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Graphite crucible

A graphite crucible and crucible technology, applied in the direction of inorganic chemistry, non-metallic elements, silicon compounds, etc., can solve problems such as no integral graphite, and achieve the effect of improving lifespan and good compactness

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

AI Technical Summary

Problems solved by technology

[0009] So far, there is no integral graphite crucible with a diameter of 1400mm×2100mm at home and abroad

Method used

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Examples

Experimental program
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Embodiment Construction

[0042] The preparation method of described graphite crucible comprises the following steps:

[0043] 1) Add auxiliary materials to the raw material of calcined petroleum coke granules, and sieve them into 4 kinds of granular materials after 3 stages of crushing; 8-4mm: 14%-16%; particle size 4-2mm: 11%-12%; particle size 2-0mm: 26%-25%; the remaining particle size is less than 0.075mm. The auxiliary material is selected from silica fume, etc. The amount of the auxiliary material can be 9% to 4% of the raw material of calcined petroleum coke particles by mass percentage, preferably 6%. The particle size of the auxiliary material is preferably less than 600 mesh.

[0044] 2) Add the prepared calcined petroleum coke particle raw materials and auxiliary materials into the kneading pot and stir, then add liquid pitch to the kneading pot, and continue stirring to make the pitch soak into the petroleum coke particles; the amount of the added liquid pitch can be expressed in mass perc...

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Abstract

The invention provides a graphite crucible and relates to a crucible. The graphite crucible has a size of Phi (1200-1500)mm, an inner diameter of Phi (960-1260)mm and a depth of (1750-1900)mm. The graphite crucible is acquired based on the following steps: adding accessories into a raw material of forged petroleum coke grains, thereby acquiring a mixture; crushing the mixture, adding the mixture into a mixing kneading pot and stirring; adding liquid pitch into the mixing kneading pot and wetting the petroleum coke grains with the pitch; after molding a crucible blank, putting the crucible blank into a crucible roaster for roasting, thereby acquiring a roasted crucible product; steeping the roasted crucible product, thereby acquiring a steeped crucible; and graphitizing the steeped crucible, thereby acquiring the graphite crucible. The graphite crucible is once formed and the surface thereof is directly extruded and rubbed by a grinding tool, so that the compactness of the graphite crucible is better and pores are few. The graphite crucible is subjected to twice high-pressure steeping, so that the surface of the graphite crucible is more compact, the liquid metal is difficult to immerse and the service life is long. A test proves that physicochemical indexes of the acquired graphite crucible are as follows: the volume density is more than 1.75g / cm<3> and the compression strength reaches 25MPa.

Description

technical field [0001] The invention relates to a crucible, in particular to a graphite crucible. Background technique [0002] Artificial graphite crucible has the characteristics of high temperature resistance, oxidation resistance, and low ash content. It is widely used in high-purity metal smelting. It can be used not only as a heating element, but also as a container, and has less pollution to metals. [0003] Existing graphite crucibles have relatively small specifications and can only be processed with high-quality electrodes. The maximum diameter of the extruded electrode is about 700mm, and the crucible can only be limited within this range. [0004] Large crucibles need to be spliced, for example, a crucible with a diameter of 1400mm and a height of 2200mm needs to be spliced ​​by 7 sections. Its disadvantage is that the seam is very easy to leak and oxidize during use. [0005] The overall graphite crucible also needs to go through molding, roasting, graphitiza...

Claims

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Application Information

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IPC IPC(8): C01B33/021C04B35/528C04B35/622
Inventor 龚炳生
Owner 福建兴朝阳硅材料股份有限公司
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