Laboratory Testing & General Mineral Processing Engineering

Laboratory Testing & General Mineral Processing Engineering 2017-03-23T09:50:31+00:00
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Removal of calcite sand from silica sand (1 reply)

Erling Young
2 weeks ago
Erling Young 2 weeks ago

I am evaluating a silica sand for potential as frac sand. It contains 1-3% calcite. The calcite has a crush strength much lower than the silica and is therefore not desired. The sand size range is 0.1 mm to 1.00 mm. The calcite is uniformly distributed, size wise, in the silica. What are the best ways to remove the calcite on a large scale without impacting the silica?

JP Garnier
2 weeks ago
JP Garnier 2 weeks ago
1 like by David

Hello,

As a chemist, if at all practical, based on the low calcite % I would leach out the calcite by a dilute solution of hydrochloric acid, the advantages are that it can be made in bulk, in heap leaching etc..

There might be some physical methods, flotation would be tricky as it is usually the other minerals that are floated away from calcite and the low % here would play against such a scheme unless there is a specific collector for calcite selective against silica.

Regards

JP

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