求翻译：Thermal processing, such as melting, sintering and calcination, is well established for the treatment of fly ash. But since是什么意思？

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Thermal processing, such as melting, sintering and calcination, is well established for the treatment of fly ash. But since

问题补充：

匿名	2013-05-23 12:21:38 热加工，如熔炼，烧结和焙烧，被确立为粉煤灰的处理。但由于

匿名	2013-05-23 12:23:18 热加工,如熔化、烧结和锻烧、完善、且治疗的飞灰。但自

匿名	2013-05-23 12:24:58

匿名	2013-05-23 12:26:38 处理，如熔炼

匿名	2013-05-23 12:28:18

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