Calcium carbonate whiskers were prepared by means of carbonation using active lime as raw materials. The effect of the ration of magnesium to calcium, reaction temperature, stirring speed and the ventilation of carbon dioxide on the synthesis of calcium carbonate whiskers was studied. The result shows that the reaction time has the biggest influence on the synthesis of calcium carbonate whiskers, then the ratio of magnesium to calcium and the ventilation of carbon dioxide,and finally the stirring speed. When the ration of magnesium to calcium is 2,the reaction temperature is 80℃ ,the stirring speed is 100 ~ 130r/min and the ventilation of carbon dioxide is 70 ~ l00mL/ min,the uniform aragonite calcium carbonate whiskers with the length of 25 ~30 μm,the ration of length to diameter about 28 can be obtained.%采用硫酸、聚二甲基二烯丙基氯化铵(PDMDAAC)和阳离子型聚季铵盐对膨润土进行改性,考察了改性膨润土在不同条件下对含磷污水的处理能力,并比较了原土、酸改膨润土和改性膨润土对含磷污水的处理效果.结果表明:改性膨润土用量为6g/L,pH为4～10,吸附时间为40min,温度为20℃时,污水中磷的去除率可达98%以上.该方法具有处理效果好,操作简单,运行费用低等优点.
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