Removal of calcium from phosphoric acid produced by the nitric acid process using solvent extraction with TCHDGA and stripping with water - Chengjin Xu; Miaomiao Zhang; Jianhui Su; Xiujing Peng; Xiangfeng Kong; Yanping Luo; Jiahui Sun; Yu Cui; Xuchuan Jiang; Guoxin Sun (Hydrometallurgy, 2024)