Reinforced leaching method of copper smelting ash and application of method

• Main Authors: PAN RONGXUAN, WANG HESENG, YU YING, ZHANG JUN, ZHOU WENYI, QIAN JUNJIE, XIA ZHAOQUAN, FANG ZHILING, YANG YI, SHEN QIXIN, ZHOU MING
• Format: Patent
• Language: Chinese; English
• Published: 08.03.2019
• Subjects: CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses a reinforced leaching method of copper smelting ash and application of the method. The method comprises the following steps of 1, first-stage sulfuric acid leaching, wherein the copper smelting ash is subjected to primary leaching with sulfuric acid or second-stage leachate as a leaching agent to obtain leachate and leaching residues; 2, second-stage slurrying and oxidizingleaching, wherein the first-stage leaching residues are subjected to slurrying and oxidizing with sulfuric acid as a leaching agent and nitric acid as an oxidizing agent to obtain slurry; and 3, water leaching of the slurry, wherein a proper amount of water is added into the slurry, air is introduced to continue leaching, leached copper and zinc are effectively separated from leaching residues, and the second-stage leaching residues are filtered after being washed with water. The method has the beneficial effects that the ash high in copper sulphate content is treated, and the copper and zincleaching rate is high; le