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Process for recovering silver, copper, and stainless steel from silver brazed stainless steel sections.

Authors
Dunning BW Jr.; Chambers DH
Source
U.S. Pat. 4,090,935 1978 May; :1-8
NIOSHTIC No.
10011919
Abstract
An electrolytic refining process is used for recovering ag, cu, and stainless steel from stainless steel honeycomb sections from military aircraft brazed with ag-base alloys. The brazed sections consist of ag 5-30, cu 2-15 wt pct, and the balance stainless steel. Thus, ag-brazed stainless steel aileron sections were sheared, shredded, and screened. The anode basket was filled with +30 mesh pieces. The electrolytic refining cell contained the anode basket, which was enclosed by a cylindrical sheet stainless steel cathode. The cell contained an electrolyte solution of copper nitrate and silver nitrate. The refining was carried out at 30 a d.C. and 0.1- 5.0 V. The anode basket was rotated at 0.5-5 Rpm. The deposited ag was scraped, washed, dried, and magnetically separated from possible stainless steel fines. The resulting ag was 95-99 pct pure and was further purified. The stainless steel in the anode basket was washed and dried. The copper nitrate solution was used as the electrolyte in a refining cell, and cu was deposited on the cathode. The anode mud consisted of stainless steel and possibly pd and ag.
Publication Date
19780523
Document Type
Patent
Fiscal Year
1978
Identifying No.
PAT 4,090,935
NIOSH Division
CPRC
Source Name
U.S. Pat. 4,090,935
State
DC; MD
Page last reviewed: September 17, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division