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| Influence of Alumina Concentration in Clinker Leaching Process |
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Received:December 11, 2015
Revised:December 23, 2015
Accepted:December 24, 2015
Published Online:May 19, 2016
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| DOI：doi：10.3969/j.issn.1007-7545.2016.06.011 |
| KeyWord:sodium aluminate solution; secondary reaction; calcium silicate; hydrogarnet; sodium-silicon residue |
| Author | Institution |
| HONG Jing–Nan |
大唐国际高铝煤炭资源开发利用研发中心 |
| SUN Jin-Min |
大唐国际高铝煤炭资源开发利用研发中心 |
| CHEN Jie |
大唐国际高铝煤炭资源开发利用研发中心 |
| ZHANG Yong-Zhen |
大唐国际高铝煤炭资源开发利用研发中心 |
| YANG Hui-Bin |
大唐国际高铝煤炭资源开发利用研发中心 |
| HU Jian |
大唐国际高铝煤炭资源开发利用研发中心 |
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| Abstract: |
| Desilication fly ash clinker was digested to obtain different concentration of sodium aluminate solution by controlling ratio of liquid to solid. Secondary reaction during clinker digestion process was analyzed by analyzing solution composition and solid phase composition in crude sodium aluminate solution under different leaching time. The results show that with increase of aluminate concentration and prolongation of leaching time, concentrations of alumina and silicon in aluminate solution decrease, contents of Al2O3 and Na2O in calcium silicate slag rise, and dissolution rates of Al2O3 and Na2O drop gradually. For calcium silicate content higher than 50% in desilication fly ash clinker, it is suggested that concentration of sodium aluminate solution be controlled at 100~120 g/L, and separation time of liquid and solid be controlled within 180 min. Reaction products and reaction process change with initial aluminate concentration with prolongation of leaching time under different initial aluminate concentration. Main products of dissolved solid phase include hydrogarnet, sodium-silicon residue, calcium silicate and a trace amount of calcite. |
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