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Extraction of Metals with Low Reactivity

The Process of Roasting and Reduction

Introduction

  • Metals with low reactivity can be extracted from their ores.
  • Copper and mercury are examples of metals with low reactivity.
  • Copper exists in the form of copper glance (copper one sulphide).
  • Mercury exists in the form of s (mercury sulphide).

Extraction of Mercury

  • Mercury sulphide can be heated in the presence of oxygen.
  • It converts to mercury oxide, releasing sulfur dioxide gases.
  • Mercury oxide is further heated in the absence of oxygen, forming mercury and releasing oxygen.
  • The process of converting a sulphide ore to an oxide is called roasting.
  • The second process, removing oxygen from mercury oxide, is reduction.

Extraction of Copper

  • Copper glance (copper one sulphide) is heated in the presence of oxygen.
  • It converts to copper one oxide, releasing sulfur dioxide.
  • Not all the copper one sulphide is converted.
  • Copper one oxide is further heated in the absence of oxygen, reacting with the remaining copper one sulphide to form copper and sulfur dioxide.
  • The process of converting copper glance to copper one oxide is called roasting.

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