METHOD FOR INDUSTRIAL MANUFACTURE OF PRECIPITATED CALCIUM CARBONATE (CaCO3) FROM CARBONATE BEARING ROCKS
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United States of America Patent
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Issued Date -
Apr 5, 2012
app pub date -
Mar 16, 2010
filing date -
Mar 17, 2009
priority date (Note) -
Abandoned
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Abstract
Method for industrial manufacture of pure (precipitated) CaCO3 comprising providing at least one naturally occurring carbonate bearing rock and comminuting said rock to increase its surface area. In a first reaction zone (R1) the comminuted carbonate bearing rock is contacted with water and CO2 at a pressure higher than standard pressure, at a temperature in the range 30-500° C. and at a pH lower than 5 to thereby dissolve the carbonate. Dissolved material is conveyed from the first reaction zone (R1) to a second reaction zone (R2) held at a lower pressure than the first reaction zone and a pH higher than that of the first reaction zone, the presence of H+ ions in first and second reaction zones being caused by the reaction between CO2 and water. In the second reaction zone the calcium carbonate is precipitated at a pH higher than 5.
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