Publication: Magyar Közlöny
Issue: MK-2007-40 (Year: 2007, Number: 40)
Era: 2004-2010
Section: 
Paragraph Index: 294

45. To recover zinc from oxidized residues these are processed in an IS furnace. Very low-grade residues and flue dust (e.g. from the steel industry) are first treated in rotary furnaces (Waelz-furnaces) in which a high-content zinc oxide is manufactured. Metallic materials are recycled through melting in either induction furnaces or furnaces with direct or indirect heating by natural gas or liquid fuels or in vertical New Jersey retorts, in which a large variety of oxidic and metallic secondary material can be recycled. Zinc can also be recovered from lead furnace slags by a slag fuming process. Table 7 (a): Emission sources, control measures, dust reduction efficiencies and costs for the primary non-ferrous metal industry Emis si on so ur ce Cont rol me a su re(s) Dust re duc ti on ef fi ci en cy (%) Aba te ment costs (to tal costs US$) Fu gi ti ve emis si ons Suc ti on ho ods, enc lo su re, etc. off-gas cle a ning by FF >99 .. Ro as ting/ sin te ring Upd ra ught sin te ring: ESP + scrub bers (pri or to do ub le con tact sulp hu ric acid plant) + FF for tail ga ses .. 7–10/Mg H2SO4 Con ven ti o nal smel ting (blast fur na ce re duc ti on) Shaft fur na ce: clo sed top/ef fi ci ent eva cu a ti on of tap ho les + FF, co ve red la un ders, do ub le bell fur na ce top .. .. 2007/40. szám Emis si on so ur ce Cont rol me a su re(s) Dust re duc ti on ef fi ci en cy (%) Aba te ment costs (to tal costs US$) Im pe ri al smel ting High-ef fi ci en cy scrub bing >95 .. Ven tu ri scrub bers .. .. Do ub le bell fur na ce top .. 4/Mg me tal pro du ced Pres su re le a ching App li ca ti on de pends on le a ching cha rac te ris tics of con cent ra tes >99 si te-spe ci fic Di rect smel ting re duc ti on pro ces ses Flash smel ting, e.g. kiv cet, Ou to kum pu and Mit su bis hi pro cess .. .. Bath smel ting, e.g. top blown ro ta ry con ver ter, Aus melt, Isas melt, QSL and No ran da pro ces ses Aus melt: Pb 77, Cd 97; QSL: Pb 92, Cd 93 QSL: ope rat ing costs 60/Mg Pb Table 7 (b): Emission sources, control measures, dust reduction efficiencies and costs for the secondary non-ferrous metal industry Emis si on so ur ce Cont rol me a su re(s) Dust re duc ti on ef fi ci en cy (%) Aba te ment costs (to tal costs, US$) Lead pro duc ti on Short ro ta ry fur na ce: suc ti on ho ods for tap ho les + FF; tube con den ser, oxy-fu el bur ner 99.9 45/Mg Pb Zinc pro duc ti on Im pe ri al smel ting >95 14/Mg Zn

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