PTMS magnetic separator provides a multi-step iron removal and whitening method for low-grade kaolin
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Low grade kaolin can be whitened after chemical bleaching, but the whitening effect is limited, it is difficult to achieve the quality of high grade kaolin, and it is difficult to replace high grade kaolin. PTMS magnetic separator provides a multi-step iron removal and whitening method for low grade kaolin to achieve high efficiency whitening of low grade kaolin and achieve high grade kaolin quality.
PTMS magnetic separation
Take kaolin raw materials and appropriate amount of dispersant and add water to prepare a slurry with kaolin content of 40wt %, stir fully, and obtain a thin slurry with kaolin content of 5wt %; The dispersant was sodium hexametaphosphate and the added amount was 5mg/l. Step 2: Add urea sulfur dioxide to the thin slurry of step 1, and adjust the ph of the slurry to 7.5; The stirring time was 120min and the reaction temperature was 40℃.
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The amount of urea SO2 was 1% of the mass of kaolin. Step 3: Adjust the ph of the slurry prepared in step 2 to 1.5, add oxalic acid of 1% of the mass of kaolin sample, and stir for 120min at a reaction temperature of 40℃. After filtration, washing and drying at 105 ° C, the brightened kaolin product is obtained.
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