Method and apparatus for reducing the carbon content of combustion ash and related products

A method for reducing the carbon content of a combustion ash containing siliceous ash particles and carbon particles comprising:

• subjecting said combustion ash to comminution to reduce the particle size of said siliceous ash particles and said carbon particles;
• separating a portion of said carbon particles from said combustion ash by subjecting the comminuted combustion ash to a flow of gas which separates said portion of said carbon particles from said siliceous ash particles to obtain said combustion ash with reduced carbon content;
• and
• separating uncomminuted carbon particles from said combustion ash prior to said comminution of said combustion ash.

A method for reducing the carbon content of a combustion ash containing siliceous ash particles and carbon particles comprising:

• subjecting said combustion ash to comminution to reduce the particle size of said siliceous ash particles and said carbon particles;
• separating a portion of said carbon particles from said combustion ash by subjecting the comminuted combustion ash to a flow of gas which separates said portion of said carbon particles from said siliceous ash particles to obtain said combustion ash with reduced carbon content;
• and
• said gas is heated.

A method of creating a concrete mix comprising:

• subjecting a combustion ash containing siliceous ash particles and carbon particles to comminution to reduce the particle size of the siliceous ash particles and said carbon particles;
• separating a portion of said carbon particles from the combustion ash by subjecting the comminuted combustion ash to a flow of gas which separates said portion of carbon particles from the siliceous ash particles to obtain said combustion ash with reduced carbon content;
• admixing said combustion ash with reduced carbon content with an aggregate material and cement to create the concrete mix;
• and
• effecting said comminution of said combustion ash by autogenous grinding.