黏土矿和黄铁矿诱发地浸采铀堵塞的研究进展OA

In-situ leaching(ISL)of uranium,a core technology in China's uranium mining,faces sig-nificant challenges due to pore blockage caused by clay minerals and pyrite,which severely restricts leaching efficiency and production capacity.This paper systematically reviews the causes and mecha-nisms of blocking phenomena in acid leaching,alkaline leaching,and"CO2+O2"neutral leaching processes.It reveals that clay minerals induce pore blockage through physicochemical interactions such as swelling,ion exchange,and argillization of non-clay minerals,while pyrite oxidation gener-ates sulfate and iron ions,leading to permeability reduction via mineral precipitation and colloidal ad-sorption.Current unblocking technologies primarily employ inhibitors to suppress pyrite oxidation,chelating agents to immobilize iron-containing precipitates,and swelling suppressants to mitigate clay mineral expansion.However,challenges remain,including lack of specificity,limited environmental compatibility,and insufficient long-term stability.Future research should focus on elucidating the synergistic mechanisms of clay-pyrite interactions,developing intelligent unblocking materials with targeted functionality,and establishing ecological risk assessment frameworks.These advancements aim to drive innovation in green and efficient unblocking technologies,providing theoretical and tech-nical support for China's large-scale uranium base construction and sustainable nuclear energy devel-opment.