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| Number | Title | Issue Date |
| 6029588 | Closed cycle waste combustion Non-hazardous organic waste material is introduced into a slagging combustor where it is burned. The burning produces exhaust gases and a slag of molten, inorganic ash which is removed from the combustor. The exhaust gases are treated to cool and dry the ... | 02/29/2000 |
| 5549059 | Converting paper mill sludge or the like Paper mill sludge or similar organic sludges with a high ash content are converted by burning the sludge in a cyclone furnace along with another source of fuel. The heat content of the sludge is recovered and the ash content of the sludge is converted to ... | 08/27/1996 |
