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中南大学学报(自然科学版)

Journal of Central South University

第45卷    第5期    总第237期    2014年5月

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文章编号:1672-7207(2014)05-1390-07
苛性碱溶液氧压浸出高砷锑烟尘
张旭,刘志宏,李玉虎,刘智勇,李启厚

(中南大学 冶金与环境学院,湖南 长沙,410083)

摘 要: 对苛性碱溶液氧压浸出高砷锑烟尘进行研究,考察NaOH浓度、O2分压、温度、浸出时间和液固质量比等因素对砷、锑和铅浸出行为的影响。研究结果表明:在火法处理铅阳极泥产出的高砷锑烟尘中,砷、锑的主要物相分别为As2O3和Sb2O3,锑也有少量以Sb2O5存在;在苛性碱溶液氧压浸出高砷锑烟尘过程中,As(Ⅲ)氧化为溶解度更大的As(Ⅴ)进入溶液,同时Sb(Ⅲ)氧化为Sb(Ⅴ),并形成难溶化合物Sb2O3?2Sb2O5、Pb2Sb2O7和NaSb(OH)6,进入浸出渣中;实验确定的最佳工艺条件为:NaOH质量浓度40 g/L,O2分压2.0 MPa,浸出温度140 ℃,浸出时间2 h,液固质量比10。在此条件下,As的浸出率可达95%以上,而Sb和Pb的浸出率均小于1.0%。

 

关键词: 高砷锑烟尘;氧压浸出;脱砷;苛性碱溶液

Oxygen pressure leaching of arsenic and antimony bearing flue dust in NaOH solution
ZHANG Xu, LIU Zhihong, LI Yuhu, LIU Zhiyong, LI Qihou

School of Metallurgy and Environment, Central South University, Changsha 410083, China

Abstract:The oxygen pressure leaching of arsenic and antimony bearing flue dust in NaOH solution was investigated and the effects of NaOH concentrate, O2 pressure, temperature, time and mass ratio of liquid to solid were evaluated experimentally. The results show that the main phases of arsenic and antimony in the flue dust produced in the pyrometallurgical treatment of anode slime of lead electrorefining are As2O3 and Sb2O3 separately, with a small amount of antimony also being in the form of Sb2O5. In the process of the oxygen pressure leaching of arsenic and antimony bearing flue dust in NaOH solution, As(Ⅲ) ions are oxidized into As(Ⅴ) with a higher dissolubility in alkaline solution in the leaching process, while Sb(Ⅲ) ions are also oxidized into Sb(Ⅴ) and precipitated into leach residue in the form of Sb2O3?2Sb2O5, Pb2Sb2O7 and NaSb(OH)6. The optimum condition of the leaching is determined to be as follows: NaOH concentrate of 40 g/L, O2 partial pressure of 2.0 MPa, temperature of 140 ℃, leaching time of 2 h, the mass ratio of liquid to solid of 10. Under the optimum conditions, the leaching rate of arsenic is more than 95%, while both of the leaching rates of antimony and lead are less than 1.0%, correspondingly.

 

Key words: arsenic and antimony bearing dust; oxygen pressure leaching; arsenic removal; NaOH solution

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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