Thermal decomposition of zinc hydroxo-carbonate obtained after leaching of EAF dust
2003 (English)In: EPD Congress 2003: proceedings of sessions and symposia sponsored by the Extraction and Processing Division (EPD) of TMS (The Minerals, Metals & Materials Society) held during the 2003 TMS annual meeting in San Diego, California, March 2 - 6, 2003 / [ed] Mark E. Schlesinger, Warrendale, Pa.: Minerals, Metals & Materials Society, 2003, 365-376 p.Conference paper (Refereed)
An EAF dust generated in a Swedish steel mill has been leached in hydrochloric acid at pH = 3. The solution obtained has been subjected to purification by cementation followed by precipitation of zinc with sodium carbonate. The thermal decomposition of the precipitate was studied using thermal analysis and X-ray diffraction. The results show that during the calcination of the precipitate three different reactions occur. The decomposition of the solid phases Zn5(CO3)2(OH)6, CaZn(CO3)2 and CaCO3 occur completely at 370DGC, 560DGC and 940DGC respectively, yielding a final product containing 61.9% ZnO and 38.1% CaO. Methods to minimize calcium and manganese in the final product are discussed.
Place, publisher, year, edition, pages
Warrendale, Pa.: Minerals, Metals & Materials Society, 2003. 365-376 p.
Research subject Process Metallurgy
IdentifiersURN: urn:nbn:se:ltu:diva-39383Local ID: e1dec480-7002-11db-962b-000ea68e967bISBN: 873395328OAI: oai:DiVA.org:ltu-39383DiVA: diva2:1012894
TMS Annual Meeting : 02/03/2003 - 06/03/2003
Godkänd; 2003; 20061109 (ysko)2016-10-032016-10-03Bibliographically approved