Granted Patent B2

US 9,498,747 · App. 13/808,031 · Granted Nov 22, 2016

Inventors: Peter D'Amico (Newtown, CT); Thomas Lesniak (Clifton Park, NY); Christopher Poling (Bel Air, MD)

Assignee: Mercutek LLC

B01D53/14B01D53/64B01D53/78C04B7/364C04B7/436F27D17/008B01D2251/40B01D2258/0233

Abstract

Claims (11)

1. A method for treating cement kiln exhaust gas comprising:

providing a cement kiln exhaust gas stream from a kiln;

providing a reagent containing a water soluble alkaline-earth metal sulfide;

combining the cement kiln exhaust stream with the reagent to create a combined stream; and

removing particulates comprising at least a portion of one heavy metal from the combined stream by forming modified cement kiln dust containing the heavy metal in non-leachable form.

2. The method of claim 1 , further comprising combining the reagent with water prior to combining the cement kiln exhaust stream with the reagent.

3. The method of claim 2 , further comprising combining the reagent and water with at least one of a surfactant, a dispersant, and a hyperdispersant prior to combining the cement kiln exhaust stream with the reagent.

4. The method of claim 1 , wherein the providing the reagent further includes providing the reagent containing the water soluble alkaline-earth metal sulfide in water at a concentration of about 20% to about 40% of reagent to water.

5. The method of claim 2 , wherein the combining the reagent with the water further includes combining the reagent with the water in a ratio of about 1:3 to about 1:6 of reagent to water.

6. The method of claim 1 , wherein the removing comprises passing the combined stream through a particulate collection system, and wherein the method further comprises recycling the particulate for use as process addition to a finishing mill.

7. The method of claim 1 , wherein the alkaline-earth metal sulfide comprises an alkaline-earth metal polysulfide.

Assignments (13)

Continuity (3)