Hebei Messi Biology Co., Ltd. stated that it uses light-burned magnesium oxide as raw material and uses the hydration method to prepare dry magnesium hydroxide powder for fire extinguishing agents. The product purity was determined by titration analysis, and the effects of stirring rate, water bath temperature and reaction time on the magnesium hydroxide conversion rate were investigated. As the stirring rate increases, the reaction temperature increases, and the reaction time increases, the conversion rate increases significantly. Under the conditions of stirring rate 900r/min, temperature 90℃ and reaction time 8h, the conversion rate can reach 81%. The crystal form of the product is good, the morphology is an obvious flake structure, and the particle size and purity of the product meet the requirements of the national standard for dry powder fire extinguishing agents.
Traditional dry powder fire extinguishing agents usually use inorganic salts as base materials, such as sodium bicarbonate, ammonium phosphate, and amino dry powder. Due to the poor fire extinguishing ability of sodium bicarbonate dry powder fire extinguishing agent, it is not suitable for Class A fires; while ammonium phosphate and amino dry powder fire extinguishing agents have a wide range of applications, but their prices are relatively high. Magnesium hydroxide has no advantages as a fire extinguishing agent. It has a series of advantages such as poisonous, smokeless, drip-resistant, anti-acid, good filling flame retardant effect, stable chemical properties of the decomposition product (magnesium oxide), and no secondary hazards. It has become an important inorganic flame retardant for reducing and suppressing smoke. . The decomposition and dehydration temperature of magnesium hydroxide is 340~490℃, which is higher than the decomposition and dehydration temperature of aluminum hydroxide (200~350℃), and has better thermal stability; magnesium hydroxide has higher decomposition energy and The heat capacity helps to improve the fire extinguishing efficiency; magnesium hydroxide also has the advantages of easy availability of raw materials and low cost. Compared with traditional dry powder base materials, magnesium hydroxide is used as a base material in dry powder fire extinguishing agents and has broad application prospects and market potential.
Hebei Messi Biology Co., Ltd. stated that it used Liaoning Dashiqiao light-burned magnesium oxide powder as raw material, took advantage of the high activity of light-burned magnesium oxide, and prepared magnesium hydroxide through direct hydration. The effects of stirring rate, reaction temperature, and reaction time were investigated. The influence of magnesium hydroxide conversion rate and particle size distribution was discussed. The feasibility of preparing dry magnesium hydroxide powder for fire extinguishing agent through hydration method of lightly burned magnesium oxide was discussed.