OBTAINING OF MAGNESIUM OXIDE FROM SERPENTENITES OF THE ARVATEN DEPOSIT OF UZBEKISTAN

Abstract

The article presents the results of a study of the processes of obtaining magnesium oxide by decomposing serpentinite of the Arvaten deposit with sulfuric acid and with the addition of nitric acid to a solution of sulfuric acid, followed by separation of silica from the suspension, neutralization of the filtrate with ammonia to a pH value of 8.5 for precipitation and separation of impurity metal ions, deposition and separation of magnesium ions from solution using ammonia and ammonium carbonate; thermal decomposition of magnesium korbanate to produce magnesium oxide. It has been found that using a mixture of acids i.e. with the addition of a small amount of nitric acid in a solution of sulfuric acid, the yield of magnesium oxide is increased from 83.34% to 92.68% than when using only sulfuric acid at single standards. Under optimal conditions, after thermal decomposition of magnesium carbonate, a product containing 97.13% magnesium oxide with a recovery of 92.68% from the feedstock is obtained.