METHOD FOR INDUSTRIAL MANUFACTURE OF PRECIPITATED CALCIUM CARBONATE (CaCO3) FROM CARBONATE BEARING ROCKS
摘要
<p>Method for industrial manufacture of pure (precipitated) CaCO3 comprising providing at leas tone 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.</p>
申请公布号
WO2010107320(A1)
申请公布日期
2010.09.23
申请号
WO2010NO00098
申请日期
2010.03.16
申请人
INSTITUTT FOR ENERGITEKNIKK;MUNZ, INGRID, ANNE;RAAHEIM, ARNE;JOHANSEN, HARALD;KIHLE, JAN;BRANDVOLL, OEYVIND;KORNELIUSSEN, ARE
发明人
MUNZ, INGRID, ANNE;RAAHEIM, ARNE;JOHANSEN, HARALD;KIHLE, JAN;BRANDVOLL, OEYVIND;KORNELIUSSEN, ARE