Removal of lead from crude antimony by using NaPo3 as lead elimination reagent
In order to solve the shortcomings when removing lead from crude antimony in the traditional antimony smelting, a new process was provided using NaPO3 as lead elimination reagent to yield phosphate slag, and it was removed by floating on the surface of the liquid antimony. Reaction mechanis...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
University of Belgrade, Technical Faculty, Bor
2015-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2015/1450-53391500011Y.pdf |
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| Summary: | In order to solve the shortcomings when removing lead from crude antimony in
the traditional antimony smelting, a new process was provided using NaPO3 as
lead elimination reagent to yield phosphate slag, and it was removed by
floating on the surface of the liquid antimony. Reaction mechanism was
clarified by using the TG-DTA and XRD techniques and single factor
experiments of removal lead from crude antimony were engaged. The results
show that PbO and NaPO3 begin endothermic reaction at 863K (590°C), and the
reaction mainly form NaPb4(PO4)3 and NaPbPO4 below 1123K (850°C) and above
1123K (850°C), respectively. Sb2O3 and NaPO3 start the reaction at 773K
(500°C) and generate an antimonic salt compound. The reaction product of the
mixture of PbO, Sb2O3 and NaPO3 show that NaPO3 reacted with PbO prior when
NaPO3 was insufficient, amorphous antimony glass will be generated only when
NaPO3 was adequate. Single factor experiments were taken with NaNO3 as
oxidizing agent under argon, effect of reaction time, reaction temperature
and dosage of NaPO3 and NaNO3 on smelting results. The average content of
lead in refined antimony was 0.05340% and 98.85% of lead were removed under
optimal conditions; the content of lead in antimony have meet the
requirements of commercial antimony. |
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| ISSN: | 1450-5339 2217-7175 |