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过程工程学报 ›› 2020, Vol. 20 ›› Issue (8): 938-946.DOI: 10.12034/j.issn.1009-606X.219288

• 反应与分离 • 上一篇    下一篇

云南某富银锌精矿锌银浮选分离实验研究

黎 洁1,2,3, 纪翠翠1,2,3*, 谢 贤1,2,3, 康博文1,2,3, 范培强1,2,3   

  1. 1. 昆明理工大学国土资源工程学院,云南 昆明 650093 2. 省部共建复杂有色金属资源清洁利用国家重点实验室,云南 昆明 650093 3. 云南省金属矿尾矿资源二次利用工程研究中心,云南 昆明 650093
  • 收稿日期:2019-08-26 修回日期:2020-01-03 出版日期:2020-08-24 发布日期:2020-08-24
  • 通讯作者: 纪翠翠

Experimental study on separation of zinc and silver flotation from a silver-rich zinc concentrate in Yunnan

Jie LI1,2,3, Cuicui JI1,2,3*, Xian XIE1,2,3, Bowen KANG1,2,3, Peiqiang FAN1,2,3   

  1. 1. Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China 2. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming, Yunnan 650093, China 3. Yunnan Province Engineering Research Center for Reutilization of Metal Tailings Resources, Kunming, Yunnan 650093, China
  • Received:2019-08-26 Revised:2020-01-03 Online:2020-08-24 Published:2020-08-24

摘要: 云南某富银锌精矿中银主要以类质同象形式存在于白铅矿中,本工作以该矿样为研究对象,根据其性质,采用抑铅浮锌的工艺流程进行浮选,考察了磨矿细度、抑制剂、活化剂及捕收剂等因素对浮选分离指标的影响。结果表明,–19+10 μm粒级中银含量最高。在磨矿细度–74 μm占90%,硅酸钠用量为2000 g/t,硫酸铜用量为200 g/t,丁基黄药用量为300 g/t,松醇油用量为30 g/t的条件下,1次粗选、1次精选、1次扫选,中矿顺序返回的全流程闭路实验,可获得含锌61.08%,回收率95.89%的锌精矿和含银1548.32 g/t,回收率为71.17%的银精矿,实现了锌银的浮选分离及伴生银的高效富集。

关键词: 锌精矿, 水力分析, 抑铅浮锌, 锌银分离

Abstract: Silver is a rare and precious metal with excellent performance and wide applicability, and is a dominant element in the national economy. Among the abundant silver mineral resources in China, associated silver reserves account for 88% of total silver reserves. Due to the pro-lead and pro-zinc nature of silver, associated silver is mainly hosted in deposits dominated by lead and zinc. For the comprehensive recovery of associated silver in lead-zinc ores, the traditional process mostly uses lead flotation and zinc suppression approaches to recover lead and zinc main metal minerals under high alkali, as well as enrichment of silver minerals in lead concentrates or zinc concentrates. However, the associated silver minerals in the high alkali process are easily inhibited and the losses are severe. Furthermore, the recovery rate of China's associated silver can only reach 60%~70%, while foreign countries generally reach 70%~80%. A silver-rich zinc concentrate in Yunnan mainly contains sphalerite, pyrite, galena, and cerussite; silver exists in cerussite in the form of isomorphism. According to the properties of ore samples, the technological process of lead flotation and zinc suppression was determined in a preliminary manner. Hydraulic analyses found that the highest silver content is present in particles with size –19+10 μm. On this basis, the effects of grinding fineness, inhibitors, activators, and collectors on flotation separation indexes were investigated. The results showed that the dosage of Na2SiO3, CuSO4, butyl xanthate, and terpenic oil were 2000, 200, 300, and 30 g/t, respectively. Furthermore, through a roughing, scavenging, cleaning, full-process closed-circuit experiment, it was possible to obtain a zinc concentrate with Zn grade of 61.08% and recovery rate of 95.89%, and a silver concentrate with Ag grade of 1548.32 g/t and recovery rate of 71.17%. In this way, flotation separation of zinc and silver was achieved, and the efficient enrichment of associated silver was obtained.

Key words: zinc concentrate, hydraulic analysis, lead flotation and zinc suppression, separation of zinc and silver