暗色：石墨灰砖瓦的表面被抛光，用以提高该材料的固有特性。
Dark monochromatism: the surface of the graphite gray tiles was polished so as to enhance the intrinsic qualities of the material.
结果表明，HF酸对高硅低钙含量的煤和石墨有显著的脱灰效果；
The results showed that HF acid has remarkable deashing capacity for coal and graphite with high Si and low Ca content.
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.
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