Preparation method of high activity calcium oxide
A calcium oxide, high-activity technology, applied in the direction of calcium/strontium/barium oxide/hydroxide, etc., can solve the problems affecting the purity of calcium oxide, and achieve the goal of ensuring gradual growth, realizing effective utilization, and reducing production costs Effect
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Embodiment 1
[0021] A preparation method of highly active calcium oxide, which specifically comprises the steps of:
[0022] (1) Crush the phosphogypsum slag through a 300-mesh sieve, then raise the temperature to 250°C at a heating rate of 15°C / min to preheat the phosphogypsum slag for 20 minutes, and then raise the temperature to 500°C at a heating rate of 15°C / min. Phosphogypsum slag was calcined for 50 minutes, and then cooled to room temperature at a cooling rate of 10°C / min to obtain solid I;
[0023] (2) First wash the solid I obtained in step (1) twice with deionized water, filter and remove the filtrate, and then mix it with ammonia water with a mass fraction of 25% in a mass ratio of 1:6 to obtain a mixed solution, and then Add dihydroxyglycine to the mixed solution, the ratio of the volume of the added bishydroxyethylglycine to the volume of the mixed solution is 2:10, and then continue to feed carbon dioxide gas into the mixed solution, which can be achieved by adding 25% ammon...
Embodiment 2
[0026] A preparation method of highly active calcium oxide, which specifically comprises the steps of:
[0027] (1) Crush the phosphogypsum slag through a 200-mesh sieve, then raise the temperature to 200°C at a heating rate of 15°C / min to preheat the phosphogypsum slag for 30 minutes, and then raise the temperature to 450°C at a heating rate of 15°C / min. Phosphogypsum slag was calcined for 60 minutes, and then cooled to room temperature at a cooling rate of 10°C / min to obtain solid I;
[0028] (2) First wash the solid I obtained in step (1) with deionized water for 3 times, filter and remove the filtrate, and then mix it with ammonia water with a mass fraction of 35% in a mass ratio of 1:8 to obtain a mixed solution, and then Add dihydroxyglycine to the mixed solution, the ratio of the volume of the added bishydroxyethylglycine to the volume of the mixed solution is 3:10, and then continue to feed carbon dioxide gas into the mixed solution, which can be achieved by adding 35%...
Embodiment 3
[0031] A preparation method of highly active calcium oxide, which specifically comprises the steps of:
[0032] (1) Crush the phosphogypsum slag through a 250-mesh sieve, then raise the temperature to 280°C at a heating rate of 15°C / min to preheat the phosphogypsum slag for 15 minutes, and then raise the temperature to 400°C at a heating rate of 15°C / min. Phosphogypsum slag was calcined for 40 minutes, and then cooled to room temperature at a cooling rate of 10°C / min to obtain solid I;
[0033] (2) First wash the solid I obtained in step (1) twice with deionized water, filter and remove the filtrate, and then mix it with ammonia water with a mass fraction of 30% in a mass ratio of 1:3 to obtain a mixed solution, and then Add dihydroxyglycine to the mixed solution, the ratio of the volume of the added bishydroxyethylglycine to the volume of the mixed solution is 1:10, and then continue to feed carbon dioxide gas into the mixed solution, which can be achieved by adding 30% ammon...
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