Low-cost large-scale continuous production equipment and technology for high-purity graphite worms

A graphite worm and production process technology, applied in the field of low-cost, large-scale continuous production equipment and processes, can solve the problems of low efficiency, high electricity cost, low microwave conversion efficiency and the like

Active Publication Date: 2016-11-16
苏州鼎烯聚材纳米科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

U.S. Patent 2006 / 0241237A1 and US7550529B2 use microwave heating to produce the worms. Electric or microwave heating can reduce the increase of impure components caused by natural gas and fossil fuel heating expandable graphite to produce worms, but the same heat, electric heating and microwave heating are produced. The cost is much higher. Firstly, the cost of electricity is high, the cost of microwave heating equipment is high, and the efficiency of converting electric energy into microwave is only about 80%.
However, a large part of the heat generated by electricity is carried out by the carrier gas and is not used to heat the expandable graphite. Therefore, there are three problems to be solved in microwave heating of expanded graphite, 1) high equipment cost, 2) low microwave conversion efficiency, and 3) Lower thermal efficiency

Method used

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  • Low-cost large-scale continuous production equipment and technology for high-purity graphite worms
  • Low-cost large-scale continuous production equipment and technology for high-purity graphite worms

Examples

Experimental program
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Embodiment 1

[0028] A low-cost, large-scale continuous production facility for high-purity graphite worms such as figure 1 As shown, the main body of the equipment is a high-temperature microwave expansion furnace 1 with a conical bottom. The feed inlets are connected, and a nitrogen inlet 4 is provided above the high-temperature microwave expansion furnace 1 , and the nitrogen inlet 4 communicates with the outlet of the screw feeder 7 . The bottom of the high-temperature microwave expansion furnace 1 is connected to the outlet 5 of expanded graphite worms with a cooling metal pipe and an air locker. The inside of the outlet 5 of the expanded graphite worm is a cooling zone for the graphite worm to cool down before leaving the closed system. The outlet of the expanded graphite worm is a metal pipe, and the cooling zone reduces the temperature of the graphite worm to below 100 degrees and close to room temperature. The length is based on the actual Production can be set from 0.5 to 5 meter...

Embodiment 2

[0038] Concrete structure is the same as embodiment 1, differs from embodiment 1 in the simplification of dispersion disc and heating equipment, equipment schematic diagram is as follows figure 2 As shown, a microwave source 2 is arranged around the high-temperature microwave expansion furnace 1, and an electric heater 3 and a dispersing disk 9 for expandable graphite powder are arranged on the upper part of the high-temperature microwave expansion furnace 1. The top of the dispersion disc is below the discharge port of the screw continuous feeder 7. The expandable graphite powder falls into the microwave heating area from the space on both sides of the dispersing disc.

[0039] a. The dispersing disc 9 is a conical body, and an electric heater 3 is placed on its surface. The temperature on the surface of the electric heater is 500-700°C, which accounts for 40% to 60% of the electric energy required by the expanded graphite. The inclination of the electric heater The angle i...

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Abstract

The invention relates to a method for producing graphite worms with heating expandable graphite, in particular to low-cost large-scale continuous production equipment and technology for high-purity graphite worms. The low cost large-scale continuous production technology for the high-purity graphite worms comprises the following steps of using the expandable graphite as a raw material, directly and electrically heating expandable graphite powder under inert gas atmosphere, after the expandable graphite powder is slightly expanded, and performing microwave heating to the temperature of 1000-1800 DEG C so that the expandable graphite powder is completely expanded and the graphite worms are obtained. Besides, impurities are gasified to separate from the graphite, so that the purity of the graphite is improved. The microwave heating is different from other heating methods, the graphite worms absorb microwaves to generate heat, so that the temperature of the graphite worms is higher than surrounding temperature, and if the density of microwave energy is higher, the temperature of the graphite worms is higher; and the expandable graphite powder is the expandable graphite powder with sulfuric acid intercalation, or sulfur-free expandable graphite powder, or any expandable graphite powder.

Description

technical field [0001] The invention relates to a method for producing graphite worms by heating expandable graphite, in particular to a low-cost, large-scale continuous production equipment and process for high-purity graphite worms. Background technique [0002] Graphite worms are an important raw material for the production of graphene (CN201510412741.X, "Low-cost mass production of graphene nanopowders"), and high-purity graphite worms are the basis for the production of high-purity graphene. U.S. Patent 2006 / 0241237A1 and US7550529B2 use microwave heating to produce the worms. Electric or microwave heating can reduce the increase of impure components caused by natural gas and fossil fuel heating expandable graphite to produce worms, but the same heat, electric heating and microwave heating are produced. The cost is much higher. First of all, the cost of electricity is high, the cost of microwave heating equipment is high, and the efficiency of converting electric energy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
CPCC01P2006/80
Inventor 邓超然张亚妮
Owner 苏州鼎烯聚材纳米科技有限公司
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