소다 공정에서 탄산칼슘 결정의 평균입경과 형상 변화를 온도변화와 PAA 용액의 첨가에 대하여 연구하였다. 낮은온도(30 ℃, 60 ℃)에서는 Calcite 결정을, 높은 온도(80 ℃)에서는 Aragonite 결정을 얻었다. 30 ℃와 80 ℃에서 용액에 PAA 용액을 첨가하여도 결정의 형상변화는 없었다. 중간온도(60 ℃)에서 PAA 용액을 첨가하여 Aragonite 결정을 얻었다. 결정의 형상변화가 PAA 분자 첨가로 인하여 일어났다. PAA 용액의 농도가 높을수록, 더 많은 Aragonite 결정을 얻었다. PAA 수용액의 농도가 높고 분자량이 클수록 탄산칼슘 결정의 평균입경은 증대하였으며, 형상변화가 일어나는 영역에서는 PAA의 분자량이 평균입경변화에 중요한 변수가 된다.

Crystal mean size and shape change of calcium carbonate crystal was investigated by the temperature change and addition of PAA solution in the soda process. At low temperature(30 ℃, 60 ℃), calcite particles were made by. But at high temperature(80 ℃), aragonite particles were made by. At 30 ℃ and 80 ℃, Crystal shape were not changed by adding PAA solution. At moderate temperature(60 ℃), aragonite was obtained by adding PAA aqueous solution. Crystal shape was changed by adding PAA molecules. The higher concentration of PAA solution is, the more aragonite particles were observed. Incase of calcite and aragonite, mean size of calcium carbonate crystals were increased by higher molecule weight and higher concentration of PAA solution. But in the shape change region, the molecule weight of PAA was the main parameter of increasing mean crystal size.

Calcium Carbonate Calcite Aragonite PAA

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