DE-LEADING TREATMENT METHOD FOR LEAD-CONTAINING COPPER ALLOY AND DE-LEADING CORED WIRE USED IN SAID METHOD

WIPO Patent Application WO/2017/081824

A1

Copper alloys such as brass or bronze, primarily rod-shaped products for which free-cutting is required, contain a certain amount of lead. From the past, scraps of said products have been re-used at a high rate. For recycled use of said product scraps for low-lead products, a lead removal step is indispensable and development of lead removal technology is imperative. For lead removal from copper alloys, materials containing metal element calcium are known to be effective. But because of differences in specific gravity and melting point between the de-leading agent and the copper alloy, a de-leading method that is practicable at a mass production level was desired. To solve said problem, the present invention is a de-leading cored wire for the purpose of de-leading treatment of a molten copper alloy metal, the cored wire being characterized in that: a metal band that does not affect components of the molten copper alloy metal is used as a sheath material; the content is a de-leading agent alone and/or an auxiliary de-leading agent such as a Pb-Ca compound flocculant/flotation reagent, etc. that is necessary in the process; and the cored wire has physical properties that can withstand mechanical and continuous feeding by a cored wire-feeding device.

JP4140471	Copper refining method
JP5518775	Iron / tin-containing copper treatment method

NOH ZANGSA (JP)

PCT/JP2015/082039

May 18, 2017

November 13, 2015

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WING ON (JAPAN) TRADING LTD (JP)
KUSAKA FOUNDRY SUPPLIES CO LTD (JP)

C22B15/14; C22B9/10

JP2006161136A	2006-06-22
JPH10140254A	1998-05-26

See also references of EP 3375896A4

TAKAHASHI Mitsuo et al. (JP)

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