Carbon removal through partial carbon burn-out from coal ash used in concrete

A process for producing a coal ash product having a low adsorption affinity for air entraining agents in concrete from a feed coal ash;

• comprising a partial combustion of a carbon residue of the feed coal ash wherein a fine carbon fraction of said carbon residue that is responsible for adsorption of air entraining agents in concrete is combusted, while leaving a non-combusted carbon fraction of a non-air entrainment agent absorbing carbon in the coal ash product;
• a recovery of the coal ash product;
• wherein the feed coal ash also contains sulfur, the sulfur in the coal ash product is reduced by as much as 60% weight.

A process for producing a coal ash product having a low adsorption affinity for air entraining agents in concrete from a feed coal ash;

• comprising a partial combustion of a carbon residue of the feed coal ash wherein a fine carbon fraction of said carbon residue that is responsible for adsorption of air entraining agents in concrete is combusted, while leaving a non-combusted carbon fraction of a non-air entrainment agent absorbing carbon in the coal ash product;
• a recovery of the coal ash product;
• wherein the feed coal ash also contains ammonia, and ammonia in the coal ash product is reduced by as much as 80% weight.

A method for reducing the adsorption characteristics of a coal ash bearing a carbon residue, said coal ash obtained from the combustion of coal;

• comprising combusting an adsorbing fraction of said carbon residue responsible for adsorption of air entraining agents in concrete, while leaving non-adsorbing carbon of said carbon residue un-combusted with said coal ash;
• wherein the fine carbon fraction makes up less than 15% by weight of the carbon residue, while being responsible for as much as 75% of the adsorption of the air entraining agents in concrete.