EP0118232A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Methods of manufacturing dense high quality carbon products
Assignee: Development Finance Corp of New Zealand
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Filing: 1984-02-08
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Granted: —
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Expires: 2004-02-08
Abstract
Abstract The invention relates to a process of manufacturing a "green" carbon product from fine particulate bituminous coal. The process involves filling a mould cavity with fine particulate bituminous coal of an acceptable kind, keeping the particulates within the mould in an oxygen free atmosphere at a controlled (critical) temperature at or adjacent the maximum contraction of incipient carbonisation to allow compaction of the particulates to a density level acceptable for further processing to produce high quality forms of carbon. Usually, pressure is sustained on the material within the mould. Where the shape of the product is important heating of the material within the mould to a level of about 700 DEG C follows soaking at the critical temperature so as to minimise cracking during cooling. Such a process is considered suitable for the production of carbon electrodes.
Inventors
- 👤 Alistair William Sheat
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 10:39
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/528; C25; C25B; C25B11/00; C25B11/04; C25B11/042; C25B11/043; C25C; C25C3/00; C25C3/06; C25C3/08; C25C3/12; C25C3/125
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
93 words
A process of manufacturing a "green" carbon product comprising the steps of filling a mould cavity with fine particulate bituminous coal having a percentage of impurities acceptable for the final use to which the carbon product is to be put, keeping the particles within the mould in an oxygen free atmosphere at a control fed temperature (hereinafter referred to as the "critical temperature") at or adjacent the maximum contraction of incipient carbonisation to allow compaction of the particles to a density level acceptable for further processing to produce high quality forms of carbon.
Claim 2
Dependent Claim
93 words
A process of manufacturing a "green" carbon product comprising the steps of filling a mould cavity with fine particulate bituminous coal having a percentage of impurities acceptable for the final use to which the carbon product is to be put, keeping the particles within the mould in an oxygen free atmosphere at a control fed temperature (hereinafter referred to as the "critical temperature") at or adjacent the maximum contraction of incipient carbonisation to allow compaction of the particles to a density level acceptable for further processing to produce high quality forms of carbon.
Claim 3
Dependent Claim
18 words
A process as claimed In claim 1 wherein a pressure is applied to the content of the mould.
Claim 4
Dependent Claim
39 words
A process according to claim 1 or claim 2 wherein said "green" carbon is removed from said mould after cooling and used in a similar way as petroleum coke after the product has been subjected to appropriate size reduction.
Claim 5
Dependent Claim
48 words
A process according to claim 1 or claim 2 wherein said "green" carbon product after soaking at the critical temperature and having attained Its dense form is heated In said mould to a level of about 700°C so as to develop strength sufficient to prevent cracking during cooling.
Claim 6
Dependent Claim
36 words
A process according to claim 1 which Includes using a suitable mould material and raising the temperature of the "green" carbon in the mould to the temperature required for calcination to provide a final carbon form.
Claim 7
Dependent Claim
22 words
A process according to claim 5 wherein said carbon product is finally subjected to calcination at a temperature of above about 1200°C.
Claim 8
Dependent Claim
27 words
A process according to claim 1 which includes the . preliminary step of admixing of said fine bituminous coal with recycled distillation products from said carbonisation process.
Claim 9
Dependent Claim
18 words
A process according to claim 1 wherein said material charged to said mould Is at about ambient temperature.
Claim 10
Dependent Claim
15 words
A process according to claim 1 wherein said material charged to said mould Is preheated.
Claim 11
Dependent Claim
37 words
A process according to claim 1 wherein said bituminous coal particles are treated by one or more beneficiation processes to reduce the ash, iron and other impurities to an acceptable ievel prior to filling said mould cavity.
Claim 12
Dependent Claim
19 words
A process according to claim 1 wherein there is used a bituminous coal having a low neturai ash content.
Claim 13
Dependent Claim
38 words
A process according to claim 1 wherein said mould temperature is controlled at a critical temperature range within the limits of 360°C to 410°C and is held at this temperature for a period of up to two days.
Claim 14
Dependent Claim
23 words
A process according to claim 2 wherein said pressure is applied by means of a weight resting on the top of the coal.
References Cited (Backward Citations)
GB595759A
Cited
GB595760A
Cited
DE854470C
Cited
US2998375A
Cited
GB849414A
Cited
CH593351A5
Cited
GB1484601A
Cited
US4117098A
Cited
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