| 摘要 |
The invention relates to a process and to a device for eliminating the harmful volatile elements, in particular chlorides and/or sulfates, contained in a stream of particle-laden fumes, in which a given fraction of at least 5% of said fumes, referred to as "by-passed fumes', is extracted, the harmful elements of the by-passed fumes are caused to condense, at least with regard to their particles, according to a distribution that is a function of said fraction extracted, and said particles are filtered to isolate said harmful elements. According to the invention, at the time of filtering, said particles are separated into at least two fractions, one with a fine grain size and the other with a coarse grain size, using a separation selectivity adapted to said distribution of the elements in order for said coarse grain size faction to be poor in harmful elements and for said fine grain size fraction to be rich in harmful elements. Application to the production of cement clinker, in particular Portland cement clinker.
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