What chemicals can calcium hydroxide be used for？

Applications of Calcium Hydroxide in the Preparation of Chemical Products

As an important inorganic base and inorganic salt, calcium hydroxide (Ca(OH)₂) relies on its alkalinity, reactivity and other properties to serve as a key raw material for the preparation of various products in the chemical industry. It can be used in the production of calcium salt chemicals, water treatment agents, construction chemical materials and other categories

Preparation of Calcium Salt Chemicals

Calcium carbonate: Calcium hydroxide reacts with carbon dioxide to form calcium carbonate, which is one of the core processes for the industrial preparation of light calcium carbonate. Light calcium carbonate is widely used as a filler in rubber and plastics, and as a filler and coating in papermaking.

Calcium chloride: Calcium hydroxide undergoes a neutralization reaction with hydrochloric acid to produce calcium chloride. Calcium chloride is used as a desiccant, snow melting agent, calcium fortifier in food processing, and also in the treatment of drilling fluids in petroleum exploitation.

Calcium nitrate: Calcium nitrate is prepared by the reaction of calcium hydroxide with nitric acid. Calcium nitrate is an important nitrogen fertilizer, and can also be used in the production of concrete antifreeze and tobacco bulking agent.

Calcium sulfite: Calcium hydroxide reacts with sulfur dioxide to form calcium sulfite, which can be used in pulp bleaching in the papermaking industry and as a raw material for regenerating desulfurizers.

Preparation of Water Treatment and Environmental Protection Chemical Agents

Flocculants: Using calcium hydroxide as a raw material, composite flocculants such as polyferric sulfate calcium and polyaluminum chloride calcium can be prepared. These agents can adsorb suspended impurities in water and are widely used in the treatment of industrial wastewater and domestic sewage.

Desulfurizer additives: Calcium hydroxide itself can be directly used as a desulfurizer for flue gas desulfurization in power plants and steel plants, and can also be combined with other raw materials to prepare modified desulfurizers to improve desulfurization efficiency.

pH regulators: Utilizing its alkalinity, calcium hydroxide can be prepared into special water pH adjustment agents, which are used to adjust the pH of industrial wastewater and aquaculture water to improve water quality.

Preparation of Construction Chemical Materials

Cement additives: Calcium hydroxide can participate in the preparation of cement accelerators, early strength agents and other additives, which can adjust the hydration reaction rate of cement and improve the early strength of cement products.

Mortar and putty powder: As one of the core raw materials, calcium hydroxide is mixed with cement, sand, etc. to prepare construction mortar, and can also be combined with ground calcium carbonate, talcum powder, etc. to produce interior wall putty powder. Its gelling property and plasticity are used to improve the construction effect.

Waterproof agents: Calcium hydroxide can react with fatty acids to prepare saponified waterproof agents, which are used for waterproof treatment of building walls and roofs to form a water-insoluble waterproof film.