Manufacturing method of once-formed graphite crucible

The technology of a graphite crucible and a manufacturing method, which is applied in the field of graphite crucible manufacturing, can solve the problems of high cost, large waste of materials, low production efficiency, etc., and achieve the effects of reducing the manufacturing cost, meeting the requirements for use, and improving the production efficiency.

Inactive Publication Date: 2017-09-08

吉林科工碳业有限公司

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AI-Extracted Technical Summary

Problems solved by technology

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

Abstract

The invention relates to a manufacturing method of a once-formed graphite crucible. The manufacturing method is characterized by comprising the following steps: (1) batching: preparing the following components in percentage by mass: 70%-90% grinding powder prepared by grinding graphite scrap and 10%-30% of medium temperature coal pitch; (2) mixing kneading; (3) compression; (4) roasting; and (5) processing. The major material adopted in the manufacturing method is the graphite scrap which is waste obtained during the production of an electrode, so that the waste reutilization is realized, the average cost of each same-scale product is lowered by 800-1000 yuan, the energy source is saved, the environment is protected, and meanwhile, the manufacturing cost of the graphite crucible is lowered. Compared with a graphite crucible produced from a traditional graphite electrode, two procedures of impregnation and graphitization in which the environmental pollution may be caused and the energy sources are greatly consumed are reduced; and compared with a graphite electrode crucible, the average production cycle is shortened by 30-40 days, the energy conservation and emission reduction are achieved, and the production efficiency is greatly improved. According to the graphite crucible produced by virtue of the technical scheme, the longitudinal layout of aggregate particles is avoided, the structure of a product is isotropic, an anti-seepage effect is achieved, and the smelting use requirements of heavy and noble metals are well met.

Technology Topic

ScrapGraphite electrode +10

Examples

Experimental program(3)

Example Embodiment

[0029] Example 1

[0030] The manufacturing method of the disposable graphite crucible of the present invention includes the following steps:

[0031] a. Raw material preparation: broken graphite, true density 2.13g/cm 3 , Ash content 0.03%, volatile matter 0.22%, moisture 0.09%; medium temperature coal pitch, ash content 0.20%, volatile matter 64.2%, moisture 0.06%;

[0032] b. Ingredients: Use a ball mill to grind graphite into graphite powder, the mass percentage is 80%, and the purity is 80% when sieved with a 200-mesh international standard sieve;

[0033] The mass percentage of medium temperature coal pitch is 20%;

[0034] The composition of graphite powder particle size and mass percentage is as follows:

[0035] 3% graphite powder with 1mm particle size;

[0036] 0.5-0.15 grain size graphite powder 39%;

[0037] -40% graphite powder with a particle size of 0.075;

[0038] Graphite powder of other particle size is 18%.

[0039] C. Kneading: Pour the graded ingredients into the kneading pot for stirring. The kneading pot itself is externally heated by heat-conducting oil, and there is a reamer inside for material mixing. The heat-conducting oil inlet temperature of the kneading pot: 233℃, down to the pitch in the kneading pot Temperature 165°C, dry mixing time for kneading: 40 minutes, temperature 126°C; Wet mixing time for kneading: 45 minutes, temperature 168°C;

[0040] d. Pressing: Pour the kneaded paste into the forming container, and press the paste into a crucible in the forming container by a press. The tamping pressure of the pressing is 20Mpa, the forming pressure is 20Mpa, and the pressing time is 4 minutes. ;

[0041] e. Roasting: Put the compacted green body into an industrial ring roasting furnace, and gradually heat it according to the heating curve in the reducing atmosphere, 150-350℃, temperature rise rate 4.4℃/h, duration 45h; 350- 400℃, temperature rise rate 1.7℃/h, duration 30h, 400-500℃, temperature rise rate 1.25℃/h, duration 80h, 500-600℃, temperature rise rate 1.8℃/h, duration 57h, 600 -700℃, temperature rise rate 3.8℃/h, duration 27h, 700-800℃, temperature rise rate 5.0℃/h, duration 20h, 800-1000℃, temperature rise rate 8.0℃/h, duration 25h, 1000-1200℃, temperature rise rate 8.3℃/h, duration 20h, 1200℃ holding time 20h;

[0042] f. Processing: After the product is cooled to room temperature, clean the surface filler and process it into the corresponding size according to the processing drawing provided by the customer.

