Utilization of dry scrubber waste materials

DETAILED DESCRIPTION I claim: 1.
A process for preparing a cured compacted product from dry flue gas scrubbing waste materials, said process comprising the steps of: (a) providing a substantially dry fly ash-containing powder obtained from the dry scrubbing of fly ash-containing flue gas with lime, said fly ash-containing powder comprising fly ash in intimate admixture with microparticulate crystallites of scrubber reaction materials selected from the group consisting of calcium sulfite, calcium sulfate, hydrates of calcium sulfite and calcium sulfate, calcium oxide, calcium hydroxide and mixtures thereof; (b) contacting said fly ash-containing powder with a predetermined amount of water to produce a powder/water mixture; (c) mixing said powder/water mixture in a manner and for a time sufficient to produce a uniform distribution of said water without the formation of large agglomerates or a sticky plastic mass; (d) placing said mixture in the desired configuration at the utilization site; (e) compacting the placed mixture within a predetermined time subsequent to the contacting step to a density of at least about 70% of the laboratory dry density of said mixture; and (f) curing the compacted material in place to form said cured compacted product.
2.
The process of claim 1 wherein said cured compacted product is a landfill material.
3.
The process of claim 1 wherein said cured compacted product is a structural landfill material.
4.
The process of claim 1 wherein said cured compacted product is utilized in a roadbase composition.
5.
The process of claim 1 wherein said powder/water mixture is transported to said utilization site after said mixing step.
6.
The process of claim 1 wherein said water contacting and said mixing steps are performed at said utilization site.
7.
The process of claim 1 wherein said predetermined amount of water is from about 60% to about 125% of the water amount which produces maximum compacted dry density.
8.
The process of claim 1 wherein said predetermined amount of water is from about 90% to about 120% of the water amount which produces maximum compacted dry density