Gold Separation and Extraction Methods
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Questions and Answers

What is the main difference between haematite and magnetite?

  • Haematite is more easily reduced than magnetite (correct)
  • Magnetite is more abundant in nature than haematite
  • Haematite is more magnetic than magnetite
  • Magnetite contains more pure metal than haematite
  • What is the purpose of sintering the ore into lumps?

  • To prepare the ore for use in the blast furnace (correct)
  • To increase the iron content of the ore
  • To make the ore easier to transport
  • To remove impurities like silica and alumina
  • What is the role of limestone in the blast furnace?

  • It reacts with silica and alumina to form slag (correct)
  • It removes sulphur and phosphorus from the iron
  • It reduces the consumption of fuel
  • It increases the iron content of the ore
  • What is the purpose of ore dressing operations?

    <p>To remove impurities like silica and alumina</p> Signup and view all the answers

    How can sulphur and phosphorus be removed from the iron?

    <p>By removing the slag from the blast furnace</p> Signup and view all the answers

    What is the maximum allowable amount of sulphur and phosphorus in steel?

    <p>0.05% each</p> Signup and view all the answers

    What is the primary benefit of preheating in steel production?

    <p>Enhancing the economy of steel production</p> Signup and view all the answers

    What happens to the slag layer in the steel production process?

    <p>It floats over the heavier iron and is collected as waste</p> Signup and view all the answers

    Which reaction occurs during the production of cast iron?

    <p>2Fe + SiO2 → 2FeO + Si</p> Signup and view all the answers

    What is the primary source of aluminium for commercial extraction?

    <p>Bauxite ores</p> Signup and view all the answers

    Where does most of the sulphur end up during steel production?

    <p>Mixed with calcium to form CaS and MnS</p> Signup and view all the answers

    What is the function of preheating in steel production?

    <p>To increase the efficiency and reduce costs</p> Signup and view all the answers

    What is the primary purpose of the ore dressing stage in aluminum extraction?

    <p>To separate the aluminum-containing mineral from waste materials</p> Signup and view all the answers

    What is the chemical reaction that occurs during the chemical treatment of bauxite?

    <p>2NaOH + Al2O3 → Na2Al2O3 + H2O</p> Signup and view all the answers

    What is the primary component of bauxite?

    <p>One or more aluminum hydroxide minerals</p> Signup and view all the answers

    What is the role of cryolite in aluminum extraction?

    <p>It is used as a solvent for bauxite in the extraction process</p> Signup and view all the answers

    What happens when cryolite is immersed in water?

    <p>It becomes invisible but does not dissolve</p> Signup and view all the answers

    Which stage of aluminum extraction involves the electrolytic process?

    <p>Reduction of aluminum from aluminum oxide</p> Signup and view all the answers

    What is the primary purpose of the flotation process in gold extraction?

    <p>To separate gold particles from other materials</p> Signup and view all the answers

    In the cyanidation leaching process, what is the role of zinc dust?

    <p>To precipitate gold from the cyanide solution</p> Signup and view all the answers

    Why is deaeration of the gold cyanide solution necessary before adding zinc at cold temperatures?

    <p>To remove dissolved oxygen, which can interfere with the precipitation reaction</p> Signup and view all the answers

    Which of the following impurities can cause issues during cyanidation by consuming cyanide and oxygen unnecessarily?

    <p>Metal sulfides</p> Signup and view all the answers

    How is the effect of iron sulfides, which can form problematic iron cyanide complexes, reduced during cyanidation?

    <p>By adding lead nitrate</p> Signup and view all the answers

    What is the purpose of adding excess cyanide during the cyanidation process when copper is present?

    <p>To ensure sufficient cyanide is available for the dissolution of gold</p> Signup and view all the answers

    What is the primary purpose of the concentration step in copper extraction?

    <p>To separate the copper mineral from the gangue</p> Signup and view all the answers

    What is the purpose of the roasting step in copper extraction?

    <p>To remove excess sulfur from the ore</p> Signup and view all the answers

    Which of the following is true about the copper ore used in commercial extraction?

    <p>It contains between 1.5-5% copper</p> Signup and view all the answers

    Which step in the copper extraction process is used to convert copper sulfides to copper oxides?

    <p>Roasting</p> Signup and view all the answers

    What is the approximate copper content (in percentage) after the smelting and matte conversion step?

    <p>98%</p> Signup and view all the answers

    Which step in the copper extraction process is used to achieve a copper purity of 99.9%?

    <p>Electrolytic conversion</p> Signup and view all the answers

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