Is Magnesium hydroxide precipitation

Magnesium hydroxide is insoluble in water and is a sediment. Magnesium hydroxide is a white crystal or powder. Magnesium hydroxide is insoluble in water and alcohol, soluble in dilute acid and ammonium salt solution, and the aqueous solution is alkaline. The solubility in water is very low. Generally speaking, except for sodium hydroxide, potassium hydroxide, Barium hydroxide, ammonia water, Calcium hydroxide slightly soluble in water, other hydroxides are difficult to dissolve in water.
Application field of Magnesium hydroxide
1. Magnesium hydroxide is an excellent flame retardant for plastic and rubber products. As a flue gas desulfurization agent in terms of environmental protection, it can replace caustic soda and lime as a neutralizer for acidic wastewater. It is also used as an oil additive for corrosion prevention and desulfurization. In addition, it can also be used for refining in the electronics industry, pharmaceuticals, sugar, as insulation materials, and in the manufacturing of other magnesium salt products.
2. Magnesium hydroxide has excellent buffering performance, reactivity, adsorbability, thermal decomposition performance, etc. It can be used not only as chemical materials and intermediates, but also as a green environmental flame retardant and additive in polymer material industries such as rubber, plastics, fibers and resins. Magnesium hydroxide is mainly used as flame retardant, acid wastewater treatment agent, heavy metal removal agent, flue gas desulfurization agent, etc. in the field of environmental protection.
3. The product can be used as flame retardant or flame retardant filler and added to polyethylene, polypropylene, polystyrene and Acrylonitrile butadiene styrene, which has good flame retardant and smoke suppression effects. The amount of addition is 40~20 parts.
However, anionic surfactants are required to treat the surface of particles, such as inexpensive advanced fatty acid alkali metal salts or alkyl sulfates and sulfonated succinates, with a dosage of about 3%. This product is also used in the manufacturing of magnesium salts, refining of sugar, pharmaceutical industry, daily chemical industry, etc.
chemical property
Magnesium hydroxide is a medium strong alkali (Magnesium hydroxide has a very low solubility, its solution is very weak in alkalinity, and sometimes it is treated as a weak alkali). Heating to 623K (350 ℃) means dehydration and decomposition: Mg (OH) 2 → MgO+H2O, which is easily soluble in acid or ammonium salt solutions. Like magnesium oxide, it is easy to absorb carbon dioxide in the air, gradually forming basic carbonates composed of 5MgO · 4CO2 · xH2O. It decomposes into magnesium oxide and water above 350 ℃, but can only be completely dehydrated above 1800 ℃.
Storage precautions
Store in a cool and ventilated warehouse. The temperature of the warehouse should not exceed 37 ° C. It should be stored separately from oxidants and edible chemicals, and mixed storage should be avoided. Keep the container sealed. Keep away from sparks and heat sources. The warehouse must be equipped with lightning protection equipment. The exhaust system should be equipped with grounding devices for conducting and removing static electricity. Adopting explosion-proof lighting and ventilation settings. Prohibit the use of equipment and tools that are prone to sparks. The storage area should be equipped with emergency response equipment for leaks and suitable storage materials.