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Training Time: 20 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English
Green liquor is created when smelt from the recovery boiler is mixed with weak wash in the dissolving tank. Any un-dissolved particulate material in the green liquor is termed "dregs". The failure to remove these foreign materials from the green liquor can lead to many difficulties in downstream lime mud washing. This module describes the composition of dregs, the need for washing of dregs, and identifies and describes the typical equipment used for washing dregs.
At the end of this module, you will be able to:
The following key questions are answered in this module:
In the recausticizing process, what are ""dregs""?Dregs are the undissolved particulate material in green liquor.
Why do dregs need to be removed from green liquor?If left in the liquor, dregs would negatively affect downstream processes, including interferring with lime mud washing, increasing lime kiln energy consumption and increasing the recovery cycle dead load.
Why are dregs washed?Separated dregs still contain cooking chemical, there is an economic value seen from recovering that chemical.
Why do dregs washers typically use a precoat?Dregs particles are very small and quickly clog filter screens. By putting a precoat on a filter and continuously removing it, higher rates of filtration and washing can be maintained.
What are alternatives to washing dregs on a drum washer?Dregs can be washed in a clarifier then dewatered, washed on a belt washer, or washed in a chamber filter press.
Below is a transcript of the video sample provided for this module:
Electrostatic Precipitators
View Course
Green Liquor Clarifiers
Lime Mud Filtering
Recausticizing Fundamentals
White Liquor Clarifiers
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