| 摘要 |
Highly shock-resistant carbon blocks used as anodes for aluminum production by the Hall-Heroult process are manufactured in a method involving an operation that consists in adjusting the size grain distribution of a carbon-containing aggregate. Manufacture of carbon blocks involves: (a) separating an initial carbon-containing aggregate (AC) into a first fraction (F1) consisting of grains whose size is less than X and into a second fraction F2 consisting of grains of size whose size is not less than X, where X = 0.2-2 mm, preferably 0.3-1 mm; (b) grinding (B1) the first fraction (F1) and part (P1) of the second fraction (F2), to obtain a powder (F) comprising a controlled proportion of ultrafine grains; (c) mixing the remaining part (P2) of fraction (F2) and the powder (F) in proportions for obtaining raw carbon blocks, where the ratio Gr/S between the proportion PGr of the grains of size above 0.3 mm and the proportion PS of grains of size 30 microns to 0.3 mm is at least 4, and where the density after baking is above 1.55. The initial carbon-containing aggregate (AS) can a run-of-mine aggregate. The aggregate can contain calcined petroleum coke having at least 35 % of grains with size less than 0.3 mm, and it may also contain up to 40 % of recycled carbonaceous products. Independent claims are given for: (i) utilization of the process for manufacturing carbon anodes for aluminum production by the Hall-Heroult process; and (ii) utilization of carbon anodes obtained by the above process for aluminum production by the Hall-Heroult process.
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