Preparation of superfine and sheet magnesium hydroxide from calcined magnesite

The superfine and sheet magnesium hydroxide was preparaed by direct precipitation method,using the calcined magnesite as magnesium source and ammonia as agent precipitation.The influence of magnesium hydroxide's average particle size with the relationship of different reaction conditions by particle size tester was studied.And then the best process conditions of the synthesis of magnesium hydroxide was got.The product was verified for magnesium hydroxide by X-ray diffraction,scanning electron microscope,thermo-gravimetric analysis and infrared spectromete.At last,the best synthesis condition was got.The influence of surfactant to magnesium hydroxide was researched.The results show that the experiment product is superfine and sheet magnesium hydroxide;the best synthetic process conditions are of 40 ℃ reaction temperature,reaction time of h 1.5,ammonia water dosage of 170 mL and adding speed of 12 mL/min;the anionic surfactant-SDBS can effectively improve the dispersion and morphology of magnesium hydroxide.