High Specific Surface Area Calcium Hydroxide

Introduction to High Specific Surface Area Calcium Hydroxide

High Specific Surface Area Calcium Hydroxide refers to a calcium hydroxide powder with a large specific surface area (typically ≥17 m²/g, and can exceed 40 m²/g with additives). Specific surface area is the total surface area per unit mass of a substance and is a key indicator determining its activity, adsorption capacity, and dispersibility. Compared to ordinary calcium hydroxide, high specific surface area calcium hydroxide exhibits superior chemical reactivity and is widely used in high-end environmental protection fields such as heavy metal contamination remediation and advanced wastewater purification.

Powder Characteristics of High Specific Surface Area Calcium Hydroxide

Chemical Characteristics: Calcium hydroxide [Ca(OH)₂] content ≥94%, providing the essential guarantee for high reactivity.

Physical Characteristics: High specific surface area ≥17 m²/g, with a reaction rate 3~8 times faster than ordinary calcium hydroxide. It features a developed pore structure and excellent dispersibility.

Color & Whiteness: No strict requirements, as the primary focus is on activity and reaction efficiency.

Moisture Content: Free moisture content ≤0.5%. The low moisture content effectively prevents the agglomeration of calcium hydroxide particles.

Production Process of High Specific Surface Area Calcium Hydroxide

Quicklime Raw Material → Lime Slaker → Water Mist Dust Collector → Hydrated Calcium Hydroxide

The production of High Specific Surface Area Calcium Hydroxide typically employs a lime slaker with a secondary digestion design. The quicklime raw material undergoes initial digestion in a twin-shaft mixer, followed by secondary digestion in a chain-type stirring digester. By precisely controlling the water-to-lime ratio, temperature, and reaction time, a loose, porous, and highly chemically active calcium hydroxide is generated.

Hydrated Lime Classifier → Hydrated Lime Grinding Mill → High Specific Surface Area Calcium Hydroxide

Subsequently, the hydrated calcium hydroxide is classified by a hydrated lime classifier. The fine powder is collected as the finished product, while coarse particles are sent to a hydrated lime grinding mill for dispersion, grinding, and classification. The final product is High Specific Surface Area Calcium Hydroxide with a 325-mesh sieve passing rate ≥95% and extremely high activity.

Application Fields of High Specific Surface Area Calcium Hydroxide

High-End Environmental Protection: An ideal neutralizing agent and adsorbent for efficient flue gas desulfurization and denitrification, and for deep purification of industrial acidic waste gases (e.g., HCl, HF).

Material Synthesis: Widely used as a high-performance catalyst support in the synthesis of high-end environmental catalysts (e.g., for VOCs purification) and specialty polymer materials.

High-Purity Chemical Industry: An ideal calcium source for preparing high-purity inorganic calcium salts such as reagent-grade calcium carbonate and calcium phosphate. It effectively reduces impurity introduction and enhances product purity.

Pharmaceutical Synthesis: Its rapid ion exchange capability and high specific surface area can accelerate reaction processes and improve reaction selectivity, making it a premium alkaline calcium source for synthesizing high-value-added pharmaceutical intermediates.

Technical Parameters of High Specific Surface Area Calcium Hydroxide

Frequently Asked Questions about High Specific Surface Area Calcium Hydroxide

What precautions should be taken for the storage and use of High Specific Surface Area Calcium Hydroxide?

High Specific Surface Area Calcium Hydroxide should be stored in a dry, ventilated area using double-layer moisture-proof packaging (inner film + woven bag). The recommended storage period should not exceed 3~6 months. For feeding, a sealed, anti-bridging powder conveying system is recommended to prevent secondary moisture absorption.

What is the difference between High Specific Surface Area Calcium Hydroxide and ordinary calcium hydroxide?

High Specific Surface Area Calcium Hydroxide is a calcium hydroxide powder with an extremely high specific surface area (typically ≥17 m²/g, and can exceed 40 m²/g with additives). It features a porous and fluffy structure. Compared to ordinary calcium hydroxide (1~15 m²/g), it offers superior performance in reaction rate, adsorption capacity, and dispersibility.

What is the cost-effectiveness of High Specific Surface Area Calcium Hydroxide?

Although the investment cost for High Specific Surface Area Calcium Hydroxide is higher than that of ordinary calcium hydroxide, its added value and cost-effectiveness are far superior. For example, in environmental protection applications, its ultra-high activity can reduce equipment investment and operational energy consumption. In material synthesis, it can enhance product purity and performance value.