Hebei Messi Biology Co., Ltd. stated that hydromagnesite (4MgCO3·Mg(OH)2·4H2O) is a natural basic carbonate mineral with abundant reserves. It has a pure texture, white color, and low impurity content. It is a high-quality mineral raw material for preparing magnesium products such as flame retardants, activated magnesium oxide, heavy basic magnesium carbonate, and nano magnesium hydroxide. However, due to factors such as geography, transportation, and technology, its development and utilization are limited, and there are few related studies in China. Therefore, how to develop and utilize hydromagnesite to prepare a series of high-quality magnesium compounds is the current main research and development work.
Hebei Messi Biology Co., Ltd. is committed to developing green, environmentally friendly, low-cost, and suitable methods for industrial production of high-quality magnesium oxide, magnesium carbonate, and magnesium hydroxide using hydromagnesite as raw materials and exploring its application in various fields.
Using hydromagnesite as raw material, highly dispersed hexagonal flame-retardant nano magnesium hydroxide was prepared through a simple synthetic route of “calcination-hydration-calcination-hydrothermal”. After determining the preliminary process, the effects of magnesium oxide dosage, hydrothermal temperature and hydrothermal time on the crystallinity and morphology of magnesium hydroxide were investigated, and the optimal hydrothermal conditions were determined: magnesium oxide dosage was 10%-25% (mass fraction), hydrothermal temperature was 150°C, and hydrothermal time was 3h. During the hydrothermal process, polyvinyl pyrrolidone (PVP), hexadecyltrimethylammonium bromide (CTAB), polyethylene glycol 6000 (PEG6000) and polyethylene glycol 200 (PEG200) were added to the reaction system respectively, and the effects of different modifiers and modifier dosages on the crystallinity and dispersibility of magnesium hydroxide particles were investigated. The results show that under the condition of 4% (mass fraction) PVP, the dispersibility of nano-magnesium hydroxide can be well improved, and hexagonal nano-magnesium hydroxide with good dispersibility, complete crystal shape, uniform particle size, diameter of 300-400nm, and thickness of 40-60nm is obtained.