无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2020, Vol. 52 ›› Issue (2): 43-46.doi: 10.11962/1006-4990.2019-0117

• 工业技术 • 上一篇    下一篇

磷酸活化磷尾矿制取聚合态钙镁磷肥的工艺条件研究

郑建国1,于南树1,2,3,刘永秀1,宋涛1,2,胡兆平1,2,3()   

  1. 1. 养分资源高效开发与综合利用国家重点实验室/金正大生态工程集团股份有限公司,山东临沭 276700
    2. 国家缓控释肥工程技术研究中心
    3. 贵州省磷化工清洁生产工程技术研究中心
  • 收稿日期:2019-08-17 出版日期:2020-02-10 发布日期:2020-02-26
  • 作者简介:郑建国(1990— ),男,研究员,中级工程师,硕士,主要从事磷资源高效利用及新型肥料开发相关工作;E-mail:804352453@qq.com。
  • 基金资助:
    新型缓控释肥料与稳定肥料研制 国家重点研发计划(2017YFD0200700);非常规硝酸分解磷矿清洁生产关键技术及工程示范(2018YFC190062-5)

Study on technological conditions of polymeric calcium magnesium phosphate fertilizer from phosphoric acid activated phosphate tailings

Zheng Jianguo1,Yu Nanshu1,2,3,Liu Yongxiu1,Song Tao1,2,Hu Zhaoping1,2,3()   

  1. 1. State Key Laboratory of Nutrition Resources Integrated Utilization,Kingenta Ecological Engineering Group Co.,Ltd.,Linzhu 276700,China
    2. Engineering Technology Research Center For SCRF
    3. Guizhou Phosphorus Chemical Cleaner Production Engineering Technology Research Center
  • Received:2019-08-17 Published:2020-02-10 Online:2020-02-26

摘要:

为减少磷尾矿对环境的损害,采用高温分子间脱水聚合的方法,对利用磷尾矿合成聚合态钙镁磷肥做了研究。将磷酸和磷尾矿按照物质的量比[n(P2O5)∶n(CaO+MgO)]为1∶(1.2~1.8)进行混合反应,将反应的料浆在250~600 ℃下煅烧1~5 h得到干基的产品。产品检测结果表明,聚合态钙镁磷肥的聚合度为1~4,P2O5的聚合率在80%以上,总P2O5质量分数为50%~60%,CaO质量分数为17%左右,MgO质量分数为12%左右,产品结构为多孔隙的球状结构。该产品可以根据不同地区的需要灵活调整原料配比,以得到不同性质的产品。该研究已经在中试装置中进行试生产,正式生产车间目前正在中国贵州建设,目标产能为20万t/a。

关键词: 钙镁磷肥, 磷尾矿, 聚合态, 废弃物, 新型肥料

Abstract:

In order to reduce the environmental damage caused by phosphorus tailings,the synthesis of polymeric calcium magnesium phosphate fertilizer from phosphorus tailings by high temperature intermolecular dehydration polymerization was studied.Phosphoric acid and phosphorus tailings were mixed at the amount-of-substance ratio of P2O5 to(CaO+MgO) of 1∶(1.2~1.8),and the slurry was calcined at 250~600 ℃ for 1~5 h to obtain dry-base products.The results showed that the degree of polymerization of polymeric calcium magnesium phosphate fertilizer was 1~4,the polymerization rate of P2O5 was more than 80%,the total P2O5 was 50%~60%(mass fraction),the mass fraction of CaO was about 17%,the mass fraction of MgO was about 12%,and the product structure was porous spherical structure.The product can be flexibly adjusted according to the needs of different regions to obtain products of different properties.The research has been put into trial production in pilot plant,and the formal production workshop is currently being constructed in Guizhou,China,with a target capacity of 200 kt/a.

Key words: calcium magnesium phosphate fertilizer, phosphorus tailings, polymer state, waste, new fertilizer

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