闪锌矿氧化浸出与协同萃取分离耦合研究

提出了闪锌矿在H2SO4 HNO3 O2 中的氧化浸出与以四氯乙烯和磷酸二(2 乙基己基)酯组成的协同萃取3剂和表面活性剂的分离耦合操作模式。实验在自制的50mL不锈钢反应釜中进行。优化的工艺条件为: 1. 8mol/LH2SO4 +0. 2mol/LHNO3 +0. 1MPaO2 +6mLC2Cl4 +4mLP204,表面活性剂用量为约1. 2g/L。用冰水冷却有机相获得高质量的硫,然后反萃有机相得到纳米Fe2O3 粉末。混合有机相可以循环使用。结果表明:与普通浸出相比,耦合浸出的锌浸出率提高了近26%,并能够在同一装置中实现锌、硫和铁的分离。

Study on coupling of oxidation leaching and separation of coordinated extraction for sphalerite

A coupling model of leaching and separation of coordinated extraction for sphalerite with complex solvents composed of tetrachloroethylene (C_2Cl_4), 2-ethylhexyl phosphate (P204) and surfactant in oxidation reagents of H_2SO_4-HNO_3-O_2 was put forward. The experiment was carried out in a stainless-steel autoclave of 50 mL capacity. The optimization techniques conditions can be expressed as:1.8 mol/L H_2SO_4+0.2 mol/L HNO_3+0.1 MPa O_2+6 mL C_2Cl_4+4 mL P204,and the amount of surfactant is 1.2 g/L. Cooling the organic phase with ice can (recover) the high-grade sulfur and stripping the phase can obtain the Fe_2O_3 nano-powders. The mixed phase can be used (repeatedly) in this model. The results show that the rate of leaching zinc of coupling process is about 26% higher than that of common process, and the separation of zinc, sulfur and iron can be completed in the same (equipment.)