The document discusses two methods for recovering valuable metals from e-waste: hydrometallurgy and pyrometallurgy. Hydrometallurgy uses aqueous chemistry and room temperature liquids to leach, concentrate, and purify metals like silver, copper, and zinc from e-waste. Pyrometallurgy applies high temperatures through processes like calcination, roasting, smelting, and refining to extract metals like iron, copper, zinc, chromium, and manganese. While pyrometallurgy has higher recovery efficiency and accelerated reaction rates, it is also more energy intensive, capital intensive, and produces toxins.

1. Two Methods of Recovery of
Valuable Metals from E-waste:
1.Hydrometallurgy 2. Pyrometallurgy
Presented By:
Kazi Shafayat Ahmed
Roll: 1811046
Department of Materials and Metallurgical Engineering
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2. What is Hydrometallurgy?
The Word “Hydro” indicates “Water”.
This Process involves Aqueous Chemistry
for recovery of metals.
Room Temperature and Liquid Solvent is
used in this process.
 Ag, Cu and Zn are extracted by
hydrometallurgy.
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3. 3.Metal Recovery
Metals are recovered from solution to solid form
2.Concentration & Purification
Remove impurities to increase metal concentration
1.Leaching
Convert the valuable metals into soluble salts
Steps of Hydrometallurgy
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4. Disadvantages
1. Potential low energy input and high purity output
2. Controlled environment and good recovery
1. Highly corrosive solutions
2. Recovering the valuable metals
from dissolved iron is difficult
Advantages
Advantages and Disadvantages
of Hydrometallurgy
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5. What is Pyrometallurgy?
The Word “Pyro” indicates “Fire”.
This Process involves high temperature
where chemicals reactions takes place.
Heating and smelting operations are used in
this process to recover the valuable metals.
 Fe ,Cu ,Zn ,Cr, Mn are extracted by
pyrometallurgy.
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6. 1.Calcination
Heating below MP* in absence or limited supply of air
4. Refining
Removal of impurities from materials by a thermal process
3. Smelting
Reduced to metals by heating with carbon at high temperature
2. Roasting
Heating below MP* in presence of excess oxygen for oxidation
Steps of Pyrometallurgy 1811046
MP* = Melting Point

7. Advantages
1. High efficiency recovery
2.Reaction Rate is accelerated
at high temperature
1. Capital and high energy intensive
2. It produces toxins
3. Requires high amount of residual metals
Disadvantages
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Advantages and Disadvantages
of Pyrometallurgy

8. more predictable
more exact
more easily controlled
Comparison
Hydrometallurgical Method is
than Pyrometallurgical Method
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