Preparation method of emission-free expansible graphite and smokeless preparation method of sulfur-free expanded graphite
An expanded graphite, no emission technology, applied in the directions of graphite, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of polluting the environment, large sewage discharge, large smoke, etc., and achieve the effect of cleaning the working environment
Active Publication Date: 2019-10-25
哈尔滨市兴显卓科技有限公司
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Problems solved by technology
[0005] The present invention aims to solve the technical problems of large sewage discharge, large smoke and environmental pollution during the expansion of the existing expandable graphite, and provides a preparation method of non-emission expandable graphite and sulfur-free and smoke-free expandable graphite
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specific Embodiment approach 1
[0022] Specific embodiment one: the preparation method of the non-emission expandable graphite of this embodiment is carried out according to the following steps: the flake graphite and the perchloric acid aqueous solution with a mass percentage concentration ≥ 40% are mixed at a temperature of -20°C to 50°C Stir evenly to obtain expandable graphite without emission.
specific Embodiment approach 2
[0023] Embodiment 2: This embodiment differs from Embodiment 1 in that the particle size of the graphite flakes is 30-120 mesh; other aspects are the same as Embodiment 1.
specific Embodiment approach 3
[0024] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the mass percent concentration of the perchloric acid aqueous solution is 45% to 80%; other aspects are the same as Embodiment 1 or Embodiment 2.
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Abstract
The invention discloses a preparation method of emission-free expansible graphite and a smokeless preparation method of sulfur-free expanded graphite, relates to expansible graphite and a preparationmethod of expanded graphite, and aims to solve technical problems that a large amount of wastewater is discharged in an expansible graphite preparation process and large smoke is generated and the environment is polluted when the expansible graphite is puffed. The preparation method of the expansible graphite comprises the following step: uniformly mixing and stirring crystalline flake graphite with a perchloric acid solution, so as to obtain the emission-free expansible graphite. The preparation method of the expanded graphite comprises the following steps: assembling a puffing device consisting of a puffing furnace, a gas guide tube, an absorption tank, an exhaust tube and a fan; uniformly mixing the emission-free expansible graphite with an acetic acid solution or a propionic acid, andperforming puffing in a puffing furnace, so as to obtain the sulfur-free expanded graphite. The expanded graphite is free of sulfur or nitrogen and is free of heavy metal impurities such as manganeseor chromium, and the product is pure. In the puffing process, not thick smoke is generated, a working environment is clean, and no pollution is caused. The expanded graphite can be applied to fields such as petroleum, chemical engineering, aviation, mechanical engineering and the nuclear industry.
Description
technical field [0001] The invention relates to expandable graphite and a preparation method of expanded graphite. Background technique [0002] Expanded graphite, also known as flexible graphite, is a loose, worm-like carbon material prepared from graphite under a certain process. It is widely used in many fields, and its application range is continuously expanding. [0003] The raw material of expanded graphite is flake graphite, which has a layered crystal structure, and the carbon-carbon (C-C) in the layer is sp 2 The hybridization is combined with each other, and the bond angle is 120° to form a hexagonal structure, and there are super large π-π bonds in the layer, which makes the layer have good conductivity. At the same time, the combined effect of the σ bond between C-C and the delocalized large π bond makes it have ultra-high stability. Graphite layers are combined with each other by weak intermolecular force (van der Waals force), so the layers can be peeled off ...
Claims
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IPC IPC(8): C01B32/225C01B32/22
CPCC01B32/22C01B32/225
Inventor 徐元成江志国郭宏义张振宇王增洋周传刚李学福金太平孙文岐刘文彬张文革巩伦江
Owner 哈尔滨市兴显卓科技有限公司