Thiophene-amide-sodium phosphate-based sulfide mineral collectors, their preparation methods, and applications.

Abstract

This invention provides a sulfide mineral collector based on thiophene-amide-sodium phosphate, its preparation method, and its application, belonging to the fields of chemical synthesis and mineral processing. The sodium phosphate group at the end of the collector endows the molecule with excellent water solubility, enabling efficient dispersion and convenient addition of the agent in the slurry. Simultaneously, this hydrophilic group preferentially anchors to the mineral surface through electrostatic interactions, synergistically combining the directional adsorption of the rigid thiophene skeleton with the specific coordination of the amide group to copper and zinc ions, forming a unique multi-step synergistic mechanism of "electrostatic pre-anchoring – planar adsorption – coordination locking." This mechanism not only enhances the collecting ability for chalcopyrite and sphalerite but also reduces the non-selective adsorption of non-target minerals such as pyrite at the molecular level through electrostatic repulsion and steric hindrance effects, thereby achieving efficient and selective separation of copper and zinc minerals without relying on high-alkalinity conditions and large amounts of inhibitors.

Images