Chemical Recovery Plant
Descriptions：
The alkali recovery system is designed to reclaim chemicals and energy from the black liquor generated in the alkaline pulping process. Modern wood pulp recovery efficiency typically ranges from 95% to 98%, while straw pulp mills achieve recovery efficiencies of approximately 85% to 90%. This plays a crucial role in the sustainable development of the paper industry.
The main steps in the alkali recovery process include: concentrating black liquor in multi-effect evaporators to form strong black liquor; oxidizing and removing silica from the black liquor; further concentrating the black liquor to meet the requirements of the recovery boiler; incinerating the black liquor in the recovery boiler; dissolving the molten material from the recovery boiler to form green liquor; causticizing green liquor with lime to produce white liquor; and calcining white mud to recover lime.
The primary contributions of alkali recovery systems to the pulping industry are significant energy savings and reduced pollution.
Key words:
Chemical Recovery Plant
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