Vapor Pressure Measurement of Zinc Oxychloride

Son, Sang Han; Tsukihashi, Fumitaka

doi:10.2355/isijinternational.43.1356

Cited by 21 publications

(27 citation statements)

References 9 publications

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“…However, it is observed that the dissolution of oxide ion in the molten ZnCl 2 decreases the partial pressure of ZnCl 2 in the previous works. 7,8) Accordingly, it is difficult to attribute the increase of evaporation rate of ZnCl 2 to the partial oxidization of ZnCl 2 in the melt.…”

Section: Effect Of Oxygen Partial Pressurementioning

confidence: 99%

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Evaporation Kinetics of the Molten PbCl2-ZnCl2 System from 973 to 1073 K

Wang

Matsuura

et al. 2007

ISIJ Int.

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The clarification of chlorides evaporation behavior from chloride or oxychloride melts is quite important for the treatment and recycling of fly ash generated from incineration processes of municipal solid waste. In the present study, the evaporation rate of the molten PbCl 2 -ZnCl 2 binary chloride system was measured at 973, 1 023 and 1 073 K. The effects of temperature, composition of the melt and the oxygen partial pressure of atmosphere on the evaporation rate of molten chloride were investigated. The ZnCl 2 in chloride melt evaporated preferentially, but the evaporated amount of PbCl 2 was negligibly small. Calculated activation energy of ZnCl 2 evaporation was 194Ϯ4 kJ/mol and that evaporation rate was smaller than that estimated from ZnCl 2 activity for the PbCl 2 -ZnCl 2 system. Therefore, the evaporation is considered to be controlled by the slower chemical reaction step than the interfacial evaporation reaction. The evaporation rate increased with increasing oxygen partial pressure in the atmosphere, which might be due to the effect of oxychloride formation.

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Section: Effect Of Oxygen Partial Pressurementioning

confidence: 99%

“…Son and Tsukihashi [6][7][8] clarified the oxychloride formation of PbOCl and ZnOCl for lead and zinc from the vapor pressure measurement of these chlorides at oxidizing atmosphere. Matsuura et al [9][10][11][12] measured the chlorination and evaporation rates of these oxides at chlorinating and oxidizing atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Evaporation Kinetics of the Molten PbCl2-ZnCl2 System from 973 to 1073 K

Wang

Matsuura

et al. 2007

ISIJ Int.

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“…A slight increase of chlorination rate of ZnO is caused by the production of gaseous zinc oxychloride together with ZnCl 2 in oxidizing atmosphere. 21,24,25) On the contrary, chlorination rate of ZnFe 2 O 4 decreases due to the occupation of reaction sites by oxygen atom and the interference of the adsorption of chlorine atom as well as production of ZnCl 2 . Figure 16 shows the temperature dependence of chlorination rate constant obtained by eq.…”

Section: Reaction Mechanisms Of Znfe 2 O 4 Chlorinationmentioning

confidence: 99%

Chlorination Kinetics of ZnFe2O4 with Ar-Cl2-O2 Gas

2006

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Chlorination rate of ZnFe 2 O 4 with Ar-Cl 2 -O 2 gas was measured at 1023 to 1123 K by gravimetry. The effects of temperature, partial pressures of chlorine and oxygen on the rate were investigated. Zinc oxide contained in ZnFe 2 O 4 specimen was selectively chlorinated and evaporated in gas, while iron oxide remained as oxide in a chlorinated residue. Chlorination rate increased with increasing partial pressure of chlorine. On the other hand, chlorination rate slightly decreased with increasing partial pressure of oxygen and chlorination of iron oxide was prevented. Since the order of chlorination rate with respect to partial pressure of chlorine was approximately 0.5, the rate-determining step of chlorination is considered to be the dissociative adsorption of chlorine gas on the surface of solid ZnFe 2 O 4 . Decrease of chlorination rate with the increase of partial pressure of oxygen could be explained by the occupation of adsorption sites of chlorine atoms by oxygen and the chlorination rate was expressed as functions of partial pressures of chlorine and oxygen asO2 Þ The activation energy of chlorination was 35:1 AE 2:2 kJ/mol which is relatively small compared to that of ZnO chlorination reaction (58.2 kJ/mol). It is considered that this low activation energy is due to the weak adsorption of chlorine atom on the adsorption site.

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“…This dependence of chlorination rate of zinc on oxygen partial pressure might be due to the formation of gaseous zinc oxychloride such as ZnOCl (g) together with ZnCl 2 (g). 17,18) In the case of ZnO chlorination, ZnO chlorination rate slightly increased with increasing partial pressure of oxygen. 14) On the other hand, ZnFe 2 O 4 chlorination rate decreased with increasing oxygen partial pressure due to the interference of chlorination reaction by the occupation of reaction sites with oxygen.…”

Section: Effect Of Oxygen Partial Pressurementioning

confidence: 99%