| 摘要 |
PURPOSE:To recover sodium, calcium and iron components by feeding powder contg. CaCO3 and iron oxide as principal components to the waste liquor burning section of a recovery boiler, forming calcium ferrate by calcination, and introducing it into a soda dissolving vessel under the boiler together with smelted matter by means of pressurized gas fed to the bottom of the boiler. CONSTITUTION:Waste liquor from a pulp manufacturing stage is blown into a recovery boiler 10 as a mist from burners 12, heated air is fed from air feeding pipes 13, 14, and the waste liquor is burned to produce smelted matter. At the same time, powder contg. CaCO3 and iron oxide as principal components is fed to the waste liquor burning section of the boiler 10 from feeding inlets 15, and calcium ferrate is formed by calcination. The smelted matter and the calcium ferrate flow downward in a soda dissolving vessel 16 under the boiler 10 along the bottom wall 22 of the boiler, yet part of them deposits on the wall 22. The deposit is dropped by feeding pressurized gas from a feeder 24 to the bottom of the boiler. The smelted matter and the calcium ferrate dissolve in water from a feeding pipe 17 and cause a reaction, and sodium, calcium and iron components are recovered.
|
