Title of article
Acid leaching of CaOSiO2 resources
Author/Authors
Park، نويسنده , , Hyun Kyu and Bae، نويسنده , , Myung Won and Nam، نويسنده , , Ik Hyun and Kim، نويسنده , , Sun-Geon، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2013
Pages
7
From page
633
To page
639
Abstract
Waste resources containing CaO and SiO2 were leached by an acetic acid solution. Most CaO exist as calcium aluminosilicate and calcium silicate in steel slag and wollastonite, respectively. Silicate leaching was enhanced steeply by heating to 50 °C or increasing acid concentrations to 4 wt%. The Si and/or Al in the leachate then precipitated independently, depending on the solubility. This enabled to improve the selectivities of Ca and Si in the leachate and precipitate, respectively. However, CaO and SiO2 are separate constituents of waste cement. The dissolution of Ca thus took place relatively fast while the ‘free’ silica leached little.
Keywords
Calcium oxide: silica , Calcium silicate: leaching , Precipitation
Journal title
Journal of Industrial and Engineering Chemistry
Serial Year
2013
Journal title
Journal of Industrial and Engineering Chemistry
Record number
1710797
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