PROCESS FOR ELECTROCHEMICAL DECOMPOSITION OF SUPERALLOYS

• Main Authors: MEESE MARKTSCHEFFEL JULIANE, STOLLER VIKTOR, ERB MICHAEL, OLBRICH ARMIN, MATHY WOLFGANG, NIETFELD GEORG, GILLE GERHARD
• Format: Patent
• Language: English; Korean
• Published: 22.05.2003
• Edition: 7
• Subjects: APPARATUS THEREFOR; CHEMISTRY; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; PRETREATMENT OF RAW MATERIALS; PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY ORREFINING OF METALS; PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROMOBJECTS; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PURPOSE: A process for recovery of valuable metals from superalloys by electrochemical decomposition is provided in which both electrodes are formed by the superalloy, and the polarity of the electrolysis current is reversed with a frequency of from 0.005 to 5 Hz. CONSTITUTION: The process for recovery of valuable metals from superalloys comprises the step of decomposing the superalloys electrochemically, wherein the superalloys are used both as the anode and as the cathode, and the polarity of the electrolysis current is reversed with a frequency of from 0.005 to 5 Hz, wherein the superalloy contains one or more of the metals Co, Ni, Cr or Al as major constituents and one or more of the elements Ta, Re, W, Mo, Hf or Pt as minor constituents, wherein the superalloy contains from 1 to 10 wt. % of Re, wherein the electrochemical decomposition is carried out with an electrolysis voltage of from 2 to 6 volts at a constant electrolysis current, wherein an inorganic acid is used as the electrolyte, wherein an oxygen free inorganic acid is used, and wherein as a result of the electrochemical decomposition, the elements Co, Ni, Cr and Al are obtained as salts dissolved in the electrolysis brine and the elements Ta, W, Hf and Pt are obtained as filterable oxides, so that essentially quantitative separation of the two element groups can be carried out by filtration of the electrolysis brine. 전기 화학적 분해에 의해 초합금으로부터 고가의 금속을 회수하기 위한 처리 방법이 설명되며, 양 전극은 초합금에 의해 형성되고 전해 전류의 극성은 0.005 내지 5 ㎐의 주파수로 반전된다.