. It takes 15 kWh (kilowatt-hours) of electrical energy to produce 1.0 kg of aluminum metal fro

step 1 That's just to calculate the amount of energy that is associated with the production of one kilo

. It takes 15 kWh (kilowatt-hours) of electrical energy to...

. It takes $15 \mathrm{kWh}$ (kilowatt-hours) of electrical energy to produce $1.0 \mathrm{~kg}$ of aluminum metal from aluminum oxide by the Hall-Heroult process. Compare this to the amount of energy necessary to melt $1.0 \mathrm{~kg}$ of aluminum metal. Why is it economically feasible to recycle aluminum cans? (The enthalpy of fusion for aluminum metal is $10.7 \mathrm{~kJ} / \mathrm{mol}[1$ watt $=1 \mathrm{~J} / \mathrm{s}] .$ )

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Key Concepts

Hall-Heroult Process

The Hall-Heroult process is the primary method for extracting aluminum from its oxide ore, involving electrolytic reduction. It is one of the most energy?intensive metallurgical processes, requiring large amounts of electrical energy to break the strong bonds in aluminum oxide. Understanding this process is crucial when comparing the energy costs of producing primary aluminum versus recycling aluminum.

Enthalpy of Fusion

The enthalpy of fusion refers to the amount of energy required to change a substance from a solid to a liquid at its melting point without changing its temperature. For aluminum, this value helps quantify the energy needed to melt a given mass of solid metal. This concept is important in assessing the energy required for melting recycled aluminum compared to the energy needed for primary production.

Energy Efficiency and Recycling

Energy efficiency in the context of recycling aluminum becomes evident when comparing the relatively low energy required to melt aluminum metal with the much higher energy consumed in the Hall-Heroult process. Recycling aluminum is economically feasible primarily because the energy savings—melting used aluminum versus producing new aluminum from ore—are substantial, reducing cost and environmental impact.

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