请教关于一段话的（一种生产装置）翻译
The gravimetrical plants are the ones where the hot-mix asphalt is made by heating cold ingredients (crushed stone, dust-of-rock, sand ) with direct flame in the drier, the now warm ingredients follow to the elevator and the hot dosing silos, where they are weighed and then taken to the pugmill mixer, where then it is added the cold load (“filler”) and hot asphalt, mixing everything up to twenty five seconds, maximum，being then ready the trace of the hot—mix asphalt．其中的dust-of-rock，direct flame，twenty five seconds, maximum，being then ready the trace of the hot—mix asphalt．
这几个部分怎么译呢？
多谢各位解答！
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