东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2011, Vol. 32 ›› Issue (11): 1599-1602.DOI: -

• 论著 • 上一篇    下一篇

难处理金矿浸出预处理过程的电位-pH图

金创石;张廷安;牟望重;曾勇;   

  1. 东北大学多金属共生矿生态化利用教育部重点实验室;金策工业综合大学物理化学教研室;
  • 收稿日期:2013-06-19 修回日期:2013-06-19 发布日期:2013-04-04
  • 通讯作者: -
  • 作者简介:-
  • 基金资助:
    国家“十一五”科技支撑计划项目(2008BAB34B01);;

E-pH diagram of pretreatment of leaching for refractory gold ore

Kim, Chang-Sok (1); Zhang, Ting-An (1); Mu, Wang-Zhong (1); Zeng, Yong (1)   

  1. (1) Key Laboratory of Ecological Utilization of Multi-metal Intergrown Ores, Ministry of Education, Northeastern University, Shenyang 110819, China; (2) Department of Physical Chemistry, Kimchak University of Technology, Pyongyang 999093, Korea, People's Democratic Rep
  • Received:2013-06-19 Revised:2013-06-19 Published:2013-04-04
  • Contact: Zhang, T.-A.
  • About author:-
  • Supported by:
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摘要： 通过热力学计算绘制了298.15 K下FeS2-H2O系、FeAsS-H2O系的电位-pH图,为难处理金矿浸出预处理过程中黄铁矿与毒砂的氧化分解提供了热力学依据.由FeS2-H2O系的电位-pH图可知,黄铁矿可以被O2等氧化剂氧化分解.在水的稳定区范围内,元素硫的稳定区较小,浸出预处理过程中硫基本上以HSO-4,SO24-形式存在.由FeAsS-H2O系的电位-pH图可知,毒砂比黄铁矿更容易被氧化分解.浸出预处理过程应提高氧化电位使毒砂中的砷和硫氧化至最高价脱去,避免亚砷酸盐和元素硫的生成.以难处理金精矿为原料进行加压氧化验证实验,在反应温度180℃、精矿粒度为-0.075 mm~+0.061...

关键词: 难处理金矿, 预处理, 电位-pH图, 黄铁矿, 毒砂

Abstract: E-pH diagrams of FeS2-H2O system and FeAsS-H2O system at 298.15 K were drawn to provide the thermodynamic basis for the pretreatment of pyrite and arsenopyrite before leaching. According to E-pH diagram of FeS2-H2O system, pyrite can be decomposed by O2 and other oxidants. The stable region of sulfur element is small and sulfur exists as HSO4- and SO42- basically in the stable region of water. According to E-pH diagram of FeAsS-H2O system, the decomposition of arsenopyrite is easier than pyrite. Oxidation potential was improved to oxidize sulfur and arsenic to be removed and avoid the formation of arsenite and sulfur elements during the pretreatment process. Verification of pressure oxidation was carried out with refractory gold ore. When the temperature, concentrate particle size, oxygen partial pressure, initial acid concentration, liquid-solid mass ratio, reaction time and stirring speed are 180°C, -0.075~+0.061 mm, 0.8 MPa, 60 g/L, 4:1, 120 min and 600 r/min respectively, average desulfurization rate is 93.85% and average arsenic removal rate is 95.91%. The experiment results are in good agreement with the calculation results of E-pH diagram.

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