52
H.-P. Gou et al.
As is known to all, the low grade lead–zinc oxide ore has a higher solubility and
an extensive hydration of oxide surfaces. It makes the low grade lead–zinc oxide ore
more difficult to float than the sulfide ores [6]. Zhao studied the alkaline leaching of
smithsonite ores [7]. It was found that over 85% of both Zn and Pb, and less than
10% of Al could be leached from the ore by using 5 M NaOH solution at 368 K.
Meanwhile, the waste water was produced during the hydrometallurgical process.
The environmental protection pressure of hydrometallurgy in China is increasing in
recent years. It is necessary to find out an effective pyrometallurgy process to obtain
lead and zinc from the oxide ore. Thermal decomposition of basic zinc carbonate
in the N 2 atmosphere was studied by Liu [8]. It was found that the increase in the
sample size caused an increase in the reaction temperature and a decrease in the value
of the apparent activation energy.
However, there are few researches reported on the oxidation mechanism of the
low grade lead–zinc oxide ore. In this research, the oxidation process of the low grade
lead–zinc oxide ore was studied. The aim of the present work was to investigate the
phase evolution and reaction mechanism during the oxidation process, which was a
foundation for the further pyrometallurgy process.
Materials and Methods
The low grade lead–zinc oxide ore produced in Yunnan Province was used as raw
materials, which was characterized by X-ray diffraction (XRD) in a 2θ range of 10°–
90°. As shown in Fig. 1, the main mineral phases of the low grade lead–zinc oxide ore
are CaMg(CO 3 ) 2 , Zn 0.776 Fe 0.224 S, CaCO 3 , PbCO 3, and Zn 4 Si 2 O 7 (OH) 2 ·H 2 O. The
contents of the main elements in the ore were determined by inductively coupled
plasma-mass spectrometry (ICP-MS) and carbon–sulfur analyzer, which are shown
Fig. 1 XRD patterns of the
low grade lead–zinc oxide
ore
H.-P. Gou et al.
As is known to all, the low grade lead–zinc oxide ore has a higher solubility and
an extensive hydration of oxide surfaces. It makes the low grade lead–zinc oxide ore
more difficult to float than the sulfide ores [6]. Zhao studied the alkaline leaching of
smithsonite ores [7]. It was found that over 85% of both Zn and Pb, and less than
10% of Al could be leached from the ore by using 5 M NaOH solution at 368 K.
Meanwhile, the waste water was produced during the hydrometallurgical process.
The environmental protection pressure of hydrometallurgy in China is increasing in
recent years. It is necessary to find out an effective pyrometallurgy process to obtain
lead and zinc from the oxide ore. Thermal decomposition of basic zinc carbonate
in the N 2 atmosphere was studied by Liu [8]. It was found that the increase in the
sample size caused an increase in the reaction temperature and a decrease in the value
of the apparent activation energy.
However, there are few researches reported on the oxidation mechanism of the
low grade lead–zinc oxide ore. In this research, the oxidation process of the low grade
lead–zinc oxide ore was studied. The aim of the present work was to investigate the
phase evolution and reaction mechanism during the oxidation process, which was a
foundation for the further pyrometallurgy process.
Materials and Methods
The low grade lead–zinc oxide ore produced in Yunnan Province was used as raw
materials, which was characterized by X-ray diffraction (XRD) in a 2θ range of 10°–
90°. As shown in Fig. 1, the main mineral phases of the low grade lead–zinc oxide ore
are CaMg(CO 3 ) 2 , Zn 0.776 Fe 0.224 S, CaCO 3 , PbCO 3, and Zn 4 Si 2 O 7 (OH) 2 ·H 2 O. The
contents of the main elements in the ore were determined by inductively coupled
plasma-mass spectrometry (ICP-MS) and carbon–sulfur analyzer, which are shown
Fig. 1 XRD patterns of the
low grade lead–zinc oxide
ore