Hebei Meixi Bio *** recommends a called"Environmentally friendly"Green and safe wastewater treatment agent - magnesium hydroxide. Due to its buffering, high activity, strong adsorption capacity, non-corrosive, safe, non-toxic and harmless, it has been widely used in industrial wastewater treatment systems in recent years. It mainly includes: neutralization and treatment agent of acidic wastewater, removal of heavy metal ions, removal of nitrogen, phosphorus and other harmful substances in wastewater. According to the application status of magnesium hydroxide at home and abroad, the development prospect of magnesium hydroxide in China is prospected.
Magnesium hydroxide, molecular formula mg(OH)2, relative molecular weight 5832。It is a white powder, and the magnesium hydroxide obtained by crushing natural brucite is often gray due to the presence of impurities. The aqueous solution of magnesium hydroxide is alkaline, soluble in dilute acid and ammonium salt solution, and almost insoluble in water and alcohol. The solubility in water (18) is 00009g 100ml, but easy to absorb carbon dioxide in the air. When heated to more than 200 degrees in alkaline solution, it becomes hexagonal crystal. In 350 it decomposes into magnesium oxide and water.
Hebei Meixi Biotechnology said that magnesium hydroxide for environmental protection is different from general magnesium hydroxide in terms of physical state, activity, particle size and other indicators. For example, magnesium hydroxide used in foreign wastewater is generally semi-solid, that is, a paste containing 50% water, and the reactivity requirements are relatively high, that is, the original particle size is relatively small.
Magnesium hydroxide has strong adsorption, high activity, non-precipitation and non-coagulability, good fluidity, easy use and adjustment, pH value 9 and other advantages, and has a wide range of applications in the environmental field: neutralizing industrial acid-containing wastewater; removal of heavy metals from industrial emissions and mine emissions; exhaust smoke desulfurization; soil acid rain treatment and pH value adjustment, etc. Compared with calcium oxide, calcium hydroxide, magnesium oxide, sodium hydroxide, sodium carbonate and many other alkalis, it not only has many advantages in technology, but also has low cost, convenient operation and safe use.