Magnetic separation and deinking method for waste paper

A waste paper and magnetic separation technology, which is applied in waste paper processing, paper making, paper recycling, etc., can solve the problems of increased difficulty in deinking and difficulty in achieving the desired effect, so as to save raw materials and energy, benefit the national economy, The effect of reducing pollution
CN101736635AInactive Publication Date: 2010-06-16有研资源环境技术研究院(北京)有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
有研资源环境技术研究院(北京)有限公司
Publication Date
2010-06-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a magnetic separation and deinking method for waste paper, comprising the following steps: (1) adding waste paper and magnetic seeds in a pulper, adding water, sodium silicate and NaOH for repulping, wherein the repulping conditions are as follows: the magnetic seed dosage is 0.05-0.2wt%, the dosage of sodium silicate is 2-10wt%, NaOH is used to regulate the pH value to be 7-10, and the pulp concentration is 10-15wt%; (2) adding water for diluting after water paper repulping until the pulp concentration to be 0.5-4wt%, adding flocculant which accounts for 0.01-0.1wt% of dry paper into the pulp after repulping for magnetic seed flocculation, enabling the deciduous ink particles to be adhered with magnetic seeds, wherein the pH value is 7.0-11.0, the time is 10-30min, and the stirring speed is 200-1000rpm; and (3) separating the flocculated ink particles from the pulp by a deinking device for size after magnetic seed flocculation. The method in the invention can obviously improve pulp whitness and fiber yield of water paper, and can be used for producing deinking pulp with high whiteness and high deinking rate and small amount of paper fiber loss.
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Description

technical field

[0001] The invention relates to a deinking method of waste paper, in particular to a magnetic separation deinking method of waste paper, which comprises magnetic separation and deinking after the ink contained in the pulp is condensed by magnetic seeds. Background technique

[0002] With the development of the economy and the improvement of living standards, people's demand for paper is increasing rapidly, and the amount of waste paper is also increasing. my country discards as many as 6 million tons of waste paper every year, which makes the municipal departments that are already plagued by garbage even more overwhelmed. At present, in addition to partial recycling, the treatment methods for waste paper are mostly incineration or landfill. Incineration will cause air pollution, and landfill will occupy a large area of ​​land.

[0003] Papermaking is characterized by high energy and water consumption, requires a large amount of wood, and produces a large am...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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