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- Title
Laboratory and Field Evaluation of Solubility Control of Aluminium During Al-Bearing Acid Rock Discharge Treatment.
- Authors
Xunchi Pu; Ran Li; Kefeng Li; Ruifeng Liang
- Abstract
Potential control of soluble aluminium in Al-bearing acidic discharge neutralization by formation of precipitates other than Al(OH)3 was studied. At pH around 5.5, precipitates formed in field and laboratory showed that Al-solids contained sulfate and silicon. Although the soluble aluminium concentration do not match each of the solubility of species of Al-precipitates, the reason that soluble aluminium concentrations were less than solubility of amorphous Al(OH)3 was due to the formation of Al-sulfate. The laboratory experiments of synthetic ARD showed that basaluminite was formed and this was the reason that soluble Al concentration became less than the solubility of amorphous Al(OH)3. The change of sulphur contents in the sludge with pH revealed that more Al-sulfate (basaluminite) was formed at high pH (~8.3). The atomic ratio of Al/OH at different pH values suggested that the sludge formed at neutral pH conditions contained the most proportion of Al(OH)3. The formation of these precipitates provides a possible mechanistic explanation for the decrease of soluble Al concentration in neutralization of ARD.
- Subjects
ALUMINUM; FELSIC rocks; BEARINGS (Machinery); METEOROLOGICAL precipitation; AMORPHOUS substances; CHEMICAL species
- Publication
Nature Environment & Pollution Technology, 2018, Vol 17, Issue 3, p747
- ISSN
0972-6268
- Publication type
Article