Tag: calcium lignosulfonate

calcium lignosulfonate

Calcium lignosulfonate uses in concrete

Calcium lignosulfonate in concrete action and dosage – Stone Refractories I. Calcium lignosulfonate water reduction in concrete reinforced role Calcium lignosulfonate and sodium lignosulfonate reducing agent is a surface-active agent, added to the concrete, due to the orientation of hydrophobic groups adsorbed on the surface of cement particles, so that the cement with a negative […]

Calcium lignosulfonate Properties

Calcium lignosulfonate (referred wood calcium) is a multi-component polymer anionic surfactant, the appearance of brown powdery substance, slight aroma, molecular weight is generally 800 to 10000, with a strong dispersion, bonding, chelation. Currently calcium lignosulfonate products have been widely used as a cement water reducing agent, pesticide suspensions, ceramic body enhancers, CWS dispersants, leather tanning […]

Calcium lignosulfonate manufacture process

Calcium lignosulfonate is obtained from soft wood processed in sulfite pulping method for producing paper. They small pieces of softwood is put into reaction tank to react with acidic calcium bisulfite solution for 5-6 hours under the temperature of 130 degree Centigrade.  During the process the bisulfite ions reacted with native lignin to for sulfonated lignin, that is lignosulfonate. Also the calcium ion stabilize the anionic lignosulfonate group. After complete reaction the insoluble cello use and soluble calcium lignosulphonate is separated by filter. After filtration the filtrate contains some lignosulfonate, bisulfite salts and reducing agent monomers. Thus will add into sulfuric acid then through evaporation to evaporate the water and sulfite like sulfur oxide. Then the filtrate will be diluted with water for further purification by ultrafiltration when the temperature is slightly going up. Ultrafiltration is liquid /liquid separation to separate the filtrate by a semi permeable membrane. Then the filtrate is added into diluted sulfuric acid to adjust PH the evaporate around 100 degree Centigrade for spray dry. calcium lignosulfonate manufacture process

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