Nm-class calcium carbonate carbonization process
A technology of nano-calcium carbonate and process method, which is applied in the field of nano-powder preparation, can solve the problems of large investment in equipment, no discovery of nano-calcium carbonate, poor control of inclusion particles, etc., and achieve the effect of shortening the reaction time
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[0042] Example 1:
[0043] The lime was digested with hot water at 85°C, aged for 8 hours, and the ratio of grey to water was 1:4. The concentration of carbon dioxide in the mixed gas is 30%; the density of calcium hydroxide suspension is 1.055g / cm 3 , the concentration is 9.6%, and the sedimentation volume is 3.35ml / g. The additive citric acid is chemically pure, and the weight percentage of citric acid added before carbonization is 0.42%. Using a new carbonization process with circulation and strong shear mixing, the reaction time of the entire carbonization process lasted 31 minutes, the initial temperature was 18 °C, and the reaction end point was 33.5 °C; when the pH value of the suspension dropped to 7, the reaction was stopped, and the slurry settled. The volume is 5.84ml / g, filtered and dried. The particle size of the nano-calcium carbonate product is between 60-85nm, the crystal morphology is a regular cubic structure, and the specific surface area of the nano-cal...
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[0044] Example 2:
[0045] The lime was digested with hot water at 85°C, aged for 15 hours, and the ratio of grey to water was 1:4. The carbon dioxide concentration in the mixed gas is 30%; the density of the calcium hydroxide suspension is 1.055g / cm3, the concentration is 9.6%, and the sedimentation volume is 3.35ml / g. The additive citric acid is chemically pure, and the weight percentage of citric acid added before carbonization is 1.68%. Adopting a new carbonization process with circulation and strong shear mixing, the reaction time of the entire carbonization process lasted 32 minutes, the initial temperature was 18 °C, and the reaction end temperature was 34 °C; when the pH value of the suspension dropped to 7, the reaction was stopped, and the slurry The sedimentation volume is 3.54ml / g, filtered and dried, the particle size of the nano calcium carbonate product is between (50-60)×330nm, the crystal morphology is a chain structure, and the specific surface area of the...
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