| The key step of the process of carbonation of calcined dolomite slurry for preparing light magnesium oxide is studied, which includes the optimum condition of the process and choosing additives.Based on the simulation the component of the industrial gas, the factors affecting the recovery rate of magnesium oxide in the process of carbonation of calcined dolomite slurry are examined. With orthogonal experiments, the optimum condition of carbonation was obtained under the conditions: volume percentage of CO2 in the mixed gases :30%,ratio of liquid and solid(L/S):40:l,granularity of particle in slurry:100 mosh, value of PH in reacting system:6.5,initial temperature of reacting system: 10 癈,concentration of additive:O.IM.The average recovery rate of magnesium oxide is 81.00% under such conditions. According to their significance to magnesium oxide recovery rate, the descending sequence of the above factors is ratio of liquid and solid (L/S), granularity of particle in the slurry, value of pH in the reacting system, concentration of additive.Meanwhile, in the process of choosing additives, we find an effective additive-----Diethylene Triamine(DETA).The research conclusion shows that it can raise therecovery rate of magnesium oxide, or shorten the reacting time. The effect of BETA on the optimum conditions is also made.Lastly, by the means of XREK IR, the effects of DETA on the purity of thedirect-product-------light magnesium oxide and the surface property of theby-product-------Calcium Carbonate(containing magnesium) are investigated.
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