Production of low sulfur content lime from limestone

Details Production of low sulfur content lime from limestone Production of low sulfur content lime from limestone

C - Chemistry, Metallurgy

04

B

C04B 2/10 (2006.01) C01F 11/46 (2006.01)

Patent

CA 2133624

A process for calcining limestone to lime to produce a low sulfur content lime product, while combusting a sulfur-containing carbonaceous fuel in a rotary kiln to provide heat for the calcination. A finely divided lime hydrate is added to the rotary kiln adjacent the combustion flame, such that the lime hydrate particles react with sulfur-containing contaminants in the hot combustion gases to form lime hydrate-sulfur reaction products, such as calcium sulfate, which are retained in the gaseous flow and removed from the rotary kiln.

rocédé de calcination de la pierre calcaire en chaux, par lequel on obtient un produit de chaux à faible teneur en soufre tout en brûlant dans un four tournant un combustible carboné soufré afin de produire la chaleur nécessaire à la calcination. Un hydrate de calcium finement divisé est ajouté au four tournant à proximité de la flamme de combustion , de sorte que les particules d'hydrate de calcium réagissent avec les contaminants soufrés des gaz de combustion à haute température pour former des produits de réaction associant hydrate de calcium et soufre, tels que le sulfate de calcium, qui demeurent dans le flux gazeux et sont évacués du four tournant.

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