Uniform particles formed by hydrolysis of acid mine drainage with urea

0369860 - ÚACH 2012 RIV NL eng J - Journal Article
Šubrt, Jan - Michalková, E. - Boháček, Jaroslav - Lukáč, Jozef - Gánovská, Z. - Máša, B.
Uniform particles formed by hydrolysis of acid mine drainage with urea.
Hydrometallurgy. Roč. 106, 1-2 (2011), s. 12-18. ISSN 0304-386X. E-ISSN 1879-1158
R&D Projects: GA MŠMT LC523; GA MŠMT(CZ) MEB0810136
Institutional research plan: CEZ:AV0Z40320502
Keywords : acid mine drainage * urea hydrolysis * morphology * particles * surface area
Subject RIV: CA - Inorganic Chemistry
Impact factor: 2.027, year: 2011

The study describes a new way of treating of acid mine drainage (AMD) waters containing sulphate of Fe(+3) and Al(+3) as dominant components using homogenous thermal hydrolysis with urea. The model solution and the acid mine drainage solution were kept with urea at one of the selected temperatures (60 degrees C, 80 degrees C and 95 degrees C) in thermostatic bath. X-ray powder diffraction spectra identified four main phases in the hydrolysis products, namely: goethite, schwertmannite. ferrihydrite and jarosite. No crystalline phases of aluminum were detected. Depending on the precipitation conditions, the prepared samples consist of spherical aggregates of nanocrystals of various modifications of hydrated iron oxides. The specific surface area results show that with increasing content of Al(3+), the specific surface area in the final product decreases. The results reveal that by homogenous hydrolysis of acid mine drainage with urea, it is possible to prepare easily filterable relatively pure oxide precipitates with a high degree of separation of Fe and Al.
Permanent Link: http://hdl.handle.net/11104/0203829