磷尾矿焙烧产品处理氨氮废水的研究

doi:10.19964/j.issn.1006-4990.2024-0202

Abstract

Abstract:

Phosphorus tailings are solid wastes produced after phosphorous ore beneficiation，the main component of which is dolomite.Phosphorus tailings contain less high-value components，which is difficult to use.Long-term and large-scale storage not only occupies land，pollens soil，but also causes resource waste.In this study，the phosphorus tailings were calcined according to their chemical composition characteristics，the calcination process increased the porosity of the phosphorus tailings，enlarged the specific surface area of the product，and improved its reactivity.The results showed that under the optimal roasting condition of 900 ℃ and 60 min，the phosphorus tailings' burning loss rate was 36.76%，with a carbonate content of 5.76% in the product.At this point，the content of CaO and MgO in the product was 53.00% and 29.39% respectively，with the main phases of CaO，MgO，and SiO₂.After roasting under the above conditions，the decomposition of phosphorus tailings was more thorough，and the main phase was transformed into calcium and magnesium oxide，which could be used for ammonia nitrogen wastewater treatment.Under the conditions of 160 g/L dosage，the concentration of ammonia nitrogen in wastewater was decreased from 1 000.0 mg/L to 143.8 mg/L，with a removal rate of 85.62%，the remaining ammonia nitrogen concentration met the subsequent biochemical requirements.The research results could provide some theoretical guidance for the roasting conditions of phosphorus tailings and the treatment of ammonia nitrogen wastewater by the products of phosphorus tailings roasting.

Key words: phosphorus tailings, dolomite, roasting, ammonia nitrogen wastewater, chemical precipitation

CLC Number:

TQ126.3

SHI Yunpeng, GUO Ze, ZHANG Hanquan, LU Manman. Study on treatment of ammonia nitrogen wastewater by roasted phosphorus tailings[J]. Inorganic Chemicals Industry, 2025, 57(3): 94-100.

Figures/Tables 15

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温度/℃	w（CaO）/%	w（MgO）/%	w（SiO₂）/%	w（P₂O₅）/%	w（SO₃）/%	w（Fe₂O₃）/%	w（Al₂O₃）/%	w（F）/%	w（K₂O）/%
800	55.71	24.41	6.16	5.10	3.04	1.92	1.30	0.81	0.68
850	54.58	26.99	5.55	4.85	2.87	1.80	1.13	0.84	0.63
900	53.00	29.39	5.29	4.70	2.82	1.66	1.08	0.77	0.57
950	53.43	29.62	5.19	4.57	2.65	1.61	0.99	0.71	0.53
1 000	52.86	30.25	5.07	4.74	2.63	1.64	0.98	0.72	0.47

时间/min	w（CaO）/%	w（MgO）/%	w（SiO₂）/%	w（P₂O₅）/%	w（SO₃）/%	w（Fe₂O₃）/%	w（Al₂O₃）/%	w（F）/%	w（K₂O）/%
30	54.70	27.09	5.61	4.92	2.68	1.81	1.14	0.66	0.63
60	53.00	29.39	5.29	4.70	2.82	1.66	1.08	0.77	0.57
90	53.03	30.05	5.09	4.56	2.71	1.62	0.99	0.71	0.55
120	52.54	30.53	4.98	4.63	2.76	1.61	0.97	0.75	0.56
150	52.66	30.43	5.04	4.60	2.74	1.62	0.99	0.72	0.52

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Study on treatment of ammonia nitrogen wastewater by roasted phosphorus tailings

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