SE457359B - PROCEDURE AND DEVICE FOR PREPARING A SECONDARY FIBER MATERIAL OF RECOVERY PAPER - Google Patents

Description

10 457 359 * Garbage adheres to fats, oils, salts and vegetable products adheres to the paper, which interferes with the deinking process and significantly interferes with the increase in the degree of whiteness.

The invention relates to a process for the preparation of a secondary fibrous material of recycled paper, which is soiled with fats, oils, salts, vegetable wastes, waxes, resins and dissolved organic substances, the recycled paper being passed through arrangements for storage, sorting and dewatering and then undergo conventional paper processing steps such as blackening, various fiber treatment and purification steps and those on successive storage, sorting and dewatering the steps with the recycled paper are performed in a first, especially cold, _cycle.

The object of the invention was to remove the above-mentioned interference the substances in a purification cycle, so that the subsequent the reprocessing process is not disturbed without a high-mass fiber mass quality can be obtained with or without the deinking process.

This object is achieved according to the invention by the conventional after the first cycle, the treatment steps are carried in the form of a separate, second, for example hot, cycle, which is separate from the first, especially cold, cycle, that the separate second, especially hot, cycle for it the subsequent treatment of the fibrous material is provided with a separate waste water circuit, which is arranged separately from the the tap water cycle in the first, especially cold, cycle, and that the pressurized water from the dewatering step in the first, particularly cold, the cycle is led to a wastewater treatment plant order in which the fats, oils, vegetable waste, the waxes, resins and dissolved organic substances are separated, as well as the purified cold water from the first, especially cold, the cycle is fed to the beating step in the first, especially cold, the cycle as dilution water.

In order to be able to carry out the procedure, known per se openers, perforated drums and the like, . ' 457 359 hole sorters are used for pre-sorting and for drainage dewaterers with inclined shaft or double wire presses and which wastewater treatment plant of sewage treatment plant, screening system and similar.

An apparatus for performing the method comprises a look-up steps in which recycled paper material is passed through at least things openers or lumber drums, a pre-sorting step, wherein the material from the look-up step is taken up and guided through at least either a cyclone, a purifier, a perforated sorting device or a slotted sorting device, watering step, one of- wherein the material from the pre-sorting step is taken up and passed through at least one screw thickener or a double wire belt press, whereby storage, sorting and dewatering the forming devices form a first, especially cold, cycle, followed by conventional fiber treatment steps, which form a others, for example hot, cycle, wastewater cycle in the first, especially cold, cycle is separated from the the water cycle in the other, for example hot, the cycle and is provided with a wastewater treatment device, the water from the dewatering step in the first, which occupies the press especially cold, circuit the barrel and is provided with a device for returning the purified -cold the water from the first, especially cold, cycle as dilution water to the storage step in the first, especially cold, the cycle. The advantage of this procedure is that by separating it the first cycle reaches an intermediate dilution, at which the extruded water is treated in a water reprocessing laying and reused as storage water. Thereby dissolve organic substances, fats, oils and vegetables lical products are separated even before further processing.

If a deinking plant is used, this will result in a saving of chemicals, as these do not need to be added until the beginning of the second cycle. Sticky contaminants are sorted out for the most part before a possible heating in non-southern and not softened state. If a deinking plant was used the water overflow can take place in the first cold cycle and that i4s7 ss? the hot cycle is thus closed, whereby further is achieved an energy saving. As a result, a higher fiber pulp quality is obtained with a higher degree of purity.

The invention is described in more detail with the aid of an exemplary embodiment.

The drawing schematically shows the procedure for reprocessing paper. F As can be seen from the figure, the processing of paper is divided into two groups, a cold cycle l comprising the different ones procedural steps, while a hot cycle 2 schedule shows the known reprocessing process._The new reprocessing the working procedure consists in adding dirty recycled paper res lookup 3. This lookup 3 consists of a lookup or a hollow drum and is designed in a manner similar to known It is important that the recycled paper is fed in the cold permission from look-up 3 to pre-sorting 4. This pre-sorting sorting 4 consists, for example, of a cyclone or re, in conjunction with hole or slot sorter. From here, set to the drainage 5, which device can be constituted by a water with inclined shaft or a double wire press. First here- from the goods for further processing to the hot circuit 2 and possibly to the paper machine.

The method according to the invention now consists in carrying dirty water to a wastewater treatment plant 6. This wastewater treatment plant treatment plant 6 can be designed as a sewage treatment plant, .but also screening systems can be used to advantage for this. From sewage treatment plant 6, the usable water is returned as a diluent water for storage 3. Excess dilution water is removed led via the overflow 9. From the pre-sorting 4, the contaminant 7 for abduction. From the waste water treatment plant 6 the sewage sludge 8 goes to landfill.

The previous cycle is thus divided into a cold cycle l and a hot cycle 2. However, it is essential that they resolve _! 'l' 457 359 the organic substances are separated even before the further the pickling. In addition, sticky contaminants can be sorted out before the heating in a non-decomposed and non-softened state.

Depending on the structure of the further reprocessing can a second wastewater treatment is also connected as an intermediary.

Claims (2)

457 359 PAIEÄTKRQV A process for the production of a secondary fibrous material of recovered paper contaminated with fats, oils, salts, vegetable wastes, waxes, resins and dissolved organic substances, the recovered paper being passed through storage devices (3) pre-sorting (4) and dewatering (5) and thereafter undergoing conventional paper processing steps such as deinking, various fiber treatment and purification steps and the successive storage, pre-sorting and dewatering steps with the recycled paper are performed in a first, especially cold, cycle (1), characterized in that the conventional subsequent treatment steps are carried out in the form of a separate, second, for example hot, cycle (2), which is separate from the first, especially cold, cycle (1), that the separate second, particularly hot, the cycle (2) for the subsequent treatment of the fibrous material is provided with a separate waste water cycle, which is arranged separately from the waste water cycle. to the first, especially cold, cycle, and that the pressurized water from the dewatering stage in the first, especially cold, cycle (1) leads to a waste water treatment device (6), wherein the fats, oils, vegetable waste, waxes, resins and the dissolved organic substances are separated, and the purified cold water from the first, especially cold, cycle is fed to the storage stage (3) in the first, especially cold, cycle as dilution water. Device for carrying out the method according to claim 1, comprising a folding step (3), wherein recycled paper material. guided through at least either opener or lumber, a pre-sorting stage (4), wherein the material from the storage stage is taken up and guided through at least one cyclone, a purification device, a perforated screening device or 457 359 a slotted sorting device, a dewatering stage (5), wherein the material from the pre-sorting step is taken up and the joint through at least one screw thickener or a double-wire belt press, the storage, pre-sorting and sweating devices forming a first, especially cold. cycle (1), followed by conventional fiber treatment steps, which form a second, for example hot, cycle (2), the effluent water cycle in the first, especially cold, cycle is separate from the waste water cycle in the second, for example hot, the cycle and is provided with a wastewater purification device (6), which absorbs the pressurized water from the dewatering step in the first, especially cold, cycle and is provided with a device for returning the purified cold water from the first, especially cold, cycle as dilution water to the storage stage (3) in it undertakes, especially cold, the cycle.