Natural flake graphite normal-pressure low-temperature expansion method

Abstract

The invention provides a natural flake graphite expansion method which is simple and convenient in process and low in energy consumption, directly obtains expanded graphite with the expansion volume of not less than 300mL / g at normal pressure and low temperature (less than 100 DEG C), and belongs to the technical field of inorganic non-metallic materials. The method comprises the following specific steps: 1) putting 50-325 mesh natural flake graphite into a beaker, adding an intercalating agent and an auxiliary agent, and uniformly stirring by using a glass rod; and 2) dropwise adding an oxidant solution, standing, heating to 55-95 DEG C, keeping the temperature for 0.5-3 h, cooling, and washing until a filtrate is neutral to obtain the expanded graphite with the expanded volume of not less than 300mL / g. The method has the advantages of low chemical reagent consumption, easy treatment of waste liquid, low energy consumption, and realization of continuous large-scale production.

Description

technical field [0001] The invention provides a natural flake graphite expansion method with simple process and low energy consumption, which can directly obtain expanded graphite with an expansion volume not less than 300mL / g under normal pressure and low temperature (<100°C), and belongs to the technical field of inorganic non-metallic materials . Background technique [0002] Graphite is a hexagonal planar layered structure composed of carbon elements in three-dimensional space. The carbon atoms in the layer are combined in the form of covalent bonds, and the bonding force is strong; while the interlayers are bonded by van der Waals force, with a large distance and weak bonding force. Under certain conditions, small molecular chemical substances (acids, alkali metals, salts, etc.) can enter the graphite interlayer and combine with carbon atoms to form graphite intercalation compounds (Graphite Intercalation Compounds, GIC). When this interlayer compound is heated to a...

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Problems solved by technology

[0004] However, the above methods have the disadvantages of high energy consumption, small expansion volume, and large environmental pollution, resulting in serious waste of resources and energy.

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