a mould water and be clean domestic water, pH value 6-8;

Environment temperature when 2. pouring into a mould should be controlled at 5～35 ℃ of scopes;

3. all holes all will be carried out loose tool and carry out and reserve by size before the cast;

4. before watering the material feeding use, sack is sealed take apart earlier, the pouch bond is poured in the sack, sack integral body is poured in the mixer again, siccative stirs after 3 minutes and adds water, and amount of water is as the criterion with given numerical value in the quality guarantee list.Add to stir again behind the water and can discharging pour into a mould in 5 minutes;

5. the wet feed that stirs should 40 minutes with the interior wooden model internal vibration moulding of packing into, remainingly water material feeding and should must not use again by waste disposal;

6. in casting process shock club want slow-motion, go out slowly, evenly vibrations, avoid occurring shaking and the leakage situation of shaking;

7. arch springing beam casting complete is answered after the natural curing 48 hours, again formwork cast furnace roof;

8. the furnace roof casting complete got final product the demoulding in 36 hours, and natural curing can begin baker in 48 hours again.

As shown in Figure 5, baker is undertaken by curve, and carries out record, and its furnace drying method is as follows:

150 ℃ continue 8 hours, and 300 ℃ continue 32 hours, and 450 ℃ continue 16 hours, and 550 ℃ continue 16 hours, and 700 ℃ continue 16 hours, and 850 ℃ continue 16 hours, and 1000 ℃ continue to the operation temperature.

Claims (1)

1. the integrated poured and maintenance process of a zinc metallurgy ore-smelting electric furnace dome, it is characterized in that: press electric furnace type and power selection central angle (2) and keeper electrode hole (3), charging aperture (4), vault is taked the cast of branch ring piecemeal, thickness 350mm, electrode circle center thickness 450mm, be linked to be an integral body with heat-resistance stainless steel anchoring piece (9) between piece and the piece, every template central longitudinal is provided with the heat property the lost dilatation joint (10) of 3 80 * 300mm to interruption, the glued board of the material employing≤3mm thickness of the heat property lost dilatation joint (10), be vertically fixed on internal mold top, cast back demoulding baker promptly forms to be interrupted the heat property lost demiinflation seam, its construction is set, maintenance and furnace drying method are as follows:

1. pour into a mould water and be clean domestic water, pH value 6-8;

Environment temperature when 2. pouring into a mould should be controlled at 5～35 ℃ of scopes;

3. all hole all will be undertaken and reserves by size by loose tool before the cast;

4. before watering the material feeding use, sack is sealed take apart earlier, the pouch bond is poured in the sack, again sack integral body is poured in the mixer, siccative stirs after 3 minutes and adds water, amount of water with quality guarantee single in given numerical value be as the criterion, add to stir again behind the water and can discharging pour into a mould in 5 minutes;

5. the wet feed that stirs should 40 minutes with the interior wooden model internal vibration moulding of packing into, remainingly water material feeding and should must not use again by waste disposal;

6. in casting process shock club want slow-motion, go out slowly, evenly vibrations, avoid occurring shaking and the leakage situation of shaking;

7. arch springing beam casting complete is answered after the natural curing 48 hours, again formwork cast furnace roof;

8. the furnace roof casting complete got final product the demoulding in 36 hours, and natural curing can begin baker in 48 hours again;

9. carry out in strict accordance with drying out curve, its furnace drying method is: 150 ℃ continue 8 hours, and 300 ℃ continue 32 hours, and 450 ℃ continue 16 hours, and 550 ℃ continue 16 hours, and 700 ℃ continue 16 hours, and 850 ℃ continue 16 hours, and 1000 ℃ continue to the operation temperature.

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