DE1947363A1 - Paper industry waste water residues worked - up into constructional materials - Google Patents

Abstract

Residue from sulphite liquors and other waste waters from paper industry deposited on filter and collecting device is enriched with binders and/or (in) organic fillers and dehydrated for short periods in suitable able moulds, pre-compressed, dried in a drying furnace under excess CO2 at 60-70 degrees C and carbonised. Pref. carbonised pre-dried press-cake is subjected to second pressure process with heating at 80-180 degrees C, optionally with surface lamination, veneering, and pref. it is compressed to smaller cross-sections.

Description

Process for the production of molded bodies from sulphite liquor or waste the paper industry.

The preparation of the raw materials necessary for paper manufacture - especially wood - to suitable fiber material, which in connection with inorganic - organic substances are processed into paper as digestion or fillers, requires large amounts of water to be used. (Service water) This service water which arise at different plants, are with a number of waste materials permeated and polluted.

They are exempted from these substances in sedimentation and sewage treatment plants, whichever then present as a white chiamm. This waste material was previously on the waste dumps driven and left to rot after being previously treated with valuable fillers provided, was pressed in filter systems to form solid press chucks. The addition of these fillers was necessary and this sulphite liquor to a solid phase bring them and make them transportable. For this purpose, as a compression agent in particular -Lime used so that settling processes could take place before filtering out.

The substance content of the process water is determined to be 25 - 28% 0 been. It results from the various work processes within production.

Further findings have shown that z. B. alone in a large company In the wallpapering industry, there is a daily accumulation of 25 - 40 tons of sludge Before filtering, 5 - 10 tons of lime had to be added as a thickening agent, to make filtering possible in the first place. Then there were the problems of the Storage of these waste materials for rotting and their removal to these dumps, which had to be bathed far outside of inhabited areas as a result of the Rotting of malodorous sulphurous fumes that form. (Sulfur bacteria) According to the invention, the waste has now been analyzed and checked for Usability examined. It was found that this waste material due to its Compositions of various substances, at least seen theoretically - as structural valuable binder - is to be considered. To explain this, a short Overview are shown.

It is known that the paper converting industry in particular Wood used as the basic product. This wood is delivered in logs and- cut to specific lengths. Then debarked and in special systems in Chambers stored, which are charged with superheated steam of approx. 170 degrees. Under a pressure of approx.

6 atü, the wood is removed from the resins in a five-hour process freed and then subjected to a defibering process.

During this fiber process, approx. 175 - 200 m3 of water per ton of fiber material consumed. The resulting wood pulp is passed through filters and captured -As it has been shown, however, these filters are not tight enough to the fibrous material all in all. capture.

This means that a total of 12.5 - 15% of valuable fibers go into the process water. The leaching substances also accumulate from the display chambers, which are known as - humins - alcohol. Vannelic acid - formic acid - and acetic acid was found alongside the already the aforementioned various resins.

The preparation of the wood is essentially different in two ways Processes marked: 1. The white sanding.

2. The brown cut.

Contains the wastewater from the whitening shop that occurs at 1. suspended colorants and little organic leachate. js root product for this is spruce wood.

The wastewater produced by 2. contains predominantly organic leachates. The basic product is pine wood.

However, the machines of the Paper industry. These include the Dutch. The knot catcher of the paper machine. The wire and suction devices of the paper machine and the couch rolls.

Finally, the material gluing necessary for paper production, Filler and bleach etc. the z. T. immigrated in the process waters, considered more closely will.

Materials used to glue the fibers together include resin acids Sodium (Hareseife) as well as alum. Both result in a connection - resin acid aluminum (Aluminicoll) which, in addition to the fiber binding, makes the paper difficult to water permeability.

Finally, the leachate is a component of the wastewater to mention, which are present as soft and hard resin.

Both are high in carbon and a fusion occurs with calhydrate, resulting in a composition of the following type: - rosin esters (Resine) resin acid (resinoleic acid) and resene.

Another important link in the work process is education der - Aluminocolle.

They are created by precipitating sulfuric alumina with resin soap.

Sulfuric acid alumina is - (A12 (s04) 3/6 or that in the paper industry used alum - KAL (504) 2.

So the resin soap is created by using a resin acid ester mixed with alkali.

If you now consider those present contained in the service water Substances and compounds, so you can see that these are valuable high quality Binder of a structural type acts. For example calcium and magnesium compounds the carbonate, as well as the silicate. Furthermore, the gypsum as a calcium compound of the Sulfate. In addition there are the resins and resin compounds, i.e. resin soap, aluminocoll, Resin, resinoleic acid and resene, which are in the process water in a dissolved state or as a connection.

