How to reduce free boron in boron carbide?
1. Water washing: Repeated washing with pure water or acidic solution can dissolve and remove free boron.
2. Pickling: Using acidic solutions, such as hydrochloric acid (HCl), nitric acid (HNO3), etc., pickling can dissolve and remove free boron.
3. Alkaline washing: Use alkaline solutions, such as sodium hydroxide (NaOH), potassium hydroxide (KOH), etc. Alkaline washing can react with free boron to remove free boron.
4. Oxidation treatment: Use oxidants, such as hydrogen peroxide (H2O2), potassium permanganate (KMnO4), etc., to oxidize free boron into insoluble matter, and then filter or precipitate to separate.
For the removal of free boron impurities in boron carbide powder, some reagents can be considered. Here are some commonly used reagents:
Acidic solutions: Free boron can be dissolved and removed using acidic solutions. Commonly used acids include hydrochloric acid (HCl), nitric acid (HNO3), etc. Boron carbide powder can be soaked in an acidic solution and then filtered or centrifuged.
Alkaline solution: Use an alkaline solution to react with and remove free boron. Commonly used bases include sodium hydroxide (NaOH), potassium hydroxide (KOH), etc. Boron carbide powder can be soaked in an alkaline solution and then filtered or centrifuged.
Oxidizing agents: The use of oxidizing agents oxidizes free boron and converts it into insoluble species. Commonly used oxidants include hydrogen peroxide (H2O2), potassium permanganate (KMnO4), etc. Boron carbide powder can be reacted with an oxidizing agent and then filtered or centrifuged.