| 摘要 |
<p>Process for insolubilizing and consolidating in pellet form the spent linings from electrolysis cells for the production of aluminium comprising grinding said spent linings and mixing them thoroughly with various pulverulent refractory additives before heating, characterized in that after the addition of: a first additive intended to fix the alkali metals during firing, which is chosen from the group of aluminosilicates, and subsequently a second additive intended firstly to combine with the impregnating fluoride compounds during firing to form new stable, insoluble compounds, and secondly through its non-combined excess part to assure the consolidation of the mixture, and is chosen from the group of calcium oxides and salts, preferably limestone cements and mortars, the intimate mixture of ground, spent linings and said first and second pulverulent additives is agglomerated into pellet form before firing at a temperature in the range of from 700 DEG C. to 950 DEG C.</p> |
