| 摘要 |
Process for foaming mineral particles (pellets), in particular fly ash, mixed with foaming agents by heating to foaming temperature and discharging from the furnace used for foaming, with the particles being kept suspended by a stream of the combustion air of the gas used for combustion and of the combustion gases until sufficient foaming has been achieved, and the particles moving towards the discharge opening of the furnace used during this period of time. <IMAGE>
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