Где находится золото и как его добывают

Золото в самородном состоянии встречается в кварцевых породах, в виде нитей, крапинок и фольг, часто в смеси с минералами серебра.
Или его также можно найти в руслах рек, вперемешку с песком, в виде зерен и самородков.
Добыча золота
Извлечение золота можно осуществлять с помощью трех различных процессов: сглаживания , амальгамации и цианирования . Однако не всегда необходимо использовать все три процесса.
Разглаживание происходит с использованием длинных контейнеров, которые позволяют отделить золото, пропуская медленный поток воды. Фактически, отходы, легче золота, уносятся вместе с водой, а мелкие кусочки золота опускаются на дно контейнера.
При амальгамации сырье измельчается в порошок, который затем амальгамируется ртутью. Впоследствии драгоценный металл восстанавливают путем перегонки амальгамы.
Цианирование является наиболее важным процессом экстракции. Золотые руды обрабатывают раствором цианида калия, в присутствии воздуха золото плавится и превращается в цианид ауро-калия. Выделение золота из этого раствора происходит с помощью цинка и электролитически.
Свойства золота
Золото в самородном состоянии имеет красновато-желтый цвет, блестящее, неизменяемое и ковкое (самый ковкий из металлов). По этой последней причине и для того, чтобы его можно было обрабатывать, его легируют другими металлами. Никакая обычная кислота на него не влияет, кроме царской водки, хлорной воды и щелочных цианидов. Его температура плавления 1063°, температура кипения 2600°.
Крупнейшими производителями золота являются Южная Африка, Китай, США и Австралия.
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