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In the extraction of copper from its sulphide ore, the addition of silica in the reverberatory furnace is primarily aimed at:
Removing as
Removing calcium as
Decreasing the temperature needed for roasting of
Separating as
Answers (1)
In the extraction of copper from its sulphide ore, the addition of silica in the reverberatory furnace is primarily aimed at removing as
.
The process of extracting copper from its sulphide ore, typically copper pyrites , involves several steps. One of the important steps is roasting, which is carried out in a reverberatory furnace. In this furnace, the sulphide ore is heated in the presence of air to convert the sulphide into oxide form.
During roasting, the following reaction takes place:
In this reaction, copper sulphide is formed along with iron oxide
and sulphur dioxide
. However, it is desirable to remove the iron oxide
from the roasted ore because it can interfere with the subsequent steps of copper extraction.
Silica is added to the furnace as a flux. A flux is a substance that helps in the removal of impurities during the metallurgical process. Silica reacts with the iron oxide to form
, which is a slag. The slag is lighter and floats on the surface of the molten copper matte, allowing easy separation.
The reaction between silica and iron oxide can be represented as follows:
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