Effect of magnetic starch on the clarification of hematite tailings wastewater

International Conference on Energy Engineering and Environmental Protection 2017

能源学;生态环境科学

Yue, Tao^1 ; Wu, Xiqing^1

School of Minerals Processing and Bioengineering, Central South University, Changsha

410083, China^1

关键词: Hematite particles;    Hematite tailings;    Long-range forces;    Magnetic interactions;    Magnetic seed;    Magnetic starches;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/121/3/032051/pdf
DOI  :  10.1088/1755-1315/121/3/032051

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The magnetic starch solution, synthesized by mixing the caustic starch, the Fe2+solution (in some cases containing the Zn2+, Cu2+, Mn2+or Mg2+ions) and H2O2solution, was used as the flocculant to investigate its clarification effect on hematite tailings wastewater. Based on the clarification tests and adsorption analysis it was demonstrated that the magnetic starch produced better clarification effect than the caustic starch, and the adsorption of magnetic starch onto hematite tailings particles was also stronger than the caustic starch. AFM found that the magnetic interaction between magnetic seeds and hematite is characteristic of long range force and greatly strengthens the adsorption of magnetic seeds onto fine hematite for agglomeration. FTIR indicates the starch adsorbed onto the surfaces of hematite and magnetic seeds, thus acting as the bridging between hematite particles and magnetic seeds, resulting in an intensified coverage of the starch onto hematite and positive action in the clarification.