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1

Dissolution kinetics of smithsonite in boric acid solutions

Abali Y., Bayca S. U., Gumus R.

Physicochemical Problems of Mineral Processing

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2017

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Vol. 53, iss. 1

161--172

EN

The dissolution of smithsonite in boric acid solutions was investigated. The influence of the reaction temperature, acid concentration, solid-to-liquid ratio, particle size and stirring speed on the zinc extraction were determined in the experiments. The results show that the dissolution rate increases with increasing acid concentration and reaction temperature, and with decreasing particle size and solid-to-liquid ratio. The dissolution results were analyzed by reaction control models. The activation energy of smithsonite in boric acid solution was also calculated.

2

Verification of assumption about mechanism of reaction of nitric oxide with oxygen

Wilk M., Głowiński J., Słonka T., Rój E.

Polish Journal of Chemical Technology

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2002

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Vol. 4, nr 3

40-45

EN

Some variations of nitric oxide oxidation have been analysed. Some available data of kinetic investigation results as well as quantitative criteria of the accepted assumptions were used. In order to reconcile the experimental kinetic equation and complex temperature relationship of the constant of the equation, some hypotheses of the concurrent reactions were verified using two independent ways. It has been proved that a multistage mechanism predominates at lower temperatures. Hypothetical constant reaction rates at quasi equilibrium state have been estimated using the discussed mechanism. Another mechanism of complex reaction or elementary reaction predominates at higher temperatures. Moreover, taking the assumption of the multistage mechanism and the stationary state approach in acceptable limits is the same as the acceptance of the elementary character of nitric oxide oxidation reaction at higher temperatures.

3

Verification of assumption about mechanism of reaction of nitric oxide with oxygen

Wilk M., Głowiński J., Słonka T., Rój E.

Polish Journal of Chemical Technology

|

2002

|

Vol. 4, nr 1

32-37

EN

Some variations of nitric oxide oxidation have been analysed. Some available data of kinetic investigation results as well as quantitative criteria of the accepted assumptions were used. In order to reconcile the experimental kinetic equation and complex temperature relationship of the constant of the equation, some hypotheses of the concurrent reactions were verified using two independent ways. It has been proved that a multistage mechanism predominates at lower temperatures. Hypothetical constant reaction rates at quasi equilibrium state have been estimated using the discussed mechanism. Another mechanism of complex reaction or elementary reaction predominates at higher temperatures. Moreover, taking the assumption of the multistage mechanism and the stationary state approach in acceptable limits is the same as the acceptance of the elementary character of nitric oxide oxidation reaction at higher temperatures.