IṢẸ́ ỌNÀ
ẸWÀ ÀTI ÌLERA
IṢẸ́ ỌWỌ́
ÀṢÀ ÀTI ÌTÀN
ÌṢERÉ
ÀYÍKÁ
OÚNJẸ ÀTI OHUN MÍMU
REVERSE ENGINEERING
SÁYẸ́ǸSÌ
ERÉ ÌDÁRAYÁ
ÌMỌ̀-Ẹ̀RỌ
ÀWỌN OHUN WÍWỌ̀
Carbon as Pure Graphite: Coke and Sand Heated round a Coke Core in an Electric Furnace (Acheson, US 568,323)
Acheson found that carbon heated on its own hardly turns to graphite, but carbon first bound to silicon does. Coke and sand packed round a coke core form silicon carbide when the current heats the core; hotter still, the silicon boils away and the carbon is left as pure graphite, which grows outward as the core.
Result: pure carbon in its graphite form, sorted like native graphite.
Source: E. G. Acheson, US patent 568,323 (1896), pp. 1-3 and drawing (shown above). The furnace runs at hundreds of volts and up to 1000 amperes.
Ilọsíwájú
2 days
Ìlànà
1
1
Mix the charge
Mix the charge
Grind and mix powdered coke, sand, salt and sawdust thoroughly, the coke about half the weight (50 parts coke to 50 parts silica and other materials).
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Èédú metalurgi50 partsÀwọn irinṣẹ́ tí a nílò:
Iyanrìn
Sodium chloride (iyọ̀)
Erùpẹ̀ igi
Odó àti Ọmọ Odó2
2
Build the furnace
Build the furnace
Build a furnace of firebrick with carbon electrodes through the two end walls. Lay a core of granular coke between the electrodes (Acheson's was 7 ft long by 4 in wide) and pack the mixture all round it.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Èédú metalurgi1 granular, for the coreÀwọn irinṣẹ́ tí a nílò:
Bíríkì Tí Ń Kojú Iná
Elektrode graphite3
3
Run the current
Run the current
Turn on the current, at first about 650 V and 50 A. The core heats, and silicon carbide forms round it; as the heat rises further the carbide breaks up, silicon goes off as vapour and graphite is left, carrying more current. Near the end it is about 100 V and 1000 A. Stop before the graphite reaches the walls. Ours: a step-down transformer as the supply.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ Ìdínkù FóltéèjìElektrode graphite4
4
Take out the graphite
Take out the graphite
When cool, separate the graphite from the core and the unchanged mixture, and grade it like native graphite.
Àwọn irinṣẹ́ tí a nílò:
Odó àti Ọmọ OdóÀwọn ohun-èlò
1- 1 granular, for the coreÀyè
Àwọn irinṣẹ́ tó nílò
7- Àyè
- Àyè
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