| http://www.w3.org/ns/prov#value | - The advantage of having a slag layer 19 in the first zone is that sulfur, chlorine or other halides which are contained in the carbonaceous feed or are contained in other streams feeding into either the first or second zones react with calcium oxide (CaO) and or magnesium, oxide (MgO) in the slag layer to form the corresponding sulfides or halides.
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