中南大学学报（自然科学版）2023，Vol.54Issue(12)：4640-4651,12.DOI:10.11817/j.issn.1672-7207.2023.12.004
银精矿预氧化及有价元素深度强化浸出行为研究
Preoxidation of silver concentrate and deep enhanced leaching behavior of valuable elements
摘要
Abstract
In view of the high recovery value of flotation silver concentrate and the shortcomings of existing treatment technology,the process route of concentrated sulfuric acid preoxidation and oxygen pressure acid leaching was put forward.Taking the flotation silver concentrate produced in zinc hydrometallurgy as the research object,the preoxidation mechanism of concentrated sulfuric acid,the change law of micro-morphology of preoxidized silver concentrate and the leaching behavior of Zn,Cu and In during oxygen pressure acid leaching were emphatically studied.The results show that under the conditions of concentrated sulfuric acid preoxidation temperature of 60℃,time of 15 h and acid-ore mass ratio of 0.6,the polar groups of P—O and—OH in flotation reagents are destroyed.The formation of hydration film and mineral inclusions caused by it is avoided,and the ability of mineral dissolution and leaching is improved.Increasing the reaction temperature,prolonging the reaction time and increasing the ratio of acid to mineral can promote the pre-oxidation reaction of concentrated sulfuric acid.However,when the ratio of acid to mineral exceeds 1.07,the pre-oxidized material is in a semi-fluid state and its viscosity increases,which is not conducive to the pre-oxidation process.Under the conditions of reaction temperature of 155℃,initial acidity of 160 g/L,reaction time of 180 min,oxygen partial pressure of 0.8 MPa and liquid-solid ratio of 7 mL/g,the leaching rates of Zn,Cu and In in pre-oxidized silver concentrate are 94.84%,98.36%and 91.13%,respectively,and the enrichment rates of lead and silver in leaching residue are 2.88%and 7 754 g/t,respectively,which realizes the deep leaching of Zn,Cu and In and the efficient enrichment of lead and silver.关键词
浮选银精矿/浓硫酸预氧化/水化作用/氧压酸浸/浸出率Key words
silver concentrate of flotation/preoxidation with concentrated sulfuric acid/hydration/oxygen pressure acid leaching/leaching rate分类
通用工业技术引用本文复制引用
刘强,李存兄,李倡纹,顾智辉,王启亮,宋健清,毛罗滨,成圳,王阳波..银精矿预氧化及有价元素深度强化浸出行为研究[J].中南大学学报（自然科学版）,2023,54(12):4640-4651,12.基金项目
国家自然科学基金资助项目(52064034) （52064034）
云南省重点研发计划项目(202202AB080005) （202202AB080005）
国家重点研发计划项目(2021YFC2902801)(Project(52064034)supported by the National Natural Science Foundation of China （2021YFC2902801）
Project(202202AB080005)supported by the Key R&D Program of Yunnan Province （202202AB080005）
Project(2021YFC2902801)supported by the National Key R&D Program) （2021YFC2902801）
