废磷酸盐与蒸氨废液共处理工艺研究

doi:10.19964/j.issn.1006-4990.2021-0229

Abstract

Abstract:

Waste phosphate（PW） is a kind of solid waste mainly composed of Na₃PO₄.Steam ammonia waste solution（DW） is a waste solution with high pH（generally higher than 11） mainly composed of CaCl₂.Both kinds of wastes are produced in large quantities and are difficult to be treated and disposed.At present,there is few research on the recycling of them.Based on the characteristics of PW with high phosphorus content and DW with high calcium content and high pH,a waste co-treatment process was proposed,in which phosphorus and calcium resources were recovered synchronously by precipitation method.The phosphorus reserve solution was prepared by pretreatment of PW and co-treatment with DW.The effect of n（Ca）/n（P）,dosing sequence,DW concentration,pH and aging time on the recovery of Ca and P and the products was investigated,and the application possibility of the products was also studied.The results showed that n（Ca）/n（P）=1.67 and adding the ammonia waste liquor to phosphorus reserve solution（Ca→P） was the best reaction conditions for co-treatment.Under these conditions,the recoveries were greater than 98.90%.The concentration and pH of DW had little effect on the recovery,and the recovery rates of Ca and P were less than 2.00%.With the increasing of aging time,the recovery rate of calcium increased and the recovery rate of phosphorus decreased.The product was gradually transformed from amorphous calcium phosphate（ACP） to hydroxyapatite（HAP）,and the molar ratio of n（Ca）/n（P） increased.The products obtained by different aging time had application potential.This study provides a new idea for the resource utilization of PW and DW.

Key words: waste phosphate, steam ammonia waste liquid, co-treatment

CLC Number:

TQ126.3

XIONG Ping,YANG Wenzhen,LI Qiao,SUN Xiuyun,HAN Weiqing. Study on co-treatment process of waste phosphate and steam ammonia waste liquid[J]. Inorganic Chemicals Industry, 2022, 54(2): 95-100.

Figures/Tables 12

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References 29

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陈化时间/h	n（Ca）/n（P）=1		n（Ca）/n（P）=1.5		n（Ca）/n（P）=1.67		n（Ca）/n（P）=2		n（Ca）/n（P）=2.5		n（Ca）/n（P）=3
陈化时间/h	P	Ca	P	Ca	P	Ca	P	Ca	P	Ca	P	Ca
0	77.50	>99.99	97.41	99.98	>99.99	98.93	>99.99	89.04	>99.99	76.80	>99.99	69.00
6	74.19	>99.99	97.26	99.99	99.93	99.86	>99.99	89.19	>99.99	76.99	>99.99	69.37
12	70.44	>99.99	97.10	99.99	99.73	99.89	>99.99	89.31	>99.99	77.14	>99.99	69.72
24	69.25	>99.99	96.97	>99.99	99.66	99.93	>99.99	89.76	>99.99	78.39	>99.99	70.57
48	69.72	>99.99	96.51	>99.99	99.62	99.96	99.99	90.61	>99.99	79.02	>99.99	70.73

项目		w（有效P₂O₅）	w（碱分,以CaO计）	w（水分）
指标	优等品	≥18.0	≥45.0	≤0.5
	一等品	≥15.0	—	≤0.5
	合格品	≥12.0	—	≤0.5
产物		≥30.7	≥44.2	≤0.2

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Inorganic Acid-Base-Salt Committee of CIESC

Study on co-treatment process of waste phosphate and steam ammonia waste liquid

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