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The effect of reaction time on the removal of iron from PTMS magnetic separation is significant
published date: 2024/2/15

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Removal of iron powder reduction method: kaolin reduction of iron removal of the most commonly used agent is sodium bisulfite, industrial also known as insurance powder, its molecular formula is Na2S2O4, is a strong reducing agent, the presence of trivalent iron oxide in kaolin insoluble in water, also insoluble in dilute acid, but under the condition of the presence of insurance powder, the trivalent iron in iron oxide can be reduced to bivalent iron. PTMS magnetic separation can remove iron (FE2O3) from kaolin.

PTMS magnetic separation


Since iron is soluble in water, it can be removed by filtration and washing. The reaction time has great influence on the removal of iron from PTMS magnetic separation, and the ideal whiteness can not be achieved if the reaction time is too short. Too long a waste of agents, and even due to the reoxidation of iron oxide in the air, also lead to a decline in product whiteness.

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It is generally believed that the reaction time should be 40min to 2h, and the reaction should be washed and filtered immediately after completion, otherwise there will be yellowing phenomenon, that is, the reoxidation of bivalent iron, which reduces the whiteness of kaolin. Although the pulp concentration has little effect on bleaching itself, the viscosity of the pulp increases when the concentration is too high, which makes the PTMS magnetic separation reaction difficult to carry out. Generally, the pulp concentration should be controlled below 15%.
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KAOLIN PTMS magnetic separation 20240215

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