Method for producing high-purity trimanganese tetraoxide and high-purity trimanganese tetraoxide produced by the method
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United States of America Patent
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May 30, 2017
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May 7, 2015
app pub date -
Apr 30, 2013
filing date -
Apr 30, 2012
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Abstract
A method for producing high-purity trimanganese tetraoxide from dust containing manganese includes adding sulfuric acid (H2SO4) and a reductant to manganese dust and leaching manganese therefrom; eliminating primary impurities by adding calcium hydroxide (Ca(OH)2)) to the leached manganese solution acquired from the leaching step; eliminating secondary impurities by adding sulfides to the leached manganese solution from which primary impurities have been eliminated; precipitating manganese by using sodium hydroxide (NaOH) so as to control the pH in the leached manganese solution from which secondary impurities have been eliminated, and cleaning and drying the precipitated specimen; and acquiring high-purity trimanganese tetraoxide by injecting the dried specimen with air and heat-treating same under oxidizing conditions. Thus the present invention allows high-purity trimanganese tetraoxide to be produced from dust containing manganese, for use as material for a secondary battery.
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