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New technology you don't know-graphene crushing and grinding
At present, the preparation methods for the production of graphene are mainly mechanical method, oxidation method, substrate growth method and liquid phase method, etc. Most of these production technologies and methods have disadvantages such as low output, high energy consumption and poor quality, thus stopping the production and development of graphene in China. After unremitting efforts, Nantong Fulack Graphene Production Research Group has invented a graphene production line that integrates high-speed dispersion, crushing and grinding, vortex cavitation and shear ultrasound, which directly disperses graphite sheets continuously in liquid phase and continuously peels off graphite sheets. It has realized the production of high-quality graphene through mechanical shearing, hydraulic cavitation and other technical means, which is favored by the majority of graphene manufacturers.
Graphene production equipment is a high-tech advanced equipment that uses mechanical hydraulic shearing and cavitation to peel off graphite sheets to produce high-quality graphene such as single-layer and multi-layer. The invention and application of this advanced technology has accelerated the pace of graphene production to a certain extent, and also promoted the confidence of graphene manufacturers to carry out large-scale, high-efficiency, low-cost, and pollution-free production. Moreover, this production process of mechanical hydraulic shearing and cavitation vortex stripping graphite sheet has the characteristics of simple operation, safety and reliability, no oxidation, no high temperature, and high quality products, which is very suitable for large-scale production of high-quality graphene.
Main structure of graphene production equipment
The main structure of graphene production equipment: it is composed of high-shear dispersion mixing batching tank, fine dispersion grinding machine, hydraulic vortex cavitation device, high-shear cyclone ultrasonic device, multi-pipe condenser, ultrasonic storage tank, integrated control system, pressure gauge temperature controller, etc.
Graphene production equipment process
Graphene production process flow: firstly, graphite powder, dispersant or surface modifier and water are mixed in a high-shear dispersion mixing batching tank for dispersion and stirring, the circulation valve is closed first, and then the connecting valve between the storage tank and the dispersion grinding pump is opened, so that the graphite solution passes through a fine dispersion grinding machine, a hydraulic shear vortex cavitator, and then enters the high-shear vortex ultrasonic accumulator and other process processes through pressure. When there is no material in the batching tank, the lower connecting valve will be automatically closed and the circulating valve will be opened to allow the graphite solution to continuously circulate and peel off the sheets so that the graphene single layer and multi-layer can achieve the desired effect. The pressure control, time control and temperature control designed in the integrated control system can also be controlled by computer or touch frequency control or full-automatic control.
Graphene production equipment working principle
The working principle of graphene production equipment is as follows: firstly, graphite powder, dispersant or surface modifier and water are added into a storage tank for high-speed dispersion and stirring, and then dispersion and stirring are carried out by a high-speed dispersing machine to prepare a graphite solution with good dispersion stability. The graphite solution enters a fine dispersion grinding chamber through a special crushing, cutting and stripping device to quickly disperse, shear and crush the particles such as powder, sticky blocks and agglomerates in the graphite solution, then it is sucked into the shearing and crushing peeling zone, and the rotor blade and the stator blade are cut at relatively high speed in a very narrow working passage, resulting in strong friction and grinding and cutting peeling. Under the action of mechanical movement and centrifugal force, the stripped graphite is re-pressed into the cutting and stripping zone for grinding and crushing. The fine grinding is divided into three stages. The more outward the first stage is extended, the higher the precision of the grinding sheet is, the smaller the tooth pitch is, the longer the linear speed is, the more the graphite sheet is stripped and ultra-thin, and the fluid gradually extends to the radial composition curve. The direction speed of each level of fluid changes instantaneously, and is subjected to tens of millions of times per minute of high-speed shearing, strong friction, extrusion grinding, particle crushing, etc., after passing through tens of millions of times of high-speed shearing, grinding and crushing in the three fine grinding zones, resulting in graphite molecular chain breakage, lamellar cutting and tearing, etc. Then it enters the hydraulic vortex shear cavitation generator through the high-pressure pipe; the hydraulic vortex shear cavitation technology is a process in which the graphite solution flows into the vortex low-pressure zone to form vapor voids, when the pressure in the graphite solution is reduced to below the saturated vapor pressure, the bubbles formed by the hydraulic shear cavitation process begin to appear and grow, and with the extension of time, the voids expand, grow, compress and collapse. However, this process is explosive. In less than 1,000 minutes and 6 seconds, the cavitation bubble can release huge energy at the moment of sharp collapse, instantly generate local high temperature (1900-5000K) and high pressure (up to 140Mpa-170Mpa), and generate micro-jet with a speed of about 110 m/s and strong impact force, thus causing a series of phenomena such as cavitation erosion, cavitation noise, vibration and luminescence, these effects of cavitation are often referred to as the hydrodynamic vortex shear cavitation effect, which causes the graphite sheet to peel off single-layer and multi-layer graphene. Then re-enter the new hydraulic shear cavitation swirl ultrasonic generator through the pipeline, so that the graphite solution is under the action of high-speed jet shear impact and swirl cavitation ultrasonic, and the graphite layer is not cut and peeled off to produce high-quality single-layer and multi-layer graphene into the storage tank, and then re-enter the fine disperser and hydraulic vortex cavitation device through the condenser reflux pipeline, the whole cutting and stripping process of graphene solution is subjected to strong cutting and uninterrupted stripping under the effects of high-speed impact cutting, hydraulic shear vortex cavitation, cyclone ultrasonic cavitation and other effects in a closed pipeline, so as to achieve better quality single-layer and multi-layer graphene. This mechanical hydraulic cavitation stripping graphene process method can effectively promote and promote the large-scale, high-efficiency, low-cost and pollution-free production of graphene.
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