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In the name of Allah,

the most beneficent,

the most merciful.

Electrolysis of CaCl 2

 Out of the above mentioned methods, electrolysis of molten CaCl 2 is the most extensively used method.

 In the past a mixture of CaCl 2 & CaF 2 was used.

 CaCl 2 & CaF 2 are in a ratio of 6:

 The operating temperature is 780-850°C

Disadvantages of using CaCl 2 & CaF 2

as an electrolyte

 High melting point of electrolyte

 Calcium metal may melt and become soluble with electrolyte

 High voltage is required. i.e. 20V

 Low power efficiency. i.e. 20 kW required for production of 1 lb of calcium

Use of CaCl 2 + BaCl 2 as Electrolyte

 The patent is about a novel electrolyte consisting of a mixture of calcium chloride & barium chloride.

 Operating temperature is 600-650°C.

 Following table gives different compositions of electrolyte & the melting point.

Use of CaCl 2 + BaCl 2 as Electrolyte

 A mixture of 100 parts of calcium chloride, 100 parts barium chloride & 20 parts potassium chloride was electrolyzed & it produced calcium deposit 96.9 % purity.

 The operating conditions were as follows.

Advantages of using CaCl 2 + BaCl 2

as Electrolyte

 Reduced bath temperature

 Convenient recovery of calcium metal

 Longer cell life

 Low voltage required. i.e. 3.5V

 High power efficiency. i.e. 4kW required for 1 lb calcium metal production