A preparation of highly active porous ultrafine ca(oh) from shells 2 Methods
A high-activity, CO2 technology, applied in the direction of calcium/strontium/barium oxide/hydroxide, etc., can solve the problems of poor activity, whiteness and BET performance, and it is difficult to obtain high activity, and achieve the effect of performance improvement.
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Embodiment 1
[0035] Weigh shells and KOH with a weight ratio of 50:1, add water to dissolve, the weight ratio of shells and water is 1:3, heat and cook until the phosphorus-containing membrane on the inner wall of the shell is destroyed, wash the shells, perform centrifugal dehydration, and dry ;
[0036] Then put the alkali-washed shells into the HCl solution with a mass concentration of 1%-5%, the weight ratio of the shells to the HCl solution with a mass concentration of 1%-5% is 1:1.7, and stir until the impurities on the outer wall of the shell are removed Finally, the shells are washed, centrifugally dehydrated, and then dried;
[0037] The shells after alkali washing and acid washing are coarsely crushed to 1-3mm as required, and then the coarsely crushed shells are ultrafinely crushed to 800nm by airflow mill as required, and the obtained ultrafine crushed shell powder is subjected to vertical airflow calcination method Calcination, using the airflow from bottom to top to suspen...
Embodiment 2
[0040] The difference from Example 1 is that the material temperature in the vertical airflow calcination decomposition zone in the preparation step is 30°C.
Embodiment 3
[0042] The difference from Example 1 is that the material temperature in the vertical airflow calcination decomposition zone in the preparation step is 150°C.
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