Cement kiln exhaust gas pollution reduction

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A method for treating cement kiln exhaust is provided. The method includes the steps of : providing a cement kiln exhaust gas stream from a kiln; providing a water soluble alkaline-earth metal polysulfide; combining the cement kiln exhaust stream with the water soluble alkaline-earth metal polysulfide to create a combined stream; and removing at least a portion of one heavy metal from the combined stream.