PRILIMIN.LABOR.TEST FOR PREPARA.OF PRECIPITED BARIUM CARBONATE&SULFUR...ETC

Abstract

The present study deals with the possiblity of Preparation of Precipitated Barium Carbonate and Sulphate from Barite ore from LEVAN area (Dohok governarate – Kurdistan region). The study included finiding a proper technical route for the preparation of purified Barium Carbonate and Barium Sulphate , where the purity of the Laboratory prepared samples exceeds 99% . The optimum conditions for the preparation of the precipitated Barium Carbonate and Sulphate from Barite ore ( milled to a particle size less than 75 micron) which contained about 70% BaSO4 are as follows:- A-stage 1 (Acid washing of Barite ore) -Concentration of washing acid (HCl): 25% (wt %) -Ratio of washing acid to ore: 2/1(acid vol . /ore wt.) -Reaction temperature: 102 C 0 (Boiling) . - Reaction time: 1.5 hr B-Stage 2 (Preparation of unpurified Barium Carbonate) -Concentration of Sodium Carbonate solution : 45% wt. -Quantity of Sodium Carbonate used in reaction : 200% excess the stochiometric quantity . -Reaction temperature : 105 0C ( Boiling ) . - Reaction time : 6 hrs C-Stage 3 ( preparation of Barium Chloride solution ). -Concentration of Hydrochloric acid used in reaction : 2% wt. - Quantity of used acid : Stochiometric quantity. -Reaction temperature : Room temperature ( 30 0C) -Reaction time : 30min D.stage 4 I-Preparation of Barium Carbonate from Barium Chloride solution . -Concentration of Sodium Carbonate solution : 20% wt. -Final PH value of reaction mixture = 8 -Reaction temperature : ≈ 30 0C ( Room temperature) .