Process for recovery of aluminum from carbonaceous waste product

Details Process for recovery of aluminum from carbonaceous waste product Process for recovery of aluminum from carbonaceous waste product

1982-01-20

1984-03-13

Andrews, M. J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 24, 75 68R, 106117, 204 67, C22B 2102

Patent

active

044365500

ABSTRACT:
A carbonaceous waste product, preferably containing 30 to 60% mineral substances, 35 to 55% carbonaceous materials, 5 to 20% water, and having a calorific value of 2,000 to 3,500 k cal/kg is fired to produce thermal energy and a combustion residue. The residue is adjusted, if necessary, by addition of mineral containing additives so that it contains 15 to 50% alumina, 15 to 20% silica and 13 to 45% other oxides (mainly iron oxide, manganese oxide and calcium oxide). Sufficient limestone is added to produce a mixture containing 1.8 to 2.2 moles of calcium oxide per mole of silica and 1.1 to 1.3 moles of calcium oxide per mole of alumina. The mixture is then sintered. The total energy requirements of the sintering step are supplied by the energy generated in the firing step. Useful products such as cement and cast stone can be produced from the sintered product.

REFERENCES:
patent: 1815888 (1931-07-01), Baily
patent: 3853535 (1974-12-01), Szabo et al.

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