황산바륨의 합성조건과 유동학적 특성

Synthetic Conditions and Rheological Characteristics of Barium Sulfate

Optimal synthetic condition of barium sulfate were investigated from the viewpoint of yield and bulkiness according to a randomized complete block design proposed by G.E.P. Box and K.B. Wilson. Barium chloride and magnesium sulfate were utilized as reactants in order to prepare barium sulfate in this study. It was found that optimum temperature range of reactant solutions was 60~100oC and the optimum concentration range of the reactant solutions was 10~17.3% and 10~20% respectively, on the viewpoint of yield and bulkiness. The optimum mole ratio of BaCl2 to MgSO4 was in the range of 1.50~2.0 and the optimum mole ratio of BaCl2 to MgSO4 was in the range of 1.50~2.0 and the optimum reacting time range was 15~20 minutes. The optimum drying temperature range was 110~130oC from the viewpoint of yield, but it was 90~110oC on the basis of bulkiness. Apparent viscosity of barium sulfate suspensions dispersed in various concentrations of Na. CMC was measured by using Brookfield synchrolectric viscometer model LVT, the relative equation, log etasp = A + B.phi was examined and the equation was found to agree fairly well. 1 w/v% Na. CMC aqueous solution and 0.1 volume fraction of BaSO4 powder were optimum in the preparation of BaSO4 suspension showing highest viscosity at infinite shearing.