UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
Zinc Powder: Zinc Crushed Hot, Just Below Melting
Zinc has an odd temper: brittle cold, soft enough to roll at 100 to 150 °C, and above 200 °C so tender that it crushes to powder. Thorpe (1913): zinc dust can be made by crushing the metal in a mortar at a heat somewhat below its melting point of 420 °C. Work hot with leather gloves.
The picture: our own drawing.
Utangiye
Half a day
Amabwiriza
1
1
Cut the zinc small
Cut the zinc small
Saw 300 g of zinc into small pieces.
Ibikoresho by'iyi ntambwe:
Ikibumbe cya zenke300 gIbikoresho bikenewe:
Umucumita w'Ibyuma
Umunzani w'ibiro2
2
Heat to just below melting
Heat to just below melting
Heat the pieces in an iron pot above 200 °C but below 420 °C, where zinc melts. Check with a pyrometer.
Ibikoresho bikenewe:
Inkono y'icyuma cyasuwe
Iziko ry'amakara
Pirometero
Uturindantoki tw'Uruhu3
3
Crush in the mortar
Crush in the mortar
Tip a few hot pieces at a time into the mortar and crush them. Hot zinc breaks to powder; reheat what is left whole.
Ibikoresho bikenewe:
Isekuru n'UmuhiniUturindantoki tw'Uruhu4
4
Sieve and store
Sieve and store
Sieve the cooled powder, return the coarse bits for another crushing, and keep the powder in a closed jar.
Ibikoresho bikenewe:
Ishungura rito
Icupa ry'Ikirahure Rifite UmufunikoIbikoresho
1- 300 gUmwanya
Ibikoresho bikenewe
9- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
Iki gishushanyo gikora
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