UBUCIKO
UBUHLE NEMPILO
UBUCIKO BEZANDLA
AMASIKO NOMLANDO
EZOKUZIJABULISA
IMVELO
UKUDLA NEZIPHUZO
REVERSE ENGINEERING
IZAYENSI
EZEMIDLALO
UBUCHWEPHESHE
IZINTO EZIGQOKWAYO
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.
Oqalayo
Half a day
Imiyalelo
1
1
Cut the zinc small
Cut the zinc small
Saw 300 g of zinc into small pieces.
Izinto zokwakha zalesi sinyathelo:
Isigaxa Sikazinki300 gAmathuluzi adingekayo:
Isaha Sensimbi
Isikali sesilinganiso2
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.
Amathuluzi adingekayo:
Ibhodwe lensimbi ethelwe
Isitofu samalahle
I-pyrometer
Amagilavu Esikhumba3
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.
Amathuluzi adingekayo:
Isigqulo NomgquloAmagilavu Esikhumba4
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.
Amathuluzi adingekayo:
Isisefo Esicolekile
Ijeke Lengilazi ElinesivaloIzinto
1- 300 gIsibambeli
Amathuluzi Adingekayo
9- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
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