Study of Precipitates from Mine Water after Defrosting and Oxidation

Abstract

Acid mine drainage contains many toxic pollutants, mainly heavy metals and sulphates, which have negative impact on the environment. This paper deal with a study of two precipitates from acid mine drainage outflowing from the abandoned mine Smolnik (Slovakia). The precipitates were created after defrosting of mine water and after the process of oxidation. After drying the precipitates were analysed by infrared spectrometry and scanning electron microscopy (SEM) with EDX analysis. Using infrared spectrometry it was found that the precipitate contained OH-, SO42- functional groups. The inhomogeneous structure of the precipitate was observed by SEM with EDX analysis. The presence of CaSO4.2H2O (approx. 90 %) in precipitate after defrosting was confirmed by FTIR and SEM with EDX. Particulate substances after oxidation consisted mainly iron (30.5%), oxygen (44.4 %) and sulphur (7.9 %). Complex compounds with mainly contents of iron (III), hydroxides and sulphate with crystal bound water in structure were identified.

The Influence of Phosphogypsum Addition on Phosphorus Release in Biochemical Treatment of Sewage Sludge

“…The strong broad band at around wavenumbers 3395, 1681, and 1618 cm −1 was assigned to the hydroxyl functional groups. The two separate peaks at wavenumbers about 1681, 1619 cm −1 , and intensely doubled peak at wavenumber 3395 cm −1 on the studied samples show that the –OH functional groups could be present due to bonded crystalline water in the hydrated form of phosphogypsum [ 12 ]. Bands at wavenumbers 1681 and 1619 cm −1 in the phosphogypsum samples are due to the presence of two types of water molecules in gypsum.…”

Снижение Техногенной Нагрузки На Окружающую Среду За Счет Технического Решения По Утилизации Железного Купороса

“…Таким чином, виходячи з багатьох публікацій, найкращі умови для розділення суспензії шляхом декантування або фільтрації встановлюються у разі, коли в суспензії утворюються частинки магнетиту [19][20][21][22].…”