Pyroprocessed aggregates comprising IBA and low calcium silicoaluminous materials and methods for producing such aggregates

A method for producing an aggregate, comprising:

• preparing a mixture comprising incinerator bottom ash (“IBA”) from a municipal solid waste incinerator and a second, non-coal ash silicoaluminous waste material;
• agglomerating the mixture to form an agglomerate;
• and
• pyroprocessing the agglomerate in a rotary kiln to form a lightweight aggregate having a dry relative density of less than 2 grams per cubic centimeter.

A method for producing an aggregate, comprising:

• mixing incinerator bottom ash (“IBA”) from a municipal solid waste incinerator and a second, non-coal ash silicoaluminous waste material;
• agglomerating the mixture to form an agglomerate;
• and
• pyroprocessing the agglomerate to a temperature to expand the agglomerate to form an aggregate having pores.

A method for producing a lightweight aggregate, comprising:

• mixing incinerator bottom ash (“IBA”) from a municipal solid waste incinerator with a second, non-coal ash silicoaluminous waste material having less calcium fluxing agents than the IBA;
• agglomerating the mixture in the presence of water to form an agglomerate;
• and
• pyroprocessing the agglomerate in a rotary kiln to a temperature between 1050° C. and 1240° C. to form a glassy crystalline porous lightweight aggregate having a dry relative density of less than 2 grams per cubic centimeter.