What is high surface area calcium hydroxide?

The production process of High Surface Area Calcium Hydroxide involves several key steps:

‌Raw Material Preparation‌：

Select appropriate calcium and phosphorus sources, such as calcium chloride, calcium nitrate, or calcium acetate for the calcium solution, and sodium phosphate dibasic (Na2HPO4) or ammonium dihydrogen phosphate (NH4H2PO4) for the phosphate source.

‌Solution Preparation‌：

Dissolve the selected calcium salt in water to form a calcium solution.

‌Phosphate Addition‌：

Slowly add the phosphate source to the calcium solution while stirring continuously.

‌pH Adjustment‌：

Adjust the pH of the solution using either acid or base. Citric acid or acetic acid can be added to adjust the pH towards acidic conditions, while sodium hydroxide or ammonium hydroxide can be used for basic conditions.

‌Heat Treatment‌：

Conduct a heat treatment step to promote crystallization and sintering of the hydroxyapatite particles. This is typically done at a controlled temperature for a specific duration in a furnace or muffle furnace.

‌Grinding and Milling‌：

Perform another round of grinding and milling to obtain fine powdered hydroxyapatite. This helps in further reducing particle sizes and ensuring uniformity.

‌Washing and Drying‌：

Thoroughly wash the obtained powder with deionized water to remove any impurities or unreacted reagents. The washed powder can then be dried under controlled conditions.

‌Post-Treatment (Optional)‌：

Depending on application requirements, the powder can be subjected to post-treatment processes such as surface modification or sterilization.

It’s important to note that the specific conditions and parameters of each step, such as temperature, stirring speed, and reaction time, need to be carefully controlled to achieve the desired high surface area and other properties of the final product.

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