China's caesium-from-brine tech could reduce reliance on Canada, Australia

Chinese researchers have pioneered a novel, environmentally friendly technique to extract caesium from salt lake brine, a move that could reduce China's heavy dependence on foreign ores. Caesium is a critical strategic metal essential for satellite atomic clocks, missile thermal imaging sensors, and advanced specialty glass. Both China and the US are top consumers but import most of their supply from Canada's Tanco mine, Zimbabwe's Bikita mine, Namibia's Karibib project, and Australia's Sinclair deposit. While China's state-owned Sinomine Resources controls the Tanco and Bikita operations, domestic caesium reserves are largely locked in hard-to-process brine, with only low-grade ore deposits available. The new extraction method directly addresses the two major hurdles: the low concentration of caesium in brine and the high levels of interfering ions such as sodium, potassium, magnesium, calcium, and rubidium. By effectively separating caesium from these competing elements, the technology could tap into a vast domestic resource, potentially reshaping global supply chains and reducing China's reliance on Canadian and Australian ores.