This diamond purification method is only applicable to diamond micro-powders containing a large amount of iron impurities or ferric oxide.

Firstly, prepare three strong acids: over 90% concentrated sulfuric acid, industrial pure nitric acid, and perchloric acid; a heating device, a 2000W industrial electric furnace.

After preparing the above materials, first keep the crushed diamond mixture dry, and clean the ceramic containers.

3. Place three kilograms of impure diamond mixture in a ceramic container, ensuring the volume is 10 liters.

4. Pour concentrated sulfuric acid into a ceramic container containing the diamond mixture, and immerse it with 3-4 liters. Stir with a rubber rod, then adjust as needed; if the diamond mixture becomes too thick, add an additional 1L of concentrated sulfuric acid.

Place on an electric stove to heat, after 5 minutes of heating, add 400ml of concentrated nitric acid, then heat for another 10 minutes.

6. Add 20ml of perchloric acid; for higher purity, double the amount of perchloric acid can be added. Heat for 2 hours and 40 minutes after heating. Turn off the electric furnace.

During the process, the generated gases can be purified using the wastewater treatment equipment's water tank. The water in the tank is added with sodium hydroxide powder for alkaline treatment to ensure a more thorough reaction with acidic gases.

After cooling, pour off the acid from the top of the diamond acid solution. Then, wearing rubber gloves, add the acidic diamond to clean water, stir to dilute, and pour into a plastic bucket. Rinse with clean water, pour the acidic solution into the acid-base neutralization pool for neutralization. Once the pH reaches 7, discharge. Rinse the acidic solution 8 times to achieve neutrality. At this point, use pH test strips to check; if acidity remains, rinse once more. At this stage, the diamond purification is complete.

9. Drying Process

Weighing and Packaging