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WhatsApp: +86 18203695377WEBNov 15, 2023 · Introduction. Coal gangue covers sulfur elements and heavy metal elements (, Pb, Cr, and Hg) [1]. If coal gangue is mixed with coal and burned together, the utilization rate of raw coal will be reduced, and toxic gases (, CO, SO 2, and H 2 S) will be released, thus seriously jeopardizing human health and the ecological environment .
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