Green Liquor Clarifiers

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.

Request a demo

Course Details

Learning Objectives

• 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

Specs

Course Level Intermediate
Languages English, Portuguese, French
Compatibility Audio, Video
Based on: Industry Standards and Best Practices

Author

Vector Solutions

With over two decades of experience designing advanced 3D animated courseware and developing our proprietary learning management software, we pride ourselves by having developed over 1,000 safety and operations training modules, which have helped train over 250,000 workers worldwide. Our highly experienced team provides the industry with a simple and high-quality means of training their workforce. Whether your team consists of 25 people or an enterprise with thousands, we’re here to help.

Key Questions

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

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.

Course Applies To

Demos + Pricing

Learn more about our courses, get pricing, and see our platform.

Trusted by 24,000+ Industry Leaders