Cement kiln dust treatment system and method

摘要

A method for treating cement kiln dust is provided. The method includes the steps of receiving cement kiln dust (CKD) from a kiln; heating the collected CKD; forming a gas stream of vaporized metal and CKD by sufficient heating to separate at least one heavy metal from the collected CKD stream to create a cleaned CKD stream and a metal stream; providing a water soluble alkaline-earth metal polysulfide; combining the heavy metal stream with the water soluble alkaline-earth metal sulfide to create a combined stream; and removing at least a portion of one heavy metal from the combined stream.

主权项

1. A method for treating cement kiln dust, comprising:
receiving cement kiln dust from a cement kiln; heating the cement kiln dust to separate at least one heavy metal from the cement kiln dust to create a heavy metal containing gas stream; treating the heavy metal gas stream with a treating fluid, wherein treating the gas stream with the treating fluid comprises treating the gas stream with a treating fluid containing at least one alkaline-earth metal polysulfide; and removing at least a portion of at least one heavy metal from the gas stream.