According to the invention, the process water of the paper-making industries is used and their related industries in a manner known per se from the containing Substances freed via sedimentation and sewage treatment plants and filtered out into firm cakes. this takes place as already described with the addition of thickeners. At this Filtering also includes the fiber content in the process water.

The preparation of the new molding compound according to the invention is now made so that the filter cake is slurried again to form a dense Porridge. This immediately becomes an addition of - fungus and sulfur bacteria hostile - Connections added.

During a bit the filtering of the waste material or the settling processes It took several hours to achieve a solid mass, these are according to the invention Processes reduced to a few times. procedurally, however, this is only due to waste the sulphite liquor with e.g. - fibrous materials - such as wood fibers, or other fillers such as inorganic substances in pearl or semolina form possible. This can be a far-reaching Dehydration can take place, e.g. in a molding with a cross-section of 30 mm limited to a total of 8 seconds of vacuum exposure, with the filling height of the casting compound Was 70-90 mm. Now receives such a molding after the dehydration in the mold still has a surface pressure of approx. 1-3 kg / cm2, the compact can be Form can be taken.

The cross-section of the molding is due to the subsequent compression when using 3kg / cm 2, once reduced to approx. 26 mm, with over the molding a uniform compression of the mass takes place and at the same time a smoothing of the Surface.

In preliminary tests, the shrinkage of the molding in the Drying can be largely determined. This is only possible - that must also be the case Blends with inorganic substances are taken into account, - as the sulphite liquor is especially enriched as constituents with kaolin, which is due to the scale structure an even shrinkage adheres.

If the waste material is an additional one before the drainage Binder added, so the scalene structure of the kaolin is hardened strengthened and further stabilized, especially since it is embedded in the fiber structure is.

Moldings produced in this way are now fed to the drying process.

As has already been analyzed, the sulphite liquor consists of a series of chem. Substances in a dissolved state or in combination Procedural Now drying is carried out at about 6o - 7o degrees. This drying will made in an oven, which is charged with CO2.

First, the presence of CO2 in the drying process has one effect faster dehydration, and secondly, 'those present or formed hydroxides - carbonized. This carbonization causes a high hurdle the preforms and at the same time good flame resistance, since those contained in the preform Fibers are included in the carbonization, which already before the carbonization a flame-retardant protection by accumulation by the existing - kaolin - experienced When using - additional binders - especially - condensation products such as - urea-formaldehyde glue, phenol-formaldehyde glue, polyvinyl acetate and the like. proven gluing media, including acid-hardening glue joints or plastics, if the aforementioned, pre-pressed, carbonized molding of e.g.

26 mm thick stored after drying. He can do this in this strength receive a surface coating, e.g. veneer This should be the final thickness after the veneering process can be set at 22 mm. Depending on the type of glue, there is one conventional gluing is useful.

The same molding can also be coated with a melamine paper surface evaluate, whereby the molding is excellent even with a cross-section of 20 mm Surfaces shows.

The manufacture of those made by the carbonation process Shaped bodies can be used as pre-dried blanks, depending on the type of binder used be pressed to their final thickness at different high temperatures, you have a particularly fine structure and can be dyed in all colors thanks to their white appearance.

Through this procedural use of residues from the process water in the paper industry and its development into molding compounds is a step forward technology has been achieved,

Claims (4)

Patent claims: 1. Process for the production of moldings from Waste materials from the paper industry, characterized in that the as catch and Claenstoff residue from process water occurring in settling and filter systems the paper industry additionally with binders and organic or inorganic Fillers enriched and briefly dehydrated in appropriate molding devices, pre-compressed and in a drying oven with an excess of C02 at 6o - 70 degrees Celsius is dried and carbonized. 2. Claim according to paragraph 1 and 2, characterized in that the carbonized pre-dried press cakes are subjected to a second pressing process with the action and heat is in the temperature ranges between 80 - 18c degrees Celsius taking at the same time the surfaces can be coated. 3. The method according to claim 1-3, characterized in that the Carbonized, pre-dried shaped cake in the second pressing process from its original one Cross-section can be pressed to any smaller cross-sections. 4. The method according to claim 1-4, characterized in that the catch and Claenstoff is enriched with suitable binders and then through appropriate additives - such as polyvinyl acetate - and appropriate hardening agents creates a porous body which is subsequently carbonized in this state and dries or sewn.