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首页> 美国政府科技报告 >REMOVAL OF MAGNESIUM IMPURITIES FROM PHOSPHATE ROCK CONCENTRATES.
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REMOVAL OF MAGNESIUM IMPURITIES FROM PHOSPHATE ROCK CONCENTRATES.

机译：从磷矿石精矿中去除镁杂质。

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Laboratory tests were conducted to study removal of magnesium impurities from western phosphate rock concentrates by selective leaching. The systems evaluated included leaching with dilute sulfuric acid,with ammonium sulfate,and in an aqueous medium with sulfur dioxide gas. Removal of magnesium was accomplished with all three systems. With dilute H2SO4the magnesium level was reduced to less than 0.1percent MgO with anaccompanying P2O5loss of 6percent. Magnesium oxide levels from 0.3to 0.2percent were obtainable with ammonium sulfate. However,the system requires concentrate roasting at temperatures of 900C or higher,heated pulps (100C),and large quantities of ammonium sulfate. Selective leaching was obtained using SO2gas in an aqueous concentrate slurry. Magnesium oxide content was reduced to less than 0.1percent without loss of phosphate. (Author)

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