Kraft Pulp and Paper Liquor Measurement
Separate liquor concentration from lime-mud density and solids duties across the kraft recovery process.
Specify the stream before the analyser
Kraft mills circulate chemically different streams, including weak black liquor, green liquor, white liquor and lime mud. Rhosonics describes CDM 9670/9680 applications for dissolved and suspended components, and reports a CDM 9670 lime-mud trial at a Canadian paper mill. The measurand, chemistry, calibration and wetted materials must therefore be selected for the particular process point; this is not a blanket SDM ECO recommendation.
Representative genuine Rhosonics 9600-family analyser image; no specific paper-mill installation is implied.
Separate the kraft measurement duties
Each stream has a different chemistry, solids load and operational purpose.
Weak black liquor
Define the concentration range and where the liquor is measured before evaporation or recovery.
Green and white liquor
Review dissolved alkali, residual solids and the specific stage in the chemical recovery cycle.
Lime mud
Distinguish slurry density and suspended solids before washing, filtration or kiln feed.
Process compatibility
Check temperature, pressure, chemistry, scaling, abrasion and wetted materials for the chosen location.
A practical measurement review pathway
Move from a broad process idea to a defined, testable duty before using the signal for decisions.
Name the stream
Map the liquor or lime-mud line and its neighbouring unit operations.
Choose the measurand
Define density, dissolved solids, suspended solids or another supported output.
Review installation
Select a representative, maintainable fitting and compatible materials.
Validate with samples
Compare the live result against laboratory evidence through the intended process range.
Where the measurement adds value
Set out both the useful signal and its limitations before specifying the instrument.
Operational value
A validated inline trend can help operators see changes between laboratory samples and provide process context for liquor recovery or lime-mud handling.
Important boundary
A CDM model or calibration suitable for one kraft stream cannot automatically be transferred to another. The published lime-mud case is from Canada and does not establish performance at a UK paper mill.
Sources and application boundary
The sources below establish the measurement context; they are not evidence of a PMA installation at your site. Final suitability depends on the actual material, operating range, installation and representative validation.
Search every application
Use the Application Finder to search process measurement guidance by material, duty or analyser. Compare duties in the chemical concentration library and review the 9600 Series analysers.
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