Mitsui Minings & Melting Co., Ltd.

Nippon Mining & Metals Co., Ltd.

Kenji Haiki

Hiroshi Oda

Hiroshi Hata

Kazuhiko Motoba

Masatami Sakata

Kazuhiko Nishina

In order to remove fluorine from a zinc containing solution before zinc electro-refining in lower cost, fluorine is removed by adsorption from a zinc containing solution (leached solution) utilizing the character of the predetermined iron compound or zinc compound which can adsorb fluorine in an acid solution and desorb fluorine in an alkaline solution. The fluorine adsorbent/desorbent having adsorbed fluorine is treated in an alkaline solution, to desorb the fluorine. This makes it possible to regenerate the fluorine adsorbent/desorbent. Further, an electrolytic solution for zinc electro-refining can be prepared in lower cost, thus total zinc refining costs can be reduced.

Fluorine adsorbent/desorbent applicable in electrolytic solution for zinc electro-refining and method for removing fluorine using the fluorine adsorbent/desorbent

Method for removing fluorine using a fluorine adsorbent/desorbent

In a metal-winning method, copper ore or copper-ore concentrates is effectively hydraulically leached in a chloride leach liquor and the resultant leached liquor is diaphragm-electrolyzed. A chloride electrolyte containing Brions and the leached metals is subjected to a diaphragm-electrolysis in an electrolytic cell comprising an anode compartment () and a cathode compartment (). A portion of the electrolyte in the anode compartment () is withdrawn from below an anode () of the anode compartment () and is returned to the leaching step so as to increase the oxidation potential of the chloride leach liquor.

Electrolytic method in diaphragm-type cell

A method of producing high purity electrolytic copper through halide-bath electrowinning is provided. The method includes the steps of: growing copper in dendritic form to be deposited on a cathode; and recovering growth ends of 3.0 mm or shorter from the dendrites.

High purity electrolytic copper and its production method

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Tokyo, Japan

Kenji Haiki