Preparation method of graphite crucible

Abstract

The invention discloses a preparation method of a graphite crucible. The preparation method comprises the following steps: S1, raw material preparation: raw materials comprise graphite scraps, an Acheson furnace petroleum coke resistance material, an Acheson furnace petroleum coke thermal insulation material and medium-temperature coal pitch; s2, burdening: graphite is crushed and ground into graphite powder, then the graphite powder is mixed with the Acheson furnace petroleum coke resistance material, the Acheson furnace petroleum coke resistance material and the Acheson furnace petroleum coke heat preservation material according to the mass ratio of 3: 2: 5, the mixture is ground into mixed powder, the mixed powder is mixed with medium-temperature coal pitch, the mass percent of the mixed powder in the mixing process is 65%-85%, and the medium-temperature coal pitch is obtained; the mass percent of the medium-temperature coal pitch is 15%-35%; s3, mixing and kneading; s4, profiling is conducted; s5, roasting; and S6, processing. A hot-pressing cold-out one-time forming method is adopted, the obtained product is excellent in performance and shows good thermal shock resistance, ablation performance, leakage-proof performance and mechanical strength, and the preparation process has the advantages in the aspects of saving energy, protecting the environment, shortening the period and improving the aging efficiency.

Description

technical field [0001] The invention relates to the technical field of graphite, in particular to a preparation method of a graphite crucible. Background technique [0002] Because graphite has the characteristics of high temperature resistance, oxidation resistance, and stable chemical properties, crucible containers made of graphite are widely used in lithium battery negative electrodes, purification of diamond carbon source materials, rare earth smelting, precious metal smelting and other industries that require high temperature heat treatment. [0003] Traditionally, graphite crucibles are manufactured by machining graphite electrode blanks. Yet there is following problem in the method for producing crucible with graphite electrode processing: [0004] 1. The crucible processed with artificial graphite electrodes needs to cut off the core of the electrode, and the utilization rate of the electrode is only 20-30%. The waste of materials is huge, and the product cost is h...

AI Technical Summary

Problems solved by technology

[0004] 1. The crucible processed with artificial graphite electrodes needs to cut off the core of the electrode, the utilization rate of the electrode is only 20-30%, the waste of material is huge, and the product cost is high, which is not conducive to the large-scale use of the crucible downstream enterprises

[0005] 2. Restricted by the electrode forming method and formula, the product structure of the crucible processed with artificial graphite electrodes is anisotropic, with defects in physical indicators and unstable quality

Especially when used for precious metal smelting, the crucible leaks seriously and often cannot meet the requirements of use.

[0006] 3. The production of graphite electrodes requires coal-based or petroleum-based calcined coke, and the manufacturing process of these cokes pollutes the environment and also has high costs. The graphitization process consumes about 6000kw.h of electricity per ton, resources and energy Serious waste

[0007] 4. The graphite electrode production method has a long manufacturing cycle and low production efficiency, which cannot meet the needs of users