In normal coal samples, quartz and other minerals are found only in trace amounts.
2
结果表明，含氟酸是良好的煤和石墨的脱灰剂，能有效地脱除煤和石墨中的各种矿物质组分。
The results showed that fluorine-bearing acids are good deashiag agent of coal and graphite and can effectively leach out almost all mineral components in coal and graphite.
3
煤中无机矿物质是煤的重要组成部分，对高浓度煤浆制备、煤浆性质产生重要影响。
Mineral matters as a component of coal are of great importance for the preparation of highly loaded coal water slurry fuel and regulating slurry properties.
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