Control of Total Reduced Sulphur Emission from a Fluid Bed Calciner

Abstract

An investigation of the total reduced sulphur (TRS) emissions from a fluid bed calciner has indicated that the only TRS component originating at this source was H₂S and this emission emanated from the mud drying system. The principal variable affecting the H₂S emission was the soluble sulphide in the lime mud feed to the cage mill.
Methods for controlling the sulphide concentration in lime mud have been evaluated. The filtration properties of lime mud were investigated with the objective of maximizing the soluble sulphide removal from the filter cake feed to the calciner. Techniques for oxidizing soluble sulphide in lime mud were also evaluated. The results of these tests demonstrated the technical and economic feasibility for aeration in sparged vessels and aeration with high pressure oxygen.