Vanadium extraction from slag - using soda soln at low temp, avoiding silica impurities

摘要

Method comprises firing the slag with calcium contg. addns. in an oxidising medium grinding to -0.1mm grain size, and leaching with a soda soln. of 25-50 g/l Na2O concn. Improvement is that the soln. has a CO3--/Na2O mol. ratio of 1, the wt. ratio liquid: solids is 1-10:1 and leaching is carried out at 60-95 degrees C for 3-120 mins. The method uses lower temps. than prior art and SiO2 dissolution is reduced.