廃白土の脱色を求む（油はどう洗うか）
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初期精製された黒色白土オイルの脱色方法（洗浄）
考えてみてください。水を加え、同時に水蒸気で加熱し、その後圧搾して白土に吸着された有機物を取り出しますが、除去率は約95％程度に過ぎません。
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