CN1247916A

CN1247916A - Paper-making sludge recovering and reusing equipment

Info

Publication number: CN1247916A
Application number: CN 99117814
Authority: CN
Inventors: 陈启松
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-08-17
Filing date: 1999-08-17
Publication date: 2000-03-22

Abstract

The equipment and technology of the present invention can be used to recover short and micro fibers in paper making sludge after physical and chemical treatment for reuse in paper making. In the equipment, paper making sludge is first separated in grit depositing separator to obtain short and micro fibers, which are then mixed with high molecular flocculant in coagulator to focculate before being fed to paper pulp tank to be mixed with new pulp in the ratio of 5-15% to 100%. The present invention has obvious environment and economic utility.

Description

Paper-making sludge recovering and reusing equipment

A kind of device that the small fiber recovery in the paper mill sludge can be used for recycled paper.

The pollution of papermaking wastewater is one of primary pollution source of environmental protection always: it is reported 3,000 ten thousand tons/a of the total papermaking amount of China, total sewage quantity is 1,800,000,000 tons/a; So big pollution total amount certainly will cause governments at all levels and environment specialist's great attention.How papermaking wastewater is carried out scientific and reasonable improvement, to reduce the pollution treatment gross investment to greatest extent, recycle-water resource and fiber, turn waste into wealth, make pollution treatment energy extra earning, produce positive benefit, this is that domestic and international expert dreams of, and the problem of for this reason having made arduous effort, also be the common hot issue of paying close attention to of pollution treatment enterprise.

Is what material pollutant in the papermaking wastewater (or being called pollution factor) actually? by analyzing, roughly can be divided into three:

1, staple fibre: this part fiber refers to the fiber of length more than 0.2mm, and its total amount is generally 0.5-1.5 ‰, and most papermaking enterprises have been noticed the recovery of staple fibre, but because method is simple, and the rate of recovery is lower, waste greatly.

2, fento: fento refers to the extremely short fiber between 0.2 μ in the fibre length～0.2mm, and in the paper mill sludge that materialization is handled, the total amount of fento accounts for 85～90%, and fento may become short fiber and reclaims with the high polymer coagulant spreading, is the thing that valency is arranged; The total amount of fento in papermaking wastewater is about 0.4～0.5 ‰.

3, mud and impurity really belong to mud and impurity part in so-called paper mill sludge, can not reuse or unserviceable account for 10～15%, these mud and impurity can only deal with in addition, generally can make anhydration and incineration and handle.

The objective of the invention is: provide the fento of the short fiber in the paper mill sludge that a kind of energy will handle (air supporting slag or precipitation slag) through materialization all to reclaim, be used for the device and the technology of recycled paper, fill up the technological gap in this field both at home and abroad.

In order to achieve the above object, the technical solution used in the present invention is: paper mill sludge is isolated short fiber and fento through the sand setting separator earlier; Recycled paper after adding high polymer coagulant (as polyacrylamide) again and advancing to send back to after coagulator flocculation is built bridge vat mix (5～15%) in proportion with new slurry.

Below in conjunction with accompanying drawing, provide detail of the present invention.

Accompanying drawing is a structure diagram of the present invention, among the figure:

1. bearing 4. coagulation tubes 7. pulp-inlet pipes 10. sediment outflow pipes

2. cross over pipe 5. discharge pipes 8. big agitators

3. little agitator 6. dosers 9. sand-precipitating tubes

As shown in the figure: big agitator 8 is housed in sand-precipitating tube 9, and tube 9 tops are connected to pulp-inlet pipe 7, and sediment outflow pipe 10 is arranged at the bottom, and housing is supported by bearing 1; Between sand-precipitating tube 9 and coagulation tube 4 cross over pipe 2 is housed, by chemicals dosing plant 6 is arranged, little agitator 3 is housed in the coagulation tube 4 on the cross over pipe, the top is connected to discharge pipe 5.

Solid content at 2～3% papermaking materialized mud by a to entering in the sand-precipitating tube along pulp-inlet pipe, under the stirring of big shaft, finish the separation between fiber and the sand setting, sand setting by the sediment outflow pipe by b to discharge; Fiber pulp enters the coagulation tube after the cross over pipe dosing, finish under the stirring of little agitator and join stock tank along c to being sent to by discharge pipe after flocculation is built bridge; Thereby finish the whole recovery process.

Example one: Zhejiang Paper Co., Ltd, year make 40,000 tons of yellow plate papers, with waste paper main raw material, 10,000 tons of day sewage effluent amounts are listed in the emphasis pollution treatment unit of Taihu Lake basin undertaking treatment within a prescribed limit of time qualified discharge.4,000,000 yuan of construction investments, behind the engineering operation, short fiber and 90% waste residue obtain utilizing.3200 tons of annual recyclable paper pulp (being worth 600～800 yuan/T slurry).

Example two: the sea salt paper mill, 30,000 tons of year papermaking, 8000 tons of day sewage effluent amounts, entire sewage is handled 2,600,000 yuan of engineerings, and behind the engineering operation, short fiber and 90% waste residue obtain utilizing, and 2500 tons of annual recyclable paper pulp have also been made a watt rib paper.

The present invention compared with prior art, the useful effect that has is:

1, advanced technology has been filled up internal and international sky at the paper-making pollution treatment technology In vain;

2, low equipment investment, simple and practical.

3, the remarkable in economical benefits of environmental benefit, if the present invention is promoted in the whole nation, 1,500,000 tons/a of annual recyclable paper pulp (be worth 9～1,200,000,000 yuan/a), and the secondary pollution of effectively having stopped paper mill sludge.

Therefore, the present invention handles on the engineering at papermaking wastewater, and great application value is arranged.

Claims

1, a kind of can it is characterized in that with the small fiber recovery in the paper mill sludge just in the device of recycled paper: big agitator 8 is housed in sand-precipitating tube 9, and tube 9 tops are connected to pulp-inlet pipe 7, and sediment outflow pipe 10 is arranged at the bottom, and housing is supported by bearing 1.

2, device according to claim 1, it also comprises: between sand-precipitating tube 9 and coagulation tube 4 cross over pipe 2 is housed, by chemicals dosing plant 6 is arranged, little agitator 3 is housed in the coagulation tube 4 on the cross over pipe, the top is connected to discharge pipe 5.