Method for pulping through needlebush pre-conditioning refiner chemical alkaline peroxide mechanical pulp (P-RC APMP)
A coniferous wood and pulping technology is applied in the field of pulping and papermaking to achieve the effects of reducing resin barriers, improving pulp whiteness, and reducing pulp resin content
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Embodiment 1
[0020] The conventional chemical pretreatment conditions for P-RC APMP pulping of Simao pine are: the dosage of sodium hydroxide is 2.5%, the dosage of hydrogen peroxide is 2.3%, the dosage of sodium silicate is 2%, the dosage of magnesium sulfate is 0.05%, and the dosage of ethylenediaminetetraacetic acid is 0.05%. The dosage is 0.2%, the temperature is 70°C, the liquid ratio is 1:4, and the time is 50 min. After the treatment, the second-stage extrusion is carried out, and the second-stage chemical treatment is carried out by the second-stage extrusion. The processing conditions are: the amount of sodium hydroxide is 3.5%, the amount of hydrogen peroxide is 3.3%, the amount of sodium silicate is 3%, and the amount of magnesium sulfate is 0.05%. , the dosage of ethylenediaminetetraacetic acid is 0.3%, the temperature is 65°C, the liquid ratio is 1:4, and the time is 23 min. After the treatment, a stage of refining was carried out, and after the stage of refining, a high-consi...
Embodiment 2
[0023] The chemical pretreatment conditions of conventional taeda pine P-RC APMP pulping are: the chemical treatment conditions of the first stage are sodium hydroxide dosage 2.5%, hydrogen peroxide dosage 2.7%, sodium silicate dosage 3%, magnesium sulfate dosage 0.05%, ethylenediamine The dosage of tetraacetic acid is 0.2%, the temperature is 50°C, the liquid ratio is 1:4, and the time is 55 min. After the treatment, the second-stage extrusion is carried out, and the second-stage chemical treatment is carried out by the second-stage extrusion. The processing conditions are: the amount of sodium hydroxide is 2.0%, the amount of hydrogen peroxide is 2.2%, the amount of sodium silicate is 3%, and the amount of magnesium sulfate is 0.05%. , the dosage of ethylenediaminetetraacetic acid is 0.3%, the temperature is 55℃, the liquid ratio is 1:4, and the time is 75 min. After the treatment, a stage of refining was carried out, and after the stage of refining, a high-consistency dwell...
Embodiment 3
[0026] The chemical pretreatment conditions of conventional fir P-RC APMP pulping are as follows: the chemical treatment conditions of the first stage are the dosage of sodium hydroxide 3.0%, the dosage of hydrogen peroxide 2.8%, the dosage of sodium silicate 2%, the dosage of magnesium sulfate 0.05%, the dosage of ethylenediaminetetra The dosage of acetic acid is 0.2%, the temperature is 75°C, the liquid ratio is 1:4, and the time is 45 min. After the treatment, the second-stage extrusion is carried out, and the second-stage chemical treatment is carried out by the second-stage extrusion. The processing conditions are: the amount of sodium hydroxide is 4.0%, the amount of hydrogen peroxide is 3.8%, the amount of sodium silicate is 3%, and the amount of magnesium sulfate is 0.05%. , the dosage of ethylenediaminetetraacetic acid is 0.3%, the temperature is 70°C, the liquid ratio is 1:4, and the time is 30 min. After the treatment, a stage of refining was carried out, and after ...
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