Lignosulfonate Production Plant

Lignosulfonate Production

From spent pulping liquor to dry, free-flowing lignosulfonate powder.

These 2026 photos show a lignosulfonate production plant: the evaporation section, spray drying towers and the air-handling equipment that turns liquid feedstock into consistent powder grades.

How Lignosulfonate Is Made

The main stages between raw liquor and packed product.

FeedstockSpent sulfite pulping liquor is collected and screened before processing.
EvaporationMulti-effect evaporators concentrate the liquor to the required solids content.
Spray DryingThe concentrate is atomized in spray towers to form fine, uniform powder.
Testing & PackingEach batch is tested in the laboratory, then packed and labeled.

Inside the Plant

Equipment grouped by process stage.

Stage 1

Liquor Handling & Process Area

Spent pulping liquor is held and mixed in tanks under covered process areas before it is pumped to evaporation.

Tower stairway and jumbo bags beside the drying building — Tower stairway and jumbo bags

Covered process area and drying building at a lignosulfonate plant — Covered process area

Process area with tank agitator drive at a lignosulfonate plant — Process area and agitator drive

Stage 2–3

Evaporation & Spray Towers

Concentrated liquor is fed from the evaporation section to the spray towers, where it is dried into powder.

Spray dryer chamber for lignosulfonate powder — Spray dryer chamber

Lignosulfonate production plant: evaporator and spray tower — Evaporation section and spray tower

Spray drying tower structure at a lignosulfonate plant — Spray drying tower structure

Stage 3

Drying Section & Air Handling

Cyclones, ducting and exhaust treatment recover product and clean the drying air before release.

Lignosulfonate drying tower and exhaust stack — Drying tower and exhaust stack

Cyclone and ducting in the lignosulfonate drying section — Cyclone and ducting

Dryer exhaust treatment at a lignosulfonate plant — Dryer exhaust treatment unit

Exterior of the lignosulfonate drying section — Drying section exterior

Stage 4

Quality Testing

Samples are checked for solids and moisture content during production. Each batch is tested in the laboratory, and results are stated on the COA.

Solids content test of a lignosulfonate sample on a moisture analyzer — Solids content test

Liquid lignosulfonate sample on a moisture analyzer — Liquid sample check

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