Improved APMP pulping method
A pulping and refining technology, which is applied in pulp beating/refining method, pulping with inorganic alkali, textile and papermaking, etc. Low problems, to achieve the effect of reducing production costs, high strength, and improving quality
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Embodiment 1
[0015] 1) Washing of wood chips: take wood chips with a length of 15-20 mm, a thickness of 3-5 mm, and a width of less than 10 mm, and wash with water to remove sediment;
[0016] 2) Pre-steaming: pre-steaming the washed wood chips at 90°C for 10 minutes;
[0017] 3) Extrusion and impregnation: Extrude the pre-steamed wood chips with an extrusion screw machine of 1:2.8-4.0 and then impregnate them in DTPA or EDTA at 50°C for heavy metal chelation; after chelation, they can be reused for 1 : 2.8~4.0 extruding screw machine carries out extruding, after extruding, add the alkaline H that the pH value of 2% of wood chip quality is 10 2 o 2 , react at 60°C for 50 minutes to obtain a slurry;
[0018] 4) Refining: the above-mentioned obtained slurry is subjected to one-stage refining at a mass concentration of 35%, and the freeness of the pulp after refining is controlled at 700-750ml; after refining, add 5% H of wood chip quality. 2 o 2 Bleaching is carried out for 60-90 minutes...
Embodiment 2
[0022] 1) Washing of wood chips: take wood chips with a length of 15-20 mm, a thickness of 3-5 mm, and a width of less than 10 mm, and wash with water to remove sediment;
[0023] 2) Pre-steaming: pre-steaming the washed wood chips at 85°C for 15 minutes;
[0024] 3) Extrusion and impregnation: Extrude the pre-steamed wood chips with an extrusion screw machine of 1:2.8-4.0, and then impregnate them in DTPA or EDTA for heavy metal chelation at 40°C; after chelation, they can be used for 1 : 2.8~4.0 extruding screw machine is extruded, after extruding, add the alkaline H of 1.8% of wood chip quality pH value to be 11 2 o 2 , react at 40°C for 70 minutes to obtain a slurry;
[0025] 4) Refining: the above-mentioned obtained slurry is subjected to one-stage refining at a mass concentration of 40%, and the freeness of the pulp after refining is controlled at 700-750ml; after refining, add 4% H of wood chip quality. 2 o 2 Bleaching is carried out for 60-90 minutes. After bleachi...
Embodiment 3
[0029] 1) Washing of wood chips: take wood chips with a length of 15-20 mm, a thickness of 3-5 mm, and a width of less than 10 mm, and wash with water to remove sediment;
[0030] 2) Pre-steaming: pre-steaming the washed wood chips at 80°C for 20 minutes;
[0031] 3) Extrusion and impregnation: Extrude the pre-steamed wood chips with an extrusion screw machine of 1:2.8-4.0 and then impregnate them in DTPA or EDTA for heavy metal chelation at 60°C; after chelation, they can be reused for 1 : 2.8~4.0 extruding screw machine is extruded, after extruding, add the alkaline H of 1.5% of wood chip quality pH value to be 12 2 o 2 , and reacted at 50°C for 60 minutes to obtain a slurry;
[0032]4) Refining: the above-mentioned obtained slurry is subjected to one-stage refining at a mass concentration of 45%, and the freeness of the pulp after refining is controlled at 700 to 750ml; after refining, add 4.5% H of wood chip quality. 2 o 2 Carry out bleaching for 60-90 minutes. After b...
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