CN2122148U - Positive electrode protective ring for pre-baking bositive electrode al electrolytic tank - Google Patents

Abstract

The utility model relates to a positive electrode protective ring for pre-baking positive electrode Al electrolytic tank, which can provide a protective ring for the anode steel claws of the pre-baking positive electrode Al electrolytic tank. The ring is made of carbon materials, the shape of the ring are two semi-circular rings, which are sheathed on the steel claws above the carbon anode, two semi-circular rings are glued with carbon gel and seamed into a domain. By adopting the positive electrode protective ring for pre-baking positive electrode Al electrolytic tank, the carbon anode stub rate can be reduced from 36-40% to 20%. In a pre-baking tank production plant with annual production of 100 thousand tons aluminium, the annual reducible stub quantity of the carbon anode can be about 11.5 thousand tons and the saved capital can be nearly about 1.36 million yuan after the production plant entirely adopting steel claw protective rings.

Description

Positive electrode protective ring for pre-baking bositive electrode Al electrolytic tank

The utility model belongs to metallurgy of aluminium technical field, is specially adapted to prebaked cell for aluminum-reduction.

In the prior art, the anode conducting system of prebaked cell for aluminum-reduction is (3) three parts of guide rod (1), steel pawl (2), carbon anode among Fig. 1 (the assembling front view of prebaked anode prior art).Steel pawl and carbon anode be combined into ferrophosphorus casting (4), the steel pawl is in the charcoal bowl about 80～100mm(a).Carbon anode will constantly consume in electrolytic process, descend, and when waiting to reach capacity height (b), just needs to change.According to reason, the anode scrap limiting altitude of carbon anode should be apart from anode steel jaw lower end 10～20mm, just 90～120mm(b).Yet, in actual production process,, often will change carbon anode at the height (c) of 200～210mm owing to will avoid of the etch and the scorification of ionogen fused salt to the steel pawl, residual anode ratio is up to 36～40%.The anode scrap that changes returns production line again.Obviously, anode scrap is big more, can make cost high more, but also can increase the energy consumption of electrolysis production.

The purpose of this utility model provides a kind of guard ring, is enclosed within on the anode steel jaw, and protection steel pawl is not subjected to ionogen etch and fusing, thereby prolongs anode work-ing life, reduces residual anode ratio.

The utility model adopts the carbon material of the molten salt electrolyte of anti-fluorine etch; make two semicircular rings (Fig. 3 the utility model guard ring semicircular ring stereographic map) of internal diameter Φ 100～180mm, external diameter Φ 200～300mm, high 60～120mm according to steel pawl diameter; be enclosed within on the above steel pawl of Fig. 2 (the assembling front view of the utility model prebaked anode technology) carbon anode (5); form a domain with charcoal is gluing then, the steel pawl is played a protective role.

The used carbon material of the utility model is after-smithing petroleum coke or hard coal, graphite, after fragmentation, screening, according to＞4mm grade＜2% weight ,+4～2mm grade, 25 ± 2% weight ,-2～1mm grade, 15 ± 2% weight,＜0.075mm grade 35 ± 3% weight ,-1～0.075mm grade is that surplus is made into aggregate, add in the aggregate with pitch 15 ± 1% weight, mix pinch in the pot stir, mixedly pinch, then with extrusion machine or vibrating forming machine at in-mold molding, place stoving oven to form with 1000 ℃ of high-temperature roastings.Each (two semicircular ring) heavily about 4～5kg of the guard ring of making, ultimate compression strength＞20Mpa, bulk specific weight＞1.45kg/cm ³, ashes＜1.0% is than resistance 75 Ω cm.

The used charcoal glue of the utility model is furfuryl alcohol resin 30～60% weight, and all the other are graphous graphite powder, and solidifying agent is hydrochloric acid 4～10% weight, sulfuric acid+ethanol 4～10% weight.At normal temperatures, solidifying agent and furfuryl alcohol resin be mixed in proportion stir evenly, add Graphite Powder 99 then, continue to be stirred to evenly.

Description of drawings:

Fig. 1 is the assembling front view of prebaked anode prior art.

Fig. 2 is the assembling front view of the utility model prebaked anode technology.

Fig. 3 is the utility model guard ring semicircular ring stereographic map.

Adopt steel claw protection ring, the residual anode ratio of carbon anode is reduced to about 20%, reach and, prolong carbon anode and used fate about 4～7 days near limit anode scrap.Carbon anode is pressed 12～14kg for every centimeter and is calculated, and anode scrap weight is reduced about about 130kg, promptly can save 130kg charcoal piece with the carbon steel claw protection ring of 15kg.

After producing the prebaked cell factory of 100,000 tons of aluminium ingots per year, all adopting steel claw protection ring, can reduce about 1.15 ten thousand tons of anode scrap amount every year, 0.11 ten thousand ton of deduction guard ring materials can be saved nearly 1,360 ten thousand yuan every year.Residual anode ratio reduces the consumption that also significantly reduces labor strength and reduce electric energy in the electrolytic process.

Claims (2)

1, a kind ofly forms the anode protection ring of the prebaked cell for aluminum-reduction of anode conducting system, it is characterized in that guard ring of outer cover of the steel pawl more than carbon anode by carbon anode, steel pawl, guide rod.

2, the anode protection ring of prebaked cell for aluminum-reduction according to claim 1 is characterized in that this guard ring made by carbon material, and it is shaped as two semicircular rings, is enclosed within on the steel pawl again with the gluing domain of forming of charcoal.

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