Processing technique for residual papermaking black liquor
A technology for papermaking black liquor and processing technology, applied in papermaking, textile and papermaking, fiber raw material processing, etc., can solve problems such as damage to water bodies, farmland, fish ponds, hidden dangers of environmental pollution, and spillage of black liquor in ponds, and achieve remarkable treatment effects. , Simple operation and management, reasonable processing cost
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[0012] Such as figure 1 As shown, the present invention processes papermaking black liquor containing lignin and polysaccharides, and it processes it according to the following steps:
[0013] 1) Oxidation reaction; add sulfuric acid, ferrous sulfate and hydrogen peroxide to the treated papermaking black liquor to adjust the pH value of the papermaking black liquor to 4~5; then, input the mixed black liquor with the pH value of 4~5 The first-level sedimentation pond, stand for 12-16 hours to settle, obtain the light yellow supernatant and the first-grade sludge, and the first-grade sludge is discharged into the drying field; the sulfuric acid concentration is 98%, and the black liquor is pressed at 5.0~6.5Kg / m 3 Proportional dosing; ferrous sulfate is in powder form, and it is 7.0~8.0Kg / m with black liquor 3 Proportional dosing; the concentration of hydrogen peroxide is 30%, and the black liquor is 3.0~4.0Kg / m 3 Proportional dosing
[0014] 2) Neutralization and coagulation: inpu...
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