SU Xiao-bin

(Natural Resources Management Bureau of Zhuanglang County, Pingliang 744699, China)

Abstract: In this paper, the fly ash from coal-fired power plants is used as carrier and magnesium hydroxide is loaded on the surface of fly ash by using the water bath heating method to prepare composite powder, which can be used to absorb copper ions in aqueous solution after geological disasters in mines. The modified fly ash has been characterized by using SEM, EDS, BET, XRD and FTIR methods. The results show that the modified fly ash obviously has a H3 type of hysteretic loop, indicating that the modified fly ash has abundant mesoporous. Comparison of the original and modified fly ashes indicates that the average pore volume is increased from 0.005 m3/g to 0.035 m3/g, the average pore size is increased from 10.23 nm to 13.52 nm, the pore width is increased from 11.36 nm to 14.05 nm, and the specific surface area is increased from 1.09 m2/g to 35.31 m2/g. The removal capability of Cu(Ⅱ) adsorbed by the composite powder material (the modified fly ash) is obviously higher than that of the original fly ash. The Cu(II) adsorption of the composite powder material is mainly carried out by electrostatic attraction and precipitation reaction.

Keywords: fly ash; magnesium hydroxide; composite powder; adsorbent

ACTA MINERALOGICA SINICA Vol. 43, No. 3, 2023, Page 389