Acid leaching of CaO-SiO2 resources

Hyun Kyu Park; Myung Won Bae; Ik Hyun Nam

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Acid leaching of CaO-SiO2 resources

机译：CaO-SiO2资源的酸浸

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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.

机译：含有CaO和SiO2的废物资源通过乙酸溶液浸出。大多数CaO分别以铝硅酸钙和硅酸钙的形式存在于钢渣和硅灰石中。通过加热到50°C或将酸浓度增加到4 wt％，硅酸盐浸出得到了极大的增强。然后，取决于溶解度，浸出液中的Si和/或Al独立地沉淀。这使得能够分别提高渗滤液和沉淀物中Ca和Si的选择性。但是，CaO和SiO2是废水泥的单独成分。因此，钙的溶解相对较快，而“游离”二氧化硅的浸出很少。

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《Journal of industrial and engineering chemistry》 |2013年第2期|共7页
作者
Hyun Kyu Park; Myung Won Bae; Ik Hyun Nam;
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正文语种 eng
中图分类化学工业;
关键词
Calcium silicate: leaching; Calcium oxide: silica; Precipitation;

机译：硅酸钙：浸出;氧化钙：二氧化硅;沉淀;

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Acid leaching of CaO-SiO2 resources

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