Publication date: 31 October 2018
Source:Separation and Purification Technology, Volume 205
Author(s): Weifeng Liu, Baiqi Sun, Duchao Zhang, Lin Chen, Tianzu Yang
In the face of difficulties in separating similar metals from acidic wastewater, a new process is proposed to selectively separate metals from acidic wastewater by controlling potential. In this paper, the effect of pH value on precipitation ratio and separation efficiency is investigated. Through thermodynamic calculations, a 3D E-pH diagram of the Me-S-H2O system was plotted. The results reveal that rising pH value is helpful for metal precipitation, but high pH value may cause co-precipitation of metals impurity. The crystallinity and size of precipitates are obviously affected by pH value. Co can be effectively separated from Zn by xanthate precipitation under controlling potential, and the xanthate dosage is dependent on pH value. Mn-inclusions appear in Zn-precipitate due to high Mn2+ concentration. The optimal pH value for Cu2+, Co2+, and Zn2+ precipitation were 1, 2, and 2, respectively. Mn2+ could be recovered by carbonate precipitation from the solution after Zn removal. Cu2+, Co2+, Zn2+, and Mn2+ precipitation ratios reached to 99%.
https://ift.tt/2IN3mpl
Σφακιανάκης Αλέξανδρος
ΩτοΡινοΛαρυγγολόγος
Αναπαύσεως 5 Άγιος Νικόλαος
Κρήτη 72100
00302841026182
00306932607174
alsfakia@gmail.com
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Σάββατο 26 Μαΐου 2018
Effect of pH on the selective separation of metals from acidic wastewater by controlling potential
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- Is the encoding of Reward Prediction Error reliabl...
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- The increase in fiber size in male rat gastrocnemi...
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