Messi Biology said that the use of high -purity magnesium hydroxide produced by salt lake brine is a raw material for industrial scale to produce high -purity and high -active magnesium magnesium oxide. In order to provide appropriate production methods, production equipment and production processes, this project is conducted. The main purpose is through laboratory research, mastering the decomposition characteristics of high -purity magnesium hydroxide hydroxide hydroxide and the effects of generating magnesium oxide activity, surface area and crystalline performance, laying the theory of production methods, production equipment and production technology for magnesium oxide oxide Base.
Messi Biology stated that the following conclusions were obtained through experiments and research:
(1) When heating at a heating speed of 10 ° C/min, magnesium hydroxide, magnesium hydroxide starts to decompose at 300 ° C, and the decomposition is over at 480 ° C.
(2) The heating temperature is the main factor affecting the speed of the decomposition of magnesium hydroxide. As the temperature rises, the time required for the complete decomposition of magnesium hydroxide is shortened. When the temperature is higher than 550 ° C, the effect of temperature on magnesium hydroxide decomposition speed is not obvious. In keeping up at 550 ° C for 10 minutes, magnesium hydroxide can be completely decomposed. Under certain conditions of heating temperature, as the thermal insulation time is extended, the decomposition rate of magnesium hydroxide has increased.
(3) Heating temperature and thermal insulation time have a great impact on the activity of magnesium oxide. When heating at 550 ° C for 10 minutes, the high activity of magnesium oxide obtained is high, and its iodine suction value can reach 83.59mg/g. Increasing thermal insulation time at a certain temperature, the activity of magnesium oxide is significantly reduced.
(4) The activity of magnesium oxide has a good correspondence than the size of the surface area. The larger than the surface area, the higher the activity of magnesium oxide. With the rise of heating temperature and the extension of the heat preservation time, the comparison of magnesium oxide decreases, the crystallization performance is improved, and the activity of magnesium oxide is reduced.
(5) During the heating process, the grain size of the MgO increases with the extension of the thermal insulation time. The lattice distortion is reduced with the extension of the thermal insulation time.
(6) The raw materials of magnesium hydroxide are granular, and the size of the particles is tens of um; the generated magnesium oxide particles are sliced, the particle size is small, and it is generally less than 1um. As the heating temperature rises, the phenomenon of adhesion between the magnesium oxide particles is generated.
(7) Magnesium oxide produced by magnesium hydroxide is easy to hydrate. Under the condition that the humidity is 75 % and the temperature is 60 ° C, the magnesium oxide can be all hydrated by about 6h. In addition, the generated magnesium hydroxide is also prone to carbonate reactions in the air to generate magnesium carbonate.
(8) CL and S elements in magnesium hydroxide raw materials cannot be removed during the heating and decomposition of magnesium hydroxide.