Application of book paper to wastepaper deinking instead of office wastepaper
A technology for deinking office waste paper and waste paper, which is applied in waste paper processing, papermaking, paper recycling, etc. It can solve the problems of low price of jammed paper, no profit margin, and large investment in equipment, so as to improve the appearance quality, The effect of reducing consumption and cost
Inactive Publication Date: 2012-06-13
中冶美利浆纸有限公司
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[0003] However, in recent years, due to the low market price of cardboard and no profit margins, in order to win the market in the downturn, it is necessary to gradually replace commercial pulp with deinked pulp to reduce production costs; the waste paper commonly used in the world The main form of the deinking process is multi-stage thermal dispersion and multi-stage flotation. The idea is to disperse part of the ink particles and stickies in the waste paper pulp, making it invisible to the naked eye. Because these processes need to use A large number of high-energy-consuming equipment, repeated reduction and increase of concentration, repeated heating and dosing, lead to serious problems such as large equipment investment, high energy consumption, high operating cost, and low slurry yield
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[0018] A kind of book paper replaces the application of office waste paper in waste paper deinking, comprises the following steps:
[0019] (1) Pulping step: Add waste paper and water into the high-consistency hydraulic pulper, the pulping concentration is 13-18%, the pulping temperature is 60-80°C, the pulping time is 15-30 minutes, and the relatively dry Slurry volume, hydrogen peroxide 1-2%, deinking agent 2-4%, caustic soda 0.3-0.7%, sodium silicate 0.5-1.2%, chelating agent 0.02-0.1%, crushing pH value 9.0-11, after crushing deinking pulp;
[0020] (2) High-concentration desanding step: the crushed deinked pulp enters the high-consistency desander for preliminary purification, the pulping concentration is 3.0-4.5%, and the pulping pressure is 200-280kpa;
[0021] (3) Coarse screening step: After preliminary purification, the operating concentration is 2.0-3.0%, the minimum slurry feeding pressure is 200kpa, and the working pressure difference of the coarse screening is 3...
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The invention relates to application of book paper to wastepaper deinking instead of office wastepaper, which includes: pulping, high concentration degritting, coarse screening, flotation, fine screening, low concentration degritting, concentrating, thermal dispersing and bleaching. As one floatation tank and one thermal dispersing procedure are used in the floatation and thermal dispersing procedure, equipment configuration is simple and costs on production equipment are reduced greatly. Process conditions are optimized, so that ink and sticky particles in the finished pulp are reduced evidently, appearance quality and quality of the pulp are improved greatly, usage of deinked pulp for paperboards is increased from original 5% to 20%, usage of commercial pulp for paperboard production is reduced, and production cost is reduced.
Description
technical field [0001] The invention relates to the application of waste paper deinking, in particular to the application of book paper in waste paper deinking instead of office waste paper. Background technique [0002] At present, waste paper has become an important source of papermaking technology, and its proportion is increasing. The recycling of waste paper is an effective way to solve the three major problems of paper industry fabrics, such as shortage of raw materials, energy shortage and serious pollution. Deinking is The key to waste paper recycling; the existing waste paper deinking production line mainly provides lining slurry for the gray bottom whiteboard system. The raw materials used are mainly old newsprint and old magazines. Whiteness ≥ 57%, residual ink, stickies, dust ≤ 95 in the slurry can be used. [0003] However, in recent years, due to the low market price of cardboard and no profit margins, in order to win the market in the downturn, it is necessar...
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IPC IPC(8): D21C5/02D21B1/32D21H11/14D21D5/02D21D5/18D21C9/16
CPCY02W30/64
Inventor 黄学川杨万海
Owner 中冶美利浆纸有限公司