XPS study on the mechanism of starch-hematite surface chemical complexation

被引：187

作者：

Moreira, Gabriela F. ^{[1
]}

Pecanha, Elaynne R. ^{[2
]}

Monte, Marisa B. M. ^{[1
,2
]}

Leal Filho, Laurindo S. ^{[1
]}

Stavale, Fernando ^{[3
]}

机构：

[1] ITV, Ave Juscelino Kubitschelc 31, BR-35400000 Ouro Preto, MG, Brazil

[2] Coordinat Mineral Proc CETEM, Lab Surface Chem, Ave Pedro Calmon,900 Ilha Cidade Univ, BR-21941972 Rio De Janeiro, RJ, Brazil

[3] MCTI, CBPF, Rua Xavier Sigaud 150, BR-22290180 Rio De Janeiro, RJ, Brazil

来源：

MINERALS ENGINEERING | 2017年 / 110卷

关键词：

Iron ore; Starch; Flotation; XPS; FTIR; X-RAY PHOTOELECTRON; SELECTIVE FLOCCULATION; IRON-OXIDE; ADSORPTION; FLOTATION; FE; GOETHITE; SPECTRA; PHOTOEMISSION; SPECTROSCOPY;

D O I：

10.1016/j.mineng.2017.04.014

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Polysaccharides are some of the most widely employed flotation reagents in the mineral processing industry. Among several, starch is of particular importance for reverse flotation of iron ores. It is known to behave as an efficient depressant for hematite and, therefore, its interaction is of great relevance. In this paper, we investigate the surface chemistry of starch adsorbed onto hematite by means of X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. Our results indicate that starch undergoes an important oxidation process under industrial gelatinization conditions, which favors the binding of starch molecules. Meanwhile, the oxide surface is subjected to full hydroxylation, leading to strong polysaccharide-metal hydroxide interaction. Previously proposed starch interaction mechanisms are discussed, and the importance of acid-base interactions is underscored.

引用

页码：96 / 103

页数：8

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