Introduction to Sodium Hydroxide
Sodium hydroxide, the chemical formula is NaOH, commonly known as caustic soda, caustic soda, and caustic soda, is a strong corrosive alkali, generally in the form of flakes or particles, easily soluble in water (it releases heat when dissolved in water) and forms Alkaline solution is also deliquescent, and it is easy to absorb water vapor (deliquescence) and carbon dioxide (deterioration) in the air. You can add hydrochloric acid to check whether it has deteriorated.
NaOH is a chemical in the chemical laboratory, and it is also one of the common chemicals. The pure product is a colorless transparent crystal. Density 2.130g/cm3. The melting point is 318.4°C. The boiling point is 1390°C. Industrial products contain a small amount of sodium chloride and sodium carbonate, and are white opaque crystals. There are lumps, flakes, granules and rods, etc. Formula weight 39.997.
Sodium hydroxide can be used as an alkaline cleaning agent in water treatment, soluble in ethanol and glycerin; insoluble in propanol. Disproportionation reaction with chlorine, bromine, iodine and other halogens. Neutralizes with acids to form salt and water.
Product physical and chemical properties:
The main body is white and shiny. This product is easy to absorb moisture and dissolve in water. It is strongly alkaline and highly corrosive. It reacts violently with acids and ammonium salts to release hydrogen gas. It can absorb sodium chloride and sodium sulfate and react with various organic and inorganic substances.
Product Usage:
Widely used in papermaking, rayon, textile printing and dyeing, soap making, medicine, dyestuff, chemical industry, metallurgy, refining petroleum and other industries
It is also the main raw material for pesticides, tanning, organic synthesis, and electroplating industries.
Sodium hydroxide for metallurgy is used to treat bauxite, which contains alumina, which is the raw material for aluminum production. Alumina can be purified from concentrate with sodium hydroxide.
Reaction equation: Al2O3+2NaOH+H2O=2Na[Al(OH)4] or Al2O3+2NaOH=2NaAlO2+H2O[12]
Sodium hydroxide is also used to extract tungstate, the raw material for tungsten refining, from wolframite:
4FeWO4+8NaOH+2H2O+O2=4Na2WO4+4Fe(OH)3
Sodium hydroxide is also used in the production of zinc alloys and zinc ingots.
Sodium Hydroxide for Water Treatment
In sewage treatment plants, sodium hydroxide can reduce the hardness of water through neutralization reaction. In the industrial field, it is a regeneration agent for the regeneration of ion exchange resins. Sodium hydroxide is strongly alkaline and relatively soluble in water. Because sodium hydroxide has a relatively high solubility in water, it is easy to measure the dosage and can be conveniently used in various fields of water treatment.
Sodium hydroxide is used in the following topics in water treatment: eliminating water hardness; adjusting the pH value of water; neutralizing wastewater; eliminating heavy metal ions in water by precipitation; regeneration of ion exchange resins.
