Method for co-producing molded food-container pulp and fulvic acid from cotton stalk

A method for co-producing molded food-container pulp and fulvic acid from cotton stalk, comprising:

• step 1, pulping, comprising:
• digesting a cotton stalk raw material to hydrolyze hemicellulose and pectin and retain part of lignin to obtain a pulp;
• defibering the pulp by a first refiner having a consistency of 25 to 35% and separating to obtain a coarse pulp and a pulping black liquor;
• defibering the coarse pulp by a second refiner having a consistency of 3 to 6% to expose residual hemicellulose and residual pectin to obtain a semi-finished pulp;
• bio-treating the semi-finished pulp to remove residual hemicellulose and residual pectin, and to remove anionic waste to obtain a finished pulp;
• wherein, digesting the cotton stalk raw material by adopting an ammonium sulfite method;
• and a by-product of the digesting process is fulvic acid;
• wherein, fulvic acid is also obtained as a by-product while obtaining the finished pulp with a low beating degree of 22-28° SR for molded food-container that removes anionic waste and retains some lignin;
• step 2:
• pulp proportioning, comprising:
• mixing of the finished pulp with the low beating degree for molded food container and a straw chemical pulp having a high beating degree of 35-45° SR to adjust the pulp to reduce the beating degree and increase the water filtration.