Influence of Cu(NO3)2 in H2SO4-H2O on the Growth of Desulfurized Gypsum Whiskers

Abstract

Abstract: Desulfurized gypsum whiskers were prepared by hydrothermal method using treated desulfurized gypsum as raw materials, and Cu(NO₃)₂ was used as the crystal form control agent in the H₂SO₄-H₂O system. The influence mechanism of Cu(NO₃)₂ on the growth of desulfurized gypsum whiskers was discussed. The results show that Cu(NO₃)₂ has obvious dissolution-promoting effect on desulfurized gypsum, and Cu²⁺ could reduce the activity coefficient of each ion in the solution and increase the concentration of Ca²⁺ in the solution. Moreover, NO^-₃ accumulate around Ca²⁺ and shield SO^2-₄ through electrostatic action, which cause the desulfurized gypsum dissolve continuously and keep the concentration of Ca²⁺ and SO^2-₄ in a relatively stable state, and facilitate the nucleation and growth of hemihydrate desulfurized gypsum crystals. In addition, Cu²⁺ selectively adsorb on the surface of the whiskers to generate CuSO₄ during the growth of the whiskers, thereby improve the crystal growth of desulfurized gypsum whiskers. When the amount of Cu(NO₃)₂ is 2.0% (mass fraction), desulfurized gypsum whiskers with an aspect ratio of about 73 are prepared.

Key words: desulfurized gypsum, Cu(NO₃)₂, whisker, H₂SO₄-H₂O system, crystallization, influence mechanism

CLC Number:

TQ177.3
O784

WANG Xiao, MA Xiaoxiao, JIN Biao, ZHANG Xiaoting, ZHANG Jianwu, YANG Liushuan, WANG Yubin. Influence of Cu(NO₃)₂ in H₂SO₄-H₂O on the Growth of Desulfurized Gypsum Whiskers[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2021, 50(12): 2316-2322.

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Influence of Cu(NO₃)₂ in H₂SO₄-H₂O on the Growth of Desulfurized Gypsum Whiskers

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