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AssigneeDowa Mining Co., Ltd.
InventorsKishio Tayama, Shunichi Kimura
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In a purification apparatus comprising a vertical stack of a feed heating zone having the feed crucible 1, a condensation zone having a plurality of condensation vapor passage plates 5, a solidification zone having a solidification crucible 2 and an entrapment/solidification zone having a plurality of entrapment/solidification vapor passage plates 7, a feed metal, preferably with a purity of at least 3N, is charged into the feed crucible 1 in a vacuum atmosphere, preferably at no more than 13 Pa (10−1 Torr), with the feed crucible 1 and the condensation vapor passage plates 5 being heated at controlled temperatures to generate the vapor of the metal in the feed heating zone; part of the metal vapor is condensed to form a molten condensate which is returned into the feed crucible 1, thereby; the process solidifying the high-purity metal in the solidification zone; the solidified metal has a purity of at least 6N and contains Cl, F and S in a respective amount of no more than 0.1 ppm with a total impurity content of no more than 1 ppm.
A high-purity metal containing Cl, F and S in a respective amount of no more than 0.1 ppm, with the total impurity content being no more than 1 ppm.
A process for metal purification comprising a first step for heating a feed metal in a feed crucible to generate the vapor of said metal, a second step for directing said vapor into a condensation passageway for vapors, where part of the vapor is condensed to generate a molten condensate, and a third step for directing said vapor through said condensation passageway for vapors into a solidification crucible so that it is cooled to get said metal in high-purity form to solidify from it.
An apparatus for metal purification comprising a vessel for creating a vacuum atmosphere, a feed heating zone with an open top that contains a feed crucible to be charged with a feed metal, a condensation zone on top of said feed heating zone in which condensation vapor passage plates that are each convex downwardly and provided with a vapor passage hole in a generally central area and condensation vapor passage plates 5 that are each convex upwardly and provided with a plurality of vapor passage holes in the non-central area alternate with each other at given spacings and are stacked in general symmetry with respect to a plane, and a solidification zone on top of said condensation zone for solidifying said metal.
An apparatus for metal purification comprising a vessel for creating a vacuum atmosphere, a feed heating zone with an open top that contains a feed crucible to be charged with a feed metal to generate the vapor of said metal, a condensation zone with an open top and an open bottom communicating with the top of said feed heating zone and in which a plurality of condensation vapor passage plates that form a condensation passageway for vapors in which said vapor is allowed to pass upwardly only through the vapor passage holes made in said condensation vapor passage plates are stacked vertically at given spacings, and a solidification zone with an open top and an open bottom communicating with the top of said condensation zone and which contains a solidification crucible which is cooled externally so that said metal of high purity is solidified from said vapor after it has passed through said condensation zone, said plurality of condensation vapor passage plates being such that condensation vapor passage plates in the form of an inverted cone or dome which are each convex downwardly and provided with a vapor passage hole in a generally central area and condensation vapor passage plates in a conical or dome shape that are each convex upwardly and provided with a plurality of vapor passage holes in the non-central area alternate with each other and are stacked in general symmetry with respect to a plane, and a heater for heating said feed heating zone and said condensation zone being provided within or outside said vessel.
Dependencies are inferred from the claim text.