Alkali Precipitation Properties of Magnesium Lignosulfonate Isolated from Acid Sulfite Pulping Waste Liquor

Abstract:

To establish a simple method to separate and purify the magnesium lignosulfonate from the red liquor, the properties of the alkali precipitation of magnesium lignosulfonate in the red liquor were investigated. The results show that the magnesium lignosulfonate could be precipitated by alkali from red liquor. The maximum amount of precipitation occurs when pH value was 13. The precipitation of the red liquor of acid magnesium sulfite is caused by magnesium. It was different from sodium lignosulfonate of the red liquor of acid sodium sulfite. The repeated alkaline precipitation after acid soluble method could be isolated and purified lignosulfonate magnesium effectively at some extent.

• Periodical: Applied Mechanics and Materials (Volumes 522-524)
• Pages: 416-419
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.522-524.416
• Online since: February 2014
• Authors: Xiao Meng Kou, Rui Feng Yang, Jie Lu*, Yan Jun Liu
• Keywords: Acid Sulfite Pulping Waste Liquor, Alkaline Precipitation, Magnesium Lignosulfonate, Red Liquor

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