Demetalization of SS by a modified BCR sequential extraction before liquefaction.
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Demetalization had little effect on oil quantity, but had positive effect on quality.
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Bio-oil and bio-char produced after demetalization pose low environmental risk.
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Removal of F1 and F2 fractions of heavy metals before liquefaction is recommended.
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The expansion of BCR can be widely used to study the heavy metal in other processes.
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