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Ferroboron: Colemanite Reduced by Ferrosilicon above 2000 °C in an Arc Furnace (Hansen, GE, US 982,135, 1911)
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31. Ukwakira 2026DE
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Ferroboron: Colemanite Reduced by Ferrosilicon above 2000 °C in an Arc Furnace (Hansen, GE, US 982,135, 1911)

Ferroboron should carry little carbon, so Hansen reduced the boron mineral colemanite with silicon instead of coke. The silicon takes the oxygen, joins the lime as a calcium silicate slag, and the boron goes into the iron of the ferrosilicon. Result: ferroboron, low in carbon, under a clean slag. Source: Hansen, US 982,135 (1911). Not given: weights, boron content. Picture drawn by Youblob.
Hejuru
1 day

Amabwiriza

1

Dehydrate the colemanite at 450 °C

Heat colemanite to about 450 °C in a suitable container to drive off its water.

Ibikoresho by'iyi ntambwe:

KolemanitiKolemaniti1 as required

Ibikoresho bikenewe:

Ifuru ya muffleIfuru ya muffle
2

Powder and mix with ferrosilicon

Grind it and mix with powdered ferrosilicon: enough silicon to reduce all the boron and slag off the lime. The amount depends on the silicon content of the ferrosilicon.

Ibikoresho by'iyi ntambwe:

FerosilisiyoFerosilisiyo1 as required

Ibikoresho bikenewe:

Isekuru n'UmuhiniIsekuru n'Umuhini
3

Bind and press into pellets

Mix the powder with a binder, e.g. water glass, and press it into pellets.

Ibikoresho bikenewe:

Ikirahure cy'amazi (umuti wa silikate ya sodiyumu)Ikirahure cy'amazi (umuti wa silikate ya sodiyumu)
Imashini ikanda ibininiImashini ikanda ibinini
4

Reduce above 2000 °C

Heat the pellets above 2000 °C, e.g. in a Moissan arc furnace (a ferrosilicon-type resistance furnace also works). Silicon reduces the boron; the calcium silicate slag separates cleanly from the ferroboron.

Ibikoresho bikenewe:

Itanura ry'amashanyarazi rya arcItanura ry'amashanyarazi rya arc

Ibikoresho

2
  • 1
    Kolemaniti
    1 as required
    Umwanya
  • 2
    Ferosilisiyo
    1 as required
    Umwanya

Ibikoresho bikenewe

5

Iki gishushanyo gikora

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Ferroboron

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