Hydrometallurgical Recovery …
523
Fig. 3 pH and Sn, Pb
concentration of leachate
Fig. 4 Temporal change of
Sn, Pb concentration of
leachate
Table 2 Typical composition of leachate
Element
Sn
As
Te
Se
Pb
Sb
Concentrations (mg/L)
25,000
10,000
230
79
66
24
the leachate increases the maximum at 8 h and remains constant after that while the
lead concentration stays at the same level as shown in Fig. 4. Typical assay of the
leachate obtained by the present experiments is listed in Table 2, showing rich tin
and arsenic have eluted into the leachate.
Stable Burtite Synthesis
Ca/Sn (molar ratio) in this section indicates the molar ratio of the amount of added
calcium to the amount of tin in the leachate. Any calcium compound examined