Study on the whole-grain magnetic-float combination beneficiation process of high mud lithium mica

The area around South China contains a large number of high mud lithium mica resources with complex mineral composition and high content of fine mud, resulting in separation difficulties and low resource utilization. Geochemistry confirms that the evolution of lithium mica shows a general trend of biotite → ferrimuscovite → zinnwaldite → Trilithionite → lithium mica or a similar trend. This one of the iron-bearing lithium mica has a certain degree of weak magnetism, so superconducting magnetic separation technology has a certain potential. In this paper, for the high mud lithium mica resources in Jiepai Ling, Hunan Province, a new process of magnetic-flotation joint sorting was carried out for the whole grain size. Zinnwaldite is preferentially separated and enriched by high gradient magnetic separation, difficult lithium mica is pre-enriched by flotation, and flotation concentrate and fine mud are separated and enriched by superconducting technology. Finally formed a "high gradient magnetic separation - fluorite flotation - lithium mica flotation - superconducting magnetic separation" of the whole particle size beneficiation process. The high mud lithium mica ore was obtained at a grade of 0.76% Li2O in the raw ore, and the synthesized lithium mica concentrate with a Li2O grade of 2.22% and a Li2O recovery of 77.62% was obtained. Through the organic combination of high gradient magnetic separation, superconducting magnetic separation and flotation technology, the new process realizes the efficient extraction of high mud lithium mica in full grain size, which provides a reference for the efficient development and utilization of complex lithium mica ores.