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高温材料处理:国际期刊
SJR: 0.137 SNIP: 0.341 CiteScore™: 0.43

ISSN 打印: 1093-3611
ISSN 在线: 1940-4360

高温材料处理:国际期刊

DOI: 10.1615/HighTempMatProc.v5.i2.50
18 pages

EVAPORATION SYNERGIES BETWEEN LEAD AND ZINC CONTAINED IN A FLY ASH MODEL IN ITS TREATMENT BY PTA

S. Bernard
Science des Procedes Ceramiques et de Traitements de Surface (SPCTS), CNRS UMR 6638, Faculte des Sciences de Limoges, 123, av. A. Thomas - 87060 Limoges Cedex, France
Pierre Fauchais
Laboratoire Sciences des Procedes Ceramiques et de Traitements de Surface UMR CNRS 6638 University of Limoges 123 avenue Albert Thomas, 87060 LIMOGES - France
J. Jarrige
Science des Procedes Ceramiques et de Traitements de Surface (SPCTS), CNRS UMR 6638, Faculte des Sciences de Limoges, 123, av. A. Thomas - 87060 Limoges Cedex, France
J. P. Lecompte
Science des Procedes Ceramiques et de Traitements de Surface (SPCTS), CNRS UMR 6638, Faculte des Sciences de Limoges, 123, av. A. Thomas - 87060 Limoges Cedex, France

ABSTRACT

This study is about the evaporation synergies in the treatment of a fly ash model by a plasma transferred arc (stabilized by an argon flow). The fly ash model, composed of a zeolite matrix impregnated with lead and zinc salts, was treated in batch at room pressure under an argon atmosphere in a laboratory size plasma reactor.
The evaporation rates of lead and zinc were measured on-line by an ICP analysis system, for a fly ash model prepared with a zeolite matrix impregnated with lead and zinc chlorides and sulfates. It allowed to determine the influence of the applied arc power, the model composition and CaO addition on the evaporation rates. The presence of calcium or sodium oxide in the system reduced the melting bath temperature by nearly 200°C and allowed to devote a larger part of the available energy to the evaporation.
A thermodynamic study was made in order to understand the decomposition phenomena of the studied salts. By coupling these results to the enthalpy calculations and the evaporation rate measurements it was possible to suggest evaporation mechanisms.


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