Barite for heavy metal removal
AssigneeOmya International AG
InventorsTobias KELLER, Manuel EGGIMANN
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Abstract
The present invention relates to the use of particulate mineral material comprising barite for scavenging heavy metal anions from a liquid medium, wherein the heavy metal anions form water-insoluble barium salts with barium cations of the barite, and wherein the particulate mineral material has a specific surface area of from 0.1 m2/g to 100 m2/g, measured using nitrogen sorption and the BET method.
Claims21
A method of using a particulate mineral material comprising barite for scavenging heavy metal anions from a liquid medium comprising the steps of,
- providing a particulate mineral material comprising barite and
- providing a liquid medium,
- wherein heavy metal anions form water-insoluble barium salts with barium cations of the barite, and wherein the particulate mineral material has a specific surface area of from 0.1 m2/g to 100 m2/g, measured using nitrogen sorption and the BET method.
(canceled)
A building material composition comprising cement and a particulate mineral material comprising barite as scavenger for heavy metal anions, wherein the heavy metal anions form water-insoluble barium salts with barium cations of the barite, and wherein the particulate mineral material has a specific surface area of from 0.1 m2/g to 100 m2/g, measured using nitrogen sorption and the BET method.
A method of using a particulate mineral material comprising barite as a scavenger for heavy metal anions in a building material composition comprising cement comprising the steps of,
- mixing the particulate mineral material with a dry building material to form the building material composition;
- and
- adding a liquid medium to the building material composition;
- wherein the heavy metal anions form water-insoluble barium salts with barium cations of the barite, and wherein the particulate mineral material has a specific surface area of from 0.1 m2/g to 100 m2/g, measured using nitrogen sorption and the BET method.
Dependencies are inferred from the claim text.