TREATMENT OF INTERMEDIATE PRODUCT OF SMELTING

• Main Authors: HASEGAWA NOZOMI, SHIBAZAKI TAKEYOSHI
• Format: Patent
• Language: English
• Published: 01.02.1994
• Edition: 5
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; FERROUS OR NON-FERROUS ALLOYS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PURPOSE:To enable the economical treatment of the intermediate product of smelting by sending a leaching liquid to a neutralizing stage, adjusting this liquid to specific pH and integrally settling and separating arsenic and copper. CONSTITUTION:The intermediate product of smelting consisting of acid soluble metal groups contg. at least the arsenic and cadmium and the copper is subjected to a leaching treatment with the acidity of sulfuric acid. The leaching liquid obtd. in such a manner is sent to a neutralizing stage and is adjusted to >=4.5 and <=6pH, by which the arsenic and copper are integrally settled and separated. The amt. of the arsenic contained in the liquid to be subjected to the neutralization treatment is specified to a range of (molar number of the arsenic) <=1/2 (molar number of the copper)+(molar number of iron). Hydrogen sulfide, sodium hydrogensulfide or zinc powder is added to the liquid obtd. after the settlement and sepn. of the arsenic and copper, by which the cadmium is settled and separated. As a result, the copper is economically recovered.