Method for inhibiting arsenic hydride gas during sulfuric acid leaching of high-arsenic-lead-zinc smoke dust

• Main Authors: LUO HENG, LIU XIAN, XIE FUHUA, YAN JIANYING, DENG HAIBO, ZHANG DIANBIN, DAI XINGZHENG, ZHANG MEI, JIN JIAQIANG, ZOU LIMING, QIANG ZHENHUA, LU ZHANQING, DONG TIEGUANG
• Format: Patent
• Language: Chinese; English
• Published: 03.07.2020
• 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 relates to a method for inhibiting arsenic hydride gas during sulfuric acid leaching of high-arsenic-lead-zinc smoke dust produced by a lead reduction furnace, and belongs to the technical field of nonferrous metallurgy. The method comprises the following steps that a secondary tuyere is formed in an ascending section of the reduction furnace, air is continuously blown in, and the oxygen content in flue gas is controlled, so that volatile arsenic, lead, zinc steam and other metal steam are oxidized, and the single mass of metal in the smoke dust is controlled; and the high-arsenic-lead-zinc smoke dust is pulped through using clear water, leaching is carried out through using only one section of weak acid, the concentration of added dilute acid, the leaching process and an endpoint pH value are controlled, and after solid-liquid separation is carried out on a leached ore pulp, zinc is recovered from a filtrate, and filter residues are returned to an intensified smelting furnace to recover lead. B