Alumina and Aluminium Production Processes

<p>Aluminium metal and F- ions (D)</p> Signup and view all the answers

<p>30,000 kWh (D)</p> Signup and view all the answers

<p>γ -alumina (C)</p> Signup and view all the answers

<p>It allows for electrolytic dissolution of alumina. (B)</p> Signup and view all the answers

<p>China (C)</p> Signup and view all the answers

<p>80–90% cryolite and 2–8% alumina (D)</p> Signup and view all the answers

<p>To prevent fumes from escaping into the atmosphere. (A)</p> Signup and view all the answers

<p>950°C (A)</p> Signup and view all the answers

<p>$250 per tonne (D)</p> Signup and view all the answers

<p>They are consumed and require regular replacement. (A)</p> Signup and view all the answers

A unit of aluminum production, typically consisting of 150-300 cells connected in series.

The process of using electricity to break down a compound into its elements, in this case, extracting aluminum from its ore.

The negatively charged electrode in an electrolytic cell, where aluminum is deposited.

The positively charged electrode in an electrolytic cell, where oxygen is released as a byproduct.

The chemical reaction where aluminum oxide is transformed into aluminum metal and carbon dioxide. This reaction occurs in the electrolytic cell during aluminum production.

The process of extracting aluminum from bauxite ore. This involves dissolving the ore in a sodium hydroxide solution, separating impurities, and then precipitating aluminum hydroxide. This hydroxide is then calcined into alumina (aluminum oxide).

A type of aluminum oxide that is chemically active and is produced during the calcination of aluminum hydroxide in the Bayer process.

A type of aluminum oxide that is relatively inert and is produced by further heating of gamma alumina to higher temperatures.

The process of producing aluminum by electrolysis of alumina dissolved in molten cryolite. This process involves passing an electric current through the molten electrolyte, causing aluminum ions to be reduced at the cathode, resulting in molten aluminum.

A molten salt mixture primarily composed of sodium aluminum fluoride (Na3AlF6), used as the electrolyte in the Hall-Héroult process. It acts as a solvent for alumina and allows for its electrolysis.

The main component of the electrolyte in the Hall-Héroult process, which is a molten salt mixture composed of sodium aluminum fluoride (Na3AlF6).

An electrolytic cell used in the Hall-Héroult process to produce aluminum. It consists of carbon anodes, a molten electrolyte, a pool of liquid aluminum, a carbon-lined container, and a gas collection system.

Carbon materials used in the Hall-Héroult process as anodes, which are consumed during the electrolysis process due to oxidation reactions. They need to be replaced regularly.