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<p>Importing a new version from external source</p> <p><b>New page</b></p><div>Step 2. Removal of Calcium Nitrate. It is important to remove the [[calcium nitrate]] because calcium nitrate is extremely [[Hygroscopy|hygroscopic]]. <br /> *Method 1.(Odda process) Calcium nitrate crystals are removed by centrifugation. <br /> *Method 2. Sulfonitric Process Ca(NO&lt;sub&gt;3&lt;/sub&gt;)&lt;sub&gt;2&lt;/sub&gt; + H&lt;sub&gt;2&lt;/sub&gt;SO&lt;sub&gt;4&lt;/sub&gt; + 2NH&lt;sub&gt;3&lt;/sub&gt; → CaSO&lt;sub&gt;4&lt;/sub&gt; + 2NH&lt;sub&gt;4&lt;/sub&gt;NO&lt;sub&gt;3&lt;/sub&gt;<br /> *Method 3.Phosphonitric Process Ca(NO&lt;sub&gt;3&lt;/sub&gt;)&lt;sub&gt;2&lt;/sub&gt; + H&lt;sub&gt;3&lt;/sub&gt;PO&lt;sub&gt;4&lt;/sub&gt; + 2NH&lt;sub&gt;3&lt;/sub&gt; → CaHPO&lt;sub&gt;4&lt;/sub&gt; + 2NH&lt;sub&gt;4&lt;/sub&gt;NO&lt;sub&gt;3&lt;/sub&gt;<br /> *Method 4.Carbonitric Process Ca(NO&lt;sub&gt;3&lt;/sub&gt;)&lt;sub&gt;2&lt;/sub&gt; + CO&lt;sub&gt;2&lt;/sub&gt; + H&lt;sub&gt;2&lt;/sub&gt;O + 2NH&lt;sub&gt;3&lt;/sub&gt; → CaCO&lt;sub&gt;3&lt;/sub&gt; + 2NH&lt;sub&gt;4&lt;/sub&gt;NO&lt;sub&gt;3&lt;/sub&gt;</div>

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