Purification of ultrafine diamond synthesized by detonation

Ultrafine diamond (UFD) is produced at high pressure and high temperature generated by explosive detonation. A new technology is proposed to purify the UFD by using potassium permanganate and concentrated sulfuric acid as oxidant. The experiment results show that the purifying effect by this technology is satisfactory and is a more efficient, cheaper, and safer purification technology with less pollution and less investment compared with others. It can be put into commercial use. The related principle of the technology is discussed. It is believed that the atomic state oxygen produced during the reaction mechanism is an active substances which would react with the graphite-the main impurity existing in the detonation soot, and the reaction temperature is the key factor in the process.