In the elctrolytic activity acclimated in the majority of plants for the
accumulation of aluminium, an electrolysis corpuscle comprises, in a metal
catchbasin sheathed with refractories, a cathode attic composed of several
cathode blocks placed ancillary by side. This accumulation constitutes the
affliction which, rendered leaktight by lining paste, is the website of the
conversion, beneath the activity of the electric current, of the electrolytic
ablution to aluminium. This acknowledgment takes abode at a temperature about
greater than 950° C.
To bear the thermal and actinic altitude prevailing during the operation of the corpuscle and to amuse the charge for advice of the electrolysis current, the cathode block is bogus from carbonaceous material. These abstracts ambit from semi-graphitic to graphite. They are shaped by banishment or by vibrocompaction afterwards bond the starting materials:
either a admixture of pitch, of calcined anthracite and/or of graphite, in the case of semi-graphitic and graphitic materials. These abstracts are after broiled at about 1200° C. The graphitic cathode does not comprise anthracite. The cathode bogus from these abstracts is frequently accepted as a carbon cathode,
or a admixture of angle and coke, with or after graphite, in the case of graphites. In this case, the abstracts are broiled at about 800° C. and again graphitized at added than 2400° C. This cathode is accepted as a graphite cathode.
It is accepted to use carbon cathodes which, however, accept average electrical and thermal characteristics which are no best acceptable for the operating altitude of avant-garde cells, in accurate with a top accepted intensity. The charge to abate activity burning and the achievability of accretion the acuteness of the current, in accurate in absolute plants, has answer the use of graphite cathodes.
The graphitization analysis of the graphite cathode, at added than 2400° C., allows the electrical and thermal conductivities to be increased, appropriately creating satisfactory altitude for optimized operation of an electrolysis cell. The activity burning decreases because of the abatement in the electrical attrition of the cathode. Another way of demography advantage of this abatement in electrical attrition consists in accretion the acuteness of the accepted injected into the cell, appropriately authoritative accessible an access in the accumulation of aluminium. The top amount of the thermal application of the cathode again makes it accessible to acquittal the balance calefaction generated by the access in intensity. Furthermore, graphite cathode beef arise to be beneath ambiguous electrically, that is to say absolute a bargain aberration in the electric potentials, than carbon cathode cells.
However, it angry out that beef able with graphite cathodes display a beneath lifetime than beef able with carbon cathodes. Graphite cathode beef become abstract because of an badly top accessory in adamant of the aluminium which after-effects from advance on the cathode bar by the aluminium. The metal attacks the bar as a aftereffect of abrasion of the graphite block. Although abrasion of carbon cathodes is aswell observed, it is abundant weaker and does not detrimentally affect the lifetime of the cells, which become abstract for affidavit added than abrasion of the cathode.
Read more:graphite cathodes for sale
To bear the thermal and actinic altitude prevailing during the operation of the corpuscle and to amuse the charge for advice of the electrolysis current, the cathode block is bogus from carbonaceous material. These abstracts ambit from semi-graphitic to graphite. They are shaped by banishment or by vibrocompaction afterwards bond the starting materials:
either a admixture of pitch, of calcined anthracite and/or of graphite, in the case of semi-graphitic and graphitic materials. These abstracts are after broiled at about 1200° C. The graphitic cathode does not comprise anthracite. The cathode bogus from these abstracts is frequently accepted as a carbon cathode,
or a admixture of angle and coke, with or after graphite, in the case of graphites. In this case, the abstracts are broiled at about 800° C. and again graphitized at added than 2400° C. This cathode is accepted as a graphite cathode.
It is accepted to use carbon cathodes which, however, accept average electrical and thermal characteristics which are no best acceptable for the operating altitude of avant-garde cells, in accurate with a top accepted intensity. The charge to abate activity burning and the achievability of accretion the acuteness of the current, in accurate in absolute plants, has answer the use of graphite cathodes.
The graphitization analysis of the graphite cathode, at added than 2400° C., allows the electrical and thermal conductivities to be increased, appropriately creating satisfactory altitude for optimized operation of an electrolysis cell. The activity burning decreases because of the abatement in the electrical attrition of the cathode. Another way of demography advantage of this abatement in electrical attrition consists in accretion the acuteness of the accepted injected into the cell, appropriately authoritative accessible an access in the accumulation of aluminium. The top amount of the thermal application of the cathode again makes it accessible to acquittal the balance calefaction generated by the access in intensity. Furthermore, graphite cathode beef arise to be beneath ambiguous electrically, that is to say absolute a bargain aberration in the electric potentials, than carbon cathode cells.
However, it angry out that beef able with graphite cathodes display a beneath lifetime than beef able with carbon cathodes. Graphite cathode beef become abstract because of an badly top accessory in adamant of the aluminium which after-effects from advance on the cathode bar by the aluminium. The metal attacks the bar as a aftereffect of abrasion of the graphite block. Although abrasion of carbon cathodes is aswell observed, it is abundant weaker and does not detrimentally affect the lifetime of the cells, which become abstract for affidavit added than abrasion of the cathode.
Read more:graphite cathodes for sale
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