Example Embodiment

[0043] Example 2

[0044] The manufacturing method of the disposable graphite crucible of the present invention includes the following steps:

[0045] a. Raw material preparation: broken graphite, true density: 2.14g/cm 3 , Ash content: 0.03%, volatile matter: 0.21%, moisture: 0.07%; medium temperature coal pitch, ash content: 0.19%, volatile matter: 63.2%, moisture: 0.05%;

[0046] b. Ingredients: Use a ball mill to grind graphite into graphite powder with a mass percentage of 90%. The purity of the graphite powder is 85% through a 200-mesh international standard sieve;

[0047] The mass percentage of medium temperature coal tar pitch is 10%;

[0048] The composition of the graphite powder particle size and mass percentage is as follows:

[0049] 1mm graphite powder 2%;

[0050] 37% graphite powder with 0.5-0.15 granularity;

[0051] -38% of graphite powder with a particle size of 0.075;

[0052] 23% graphite powder of other particle size;

[0053] C. Kneading: Pour the graded ingredients into the kneading pot for stirring. The kneading pot itself is externally heated by heat-conducting oil, and there is a reamer inside for material mixing. The inlet temperature of the heat-conducting oil in the kneading pot: 230℃, down to the pitch in the kneading pot Temperature 162°C, dry mixing time for kneading: 40 minutes, temperature 118°C; Wet mixing time for kneading: 45 minutes, temperature 162°C;

[0054] d. Pressing: Pour the kneaded paste into the forming container, and press the paste into a crucible in the forming container by a press. The tamping pressure of the pressing is 20Mpa, the forming pressure is 20Mpa, and the pressing time is 4 minutes. ;

[0055] e. Roasting: Put the compacted green body into an industrial ring roasting furnace, and gradually heat it according to the heating curve in the reducing atmosphere, 150-350℃, temperature rise rate 4.4℃/h, duration 45h; 350- 400℃, temperature rise rate 1.7℃/h, duration 30h, 400-500℃, temperature rise rate 1.25℃/h, duration 80h, 500-600℃, temperature rise rate 1.8℃/h, duration 57h, 600 -700℃, temperature rise rate 3.8℃/h, duration 27h, 700-800℃, temperature rise rate 5.0℃/h, duration 20h, 800-1000℃, temperature rise rate 8.0℃/h, duration 25h, 1000-1200℃, temperature rise rate 8.3℃/h, duration 20h, 1200℃ holding time 20h;

[0056] f. Processing: After the product is cooled to room temperature, clean the surface filler and process it into the corresponding size according to the processing drawing provided by the customer.

Example Embodiment

[0057] Example 3

[0058] The manufacturing method of the disposable graphite crucible of the present invention includes the following steps:

[0059] a. Raw material preparation: broken graphite, density: 2.14g/cm 3 , Ash content: 0.03%, volatile matter: 0.20%, moisture: 0.07%; medium temperature coal pitch, ash content: 0.19%, volatile matter: 63.5%, moisture: 0.04%;

[0060] b. Ingredients: Use a ball mill to grind graphite into graphite powder, with a mass percentage of 70%. The purity of the graphite powder is 75% through a 200-mesh international standard sieve;

[0061] The mass percentage of medium temperature coal tar pitch is 30%;

[0062] The composition of the graphite powder particle size and mass percentage is as follows:

[0063] 1mm graphite powder 4%;

[0064] 42% graphite powder of 0.5-0.15 granularity;

[0065] -37% graphite powder with a particle size of 0.075;

[0066] 17% of graphite powder of other particle size;

[0067] C. Kneading: Pour the graded ingredients into the kneading pot for stirring. The kneading pot itself is externally heated by heat-conducting oil, and there is a reamer inside for material mixing. The inlet temperature of the heat-conducting oil in the kneading pot: 230℃, down to the pitch in the kneading pot Temperature 163℃, dry mixing time for kneading: 40 minutes, temperature 124℃; wet mixing time for kneading: 45 minutes, temperature 165℃;

[0068] d. Pressing: Pour the kneaded paste into the forming container, and press the paste into a crucible in the forming container by a press. The tamping pressure of the pressing is 20Mpa, the forming pressure is 20Mpa, and the pressing time is 4 minutes. ;

[0069] e. Roasting: Put the compacted green body into an industrial ring roasting furnace, and gradually heat it according to the heating curve in the reducing atmosphere, 150-350℃, temperature rise rate 4.4℃/h, duration 45h; 350- 400℃, temperature rise rate 1.7℃/h, duration 30h, 400-500℃, temperature rise rate 1.25℃/h, duration 80h, 500-600℃, temperature rise rate 1.8℃/h, duration 57h, 600 -700℃, temperature rise rate 3.8℃/h, duration 27h, 700-800℃, temperature rise rate 5.0℃/h, duration 20h, 800-1000℃, temperature rise rate 8.0℃/h, duration 25h, 1000-1200℃, temperature rise rate 8.3℃/h, duration 20h, 1200℃ holding time 20h;

[0070] f. Processing: After the product is cooled to room temperature, clean the surface filler and process it into the corresponding size according to the processing drawing provided by the customer.

PUM

Property	Measurement	Unit
True density	2.0 ~ 2.13	g/cm³
True density	2.14	g/cm³
Density	2.14	g/cm³

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Energy saving
protect environment

Manufacturing method of once-formed graphite crucible

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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