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響應曲面法優化Na2S-NaOH體系浸出硫酸燒渣中的砷

Arsenic removal from pyrite cinders in Na2S-NaOH solution with parameters optimized using the response surface methodology

  • 摘要: 硫酸燒渣作為重要的二次資源,除砷有利于提高燒渣的價值.針對某含砷硫酸燒渣預處理脫砷的問題,采用Na2S-NaOH體系浸出燒渣中的砷.首先采用單因素試驗確定Na2S和NaOH的藥劑用量范圍,進而采用響應曲面法優化浸出工藝參數.結果顯示,響應曲面法優化Na2S-NaOH體系中浸出砷的模型顯著,Na2S、NaOH和溫度均對砷的浸出有著重要影響,且溫度越高越有利于砷的浸出,Na2S和NaOH之間存在明顯的交互作用,在80℃、NaOH濃度為0.34 mol·L-1、Na2S濃度為0.12mol·L-1時,浸出后燒渣中的砷質量分數可以降低到0.08%.

     

    Abstract: Pyrite cinder is one of the important secondary resources; however, the arsenic typically contained in pyrite cinder is harmful to metallurgical process. The removal of arsenic can improve the value of pyrite cinders. Thus, a pretreatment method for removal of arsenic from pyrite cinders using a Na2S-NaOH solution was investigated in this paper. A single factor experiment was conducted to determine the appropriate concentration ranges of NaOH and Na2S, and then the response surface methodology (RSM) was used to optimize the leaching parameters. The results indicate that the optimized RSM model is reliable. The temperature, NaOH concentration, and Na2S concentration have significant effects on the arsenic removal. The higher temperature is found to be favorable to the leaching of arsenic, and a significant interaction is found between the concentrations of NaOH and Na2S. The content of arsenic in the leaching slag can be reduced to 0.08% at 80℃ when the concentration of NaOH and Na2S is 0.34 and 0.12 mol·L-1, respectively.

     

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