Utilization of Alkali-Activated Lead-Zinc Smelting Slag for Chromite Ore Processing Residue Solidification

Abstract

Abstract: Lead-zinc smelting slag (LZSS) was used to prepare alkali-activated materials and solidify chromite ore processing residue (COPR) to realize waste co-treatment. Single-factor and orthogonal experiments were carried out which aim to explore the effects of various parameters (alkali content, water glass modulus, liquid-solid ratio, and initial curing temperature) for alkali-activated LZSS strength. Based on the above experiments, COPR was solidified by alkali-activated LZSS. Additionally, compressive strength and leaching toxicity were the indexes to evaluate the performance of the solidified bodies containing COPR. The results show that when the alkali content is 2.5% (mass fraction, the same below), the water glass modulus is 1.5, the liquid-to-solid ratio is 0.19, the initial curing temperature is 35 ℃, the compressive strength of alkali-activated LZSS reaches up to 84.49 MPa. With the increase of COPR content, the compressive strength of solidified bodies gradually decreases, and when 40% COPR is added, the compressive strength decreases to 1.42 MPa. However, the leaching concentrations of Zn and Cr from all the solidified bodies (the content of COPR is 0%~40%) are far below the critical limits (US EPA Method 1311 and China GB 5085.3—2007). Heavy metal ions in LZSS and COPR are immobilized successfully by chemical and physical means, which is manifested by the analyses of environmental scanning electron microscope with energy dispersive spectrometry, Fourier transform infrared spectrometry, and X-ray diffraction. The results show that alkali-activated LZSS can solidify COPR effectively.

Key words: lead-zinc smelting slag, chromite ore processing residue, resource utilization, alkali-activated material, waste co-treatment

CLC Number:

X758

FANG Lu, HUANG Xiao. Utilization of Alkali-Activated Lead-Zinc Smelting Slag for Chromite Ore Processing Residue Solidification[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(8): 2631-2639.

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