含Cr^(3+)废水的萃取与分离研究

The Extraction and Separation of Chromium(Ⅲ) Wastewater

利用磷酸二(2-乙基己基)酯作萃取剂,煤油为稀释剂,利用萃取分离技术萃取分离含Cr3+废水中的Cr3+,从而得到了萃取分离Ct3+的最佳条件:以体积分数为5%的磷酸二(2-乙基己基)酯-煤油作萃取剂,调节Cr3+溶液的pH值为4~4.5进行萃取,萃取完成后,用浓度为5 mol/L的HCl从有机磷中反萃Cr3+,通过这些条件的确定,可以为溶剂萃取回收含Cr3+废水中的Cr3+工业化途径提供实验理论和实践依据。

Choosing bis（2-ethyl hexyl）phosphoric aid as a solvent, kerosene as diluent, extraction technology was used to extract Chromium （Ⅲ） from Cr （Ⅲ） solution. The best conditions for the chromium （Ⅲ） extraction was as follows： volume concentration of 5% of the bis （2-ethyl hexyl）phosphoric acid-kerosene as a solvent, regulate the pH of chromium （Ⅲ） solution to about 4.5 before extraction, then chromium （Ⅲ） was reversely extracted with 5 mol/L HCI from organic Phosphorus. The identification of the conditions provides experimental theoretical and practical basis to solvent extraction recovery of Cr（Ⅲ） from Chromium （Ⅲ） wastewater.