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Kaolin reduction PTMS magnetic separator the most commonly used agent for iron removal process
published date: 2023/7/27

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The most commonly used agent for iron removal is sodium disulfite, also known as insurance powder in industry. Its molecular formula is Na2S2O4, which is a strong reducing agent. The oxide of trivalent iron present in kaolin is insoluble in water and insoluble in dilute acid. The trivalent iron in iron oxide can be reduced to bivalent iron.

PTMS magnetic separation


Since iron is soluble in water, it can be removed by filtration, washing, PTMS magnetic separator. The main reactions of this process are as follows:
Fe2O3+Na2SO4+H2S2O4=Na2SO4+2FeSO3+H2O
The effect of acidity: The reduction of iron oxide by insurance powder should not be carried out under alkaline conditions. However, the pH value of the bleaching reaction should not be too low, otherwise the stability of the insurance powder will decrease and the decomposition reaction will occur. The test shows that when pH=0.8, as long as 2min at room temperature, half of the insurance powder will be decomposed.

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Effect of temperature: As with most chemical reactions, the reaction of iron oxide with the increase of temperature is accelerated, but the stability of the powder is greatly decreased with the increase of temperature. When other conditions are well controlled in the actual production of PTMS magnetic separator, bleaching at room temperature can also achieve better results.
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