К проблеме снижения объёмов вредных выбросов при аффинаже серебра: статья в сборнике статей

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Resumo

The work is devoted to the study of the possibilities of minimizing the release of nitrogen oxides during the dissolution of silver in nitric acid solutions during refining of the gold and silver alloy. Using a rotating disk, the maximum concentration of nitric acid is determined, at which the oxidation potential of the system is insufficient for the oxidation of silver. It has been established that at a temperature of 363 K and a concentration of HNO3 = 50 g/dm3, the dissolution rate of silver does not exceed 0,00022∙10-5 mol/(cm2 ∙ s) and such conditions can be considered as background for an environmentally friendly process. To initiate dissolution, hydrogen peroxide was used as an alternative oxidizing agent. As a criterion for the rational use of the oxidant and the ecological purity of the process, the excess pressure over the solution was evaluated. The influence of the initial and current composition of the solution, temperature, and conditions of oxidant supply to the reactor on the kinetics of the target process was studied. It is shown that at a silver dissolution rate of 2,7∙10-6 mol/(cm2 ∙ s), no release of nitrogen oxides was observed.
Título traduzido da contribuiçãoTo the Problem of Reducing the Amount of Harmful Emissions when Refining Silver
Idioma originalRussian
Título da publicação do anfitriãoАктуальные проблемы развития технических наук : сборник статей участников XXII Областного конкурса научно-исследовательских работ «Научный Олимп» по направлению «Технические науки»
Subtítulo da publicação do anfitriãoсборник статей
Local da publicaçãoЕкатеринбург
EditoraФедеральное государственное автономное образовательное учреждение высшего профессионального образования "Уральский федеральный университет им. первого Президента России Б.Н. Ельцина"
Páginas18-25
Número de páginas8
ISBN (impresso)978-5-91256-495-6
Estado da publicaçãoPublished - 2020

GRNTI

  • 81.09.00

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