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<p>to give elemental <a href="page.php?w=phosphorus">phosphorus</a>. This process is also known as the thermal process or the electric furnace process. Silica is also added, resulting in the production of <a href="page.php?w=calcium_silicate">calcium silicate</a> slag. Elemental phosphorus is distilled out of the furnace and burned with air to produce high-purity <a href="page.php?w=phosphorus_pentoxide">phosphorus pentoxide</a>, which is dissolved in water to make phosphoric acid. The thermal process produces phosphoric acid with a very high concentration</p><p>
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