Inorganic Chemicals Industry >

2022 , Vol. 54 >Issue 2: 95 - 100

DOI: https://doi.org/10.19964/j.issn.1006-4990.2021-0229

Environment∙Health∙Safety

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

  • Ping XIONG ,
  • Wenzhen YANG ,
  • Qiao LI ,
  • Xiuyun SUN ,
  • Weiqing HAN
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  • 1. School of Environmental and Biological Engineering,Nanjing University of Science and Technology,Nanjing 210014,China
    2. Key Laboratory of Chemical Pollution Control and Resource Utilization of Universities of Jiangsu Province

Received date: 2021-04-21

  Online published: 2022-03-14

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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

Cite this article

Ping XIONG , Wenzhen YANG , Qiao LI , Xiuyun SUN , Weiqing HAN . Study on co-treatment process of waste phosphate and steam ammonia waste liquid[J]. Inorganic Chemicals Industry, 2022 , 54(2) : 95 -100 . DOI: 10.19964/j.issn.1006-4990.2021-0229

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