Messi Biology indicated that high purity magnesium hydroxide (>99%) produced from salt lake brine is the best raw material for industrial scale mass production of high purity and high activity magnesium oxide. The research of this project was carried out in order to provide suitable production methods, production equipment and the best production process. The main objective is to grasp the decomposition characteristics of high purity magnesium hydroxide from salt lake brine and its effect on the generated magnesium oxide activity, specific surface area and crystallization properties through laboratory research, and to lay the theoretical foundation for the development of magnesium oxide production method, production equipment and production process.
Hebei Messi Biology Co., Ltd. said that the following conclusions were reached through experiments and research:
(1) When heating magnesium hydroxide at a heating rate of 10℃/min, the decomposition of magnesium hydroxide starts at 300℃ and ends at 480℃.
(2) Heating temperature is the main factor affecting the decomposition rate of magnesium hydroxide. As the temperature increases, the time required for complete decomposition of magnesium hydroxide is shortened. When the temperature is higher than 550℃, the effect of temperature on the decomposition speed of magnesium hydroxide is not obvious. In 550 ℃ heat preservation 10min, can make magnesium hydroxide complete decomposition. Under the condition that the heating temperature is certain, the decomposition rate of magnesium hydroxide increases with the extension of holding time.
(3) heating temperature and holding time has a large effect on the activity of magnesium oxide. The activity of magnesium oxide obtained when heated at 550℃ for 10min is the highest, and its iodine absorption value can reach 83.59mg/g. The activity of magnesium oxide decreases significantly when the holding time is increased at a certain temperature.
(4)The activity of magnesium oxide has a good correspondence with the size of its specific surface area, the larger the specific surface area, the higher the activity of magnesium oxide. With the increase of heating temperature and the extension of holding time, the specific surface area of magnesium oxide decreases, the crystallization performance improves, and the activity of magnesium oxide decreases.
(5) During the heating process, the grain size of MgO increases with the extension of holding time, and the lattice distortion decreases with the extension of holding time, but the effect of heating temperature on the grain size and lattice distortion is not obvious.
(6)The raw material of magnesium hydroxide is…
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