Study on the carbonization condition for the preparation of nano-CaCO3 from phosphogypsum
The carbonization condition for the preparation of nano-CaCO3 from phosphogypsum was stud-ied.Using the as-obtained CaY from phosphogypsum as calcium source,and CO2 as carbonizing precipi-tant,taking the size and uniformity of CaCO3 particles as the main index.The result showed that 2.5%ZX+1%ZY was determined as the more appropriate complex crystal control agent,and the carbonization condition was optimized as:the addition of the complex crystal control agent 3.5%,reaction temperature 15℃and the CO2 flow rate 400 mL/min.The as-prepared sample is calcite CaCO3 with uniform particle size of about 33 nm in diameter and good dispersivity,under the optimized condition.The possible control-ling mechanism of the agent was preliminarily discussed.
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