METHOD AND DEVICE FOR THE RECOVERY OF LIQUID ALUMINUM BY COMPRESSION OF HOT SLAG

摘要

PCT No. PCT/FR84/00070 Sec. 371 Date Nov. 21, 1984 Sec. 102(e) Date Nov. 21, 1984 PCT Filed Mar. 20, 1984 PCT Pub. No. WO84/03719 PCT Pub. Date Sep. 27, 1984.The present invention relates to a process and apparatus for the recovery of liquid aluminium by compression of hot dross. The process comprises placing the dross in a die up to a height which depends on the diameter of said die and which is lower at the center than at the periphery of the die, and then applying to the dross a punch which is moved downwardly at a speed which is lower in proportion to a lower level of concentration of liquid aluminium in the dross. The apparatus comprises a cylindrical die (10) provided with an insert member at each of its ends. The die rests on a base (3) which has an annular groove (4) on its upper face; the lower insert member (7) is of a diameter that is at least equal to the inside diameter of the groove and in any case less than the outside diameter and has a continuous upper face of conical shape; the space (16) between the wall surface of said insert member and the internal wall surface of the die is of a constant width and is disposed facing the groove. The invention is used in the aluminium industry when there is a need to treat dross in an economical fashion and under good conditions in regard to health.