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Large Volume Inorganic Chemicals - Ammonia ... - ammk-rks.net

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Chapter 44.4.23 Removal of Hg from process gasesDescriptionAcids produced in smelting processes or from recycling plants may contain mercury. Most ofthe mercury passes into the sulphuric acid plant with the process gas which contains SO 2 and, ifit is not washed out through the washing and cooling plant, it will end up in the sulphuric acidproduct. Besides removal of mercury from the product acid (see Table 4.6), mercury can beremoved from process gases. Table 4.23 gives an overview.MethodBoliden-Norzink method(Kalomel)Outokumpu methodDOWA methodSodium thiocyanatemethodSpecial conditionsGas scrubbing with a solution containing Hg 2+with formation of Hg 2 Cl 2

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