Roasting technology for isostatic pressing formed graphite primary roasting

A technology of isostatic pressing and graphite, applied in the direction of inorganic chemistry, non-metallic elements, carbon compounds, etc., can solve the problems of product damage, production cost increase, etc., and achieve the effect of increasing carbonization rate and reducing sand sticking rate

Inactive Publication Date: 2018-11-06
SINOSTEEL NEW MATERIAL ZHEJIANG
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the existing technology, during the first roasting process of the graphite green body, yellow sand is often filled into a special pressure roasting device for heat conduction, but the inventor found in the actual production process that when the graphite raw body The billet will volatilize organic gas during the heating process, and the organic gas contains tar components. The tar is easy to bond the surrounding yellow sand to the surface of the graphite product. It must be cleaned before flowing into the next process. Currently, it is common in the industry The best way is to directly cut off the sticky sand part of the graphite product. On the one hand, this method will damage the product, and on the other hand, it will increase the production cost of the product.

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  • Roasting technology for isostatic pressing formed graphite primary roasting
  • Roasting technology for isostatic pressing formed graphite primary roasting
  • Roasting technology for isostatic pressing formed graphite primary roasting

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Embodiment 1

[0038] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0039] A kind of roasting process for isostatic pressing graphite, comprises the following steps:

[0040]Step 1, coating, coating the outer surface of the graphite green body after isostatic pressing with a coating film, so that the graphite green body is isolated from the external environment, wherein the coating film is an organic coating film;

[0041] Step 2, filling the bottom material, filling the bottom of the pressure roasting device with a filler material with heat transfer properties, the thickness of the filler materi...

Embodiment 2

[0061] Components that are the same as or corresponding to Embodiment 1 use the corresponding reference numerals as in Embodiment 1. For the sake of simplicity, only the differences from Embodiment 1 will be described below. This embodiment two and image 3 The difference of the shown embodiment one is:

[0062] In the step 1, the organic coating film is a wood chip coating layer, and the wood chip coating layer is a wooden box whose shape is larger than the graphite green body, and the bottom of the wooden box is filled with wood chips with a thickness of 2 to 3 mm and compacted to keep the graphite green body level, and then put the graphite green body into the wooden box.

[0063] It should be noted that, in this embodiment, wood chips are selected as the organic coating layer. When the inventors carried out actual production, they found that using wood chips as the organic coating layer was more effective than using kraft paper as the graphite product produced by the orga...

Embodiment 3

[0066] Components that are the same as or corresponding to Embodiment 1 use the corresponding reference numerals as in Embodiment 1. For the sake of simplicity, only the differences from Embodiment 1 will be described below. This embodiment three and image 3 The difference of the shown embodiment one is:

[0067] Further, as Figure 5 As shown, the whole of the wooden box is a hollow frame structure, and the distance between it and the graphite green body is 1-3mm, and the wood chips with a particle size of 0.1-0.5mm are used to control the graphite green body and the wooden box. When filling the gap between the graphite green body and the wooden box with wood chips, observe and correct the angle α between the axis of the graphite green body and the axis of the wooden box at any time, so that α satisfies, 0≤α<15°, preferably 0°.

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Abstract

The invention provides a roasting technology for isostatic pressing formed graphite. The roasting technology comprises the steps that the outer surface of a graphite green body is coated with a layerof organic coating film uniformly before the primary baking of the graphite green body, so that direct contact between a graphite product and sand is isolated in a roasting process, a carbonization process of the organic coating film is used for absorbing organic gas volatilized during a heating process of the graphite product, and at the same time, a purpose of pressurization is achieved by relying on the self gas expansion generated by the graphite product in the roasting process, so that a pressure roasting device is used for roasting according to a roasting pressure process curve. A technical problem that sand is liable to stick to the surface of the graphite product after roasting in the prior art is solved, and at the same time, the coke separating amount of the product is improved.

Description

technical field [0001] The invention relates to the technology in the field of nuclear graphite production, in particular to a roasting process for isostatic graphite. Background technique [0002] Graphite is used in thermal neutron reactors, and is also expected to be used in fusion reactors. In thermal neutron reactors, it can be used as a neutron moderator in the fuel zone, a reflector material around the fuel zone, and a structural material inside the core. [0003] Nuclear graphite is a graphite material used in the nuclear industry. [0004] Nuclear graphite is used as the core component in the high-temperature gas-cooled reactor and directly contacts all products of nuclear fission. Therefore, the advanced technology of the material itself, the reliability and repeatability of performance, and the large-scale large-scale graphite material manufacturing The stability of nuclear reactors will directly limit the normal service life of nuclear reactors, the comprehensiv...

Claims

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Application Information

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IPC IPC(8): C01B32/205C04B35/52C04B35/64
CPCC01B32/205C04B35/522C04B35/64
Inventor 黄岱李贺曹曙林杨华丰刘涛
Owner SINOSTEEL NEW MATERIAL ZHEJIANG
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