SQM is one of the biggest lithium producers in the world. In Chile, the production takes place on 2 different sites in the Salar del Carmen, and the Salar de Atacama.
Lithium is a by-product of potassium. No chemical product is used in the precipitation process.
Nevertheless, SQM remains a highly criticized company for matters of corruption or relation with the Chinese, regularly faces legal procedures. Sources: Financial Times, Chile Today, Usine Nouvelle, Reuters.