Mechanochemical route for synthesizing KMgPO4 and NH4MgPO4 for application as slow-release fertilizers

Solihin, Qiwu Zhang, William Tongamp, Fumio Saito

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


This article introduces a mechanochemical (MC) process for the synthesis of KMgPO4 and NH4MgPO4 by milling starting materials in a planetary ball mill. First, KMgPO4 was prepared by milling KHPO4 and Mg(OH)2 at a molar ratio of 1:1 for 120 min at mill rotational speeds of 500-600 rpm. Washing of KMgPO4 in water for 700 h released only up to 20-25% of K+ and PO4 2- ions into solution. Second, NH4MgPO4 was prepared by milling NH4HPO4 and Mg(OH)2 at a molar ratio of 1:1 for 120 min at mill rotational speeds of 300-700 rpm. Washing of NH4MgPO4 in water for 500 h released only up to 10-20% of NH4+ and PO42- ions into solution. The MC process could be developed to synthesize KMgPO4 and NH4MgPO4 for possible application as slow-release fertilizers.

Original languageEnglish
Pages (from-to)2213-2216
Number of pages4
JournalIndustrial and Engineering Chemistry Research
Issue number5
Publication statusPublished - 2010 Mar 3

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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