Overview
Bleaching slaked lime powder, chemically known as calcium hydroxide (Ca(OH)2), is a versatile compound used primarily in the pulp and paper industry for its bleaching and pH-adjusting properties. It is produced by hydrating quicklime (calcium oxide) and is valued for its high alkalinity and reactivity. In industrial applications, it serves as a cost-effective alternative to more expensive bleaching agents. Its ability to whiten pulp while neutralizing acidic byproducts makes it indispensable in paper manufacturing. Additionally, it finds use in water treatment and construction due to its chemical stability and binding properties.
Physical and Chemical Properties
Bleaching slaked lime powder is a white, odorless powder with a slightly bitter taste. It has a density of 2.21 g/cm³ and decomposes at 580°C, releasing water and forming calcium oxide. Its solubility in water is limited, but it forms a alkaline solution known as limewater. The compound is highly reactive with acids, producing salts and water. This property is leveraged in industrial processes where neutralization is required. Its bleaching action is attributed to its ability to break down lignin in pulp, enhancing the brightness of the final paper product.
Main Applications
The primary use of bleaching slaked lime powder is in the pulp and paper industry, where it acts as a bleaching agent and pH regulator. It helps remove lignin and other impurities from wood pulp, resulting in brighter and higher-quality paper. Beyond paper manufacturing, it is used in water treatment to soften water and remove heavy metals. In construction, it is added to mortars and plasters for its binding properties. Its versatility also extends to agriculture, where it is used to neutralize acidic soils and improve crop yields.
Safety and Storage
Bleaching slaked lime powder is classified as a mild irritant and requires careful handling. Prolonged exposure to dust can cause respiratory irritation, and contact with skin or eyes may lead to burns. Proper protective equipment, such as gloves and goggles, is essential during handling. Storage should be in a cool, dry, and well-ventilated area, away from moisture and acidic substances. Containers must be tightly sealed to prevent caking and degradation. In case of spills, neutralize with a weak acid like vinegar before cleanup.
B2B Procurement Guide
When procuring bleaching slaked lime powder, industrial buyers should prioritize purity (typically 90-95%), particle size (fine powder for better reactivity), and moisture content (below 2%). Supplier certifications, such as ISO or GMP, ensure consistent quality. Price varies based on quantity, purity, and geographic location. Bulk purchases often attract discounts. Buyers should also consider logistics, as the powder is sensitive to moisture during transit. Sampling and lab testing are recommended before large-scale procurement to verify specifications.
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