| http://www.w3.org/ns/prov#value | - A process according to claim 1, wherein the flue gas substantially free of excessive impurities has a concentration of SO2 less than 300 vppm, SO3 less than 20 vppm, HCl less than 100 vppm, HF less than 20 vppm, and solids such as soot and dust less than 50 vppm.
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