焙烧工艺及典型杂质对磷石膏还原分解过程影响研究

doi:10.19964/j.issn.1006-4990.2023-0525

Abstract

Abstract:

Phosphogypsum is a by⁃product of industrial wet phosphoric acid production，but because of its high impurity content，it is difficult to utilize，resulting in a huge stockpile.A reduction and decomposition study was conducted using phosphogypsum raw ore and purified phosphogypsum as raw materials，revealing the effects of roasting process and impurities on the high⁃temperature decomposition of phosphogypsum to prepare CaS.The results showed that the decomposition reaction of phosphogypsum raw ore and purified phosphogypsum tended to equilibrium at 60 min，and the reaction loss on ignition could reach 47.77% and 54.44%，respectively.When the product was calcined at 900 ℃ and the reducing agent ratio was above 15%（mass fraction，the same below），there was no residual CaSO₄.The best conditions for the conversion of phosphogypsum into CaS were：the roasting time of 60 min，the roasting temperature of 950 ℃ and the reducing agent ratio of 30%.Under the same conditions，the CaS content of the reduced decomposition products of the purified phosphogypsum group was up to 76.33%，which was higher than that of the phosphogypsum raw ore group under the same conditions（57.37%）.A certain amount of SiO₂，NaF and Ca₃（PO₄）₂ were doped in phosphogypsum，and the CaS content of the product could be reduced by 1.41%~12.27%，0.61%~11.48% and 1.85%~4.82%，respectively by combining with the reaction intermediate product CaO.

Key words: phosphogypsum, thermal decomposition, CaS, impurity, mechanism

CLC Number:

TQ177.375

HU Dian, GUO Ze, ZHANG Hanquan, LU Manman. Research on effects of roasting process and typical impurities on reduction and decomposition process of phosphogypsum[J]. Inorganic Chemicals Industry, 2024, 56(7): 88-95.

Figures/Tables 12

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Research on effects of roasting process and typical impurities on reduction and decomposition process of phosphogypsum

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