What are the effects of the purity and fineness of calcium hydroxide on its application effectiveness?

The purity and fineness of calcium hydroxide are the core indicators determining its application effect, reaction efficiency and cost control, with significantly varying impacts across different scenarios.

1. Impact of Purity on Application Effectiveness

Purity of calcium hydroxide refers to the proportion of calcium hydroxide content, with impurities mainly including unconverted calcium oxide, calcium carbonate and silicon dioxide.

Advantages of High Purity

Wastewater Treatment: High content of effective calcium enables faster neutralization of acidic wastewater and precise pH adjustment. It also demonstrates stronger capacity to combine with heavy metal ions to form precipitates, resulting in less sludge and lower treatment costs.

Flue Gas Desulfurization: Low impurity content prevents flue duct scaling and blockage, improves desulfurizer utilization rate, and reduces the operation and maintenance costs of desulfurization systems.

Agricultural Planting: High-purity calcium hydroxide stabilizes pH adjustment of acidic soils without affecting soil microbial activity due to impurity residues. When preparing pesticides, it ensures purer efficacy and reduces potential harm to crops.

Industrial Manufacturing: As a chemical raw material for producing calcium carbonate and bleaching powder, high-purity calcium hydroxide guarantees the quality stability of downstream products.

Disadvantages of Low Purity

Impurities dilute the active ingredients, leading to reduced reaction efficiency per unit dosage. Certain impurities may also trigger side reactions with reactants, compromising the quality of final products or treatment outcomes.

2. Impact of Fineness on Application Effectiveness

The fineness of calcium hydroxide is measured by mesh size or micrometers. A higher mesh size indicates smaller particle size and larger contact area with reactants.

Advantages of High Fineness

Rapid Reaction Scenarios: In fields requiring instantaneous reactions such as flue gas desulfurization and waste gas treatment, high-fineness calcium hydroxide can fully contact acidic gases like sulfur dioxide in a very short time, achieving a desulfurization efficiency of over 95%.

Uniform Mixing Scenarios: When preparing lime mortar and coatings, high-fineness calcium hydroxide offers better dispersibility, preventing mortar delamination and enhancing coating adhesion and flatness.

Fine Chemicals Field: In the production of high-end calcium salt products, ultrafine calcium hydroxide ensures reaction uniformity and improves product purity and particle size consistency.

Disadvantages of Low Fineness

Large particle size leads to slow reaction rates, requiring increased dosage to achieve equivalent effects. In liquid systems, particles tend to settle, causing uneven mixing and affecting the stability of treatment or production processes.

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