China Opens 500-Tonne Rubidium and Caesium Line as It Tightens Exit Rules for Sensitive Staff

A demonstration plant in Jiangxi province has begun extracting rubidium and caesium from lithium-processing waste. The South China Morning Post reported that it is the first continuous tower extraction and separation line of its kind, with annual capacity of 500 tonnes for low-grade feedstock. Both metals are used in atomic clocks, specialty glass, drilling fluids and vacuum equipment, and both have historically been produced in small quantities from a narrow set of deposits.

Recovering them from waste changes the supply calculation. Lithium refining already runs at scale in China, so the feedstock exists as a byproduct with no current use. A country that turns tailings into a supply of critical metals gains volume without opening a new mine and without creating a new import dependency.

At the same time, Beijing has tightened the rules governing who may leave the country. Kommersant reported that new State Council regulations took effect allowing authorities to restrict departures where national or technological security is at risk. Read alongside the export controls Western governments have placed on advanced chips, the direction is symmetrical: Washington restricts what technology can enter China, and Beijing restricts what knowledge can leave it.

The two moves belong to the same program: domestic substitution for inputs China does not control, and legal barriers around the people who hold the resulting expertise.