Pretreatment method of precious metal smelting slag

• Main Authors: PENG GUOMIN, WANG SHEGU, LEI MING, ZHANG FUYUAN
• Format: Patent
• Language: Chinese; English
• Published: 26.11.2014
• 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

The invention provides a pretreatment method of precious metal smelting slag. The method comprises the following steps: a) after a certain amount of water is added into an acid-resistant reaction vessel, the acid-resistant reaction vessel is opened and stirring is conducted; acid is added to adjust pH value of the solution to the range of 0.5-6.0; precious metal smelting slag which has undergone simple crushing is added and the addition amount is based on the liquid-solid weight ratio of 2:1-25:1; after uniformly stirring, a high-efficiency catalyst is added and the addition amount is 0.10-5.0% of the weight of the slag; and b) high-efficiency catalyzed leaching is carried out at 25-95 DEG C for 30-180 min, and solid-liquid separation is carried out after leaching so as to obtain leaching slag and leaching liquor. By the method, impurities in melting slag can be removed efficiently and precious metals such as gold, silver, platinum, palladium and the like in slag are enriched efficiently. In addition, the tec