SANAA
UREMBO NA USTAWI
UJANJA
UTAMADUNI NA HISTORIA
BURUDANI
MAZINGIRA
CHAKULA NA VINYWAJI
UHANDISI WA KINYUME
SAYANSI
MICHEZO
TEKNOLOJIA
VAZI
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.
Mwanzo
Half a day
Maagizo
1
1
Cut the zinc small
Cut the zinc small
Saw 300 g of zinc into small pieces.
Vifaa kwa hatua hii:
Mche wa Zinki300 gZana zinazohitajika:
Msumeno wa chuma
Mizani ya mizani-mbili2
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.
Zana zinazohitajika:
Chungu cha chuma cha kutupwa
Jiko la mkaa
Kipima joto kali
Glavu za Ngozi3
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.
Zana zinazohitajika:
Kinu na mchiGlavu za Ngozi4
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.
Zana zinazohitajika:
Ungo Mwembamba
Mitungi ya kioo yenye vifunikoVifaa
1- 300 gKishikilia Nafasi
Zana Zinazohitajika
9- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
Mchoro huu unatengeneza
CC0 Umma Wote
Mchoro huu umetolewa chini ya CC0. Uko huru kunakili, kubadilisha, kusambaza, na kutumia kazi hii kwa madhumuni yoyote, bila kuomba ruhusa.
Saidia Mtengenezaji kwa kununua bidhaa kupitia Mchoro wao ambapo wanapata Kamisheni ya Mtengenezaji iliyowekwa na Wachuuzi, au unda marudio mapya ya Mchoro huu na uiunganishe kama kiungo katika Mchoro wako kuchangia mapato.