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金属矿山 ›› 2020, Vol. 49 ›› Issue (04): 72-77.

• 矿物工程 • 上一篇    下一篇

草酸对锡石可浮性的影响及其作用机理研究

朱丽佳1 刘 杰1 郭珍旭2,3 吕 良2,3   

  1. 1. 东北大学资源与土木工程学院,辽宁 沈阳 110819;2. 自然资源部多金属矿综合利用评价重点实验室,河南 郑州 450000;3. 中国地质科学院郑州矿产综合利用研究所,河南 郑州 450000
  • 出版日期:2020-04-15 发布日期:2020-04-30
  • 基金资助:

    国家自然科学基金项目(编号:51674066,51774069,5197041089)。

Effect and Mechanism of Oxalic Acid on the Floatability of Cassiterite

Zhu Lijia1 Liu Jie1 Guo Zhenxu2,3 Lü Liang2,3   

  1. 1. School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China; 2. State Key Laboratory of Comprehensive Utilization Evaluation of Polymetallic Ore, Ministry of Natural Resources, Zhengzhou 450000, China; 3. Zhengzhou Institute of Comprehensive Utilization of Mineral Resources, Chinese Academy of Geological Sciences, Zhengzhou 450000, China
  • Online:2020-04-15 Published:2020-04-30

摘要: 为探究苯乙烯膦酸(SPA)捕收剂体系下作为脉石抑制剂的草酸对锡石可浮性的影响,进行了浮选试验,并利用溶液化学计算、动电位检测和红外光谱分析等手段探究其作用机理。在210时,锡石无法有效回收。根据锡石、萤石、方解石的浮选行为提出了锡石反浮选除杂的新思路。溶液化学计算、动电位检测和红外光谱分析表明草酸和SPA均能化学吸附于锡石表面,草酸在锡石表面生成了稳定的草酸锡络合物,草酸与SPA在锡石表面的吸附互相受到对方存在的影响。抑制机理解释为草酸在锡石表面的吸附增加了其亲水性同时占据了活性位点,从而抑制了锡石的浮选,研究结果为草酸对锡石浮选行为影响的机理提供了参考。

关键词: 锡石 , 苯乙烯膦酸 , 草酸, 浮选, 抑制

Abstract: The influence of oxalic acid on the floatation of cassiterite under the styrene phosphonic acid (SPA) collector system was investigated by flotation tests. Solution chemistry calculations, Zeta potential determination and infrared spectroscopy were used to explore its mechanism. The results of flotation experiments revealed that the recovery of cassiterite was above 79.37% in the pH value range of 2~10, with 80 mg/L SPA as the collector. After 4 mg/L of oxalic acid was added, the inhibitory effect of oxalic acid on cassiterite increased with increasing pH, and cassiterite could not be effectively recovered when the pH value was above 10. Based on the flotation behavior of cassiterite, fluorite and calcite, a new idea of reverse-flotation was proposed. Solution chemical calculation, Zeta potential measurement and infrared spectrum analysis demonstrated that both oxalic acid and SPA could chemically adsorb on the surface of cassiterite. Oxalic acid formed a stable tin oxalate complex on the surface of cassiterite, the adsorption of the two kinds reagents was affected by each other's existence. The inhibition mechanism is explained as the adsorption of oxalic acid on the surface of cassiterite increases its hydrophilicity and occupies active sites. This article provides a reference for the mechanism of the influence of inhibitors on cassiterite flotation behavior. 

Key words: Cassiterite, Styrene phosphonic acid, Oxalic acid, Flotation, Inhibition