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Language: English Polish Portuguese
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Bleaching Series (Details)Includes 11 courses for $499/year. Pulping Library (Details)Includes 72 courses for $1,499/year.
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Training Time: 22 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, Portuguese, Polish
After wood chips are pulped, either by chemical or mechanical means, the resulting pulp has a brownish color. In order to create a white or lighter colored final product, the pulp much be bleached. This course describes the equipment used in the pulp bleaching process including pumps, mixers, reaction or retention towers, and washers.
Bleaching Basics
View Course
Chlorine Dioxide Generation
Ozone Bleaching
Peroxide Bleaching
Pulp Bleaching Environmental Considerations
The following key questions are answered in this module:
What are the major pieces of equipment need in a bleach plant and what is their purpose?A pump is needed to move the pulp. A mixer blends chemicals and steam with the pulp. A bleaching tower provides time for the bleaching reactions to occur. Finally, a washer is used to remove the chemicals and dissolved lignin from the pulp.
What type of mixers are used to mix bleaching chemicals with pulp?Some common mixer types are static, peg, dynamic, and high shear.
What are the common bleaching tower designs?Upflow, downflow, upflow-downflow, and displacement towers.
What type of washers can be used in a bleach plant?Bleach plants can use vacuum drum washers, wash presses, compaction baffle filters, and drum displacement (DD) washers.
What type of pump can be used for pumping pulp in the bleach plant? A centrifugal pump can be used for low consistency pulp and a modified centrifugal or a positive displacement pump can be used for medium consistency pulp.
Below is a transcript of the video sample provided for this module:
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