| 摘要 |
Feeders are described for use in the foundry industry comprising (a) rice husk ash containing, based on the total amount of the components detectable in the rice husk ash by quantitative phase analysis using X-ray diffractometry (i) crystalline modifications of silicon dioxide, (ii) monoclinic feldspar, and (iii) amorphous silicon dioxide, a total fraction of at least 70% by weight, preferably greater than 75% by weight, of (i) crystalline modifications of silicon dioxide, and (ii) monoclinic feldspar, wherein, based on the total mass of the shapeable composition of the feeder, the amount of this rice husk ash is in the range from 5 to 50% by weight, preferably 5 to 25% by weight, (b) cured binder, (c) optionally fibrous material, (d) optionally one or more further fillers, and (e) optionally an oxidizable metal and an oxidizing agent for the oxidizable metal. |
