磷石膏提质降杂实验研究

doi:10.19964/j.issn.1006-4990.2020-0397

Abstract

Abstract:

The comprehensive utilization of phosphogypsum has important implications for protecting the environment and pro-moting the sustainable development of enterprises.Phosphogypsum utilization is affected by impurities such as phosphorus,fluorine and silicon dioxide in phosphogypsum.In order to solve the problem of high silicon dioxide content in phosphogypsum from Yunnan,the experimental study on improving quality and reducing impurity of phosphogypsum was carried out by using direct flotation process.Through the single factor condition test,the suitable process conditions were as following: the flotation temperature was 15 ℃,pH of pulp was 2.0,dodecylamine was as the collector with a dosage of 300 g/t.By adopting the opencircuit flotation flowsheet of one-stage roughing and two-stage cleaning,a concentrate product containing 97.50% of CaSO₄·2H₂O and 1.17% of SiO₂ was obtained,and it reached the first grade requirements of the national standard GB/T 23456—2018 pho-sphogypsum.The recovery of CaSO₄·2H₂O and removal of SiO₂ were 98.58% and 92.23% respectively.The effective separation of CaSO₄·2H₂O and SiO₂ was successfully achieved by direct flotation.Simultaneously,the water-soluble phosphorus and the water-soluble fluorine in phosphogypsum were also effectively removed.Thus the quality of phosphogypsum was improved.

Key words: phosphogypsum, direct flotation, calcium sulfate dehydrate, silica

CLC Number:

TQ126.35

Zhang Lizhen,Lü Zihu,Zhang Yongxing,Wu Zhaoyang,Zhang Xiufeng,Tan Xiumin. Experimental study on improving quality and reducing impurity of phosphogypsum[J]. Inorganic Chemicals Industry, 2021, 53(6): 171-173.

Figures/Tables 8

Table 1

Fig.1

Fig.2

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Fig.4

Table 2

Fig.5

Table 3

化学成分	质量分数/%	化学成分	质量分数/%
CaO	28.19	K₂O	0.27
SO₃	36.42	Na₂O	0.081
SiO₂	12.03	总P₂O₅	0.92
Al₂O₃	0.74	水溶性P₂O₅	0.33
Fe₂O₃	0.14	总F	0.32
MgO	0.062	水溶性F	0.25

产品名称	产率/ %	石膏品位/%		石膏回收率/%
产品名称	产率/ %	SiO₂	CaSO₄·2H₂O	SiO₂	CaSO₄·2H₂O
精矿	85.45	1.17	97.50	7.77	98.58
中矿2	0.72	46.68	43.70	2.60	0.37
中矿1	1.92	71.20	20.66	10.62	0.47
尾矿	11.91	85.36	6.24	79.00	0.88
合计	100.00	12.87	84.77	100.00	100.00

项目		w（CaSO₄· 2H₂O,干基）/%	w（水溶性P₂O₅, 干基）/%	w（水溶性F^-,干基）/%	w（水溶性MgO, 干基）/%	w（水溶性Na₂O, 干基）/%	w（Cl^-, 干基）/ %
国标	一级	≥90	≤0.20	≤0.10	≤0.10	≤0.06	≤0.02
国标	二级	≥80	≤0.30	≤0.20	≤0.30	≤0.10	≤0.04
精矿产品		97.5	0.08	0.02	0.024	0.009	0.000 2

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Inorganic Acid-Base-Salt Committee of CIESC

Experimental study on improving quality and reducing impurity of phosphogypsum

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