Comprehensive Processing Technology of Slags of Phosphorus Industry to Produce Precipitated Silica and Rare-Earth Concentrate

Abstract

The report presents a technological scheme of complex processing of man-made waste of phosphorus production - slag to produce highly dispersed silicon dioxide and a rare-earth metal concentrate. The technological parameters of each operation of the technology are chosen. Recovery of rare-earth metals from phosphorus slags during various operations was, %: leaching – 95.0; extraction - 90.2; stripping on the average ∼ 93.2; the production of ∑ REM oxide concentrate is 93.9. The composition of some batches of "white soot" obtained during processing of the technological scheme is shown.