Study on the Effect Mechanism of EDTA on the Preparation of Ultrafine Gypsum Powder

WANG Wenwen; MA Xiaoxiao; WANG Yubin; HUA Kaiqiang; YU Bo; LI Shuqin

doi:10.13779/j.cnki.issn1001-0076.2021.04.012

2021 Vol. 41, No. 4

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Article navigation > Conservation and Utilization of Mineral Resources > 2021 > 41(4): 100-106

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WANG Wenwen, MA Xiaoxiao, WANG Yubin, HUA Kaiqiang, YU Bo, LI Shuqin. Study on the Effect Mechanism of EDTA on the Preparation of Ultrafine Gypsum Powder[J]. Conservation and Utilization of Mineral Resources, 2021, 41(4): 100-106. doi: 10.13779/j.cnki.issn1001-0076.2021.04.012

Citation:

WANG Wenwen, MA Xiaoxiao, WANG Yubin, HUA Kaiqiang, YU Bo, LI Shuqin. Study on the Effect Mechanism of EDTA on the Preparation of Ultrafine Gypsum Powder[J]. Conservation and Utilization of Mineral Resources, 2021, 41(4): 100-106. doi: 10.13779/j.cnki.issn1001-0076.2021.04.012

Study on the Effect Mechanism of EDTA on the Preparation of Ultrafine Gypsum Powder

Xi'an University of Architecture and Technology, School of Resources Engineering, Xi'an 710055, Shaanxi, China

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Corresponding author: WANG Yubin, wywywyb@xauat.edu.cn

Received Date: 08 July 2021

Publish Date: 25 August 2021

Abstract

Abstract

To clarify the mechanism of EDTA in the procession of ultrafine grinding of gypsum, viscosity, XRD, XPS and infrared spectroscopy were used to characterize the gypsum slurry and its ultrafine grinding products. The results showed that EDTA with a dosage of 0.40% could effectively strengthen the strain effect and grain refinement effect in the gypsum lattice and reduced the crystallinity and particle size of the gypsum, then reduced its d₅₀ from 42.43 μm to 16.69 μm under the conditions of a discharge port width of 12 mm, a slurry concentration of 20% and an ultra-fine grinding time of 15 minutes. Ca(COO)₂, generated by EDTA and Ca²⁺ of gypsum surface, covered hydroxylated active point Ca²⁺ which causes a negative increase in zeta potential, thereby reduced the relative content of adsorption water on the surface of the gypsum and the bonded force between the gypsum particles. The mentioned effects not only enhanced the repulsion between the gypsum particles to form a stable dispersion system, but also increased the turbidity of the gypsum slurry by 27.78% and decreased the viscosity by 18.16%, so improved the ultrafine grinding effect of EDTA on the gypsum finally.
- gypsum /
- ultrafine grinding /
- EDTA /
- mechanism

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References

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