CN108301023A

CN108301023A - A kind of online minor repair method of 300/380KA large-scale pre-baked cells

Info

Publication number: CN108301023A
Application number: CN201810382929.3A
Authority: CN
Inventors: 张帝
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-04-26
Filing date: 2018-04-26
Publication date: 2018-07-20

Abstract

The invention discloses a kind of online minor repair methods of 300/380KA large-scale pre-baked cells comprising when inner lining damage, Hong Lu nations or runout occurs in pre-baking tank side, does not stop in time to extract the anode carbon block of leak source under slot production status；Molten aluminum, electrolyte solution are contained in leak source periphery with the mixture of electrolyte and aluminium oxide；Cooling is blowed with compressed air on the outside of the pot shell leak source of pre-baking tank；Temperature is begun a clean up less than 150 DEG C on the inside of leak source, ensures that bottom is smooth, facade is straight；The material of remnants is cleaned out, with compressed air blowing cooling down, waits for that temperature is down to 100 DEG C and is laid with thickeners and pricks admittedly, builds side anode carbon block, side anode carbon block and pot shell centre tamping aluminium oxide by laying bricks or stones at the top of thickener；The anode carbon block of extraction is installed after roasting for 24 hours after repairing, you can.The present invention can in the shortest time do not stop slot production in the case of Rapid-Repair, prevent processing cause not in time molten aluminum large area leak, thrust bath circumference bus, influence the safe operation of electrolytic series.

Description

A kind of online minor repair method of 300/380KA large-scale pre-baked cells

Technical field

The present invention relates to the method for maintaining of aluminium electroloysis electrolytic cell, especially a kind of 300/380KA large-scale pre-baked cells are small online Repair method.

Background technology

During aluminum electrolysis, cause the reason of cell lining breakage very much, such as roasting and starting aluminum electrolytic cell And temperature gradient is excessive in operational process, bath temperature is unstable so that cathode inner lining locally generates internal stress and crack occurs, fall off； Cathode block thermally expands, contraction is mismatched after being heated and expanded；Current distribution is uneven；Metallic sodium passes through in interfacial reaction and cathode carbon Lining forms stable inlay compound, since its lattice causes cathode carbon liner locally to expand more than carbon lattice size, production Raw internal stress, leads to cathode carbon inner lining damage；Metallic aluminium is generated with carbon effect at high temperature, generates chemistry and electrochemical corrosion, Keep cathode carbon liner impaired etc., but stop slot repairing because of electrolytic cell side runout and lost for enterprise too greatly.

Invention content

The technical problem to be solved by the present invention is in view of the shortcomings of the prior art, provide a kind of in the feelings for not stopping slot production The online minor repair method of 300/380KA large-scale pre-baked cells of Rapid-Repair is carried out under condition.

In order to solve the above technical problems, the technical solution adopted by the present invention is：A kind of 300/380KA large-scale pre-baked cells are online Minor repair method comprising following steps：

1) when finding that inner lining damage, Hong Lu nations or runout occurs in pre-baking tank side, in the case where pre-baking tank does not stop slot production status, Two pieces of anode carbon blocks of leak source are extracted rapidly；

2) molten aluminum, electrolyte solution are contained in leak source periphery with the mixture of electrolyte and aluminium oxide, skirt is stifled when containing While mixture is sturdy；

3) cooling is blowed with compressed air on the outside of the pot shell leak source of pre-baking tank；

4) it is begun a clean up when temperature is less than 150 DEG C on the inside of leak source, must assure that bottom is smooth when cleaning on the inside of leak source, facade It is straight；

5) heels is cleaned out after cleaning on the inside of funnel, with compressed air blowing cooling down, waits for that temperature is down to 90- It is laid at 100 DEG C and pricks solid paste, and according to 1：1.6 compression ratio prick admittedly, and portion is pasted over admittedly in bundle after the solid paste bundle of bundle is admittedly smooth Build the side wall carbon block processed by laying bricks or stones, separately by design drawing requirement prick solid paste prick it is solid it is artificial stretch one's legs, in side wall carbon block and pot shell Between consolidated with aluminium oxide；

6) one piece of anode carbon block of extraction is installed after roasting for 24 hours after repairing, another piece of anode carbon is installed after 48h Block, you can.

Said program is further improved as the crust breaking head of the middle overhead traveling crane of step 2) is sturdy by mixture.

The characteristics of pre-baking tank of the present invention online minor repair method and advantage are as follows：

1, construction is simple, it is easily operated.

2, in the shortest time do not stop slot production in the case of Rapid-Repair.

3, it prevents molten aluminum large area from leaking and thrusting bath circumference bus, influences the safe operation of serial pre-baking tank.

4, the cost of repairs is saved, about 3000~7000 yuan/platform of online light maintenance expense (according to the area repaired) stops slot light maintenance Expense, about 39.8 ten thousand yuan of the direct cost that cleaning, runout point dig clearly, replace side wall carbon block, roasting and starting etc. out of electrolytic cell/ Platform, whole 1,210,000 yuan of overhaul cost.

5, it by the online service life for repairing extension electrolytic cell of large-scale pre-baked cell, reduces and repairs the frequency, reduce industry Waste disposal, environmental protection.

