Pulp and Paper Mills: Using MgSO4 in Process Water
Magnesium in Mill Water Chemistry
MgSO4 in paper making is primarily about controlling magnesium ion concentration in process water rather than about the fibre itself. Mills use a clean divalent salt to stabilise ionic conditions in pulping, washing and certain peroxide bleaching stages.
MgSO4 Group Limited supplies industrial grades with consistent assay so a dosing setpoint stays valid between lots.
Why Industrial Magnesium Sulphate
industrial magnesium sulphate is preferred in these applications because it dissolves cleanly, contains no chloride, and is comparatively neutral in solution. Chloride is unwelcome in many mill circuits because of corrosion and effluent considerations.
It also pairs well with existing magnesium-based additives used to protect cellulose viscosity during oxygen and peroxide stages.
Process Water Magnesium Targets
process water magnesium should be set from a water analysis of the actual mill circuit, since fresh water, white water reuse and chemical recovery all contribute to the baseline. Adding magnesium without that baseline risks overshooting the intended window.
Recheck after any change in closure level, because a more closed water loop concentrates dissolved ions over time.
MgSO4 in paper making — Magnesium Sulphate Monohydrate(Kieserite) powder W.MgO20%23%25%min from MgSO4 Group Limited — view product: https://www.mgso4.com/pid18135927/Magnesium-Sulphate-Monohydrate-Kieserite-powder-W-MgO20-23-25-min.htm
Selecting a Magnesium Sulfate Supplier
A dependable magnesium sulfate supplier for a continuous mill holds assay, insolubles and particle size steady, since a dosing pump calibrated to one grade will under-feed if the next lot behaves differently.
Ask for batch-linked COAs and retained samples, which make a water-chemistry investigation traceable if a quality excursion occurs.
Role as a Pulp Mill Chemical
As a pulp mill chemical, the material is normally prepared as a clear solution and metered into the circuit. Complete dissolution matters: undissolved fines can foul strainers and distort the actual dose reaching the stock.
Fine powder suits automated make-up systems, while crystal grades are easier to handle where batches are prepared manually.
Magnesium Ion Dosing Practice
magnesium ion dosing should be validated at laboratory or pilot scale against pulp viscosity, brightness and any scaling tendency before a full circuit change. Introduce the change gradually and sample at defined points downstream.
Keep the dosing pump calibration, solution strength and flow rate in one log, so a deviation can be attributed to a specific variable.
Interaction With Other Additives
Check compatibility with chelants, caustic and peroxide in the same stream, and avoid mixing concentrated solutions where precipitation is possible. A separate make-up and injection point is usually the simplest arrangement.
Where the mill runs a magnesium-based viscosity protector, confirm the combined magnesium load rather than treating the two additions independently.
Monitoring and Effluent
Track sulphate in the effluent mass balance, especially where discharge limits apply. Online conductivity plus a periodic laboratory sulphate result keeps the dosing honest without excessive sampling.
Store the dry salt sealed and palletised; caked material makes a make-up batch unreliable and can starve the dosing line.
industrial magnesium sulphate — Magnesium Sulphate Anhydrous powder(100% water solute)
Our Industrial Support
MgSO4 Group Limited supplies heptahydrate, monohydrate and anhydrous industrial grades with declared assay, iron and particle size, backed by per-lot documentation for mill quality systems.
Share your circuit water analysis, dosing equipment and target for a grade recommendation and a trial sample.
Share your grade, quantity and destination with MgSO4 Group Limited for a specification-matched quotation and documented lead time.
