| 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, introducing most of the calcium ferrate into a soda dissolving vessel together with smelted matter, and introducing part of it captured in a flue into the vessel. 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. Part of the calcium ferrate is captured with a dust collector 22 connected to a flue 11, and it is introduced into a soda dissolving vessel 16 from a feeding inlet 23. Most of the calcium ferrate is introduced into the vessel 16 together with the smelted matter flowing downward along the wall of the boiler. In the vessel 16, they dissolve in water from a feeding pipe 17 and cause a reaction, and sodium, calcium and iron components are recovered.
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