Method for APMP (Alkaline Peroxide Mechanical Pulp) pulping of needlebush
A technology for coniferous wood and pulping, which is applied in the directions of pulping with inorganic alkali, pulping with organic solvents, pulping with cellulose raw materials, etc., to achieve the effects of reducing content, reducing energy consumption for refining and improving pulp whiteness
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Embodiment 1
[0019] The chemical pretreatment conditions for conventional larch APMP pulping are as follows: the dosage of sodium hydroxide in the first stage of chemical treatment is 1.8%, the dosage of hydrogen peroxide is 2.0%, the dosage of sodium silicate is 3%, the dosage of magnesium sulfate is 0.05%, and the dosage of ethylenediaminetetraacetic acid is 0.2%. , temperature 55°C, liquid ratio 1:4, time 60 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 2.5%, the amount of hydrogen peroxide is 2.7%, 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 60°C, the liquid ratio is 1:4, and the time is 75min. Under the treatment process conditions, the beating degree of pulp obtained is 52.2 O SR, the energy consump...
Embodiment 2
[0022] The chemical pretreatment conditions for conventional taeda pine APMP pulping are: the first stage of chemical treatment conditions is 2.5% sodium hydroxide, 2.7% hydrogen peroxide, 3% sodium silicate, 0.05% magnesium sulfate, and ethylenediaminetetraacetic acid. 0.2%, temperature 50°C, liquid ratio 1:4, time 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. Under the treatment process conditions, the beating degree of pulp obtained is 48.6 O SR, the refining energy consumption is 1572 kW·h / t pulp, the brightness is 56.8%ISO, and the bulk is 2....
Embodiment 3
[0025] The chemical pretreatment conditions for conventional fir APMP pulping are as follows: the chemical treatment conditions of the first stage are the dosage of sodium hydroxide 1.5%, the dosage of hydrogen peroxide 1.7%, the dosage of sodium silicate 3%, the dosage of magnesium sulfate 0.05%, the dosage of ethylenediaminetetraacetic acid 0.2 %, temperature 60°C, liquid ratio 1:4, time 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 3.6%, 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 50 min. Under the treatment process conditions, the beating degree of pulp obtained is 45.4O SR, the energy consumption of...
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