焙烧-水化络合法脱除镁废渣中钙杂质的研究

doi:10.19964/j.issn.1006-4990.2022-0095

Abstract

Abstract:

The high-purity magnesium oxide was prepared from calcium-magnesium-containing waste residue as raw materials by the high-temperature roasting-EDTA complexing method to remove calcium impurities.The effects of calcination temperature and time，molar concentration of EDTA solution，complexation temperature，liquid solid ratio and hydration time on removal of calcium impurities were investigated.The structure of the product was characterized by means of X-ray diffraction（XRD），X-ray photoelectron spectroscopy（XPS），and other methods.The results showed that calcium and magnesium were existed in the form of CaCO₃ and 4MgCO₃·Mg（OH）₂·4H₂O in the magnesium waste residue and decomposed into CaO and MgO after high temperature roasting，respectively.Thermodynamic calculation showed that the complexing ability of calcium，magnesium ions，and EDTA in the system was quite different.EDTA had a strong complexing ability with Ca²⁺，but very weak with Mg²⁺.The complexation promoted the dissolution of CaO and made Ca²⁺ enter the liquid phase.MgO was stayed in the solid phase to enable calcium separate from magnesium.At 800 ℃，0.5 h，c（EDTA）=0.01 mol/L，liquid solid ratio of 80∶1 and hydration at room temperature for 2.0 h，the calcium removal rate reached 98.78%.When the product was dried at 105 ℃ for 8.0 h，the purity of MgO was greater than 99.00%.

Key words: magnesium waste residue, high-temperature roasting-EDTA complexation, calcium oxide, magnesium oxide

CLC Number:

X781

ZENG Yanjie,XU Tongfei,HUANG Ziliang,CHEN Zhipeng,LIU Xudong,YI Meigui. Study on removal of calcium impurities from magnesium waste residue by roasting-hydration complexing[J]. Inorganic Chemicals Industry, 2022, 54(11): 118-123.

Figures/Tables 9

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Study on removal of calcium impurities from magnesium waste residue by roasting-hydration complexing

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