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How is sodium chromate separated from the insoluble material in roasted chromium ore?
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chromium processing
Chromium.
In the process of extracting chromium, sodium chromate is separated from the insoluble gangue (the waste material) through a process called leaching.1
After the chromium ore is roasted with soda and lime, the resulting calcine contains the desired sodium chromate. This substance is then dissolved out of the insoluble material using the leaching process, allowing for its subsequent reduction and precipitation.1