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Language: English French Polish Portuguese Russian
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Recaust Series (Details)Includes 12 courses for $499/year. Pulping Library (Details)Includes 72 courses for $1,499/year.
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Training Time: 21 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, Portuguese, French, Polish, Russian
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. This course starts with an overview of the kraft pulping process and recausticizing system, and then describes how they fit together. It describes the major equipment and steps or processes found in the recaust system, including the liquid and solids flows into and out of the system. Lastly, it details the important chemical reactions that take place - slaking, causticizing, and calcining.
Black Liquor Evaporators - Equipment
View Course
Continuous Cooking Introduction
Green Liquor Clarifiers
Lime Kiln Fundamentals
White Liquor Clarifiers
The following key questions are answered in this module:
What is the source of green liquor?Green liquor is created from spent inorganic cooking chemicals in the recovery boiler, or smelt, that is combined with ""weak wash"" in the dissolving tank under the recovery boiler.
What is slaking?Slaking is the reaction that occurs when solid lime, or calcium oxide is added to water, creating calcium hydroxide.
What is causticizing?Causticizing is a reaction in which sodium carbonate in green liquor reacts with calcium hydroxide from the slaker to form sodium hydroxide and calcium carbonate.
What is calcining?Causticizing is a reaction in which sodium carbonate reacts with oxygen to form calcium oxide, or lime.
What are grits?Grits are insoluble compounds, most of which come from purchased lime, which collect in the slaker and need to be removed and disposed of.
Below is a transcript of the video sample provided for this module:
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