转晶剂对磷石膏制备无水硫酸钙影响的研究

doi:10.19964/j.issn.1006-4990.2023-0301

Abstract

Abstract:

The production of phosphogypsum（PG） is large，and its resource utilization is difficult，which seriously affects the development of phosphorus chemical industry.In order to improve the added value of PG application，anhydrous CaSO₄ with high whiteness was prepared by normal pressure salt solution method with PG as raw material，NaCl and EDTA-2Na as crystallization agents.The effect of crystal transition agent on the preparation of anhydrous CaSO₄ was studied by SEM，XRD，FT-IR and particle size analyzer.The results showed that when the mass fraction of NaCl was 15% and the mass fraction of EDTA-2Na was 0.5%，the dehydration time of PG crystal water was shortened from 120 min to 40 min，and the dehydration effect was remarkable.At the same time，the particle size distribution of anhydrous CaSO₄ crystal was uniform，the particle surface was complete，the D₅₀ was 5.26 μm，the whiteness was 92.5%，and the P₂O₅ content was only 0.045%.It was mainly because non-lattice Na⁺ reduced the activity of water in the system，and promoted the dehydration，crystallization and impurity removal of PG.The coordination ion layer formed by the coordination between carboxyl groups in EDTA-2Na and Ca²⁺on the surface of gypsum crystal could regulate the growth of anhydrous CaSO₄ crystal and modify the crystal face.

Key words: phosphogypsum, crystal modifier, anhydrous CaSO₄, normal pressure salt solution method

CLC Number:

TQ177.3

WANG Mingshun, AO Xianquan, YUAN Xing, DONG Wenyan, CHEN Qianlin. Study on effect of crystallizer on preparation of anhydrous calcium sulfate from phosphogypsum[J]. Inorganic Chemicals Industry, 2024, 56(5): 101-107.

Figures/Tables 12

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References 23

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样品	w（SO₃）	w（CaO）	w（SiO₂）	w（P₂O₅）	w（F）	w（Fe₂O₃）	w（Na₂O）	w（Al₂O₃）	w（MgO）	w（TiO₂）	白度值
原料PG	55.23	37.00	5.17	0.88	0.47	0.333	0.053	0.37	0.053	0.083	32.5
预处理PG	56.84	42.22	0.08	0.60	—	0.015	0.051	0.062	—	0.026	70.9

样品	Span值	样品	Span值
a	2.39	c	2.32
b	2.31	d	1.86

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Study on effect of crystallizer on preparation of anhydrous calcium sulfate from phosphogypsum

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