6, the fuel cost and slot cleaning up cost stopped roasting again during slot is repaired and generated are reduced, it is energy saving.

7, steady production is kept, smoothly production provides safeguard for aluminium electrolysis enterprise.

The technology of the present invention places under repair suitable for aluminium electroloysis enterprise large-scale pre-baked cell in the case where not stopping slot, can reduce by Aluminium yield during the entirety for stopping slot repairing and generation clears up, roasts and stop slot etc. expense.The technology is to improve electrolytic cell Service life and a kind of most simple, the easy-operating practical approach for preventing early damage, can not only obtain good economic benefit And social benefit, and be suitble to promote the use of in large-scale pre-baked cell and small pre-calcining slot.

Description of the drawings

Fig. 1 is the Fe changes of contents curve graphs after 2139# pre-baking tanks repair.

Specific implementation mode

Embodiment 1：There is unbalanced sedimentation in certain aluminium electroloysis work area ground, and the sides the aluminium inlet B sedimentation of 2139# pre-baking tanks is more Seriously, molten aluminum, electrolyte roll the tiltedly hornblock of the sides extruding B and adjustment block to aluminium inlet B and cause pre-baking tank groove body in pre-baking tank Failure of insulation, hornblock are connected to conduction with the pot shell of pre-baking tank, and (in terms of clear plane scene, the pot shell of pre-baking tank goes out the breakdown of corner lateral mass Aluminium end B side corner sections contact surfaces have three vertical electric shock holes, diameter about 10mm.Puncture all graphite sides of position lateral mass Block, conductive effect are preferable) damage, causes pot shell damaged.

Include the following steps for the method to pre-baking tank rapid-maintenance, use：

It 1), rapidly will leakage in the case where pre-baking tank does not stop slot production status when finding that Hong Lu nations or runout occurs in pre-baking tank side Two pieces of anode carbon blocks at point are extracted；

2) molten aluminum, electrolyte solution are contained outside leak source with the mixture of electrolyte and aluminium oxide, skirt blocks up side when containing It is with the crust breaking head of overhead traveling crane that mixture is sturdy；

4) temperature is begun a clean up less than 150 DEG C on the inside of leak source, must assure that bottom is smooth when cleaning on the inside of leak source, and facade is flat Directly；

6) second piece of anode carbon block of extraction is installed after roasting for 24 hours after repairing, first piece of anode is installed after 48h Carbon block, you can.

Above-mentioned 2139# pre-baking tanks carry out after line repairing, and production run is normal, does not find slot side temperature rise, slot skill Art index is stablized, and it is as follows to measure every production and technical indication：

1,2139# pre-baking tanks in line from after repairing, the pre-baking tank primary aluminum stable quality, average content of iron 0.11 or so, 1-5 Month, iron content was up to 0.15 (electrolyte is higher to be caused), and silicone content is always held at 0.04 ﹪ (such as Fig. 1).

2,2139# pre-baked cell technologies condition：

From the point of view of technical conditions, the operation of 2139# pre-baking tanks is more steady, and current efficiency is high.

3,2139# pre-baking tanks groove body data cases：

2139# groove body data	Rod iron temperature	Steel sash temperature	Bottom temperature
				January	278	214	115
2 months	256	216	114
				March	263	235	123
April	277	261	121
				May	252	223	112

From the point of view of 1-5 month groove body data, nearby groove body temperature data is normal for repairing position.

Claims

1. a kind of online minor repair method of 300/380KA large-scale pre-baked cells, it is characterised in that include the following steps：

1) when finding that inner lining damage, Hong Lu nations or runout occurs in pre-baking tank side, in the case where pre-baking tank does not stop slot production status, rapidly Two pieces of anode carbon blocks of leak source are extracted；

2) molten aluminum, electrolyte solution are contained in leak source periphery with the mixture of electrolyte and aluminium oxide, the stifled side of skirt will when containing Mixture is sturdy；

4) it is begun a clean up when temperature is less than 150 DEG C on the inside of leak source, must assure that bottom is smooth when cleaning on the inside of leak source, facade is flat Directly；

5) heels is cleaned out after cleaning on the inside of funnel, with compressed air blowing cooling down, waits for that temperature is down to 90-100 DEG C when be laid with and prick solid paste, and according to 1：1.6 compression ratio prick admittedly, and in bundle, the portion of pasting over is built by laying bricks or stones admittedly after the solid paste bundle of bundle is admittedly smooth The side wall carbon block processed is separately stretched one's legs by the solid paste bundle of design drawing requirement bundle is admittedly artificial, is used among side wall carbon block and pot shell Aluminium oxide consolidates；

6) one piece of anode carbon block of extraction is installed after roasting for 24 hours after repairing, another piece of anode carbon block is installed after 48h, .

2. a kind of online minor repair method of 300/380KA large-scale pre-baked cells according to claim 1, which is characterized in that described The crust breaking head of the middle overhead traveling crane of step 2) is sturdy by mixture.

3. a kind of online minor repair method of 300/380KA large-scale pre-baked cells according to claim 1, which is characterized in that described Refer to that the side wall carbon block in leak source is removed on the inside of cleaning leak source.