Cradle to Gate
Identity ID
3dc6f6ef-18d1-4afb-a1d4-0c9ec2df2550
Materials
Associated ID
9f931926-9e71-4996-a1f0-b365d3a15ac5
Included activities starts
Included activities ends
Description
Calcium hydroxide is widely used in fields such as building materials, water treatment, soil conditioners, the preparation of bactericides, chemical synthesis, food processing and papermaking; Calcium hydroxide is modelled as a pure substance; when modelling this substance, the user is required to add a solvent of their choice in the model. The dataset includes the main raw and auxiliary materials, energy, atmospheric emissions and solid waste of the production process, in which the waste-gas treatment process is included within the dataset boundary, while infrastructure such as the manufacture of production equipment and plant construction is not included within the dataset boundary; the data inventory is formed by merging data from multiple sources; the production activities of this product include raw material transport, slaking, screening, powder selection, grinding and other process steps.
Activity Description
The production activities of this product include raw material conveying, digestion, screening, classification, grinding, and other processes.
Process Description
Calcium hydroxide has the chemical formula Ca(OH)2 and CAS number 1305-62-0. It is generally a white powder or loose solid, is odorless, and readily absorbs moisture. It is slightly soluble in water; its aqueous solution, known as limewater, is strongly alkaline. It is insoluble in organic solvents such as ethanol and diethyl ether. It is chemically stable at ambient temperature but dehydrates above approximately 580°C to form calcium oxide. It neutralizes acids to form calcium salts and reacts with carbon dioxide to precipitate calcium carbonate. It is corrosive and has disinfecting properties. Calcium hydroxide is widely used in construction, water treatment, agriculture, and the chemical industry, as well as in food processing, papermaking, metallurgy, and environmental protection.
Time period
2021
2026
Geography
China
Macroeconomic value
Business-as-Usual
Data validation
Yes
Technology
Current Technology
Technology comment
Lime slaking dry method is the mainstream technology for calcium hydroxide production. It is produced through the dry slaking reaction of quicklime and water. The product has high activity and low dust pollution, accounting for over 80% of the domestic calcium hydroxide market. This dataset represents the mainstream technology: after the calcium oxide raw materials are crushed, sealed, transported, and stored, they are fed into the slaker to react with a controlled amount of water to generate powdered calcium hydroxide. The core chemical reaction equation of this process is: CaO + H2O → Ca(OH)2.