Method of using microcrystalline graphite to prepare expanded microcrystalline graphite

Abstract

The invention belongs to the technical field of material preparation, and particularly relates to a method of using the microcrystalline graphite to prepare expanded microcrystalline graphite. The method includes: using microcrystalline graphite as a raw material, and performing chemical intercalation treatment for the first time to obtain primary expandable microcrystalline graphite; performing chemical intercalation treatment on the primary expandable microcrystalline graphite for the second time to obtain secondary expandable microcrystalline graphite; adopting a high-temperature expanding method to expand the secondary expandable microcrystalline graphite in a graphite expanding furnace at 900 DEG C to obtain the expanded microcrystalline graphite. By the method, 200-260-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 expanded microcrystalline graphite from expanded graphite. Background technique [0002] Expanded graphite is a carbon material. Using expandable graphite as raw material, when processed at high temperature (usually 700~1200℃), the substance inserted between the layers of expanded graphite decomposes rapidly, and the generated gas forms a high pressure in the interlayer of expandable graphite and is high in the c-axis direction. Expansion, the bulk density changes from 0.7~1.8g / cm3 to 0.003~0.03g / cm3, and the expansion ratio reaches tens to hundreds of times. Due to its loose structure, porous and worm-like structure, large surface area and high surface energy, expanded graphite has excellent liquid phase adsorption performance, good plasticity, good flexibility, ductility and sealing, so it is widely used in environmental protecti...

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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

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