Method of using microcrystalline graphite to prepare secondary expanded microcrystalline graphite

Abstract

The invention belongs to the technical field of material preparation, and particularly relates to a method of using microcrystalline graphite to prepare secondary expanded microcrystalline graphite. The method includes: using the microcrystalline graphite as a raw material, performing chemical intercalation treatment for the first time, filtering, washing and drying a product obtained after intercalation treatment to obtain primary expandable microcrystalline graphite, and adopting a high-temperature expanding method to expand the expandable microcrystalline graphite in a graphite expanding furnace at 800 DEG C to obtain primary expanded microcrystalline graphite; using the primary expanded microcrystalline graphite as a raw material, performing chemical intercalation treatment for the second time, filtering, washing and drying a product obtained after intercalation treatment to obtain secondary expandable microcrystalline graphite, and adopting a high-temperature expanding method to perform high-temperature expanding on the secondary expandable microcrystalline graphite for the second time in the graphite expanding furnace at 900 DEG C to obtain secondary expanded microcrystalline graphite. By the method, 200-287-multiple secondary expanded microcrystalline graphite materials which are high in multiple, sulfur-free and short in production period can be prepared on a large scale.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and more specifically relates to a method for preparing secondary expanded microcrystalline graphite from microcrystalline graphite. Background technique [0002] Expanded graphite is a carbon material. Using expandable graphite as raw material, when treated at high temperature (usually 700-1200°C), the substance inserted between the expanded graphite layers will decompose rapidly, and the gas generated will form a high pressure in the expandable graphite interlayer domain and expand along the c-axis direction. Expansion, bulk density from 0.7 to 1.8g / cm 3 Change to 0.003~0.03g / cm 3 , the expansion multiple is tens to hundreds of times. Due to the loose structure of expanded graphite, porous and worm-like, large surface area and high surface energy, it has excellent liquid phase adsorption performance, good plasticity, good flexibility, ductility and sealing, so it is widely used ...

AI Technical Summary

Problems solved by technology

[0006] However, there are only two patents related to the preparation of expanded graphite from microcrystalline graphite as raw materials: the Chinese patent application "a kind of expanded graphite environmental protection material using Kish graphite as raw material and its preparation and application" with the notification number CN103738955A reports a kind of Kish graphite Graphite is the preparation method of the expanded graphite environmental protection material of raw material; The Chinese patent application " a kind of method of preparing expanded microcrystalline graphite material with microcrystalline graphite " with notification number CN104556022A reports the preparation of expanded microcrystalline graphite material with microcrystalline graphite as raw material The method, this patent provides a method for preparing expanded graphite microcrystalline material with microcrystalline graphite as raw material, chemical intercalation method and high temperature expansion method are traditional methods for preparing expanded graphite from flake graphite, but in microcrystalline graphite and flake Due to the difference in graphite structure, the effect of using this method to prepare expanded graphite from microcrystalline graphite is not good. The expansion factor of expanded graphite prepared from microcrystalline graphite is not high, and the entry of sulfur-containing elements during the intercalation process makes the product contain sulfur. The volume is high, and a large amount of harmful gases such as sulfur dioxide will be released during the expansion process, polluting the environment