Product intruduction: The sodium lignophonate,which is prepared from alkaline plugging black liquor through filtreation,sulfonate ,concentration and spray drying and is a powder low filtration,sulfonation,concentration and spray drying and is a powder low air-entrained set retarding and water reducing admixture,belongs to an anionic surface active substance,has absorption and dispersion effect on the cement and can improve various physical properties of the concrete. Product indicators: Sodium lignosulphonate appearanceClaybank powder Lignin content45%-60% Ph value9-10 moisture=2.97% Reducing substance=4% Water insolubles=3.01% Air content=3.5% Water-reducing rate9%