University of California

Zongsu Wei

Gaurav N Sant

Bu Wang

Dante A Simonetti

Erika Callagon La Plante

Laurent G Pilon

Erika Blanca Callagon La Plante

Sara Vallejo Castaño

Divalent ions are extracted from solids by leaching to form a divalent ion-containing solution. The divalent ion-containing solution is subjected to concentration to form a concentrated divalent ion-containing solution. Precipitation of a divalent ion hydroxide salt is induced from the concentrated divalent ion-containing solution. In other cases, the concentrated divalent ion-containing solution is exposed to carbon dioxide to induce precipitation of a divalent ion carbonate salt.

Facile, low-energy routes for the production of hydrated calcium and magnesium salts from alkaline industrial wastes

A method includes: (1) using a chelating agent, extracting divalent ions from a brine solution as complexes of the chelating agent and the divalent ions; (2) using a weak acid, regenerating the chelating agent and producing a divalent ion salt solution; and (3) introducing carbon dioxide to the divalent ion salt solution to induce precipitation of the divalent ions as a carbonate salt. Another method includes: (1) combining water with carbon dioxide to produce a carbon dioxide solution; (2) introducing an ion exchanger to the carbon dioxide solution to induce exchange of alkali metal cations included in the ion exchanger with protons included in the carbon dioxide solution and to produce a bicarbonate salt solution of the alkali metal cations; and (3) introducing a brine solution to the bicarbonate salt solution to induce precipitation of divalent ions from the brine solution as a carbonate salt.

Buffer-free process cycle for COsequestration and carbonate production from brine waste streams with high salinity

Buffer-free process cycle for CO2 sequestration and carbonate production from brine waste streams with high salinity

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Oakland, CA, United States of America

Zongsu Wei