process for making a sorbent suitable for use in a dry circulation purifying device, premix for a process, sorbent suitable for use in a dry circulation purifying device, use of a sorbent, gas treatment process combustion and use of a premix

摘要

the present invention relates to a process for making a sorbent suitable for use in a dry circulation purifying device comprising the steps of: providing quicklime and water in a hydrator; erase said quicklime by means of a non-wet route in the hydrator; collect a lime-based sorbent at a hydrator outlet. the process is characterized by the fact that it comprises an additional step of adding at least one first additive comprising: a compound comprising silicon, and / or, a compound comprising aluminum, and / or a compound comprising silicon and aluminum before or during said erasure step, in a molar ratio between silicon or aluminum or a combination thereof and the calcium supplied to said hydrator equal to or less than 0.2 and equal to or greater than 0.02. in some other respects, the present invention relates to a sorbent, a premix and a flue gas treatment process.