Purification method of superfine silicon carbide powder

• Main Authors: HU ZENGHAN, GENG SIQI, CHENG SHANGXU, TANG MINGLIANG, ZHENG HAI, WU JIAN
• Format: Patent
• Language: Chinese; English
• Published: 11.11.2022
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS

The invention discloses a method for purifying superfine silicon carbide powder, which comprises the following specific steps of: placing superfine silicon carbide powder (D50 is less than or equal to 5mu m) containing trace impurities in a constant-temperature reaction kettle, carrying out acid pickling treatment by taking organic mixed acid as an acid pickling solution to remove iron and oxide impurities thereof, and carrying out flotation on part of free carbon at the same time; putting the ultrafine silicon carbide powder subjected to acid pickling into a rotary electric furnace, and carrying out calcination treatment to remove carbon and residual impurities of organic mixed acid; carrying out alkali washing treatment on the calcined superfine silicon carbide powder in a dilute sodium hydroxide solution to remove silicon and silicon oxide; and carrying out centrifugal cleaning on the superfine silicon carbide powder by adopting ultrapure water, and drying to obtain the superfine silicon carbide powder wit