Recovery of Lead from Zinc Plant Residue by Alkaline Leaching …
255
Fig. 1 XRD pattern of the
initial ZPR sample
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60
70
80
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Intensity (a.u.)
Angle (2θ)
∇ - PbSO 4
Initial sample
Methods
Leaching
The alkaline leaching was performed in a glass reactor (jacketed) with the magnetic
stirrer set up in conjunction with a temperature controlled water bath circulator. After
adding the predetermined concentration of NaOH solution to the reactor and setting
the leaching temperature, a known amount of sample was added to the reactor. At the
desired time intervals, 5 mL of slurry was withdrawn from the reactor, and the filtered
solution was analyzed by using the Inductively Coupled Plasma-Atomic Emission
Spectroscopy (ICP-AES; JY-38 plus, Jobin Yvon Ltd.).
Cementation
The cementation was also performed in a jacketed reactor set up with a temperature
controlled water bath circulator. The leach liquor was transferred to the reaction
vessel, and a predetermined weight of Zn powder was added for lead cementation
at a desired temperature and agitation speed. The characterization of cemented lead
particles was carried out using the scanning electron microscope (SEM) and energy
dispersive X-ray (EDX) analyzer (Feico-95 Nova SEM).
255
Fig. 1 XRD pattern of the
initial ZPR sample
10
20
30
40
50
60
70
80
∇ ∇
∇
∇
∇
∇
∇
∇
∇
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∇
∇
∇
∇
∇
∇
∇
∇
∇
∇
∇
∇
∇
∇
∇
∇
Intensity (a.u.)
Angle (2θ)
∇ - PbSO 4
Initial sample
Methods
Leaching
The alkaline leaching was performed in a glass reactor (jacketed) with the magnetic
stirrer set up in conjunction with a temperature controlled water bath circulator. After
adding the predetermined concentration of NaOH solution to the reactor and setting
the leaching temperature, a known amount of sample was added to the reactor. At the
desired time intervals, 5 mL of slurry was withdrawn from the reactor, and the filtered
solution was analyzed by using the Inductively Coupled Plasma-Atomic Emission
Spectroscopy (ICP-AES; JY-38 plus, Jobin Yvon Ltd.).
Cementation
The cementation was also performed in a jacketed reactor set up with a temperature
controlled water bath circulator. The leach liquor was transferred to the reaction
vessel, and a predetermined weight of Zn powder was added for lead cementation
at a desired temperature and agitation speed. The characterization of cemented lead
particles was carried out using the scanning electron microscope (SEM) and energy
dispersive X-ray (EDX) analyzer (Feico-95 Nova SEM).