Share this product :
Calcium Hydroxide - China
- Origin
- : China
- CAS Number
- : 1305-62-0
- HS Code
- : 2522.20.00
Basic Info
- IUPAC Name
- : calcium dihydroxide
- Molecular Formula
- : Ca(OH)2
- Molecular Weight (g/mol)
- : 74.0900
- Synonyms & Trade Names
- : Calcium hydroxide; Slaked lime; Hydrated lime; E526
- Purity / Assay (%)
- : 95% min
- Grade / Quality Level
- : Industrial Grade
- Physical Form
- : Solid
- Concentration
- : Pure substance
- Appearance / Color
- : White to off-white solid
- Odor
- : Odorless
- Density (g/cm³)
- : 2.2110
- Solubility in Water
- : Slightly soluble (0.16g/100mL)
- Signal Word
- : Warning
- GHS Hazard Class
- : Skin irritant; Eye irritant; Respiratory irritant
- H-Statements
- : H315|H318|H335
- P-Statements
- : P260|P261|P264|P271|P280|P305+P351+P338
- REACH Status
- : Registered
- Drug Precursor Status
- : Non-precursor
- Storage Class (GHS)
- : 10
- Storage Conditions
- : Cool, dry; sealed; away from CO2
Categories
Share this product :
Brief Overview
Calcium hydroxide does not occur naturally since it reacts readily with water (to form hydrated lime) and carbon dioxide to form limestone. This is an exothermic reaction which releases a lot of heat, thus caution must be taken. Calcium oxide vary in the degree of crystallization and cohesion of the crystalline mass and the homogeneity of the matrix.
Manufacturing Process
Method 1: Calcium carbonate is reacted with hydrochloric acid to generate calcium chloride. After which, ammonia is added for neutralization and left to stand for precipitation to occur. The solution is filtered, and sodium bicarbonate is added to generate a calcium carbonate precipitate.
Method 2: Calcium carbonate is heated to a higher temperature to undergo thermal decomposition to form calcium oxide or burnt lime. Calcium oxide is then treated or slaked with water to produce calcium hydroxide on a commercial scale:
CaO + H2O → Ca(OH)2
The calcium oxide is broken down into fine particles of calcium hydroxide in this hydration reaction, which occurs in a continuous hydrator. The particle sizes can be modified through milling to ensure consistent particle size.
