11:00 〜 11:15
[3301-10-07] 第二鉄を用いたキャリアマイクロエンカプセレーションによる黄鉄鉱酸化の抑制
司会: 飯塚淳（東北大学）
キーワード：酸性鉱山廃水、黄鉄鉱、カテコール、第二鉄イオン
Oxidation of pyrite (FeS2) is the dominant reason for the formation of acid mine drainage. Carrier Microencapsulation (CME) has been reported as a novel technology to suppress pyrite oxidation by making a protective coating on pyrite surface using Ti4+- or Si4+-catechol complex. In this study, CME using Fe3+-catechol complexes is proposed as a new option to be used in CME.
Mono-, bis-, tris-catecholate of ferric were synthesized based on the results of thermodynamic calculation and were characterized using UV-vis. Electrochemical properties of ferric-catechol complexes were evaluated using liner sweep polarization. The results showed the complexes were decomposed as follows: Fe(cat)33- to Fe(cat)- at +0.12 V vs. Ag/AgCl, Fe(cat)- to Fe(cat)+ at +0.3 V vs. Ag/AgCl and Fe(cat)+ to Fe3+ at +0.42 V vs. Ag/AgCl. The results of leaching experiments showed pyrite oxidation was suppressed by the addition of ferric-catechol complexes. A dark coating was observed in the residues after leaching by microscopy, impling that the passive layer was formed.
Mono-, bis-, tris-catecholate of ferric were synthesized based on the results of thermodynamic calculation and were characterized using UV-vis. Electrochemical properties of ferric-catechol complexes were evaluated using liner sweep polarization. The results showed the complexes were decomposed as follows: Fe(cat)33- to Fe(cat)- at +0.12 V vs. Ag/AgCl, Fe(cat)- to Fe(cat)+ at +0.3 V vs. Ag/AgCl and Fe(cat)+ to Fe3+ at +0.42 V vs. Ag/AgCl. The results of leaching experiments showed pyrite oxidation was suppressed by the addition of ferric-catechol complexes. A dark coating was observed in the residues after leaching by microscopy, impling that the passive layer was formed.
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