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Language: English Portuguese
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Training Time: 14 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, Portuguese
During the conversion of green liquor to white liquor in the slaker and causticizers, lime mud is formed. The mud is separated from the white liquor and sent to mud storage. Before the lime mud can be fed into the kiln, it must be washed to remove residual chemicals, and dewatered to remove as much water as possible. This module describes the most common method of lime mud filtering and the components and operation of the lime mud filter.
Green Liquor Clarifiers
View Course
Lime Kiln Fundamentals
Lime Mud Washers
Recausticizing Fundamentals
White Liquor Clarifiers
The following key questions are answered in this module:
What is the purpose of the lime mud filter?The purpose of the lime mud filter is wash residual cooking chemicals from the lime mud and to dewater it as much as possible.
What is recausticizing?Recausticizing is the process of converting the chemicals in the spent cooking liquor back to their original form so that they can be re-used in the kraft pulping process.
What is the purpose of the precoat layer on a lime mud filter?The precoat layer provides a layer of filtration media which allow the fresh mud to be washed and dewatered while minimizing plugging of the filter screen by the finest particles in the mud.
What are two methods for renewing the precoat layer on a lime mud filter?The precoat layer can be continuously renewed through the use of continuous precoat renewal, where a moving strip of precoat is continously removed and rebuilt, or by a traveling doctor blade which removes a thin layer across the entire drum.
How is calcium buildup on a lime mud filter dealt with?In order to combat calcium buildup on the wire of a lime mud filter, the cake is dropped off the drum, the vat is drained, and an acid wash is applied to the wire.
Below is a transcript of the video sample provided for this module:
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