Extraction of selenium from gold bearing
stone
Some gold ores contain selenium, such as copper, silver, lead, nickel,
and gold. Studies by Ian Praksyn, Ann Suvarovsky and Av Astafieva have
shown that the presence of selenium makes it difficult to extract gold
from ore - cyanide, because it also dissolves, and in the subsequent
process, the zinc dust is surrounded by zinc, reducing gold production.
The authors have developed a process to extract selenium from ore before
it is cyanated. To this end, crushed stone was treated by induction or
injection with a chlorinated lime solution Ca(OCl)Cl. When selenium is
oxidized to selenic acid, for example, by an approximate simplified
reaction:
Now 3cl + splashing over 2H2O = H2SeO3 + 3ccl2 + Me(OH2).
When selenium is decomposed into a solution, the selenium is extracted
into the solution by releasing the selenium solution into the carbon
dioxide in the solution or into the cement in the metal.
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Selenium is extracted from dust by sulphate