Williams, Peter, and Thomas Cloete. “The Production and Use of Citric Acid for the Removal of Potassium from the Iron Ore Concentrate of the Sishen Iron Ore Mine, South Africa”. South African Journal of Science 106, no. 3/4 (April 23, 2010): 5 pages. Accessed November 22, 2024. https://sajs.co.za/article/view/10170.