Black Liquor Testing

SKU: C-807Duration: 29 Minutes Certificate Included

Pay-per-view (PPV) format perfect for individual users.

Get immediate access to this interactive eLearning course online. Must be used within 30 days, expires 48 hours after launch.

Great for in-person classroom training or as an alternative to DVD.

Includes printable documents and Convergence Video Player for Windows systems. Content expires after 1 year.

Ideal for corporate licensing and volume users who also need administrative tracking and reporting on training.

Get this interactive eLearning course into your LMS or learn how you can leverage our LMS to deliver training to your workforce.

Need multiple courses or have lots of users? Just let us know a little more about what you need and we’ll get you some great volume pricing.

 Need help deciding? Compare delivery formats.

Course Details

Specs

Training Time: 29 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English

Several properties of black liquor - including residual alkali, temperature, and solids content - are regularly monitored in order to monitor pulping, washing, and evaporation processes at kraft pulp mills. Residual alkali is monitored during cooking to ensure that sufficient residual alkali is present and prevent lignin redeposition. Weak black liquor, strong black liquor, and heavy black liquor solids are observed to monitor washer, evaporator, and concentrator performance, and ensure consistent solids contents to the evaporators and recovery boiler. Other analyses, including heating value, elemental, inorganic, and organic analyses, are used for research, design, and troubleshooting purposes.

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

  • Describe the basic stages and flow path of black liquor in the kraft pulping liquor cycle
  • List the typical components of black liquor
  • Describe what happens to the inorganic compounds, organic compounds, and water in heavy black liquor in a recovery boiler
  • Define "viscosity," "density," "specific heat," "thermal conductivity" and "boiling point rise"
  • Describe the importance of black liquor solids testing and monitoring
  • Recognize how more advanced analyses - including heating value, elemental, inorganic, and organic analyses - are used for research, design, and troubleshooting purposes

The following key questions are answered in this module:

What is in black liquor at a kraft pulp mill?
Black liquor contains inorganic cooking chemicals, dissolved organic compounds from wood, and a small amount of fibers and fiber fines in a large amount of water.

Why are concentrators often positioned downstream of multiple effect evaporators?
Concentrators are sometimes used to further concentrate black liquor, as traditional evaporators cannot handle such viscous liquids. Some newer evaporator installations are able to produce high enough black liquor solids content for burning without a separate final evaporation step.

Why is the residual alkali content of the black liquor monitored after cooking?
To ensure that sufficient residual alkali is present. If it is too low (indicated by a pH below 12), some of the dissolved lignin can redeposit on the fibers. Low pH can also lead to scaling problems and lignin precipitation in the evaporators.

Why would someone bother to measure the solids content of the weak black liquor coming off the brown stock washers?
Weak black liquor solids are typically used to monitor the efficiency and effectiveness of the brown stock washing process.

Why is it mandatory to monitor the black liquor solids of the liquor being burned at the recovery boiler?
Black liquor solids are monitored at the recovery boiler for safety reasons. If the solids were to fall too low, and water were to reach the smelt bed, a severe explosion could result.

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

It is important to always sample from the same locations and to follow a standardized sampling, and testing procedure. Weak black liquor should be sampled on the line from the washers that goes to the evaporators. Strong black liquor should be sampled on the line exiting the last evaporator effect. Heavy black liquor should be sampled on the line exiting the concentrator. And at the recovery boiler, the heavy black liquor should be sampled either on the liquor line to the recovery boiler or on the liquor header itself.

Use the additional resources and links below to learn more about this topic:

Customer Q&A

Ask a Question

Sorry, we're missing some information

How do I log in to watch a video that I have already paid for?

Easy! Moments after you purchase your pay-per-view (PPV) course, you'll receive an email with login details. Just click the link and log in with your user name and password and you're on your way!

I would like to have some of my employees take 5 of your driving related courses, how can i set this up?

We're in the process of making bulk purchases and purchases for multiple users easier. But for now, you can order multiple courses and just let us know who you'd like to assign courses to. With an email for each user, we can set up their training plans and make sure everyone gets the eLearning assignments they need.

How can I get your paper-making courses for free?

Well, we can't blame you for asking... And while we're a for-profit company, there are situations with students and certain educational organizations where we can help out with a selection of eLearning. However, our online courses are extremely economical. And our paper industry courses are in very high demand. So, without knowing more about your situation, we think you'll get loads of value from the $39 you'll spend on any of our premium courses.

Do you have eLearning in Portuguese?

Yes, we do! And in addition to primary English narration, we produce many courses in a growing number of languages, including Spanish, Chinese, Dutch, German, Italian, Japanese, Korean, Polish, Russian, Tamil, and Thai.

I'm unemployed, but I really like your eLearning. Do I get a certificate when I complete a course?

Yes! All of our courses allow you to print a completion certficate upon successfully passing the integrated test at the end of eLearning. In the future, we'll have badges for you to use in your LinkedIn profiles.
Added to Cart! Click here to view your cart.