Study on physical chemistry of hydrothermal decomposition of zircon

Shu Yin, Minghua Mao

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1 Citation (Scopus)


The physico-chemical aspects of hydrothermal decomposition of zircon have been studied. It is found that NaOH is the efficient reagent for decomposition of zircon. Under the optimum conditions, above 99% of zircon can be decomposed. The effects of various reaction conditions such as temperature, concentration of alkali, solid/liquid ratio, particle size, stirring rate on the decomposition rate are investigated in detail, and rational operation conditions for decomposition have also been given in this paper. The results show that the hydrothermal decomposition reaction ZrSiO4+2NaOH=Na2ZrSiO5+H2O is a diffusion-controlled, non-catalytical, solid/liquid reaction. Based on the experimental data a flow diagram of preparation of ultrafine ZrO2 powders from zircon by hydrothermal reaction method has been suggested. Ultrafine ZrO2 powders with d-0.01 μm can be obtained.

Original languageEnglish
Pages (from-to)238-243
Number of pages6
JournalHuagong yejin
Issue number3
Publication statusPublished - 1992 Aug 1
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)


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