Calcination systems, calcination methods and method and system for calcination and causticization

The calcination system, comprising:

• an electrically heated first calcination chamber, configured to convert input material into first calcination process products comprising a solid compound and a gas in the form of carbon dioxide;
• a first separator configured to receive said first calcination process products from said electrically heated first calcination chamber and separate said solid compound from the carbon dioxide;
• a thermally insulated second calcination chamber configured to receive said solid compound, and convert it into second calcination process products comprising an oxide;
• and
• a second separator configured to receive said second calcination process products from the thermally insulated second calcination chamber and separate said oxide.

A calcination method, comprising:

• injecting input material, into a heated first calcination chamber;
• converting in the heated first calcination chamber, the input material into a first calcination process product comprising gas and a solid compound;
• transferring the first calcination process product to at least one thermally insulated, unheated, second calcination chamber;
• converting, in the at least one thermally insulated second calcination chamber, the first calcination process product into a second calcination process product comprising gas and a solid compound;
• transferring the second calcination process products to a separator;
• and
• separating, in the separator, the gas from the solid compound.