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Schematic diagram of the formation of CH precipitates in two forms of lignin-calcium complexes and the adsorption of lignin onto CH particles during CH treatment process. (A) means that the adsorption of lignin onto undissolved CH particles mainly occurs during CH treatment process due to most of Ca(OH)2 existing in solid form in PHL. (B) means lignin-calcium complexes between lignin and calcium ions were limited to form based on the lower solubility of Ca(OH)2 in PHL.
