https://wiki.tiffa.net/w/index.php?action=history&feed=atom&title=Translations%3AFertilizer%2F29%2Fen 2026-09-29T02:06:46Z Revision history for this page on the wiki MediaWiki 1.43.0 https://wiki.tiffa.net/w/index.php?title=Translations:Fertilizer/29/en&diff=163267&oldid=prev 2025-07-15T09:11:18Z

<p>Importing a new version from external source</p> <p><b>New page</b></p><div>===Phosphate fertilizers===<br /> [[File:Siilinjärvi Särkijärvi pit.jpg|thumb|left|An apatite mine for phosphates in [[Siilinjärvi carbonatite|Siilinjärvi]], Finland]]<br /> Phosphate fertilizers are obtained by extraction from [[phosphate rock]], which contains two principal phosphorus-containing minerals, [[fluorapatite]] Ca&lt;sub&gt;5&lt;/sub&gt;(PO&lt;sub&gt;4&lt;/sub&gt;)&lt;sub&gt;3&lt;/sub&gt;F (CFA) and [[hydroxyapatite]] Ca&lt;sub&gt;5&lt;/sub&gt;(PO&lt;sub&gt;4&lt;/sub&gt;)&lt;sub&gt;3&lt;/sub&gt;OH. Billions of kg of phosphate rock are mined annually, but the size and quality of the remaining ore is decreasing. These minerals are converted into water-soluble phosphate salts by treatment with [[acid]]s. The large production of [[sulfuric acid]] is primarily motivated by this application. In the [[nitrophosphate process]] or Odda process (invented in 1927), phosphate rock with up to a 20% phosphorus (P) content is dissolved with [[nitric acid]] (HNO&lt;sub&gt;3&lt;/sub&gt;) to produce a mixture of phosphoric acid (H&lt;sub&gt;3&lt;/sub&gt;PO&lt;sub&gt;4&lt;/sub&gt;) and [[calcium nitrate]] (Ca(NO&lt;sub&gt;3&lt;/sub&gt;)&lt;sub&gt;2&lt;/sub&gt;). This mixture can be combined with a potassium fertilizer to produce a &#039;&#039;compound fertilizer&#039;&#039; with the three macronutrients N, P and K in easily dissolved form.</div>

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