磷尾矿中物质元素的赋存状态与分布

doi:10.19964/j.issn.1006-4990.2023-0068

Abstract

Abstract:

Phosphorite needs flotation treatment to be used in the wet phosphoric acid process.Phosphorite with low phosphorus content is not suitable for phosphoric acid production and discarded，resulting in the accumulation of a large number of phosphorous tailings，which will not only cause environmental pollution，but also cause waste of resources if it is not rationally used.Since there are still more elements such as calcium and magnesium in the phosphorus tailings，the phosphorus tailings can be used according to the enrichment of the elements.Therefore，the occurrence and distribution of main elements such as calcium and magnesium in phosphorus tailings were analyzed by X-ray diffraction analyzer，inductively coupled plasma mass spectrometer，Raman spectrometer，scanning electron microscope，electron probe and X-ray photoelectron spectroscopy.The results showed that calcium was widely distributed in phosphorus tailings，and a large amount of calcium existed in the form of dolomite combined with magnesium，while a small amount of calcium existed in the form of fluorapatite and other calcium-containing compounds with fluorine and phosphorus.Through the complete analysis of phosphorus tailings，the existence form and occurrence state of each element were obtained.It provided guidance for further utilization of calcium and magnesium in phosphorus tailings.

Key words: phosphorus tailings, calcium element, magnesium element, form of existence, occurrence state

CLC Number:

TQ126.31

YANG Junjie, DONG Yonggang, ZHANG Jing, ZHANG Yu, CAO Jianxin. Occurrence and distribution of matter elements in phosphorus tailings[J]. Inorganic Chemicals Industry, 2023, 55(12): 111-118.

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w（CaO）	w（MgO）	w（P₂O₅）	w（SiO₂）	w（F）	w（Na₂O）
40.127	5.460	24.343	11.139	1.690	0.222
w（K₂O）	w（Al₂O₃）	w（SO₃）	w（Fe₂O₃）	w（其他）	烧失量
0.528	3.126	0.311	1.958	0.396	10.7

元素		磷尾矿		元素转移因子/%
氧化物形式	单元素形式	w（氧化物）/%	w（单元素）/%	元素转移因子/%
—	O	—	36.829	—
CaO	Ca	45.674	29.711	34.147
MgO	Mg	17.661	10.651	97.038
P₂O₅	P	6.424	2.713	7.917
SiO₂	Si	2.548	1.159	6.862
F	F	1.008	1.025	17.898
Na₂O	Na	0.111	0.083	14.976
K₂O	K	0.086	0.068	4.889
Al₂O₃	Al	0.395	0.203	3.791
SO₃	S	0.987	0.378	95.281
Fe₂O₃	Fe	0.483	0.289	7.399
其他	其他	0.123	0.091	9.318
烧失率	烧失率	24.500	16.800	—

化学成分	质量分数	化学成分	质量分数
La	4.58×10^-6	Pr	1.30×10^-6
Y	11.16×10^-6	Nb	5.88×10^-6
Ce	5.95×10^-6

物质	结合能/eV					相对含量/%
物质	Ca 2p	Mg 1s	Si 2p	F 1s	P 2p	相对含量/%
CaCO₃	347.30、351.10	—	—	—	—	32.52
Ca₅F（PO₄）₃	347.90、351.55	—	—	685.04	133.82	25.18
CaF₂	348.40	—	—	684.80	—	2.86
CaSiO₃	347.50	—	102.16	—	—	4.07
CaHPO₄	347.00	—	—	—	133.10	3.03
MgF₂	—	1 304.95	—	685.40	—	2.3
MgCO₃	—	1 034.25	—	—	—	17.53
Mg₂SiO₄	—	1 303.60	101.90	—	—	2.76
SiO₂	—	—	103.00、103.80	—	—	6.21
NaH₂PO₄	—	—	—	—	134.10	1.06
Na₂SiF₆	—	—	104.30	686.00	—	0.86
K₂SiF₆	—	—	104.60	686.60	—	0.70
NaF	—	—	—	683.70	—	0.39
KF	—	—	—	684.00	—	0.53

区域	x（O）	x（Ca）	x（Mg）	x（P）	x（F）	x（Al）	x（Si）	x（Fe）	x（Na）	x（K）	x（S）
1	64.79	19.16	15.04	0.22	0.13	0.01	0.06	0.14	—	—	—
2	68.54	2.17	2.52	0.77	0.33	0.66	24.39	0.09	0.06	0.19	0.27
3	65.60	16.43	1.98	9.65	4.89	0.13	0.69	0.03	0.22	0.02	0.36
4	70.70	11.86	6.73	5.46	4.72	0.23	0.13	0.01	0.05	0.01	0.11

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Inorganic Acid-Base-Salt Committee of CIESC

Occurrence and distribution of matter elements in phosphorus tailings

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