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Method of removing lead, reclaimed metals and reclaimed products

A technology of metal halides and metal oxyhalides, applied in the field of refining pure metals or alloys, can solve the problems of difficult separation and removal of lead and tin, and achieve the effect of promoting recycling and high cost-effectiveness

Inactive Publication Date: 2010-06-16
TAMURA KAKEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In addition, in the electrolytic refining of lead, it is difficult to separate and remove lead and tin

Method used

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  • Method of removing lead, reclaimed metals and reclaimed products
  • Method of removing lead, reclaimed metals and reclaimed products
  • Method of removing lead, reclaimed metals and reclaimed products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Heat and melt 100 g of lead-free solder alloy containing high concentration of lead impurities (0.24%) at 300°C with an evaporating dish, add 5% tin chloride relative to the mass of lead-free solder alloy, and use a stainless steel stirring rod Stir and mix for 5 minutes for deleading treatment.

Embodiment 2

[0070] Heat and melt 100 g of lead-free solder alloy containing high concentration of lead impurities (0.24%) at 300°C with an evaporating dish, add 5% tin bromide relative to the mass of lead-free solder alloy, and use a stainless steel stirring rod Stir and mix for 5 minutes for deleading treatment.

Embodiment 3

[0072] Heat and melt 100 g of lead-free solder alloy containing high concentration of lead impurities (0.24%) at 300°C with an evaporating dish, add 5% copper chloride relative to the mass of lead-free solder alloy, and use a stainless steel stirring rod Stir and mix for 5 minutes for deleading treatment.

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Abstract

An object of the present invention is to provide an industrially excellent method for removing lead that is high in removal effect of lead, capable of implementing the removal even in small facilities and of suppressing capital investment cost. A material to be treated selected from the group consisting of a pure metal and an alloy is heated to obtain a melt. The melt is contacted with at least one of a metal halide and a metal oxyhalide to remove lead in the material to be treated.

Description

technical field [0001] The present invention relates to techniques for refining pure metals or alloys in order to promote efficient use of resources. Background technique [0002] When lead-containing solder is mainly used, the technology of removing impurities in order to obtain recycled solder targets Cu and Fe as the target impurities. For impurities such as Cu and Fe, there are the following removal methods: adding an element that forms a eutectic with a melting point higher than that of tin-lead solder, and removing the eutectic with floating Cu and Fe by using the difference in melting point and specific gravity (patent document 1). [0003] In addition, in electrolytic refining of lead, it is difficult to separate and remove lead and tin. For this reason, useful alkali compound is used to refine the cathode precipitate that obtains, then returns to the lead reduction furnace, reclaims the method (patent document 2) of lead content with crude lead. [0004] In addit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/10
CPCC22B7/002C22B13/06C22B9/05C22B25/08C22B13/025Y02P10/20Y10T428/31678
Inventor 栗田聪大野耐一田岛信男
Owner TAMURA KAKEN CO LTD