Melebur Dan Mengasingkan Logam.

lucid_lynx · Post time 8-9-2011 10:29 AM

Post Last Edit by lucid_lynx at 8-9-2011 12:02

Salam semua,

selamat hari raya diucapkan.

Nak tanya korang, bagaimana caranya kita org biasa nak leburkan sesuatu logam dan asingkan unsur yg ada didalamnya ? sebagai contoh, aku nak leburkan suasa dan asingkan unsur perak dan emas dari suasa tersebut. boleh ke ? atau kene buat kat lab jugak ?

Betulke ketumpatan sesuatu unsur tu berlainan ? kalau sekilo emas dengan sekilo perak lain lain ke isipadu dia ? sebab berdasarkan cerita bagaimana archimedes nak tau tukang emas raja tipu ke tak samaada dia campurkan emas tu dengan perak atau tidak so dia letak dalam air.

Aku tak berapa paham lagi sebenarnya konsep tumpat atau tak tumpat nih. ehehehe ~ sila beri pencerahan ye ahli fizik dan matematik sekalian.

terima kasey. ;) ;) ;)

dauswq · Post time 9-9-2011 12:03 AM

Reply 1# lucid_lynx

seingat aku ade kaedah pengasingan tertentu
yg menjadi masalah bile suasa tu dh jadi sebatian complex wlpn hanya bercampur ngan emas/perak

winamp05 · Post time 10-9-2011 02:24 AM

soalan yg menarik.

winamp05 · Post time 10-9-2011 02:24 AM

Reply 2# dauswq

memang ade cara ye cik dawus ? mesti agak susah tu kan.

dauswq · Post time 10-9-2011 12:00 PM

Reply 4# winamp05

tak dpt elaborate sbb tak de pengetahuan dlm bidang ni...
terutama mengenai kimia

chewan · Post time 10-9-2011 07:11 PM

Reply 1# lucid_lynx

The elements in ionic compounds can be separated by electrolysis.

Metals above carbon in the reactivity series(potassium, sodium, lithium, calcium, magnesium and aluminium)
are extracted by electrolysis.
Extraction from the metal ore involves reduction of the metal,
and electrons can reduce any metal ion.

metal ions + electrons metal atoms (reduction).
non-metal ions - electrons non-metal atoms (oxidation).

chewan · Post time 10-9-2011 07:15 PM

Kaedah metallugy lebih tepat rasa nya

Main process	Sub-process
1. Concentration of the ore (removal of unwanted metals and gangue to purify the ore).	a. Hydraulic washing. b. Gravity separation. c. Froth floatation. d. Magnetic separation. e. Chemical separation.
2. Conversion into metal oxide.	a. Calcination for carbonate ore. b. Roasting for sulphide ore.
3. Reduction of metal oxide to metal.	a. Roasting - mercury (Hg) is produced by roasting Cinnabar (HgS) in air. b. Reduction - using highly reactive elements. Example: aluminium reduces manganese dioxide to manganese. c. Electrolytic reduction - highly reactive elements, such as sodium and mercury, are obtained by electrolytic reduction when the metal is deposited at cathode.
4. Refining of impure metal into pure metals.	[size=-1]a. Electrolytic refining - of copper, gold, tin, lead, chromium, nickel, etc. [size=-1]b. Liquation process - for tin, lead and bismuth. [size=-1]c. Distillation process - for zinc, mercury. [size=-1]d. Oxidation process - for iron.

IRZeeBuk · Post time 19-12-2011 02:14 PM

gune kaedah cupellation untuk asing Au and Silver dr other impurities
~gune temperature yg tinggi
Boleh google kalau nk tau kaedahnye camne...

Or gune electrowinning method kalau Au and Silver tuh lam bentuk ion..
~~Boleh google sndiri gak kalau nk tau kaedahnye camne