Process for preparing hydrotalcite

A method of preparing hydrotalcite, comprising:

• 1) mixing a magnesium source, an aluminum source, a carbonate ion source, and an alkali source, thus preparing a mixture, and then stirring the mixture at 30˜80° C. for 3˜4 hours, thus forming a seed;
• 2) adding an alkali source to the seed, increasing a temperature to 90˜150° C., and then performing a reaction for 1˜12 hours while maintaining the temperature of 90˜150° C., thus obtaining primarily crystallized hydrotalcite particles;
• 3) adding a magnesium source, an aluminum source and a carbonate ion source to the primarily crystallized hydrotalcite particles, and then performing a reaction at 90˜150° C. for 1˜18 hours, thus obtaining secondarily crystallized hydrotalcite particles;
• and
• 4) washing the secondarily crystallized hydrotalcite particles with distilled water and then performing drying.