The invention provides an extraction agent and a method for purifying alkaline gold-containing
wastewater by using the extraction agent, and belongs to the field of
wastewater purification, the extraction agent adopts a rigid
bisphenol fluorene ring to replace a traditional aliphatic long-chain skeleton, the unique V-shaped
spatial configuration of the extraction agent forms a molecular pre-organization cavity through
phenol bond bridging, and the linear / plane
geometric configuration of a gold-
cyanogen complex is accurately matched, so that the extraction agent has a good extraction effect on the gold-
cyanogen complex. The coordination binding capacity is obviously enhanced. Through the synergistic effect of a molecular structure, a pi
electron system of a
bisphenol fluorene skeleton and a
thioamide group, an Au-CN bond is weakened through pi-d
electron coupling, and meanwhile,
sulfur-
oxygen double active sites are constructed to capture Au < + > / Au < 3 + > in a grading manner, so that directional dissociation and valence state self-adaptive
chelation of the complex are realized. According to the method, a gradient interfacial tension layer is formed through interface regulation and control optimization and
phenol bond connected hydrophobic chain segments, the
phase separation process is greatly accelerated, the gold
recovery rate is larger than 95%, the cooperation problem of high-selectivity extraction and deep purification is solved, and the purpose of purifying the alkaline cyanided gold-containing
wastewater is achieved.