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Pressurization roasting method for carbon

A roasting and carbon technology, applied in the field of carbon roasting technology, can solve the problems of long heating curve, product cracking, cracked waste products, etc., and achieve the effect of reducing cracked waste products, reducing temperature difference, and uniform heating

Active Publication Date: 2011-11-23
福建兴朝阳硅材料股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The characteristics of the roasting process: the heating curve of the product is long; the energy consumption is high; it is easy to produce cracked waste products, even the product cracks, and the qualified rate is low

Method used

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Embodiment Construction

[0024] The following examples will further illustrate the present invention.

[0025] Following embodiment adopts existing carbon ring type roaster, and described carbon pressure roasting method comprises the following steps:

[0026] 1) Place the pressed green product in a sagger, and add calcined petroleum coke between the product and the sagger, the particle size of which is 6-2 mm; the sagger is made of stainless steel; The pipes are connected directly to the outside of the furnace, and vacuum pressure gauges and valves are installed on the seamless pipes extending outside the furnace in sequence; the distance between the wall of the sagger and the product is not less than 100mm.

[0027] 2) Seal the sagger after filling the product, vacuumize, and then fill with nitrogen; the vacuum degree of the vacuum is less than -0.093MPa, and after maintaining for 40min, fill with nitrogen, and the pressure of nitrogen is 1.5MPa.

[0028] 3) Put the sagger in the roasting furnace, h...

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Abstract

The invention provides a pressurization roasting method for carbon, and relates to a carbon roasting process. The pressurization roasting method for the carbon can avoid shell wastes, reduce the crack wastes caused by temperature difference and shorten the roasting time. The method comprises the following steps of: placing a compression green body product in a saggar, and filling a filler betweenthe product and the saggar; and after the product is filled in the saggar, sealing and vacuumizing, inflating nitrogen, placing in a roasting furnace, and heating, wherein the pressure is kept 2.5 to1.5 MPa, and when the pressure exceeds an upper limit, the pressure can be released through a valve and the valve is closed when the pressure is close to the lower limit. By using the anaerobic state, the shell wastes are avoided. By using the saggar, the periphery of the product is heated uniformly, the temperature difference among positions of the product can be reduced and the crack wastes caused by the temperature difference are reduced. An 804-hour roasting curve is performed for roasting and the roasting time can be reduced by about 12 percent. Through experiment, under the same condition, compared with the conventional carbon roasting method, the pressurization roasting method can obviously improve the product yield, coking rate, volume density and recovery yield.

Description

technical field [0001] The invention relates to a carbon roasting process, in particular to a carbon pressurized roasting method. Background technique [0002] Roasting is the key process of carbon production. The roasting process is to put the carbon green body in the roasting furnace, and carry out high-temperature treatment under the protection of the filler to carbonize the pitch in the green body. At high temperature, the light fraction of coal tar pitch is volatilized, and the rest is coked, and the coke particles and fine powder are firmly combined, so that the roasted carbon green body has high mechanical strength, low electrical resistance, and good thermal and chemical stability. [0003] Chinese patent CN101654239 discloses an isotropic graphite product and its preparation method. Its raw materials include binder and aggregate. Purified natural microcrystalline graphite accounts for 30% to 100% of the aggregate mass, and the rest is graphite return material. At...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02
Inventor 龚炳生
Owner 福建兴朝阳硅材料股份有限公司
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