| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus for treating surplus soil from the breakup of a building or incineration ash left after wastes are incinerated, whereby the combustibles contained in the soil or the ash are removed to make the composition of the product uniform so as to be recyclable. SOLUTION: Surplus soil (usually called a mince) left after a building is broken up or incineration ash is introduced into a rotary kiln, and a high- temperature combustion gas is countercurrently blown into the kiln while the kiln is rotated. The high-temperature combustion gas burns the combustibles contained in the soil or the ash, whereas the noncombustibles, such as sand, debris, or ash, are fired by exposure to the high-temperature gas produced from the combustion. Then sand, debris, or sand fired in the kiln become combustible-free, sterilized, highly pure calcined sand (fired soil) or fired ash, which is discharged from the kiln. It is then subjected to magnetic separation to separate metals therefrom and to sieving to uniformize its grain size.
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