Concentration of Ores

The video tutorial covers various methods of ore concentration, including gravity separation, magnetic separation, froth flotation, and leaching. Gravity separation uses the difference in specific gravity to separate denser ores from lighter gangue. Magnetic separation involves using a magnet to separate magnetic ores from non-magnetic materials. Froth flotation is used for sulfide ores, where collectors and froth stabilizers aid in separating hydrophobic mineral particles. Leaching involves converting metals into soluble salts, demonstrated with alumina extraction from bauxite and noble metals like gold and silver.

What is the primary principle behind gravity separation?

• Electrical conductivity

• Magnetic properties

• Specific gravity differences

• Chemical reactivity

Which type of ore is typically concentrated using magnetic separation?

• Oxide ores of tin

• Sulfide ores

• Magnetic oxides of iron

• Carbonate ores

In the froth flotation method, what is the role of collectors?

• To increase the density of the solution

• To increase hydrophobicity of mineral particles

• To stabilize the froth

• To dissolve the ore

How can different sulfide ores be separated in the froth flotation process?

• By using different magnets

• By altering the pH level

• By changing the temperature

• By adjusting the proportion of oil to water or using depressants

What is the main purpose of leaching in ore concentration?

• To convert metals into soluble salts

• To separate magnetic ores

• To increase the density of the ore

• To remove water from the ore

Which chemical is used in the leaching process of alumina from bauxite?

• Sulfuric acid

• Sodium hydroxide

• Ammonia

• Hydrochloric acid

In the leaching process for noble metals, what is the role of oxygen?

• To reduce the metal

• To dissolve the metal

• To precipitate the metal

• To oxidize the metal