Study on the Method of Lime Cream to Remove Sodium from Fly Ash Red Mud by Soda-Lime Sintering Process

It is the first time to remove sodium from the fly ash red mud by soda-lime sintering process to determine whether the fly ash red mud can be used in cement production. This paper studies the effects of the reaction time, the reaction temperature, the ratio of liquid to solid, and the amount of sodium removal agent on the removal of milk of lime method of fly ash red mud in sodium. The optimal reaction conditions are that: the reaction time is 120min, the reaction temperature is 90°C, the ratio of liquid to solid ratio is 6:1, and the ratio of sodium removal agent Ca (OH) 2 to the red mud of Na2O use ratio is 9:1. Under this condition, the sodium removal rate (Na2O, the same below) to 57.2%, the total sodium content in fly ash red mud decreases from 4.7% to 1.8% after sodium removal, achieving the expected goal.