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how to manufacture acid grade fluorspar 1

The estimated imports of fluorspar for 2001 were 530,000 metric tons of acid-grade, 33,000 of metallurgical-grade, and 181,000 tons from hydrofluoric acid plus cryolite. Between 1997 and 2000, 63 of fluorspar imports came from China, 26 from South Africa, and 11 from Mexico. Exports of