Green Liquor Clarifiers

SKU: C-655Duration: 20 Minutes

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Course Details


Training Time: 20 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English, Portuguese, French

Green liquor contains undissolved particulate material called "dregs." In order to be reused in the kraft pulping process, the green liquor must be converted back into white liquor. The first step in this process is to purify the green liquor by allowing the dregs to settle in a sedimentation clarifier. This module will provide you an understanding of the purpose, function, and operating principles of green liquor clarifiers.

Learning Objectives

At the end of this module, you will be able to:

  • Identify and describe the major components of a green liquor clarifier
  • Describe the purpose and operating principles of a green liquor clarifier
  • Identify and describe the typical process flows in a green liquor clarifier
  • Describe conditions that can cause clarifier upsets
  • Identify key safety considerations when working with a green liquor clarifier

Key Questions

The following key questions are answered in this module:

How is green liquor created?
Spent inorganic cooking chemicals from the recovery boiler, or smelt, is combined with ""weak wash"" to create green liquor.

What are dregs?
Dregs are the undissolved particulate material in green liquor.

How are dregs removed from green liquor?
Dregs are typically removed from green liquor by allowing them to settle out in green liquor clarifier.

What is the effect of polymer added to a green liquor clarifier?
Polymer added to green liquor causes small dregs particles to combine together into larger particles, leading to faster and better separation of dregs.

What is ""rise rate"" in a green liquor clarifier?
Rise rate refers to the velocity of liquor from the bottom of the clarifier to the top across the entire area of the clarifier.

Sample Video Transcript

Below is a transcript of the video sample provided for this module:

The surface of a particle causes drag on the particle as it tries to fall through the liquor. Think how a skydiver tucks his arms close to his side to reduce drag and increase his speed. Small particles have a high surface area to weight ratio. A single large particle has less surface area than a group of small particles of the same total weight, so it will fall faster. Polymer is a chemical added in small quantities to the green liquor as it enters the clarifier. The polymer causes the particles to combine into larger particles leading to a faster and better separation of drags.

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