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scorp1234
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Зарегистрирован: 03.12.2011
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 Добавлено: 8:35 24-01-2012 Заголовок сообщения: Гидрометаллургия |
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Добрый день! Переделываю задачу ууже третий раз. Препод возвращает. Вот мое решение:
12.19. Написать уравнения реакции получения металлического никеля из смеси оксидов NiO и гидрометаллургическим методом. В качестве растворителя оксидов использовать серную кислоту, а в качестве восстановителя – оксид углерода (II). Составить схему получения металлического никеля из смеси оксидов.
Дано:
NiO,
CO – восстановитель
Ni - ?
Решение:
Гидрометаллургия - технология, осуществляющая получение металлов из руд с помощью водных растворов специальных реагентов (кислот, щелочей, солей), которые переводят металлы из нерастворимого в руде состояния в водорастворимое. Далее металл из водных растворов выделяют либо восстановлением его более активным металлом, либо электролизом (если металл неактивный), либо экстракцией органическими соединениями.
NiO + CO = Ni +CO2 ????
Al2O3 +3CO =2Al +3CO2
Составим уравнения реакции никеля и алюминия в серной кислоте:
???
Электролиз NiSO4
K(-): Ni2+ +2ē =Ni0
2H20+ 2ē = H2 +2OH-
A(+): 2H2O-4ē = O2 +4H+
NiSO4 +2H2O = Ni + H2 + O2 + H2SO4
Электролиз Al2(SO4)3
K(-):
A(+):
2H2O=2 H2 +O2
Электролизу подвергается только вода.
Таким образом, алюминий остался в виде сульфата в растворе, а никель выделился на катоде.
Схема:
NiO Ni и (на катоде)
электролиз
(на аноде)
– в растворе |
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scorp1234
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