HU194790B - Process for production of building units, e.g. isolating plates, bricks from paper-mud - Google Patents

Abstract

Waste paper is ground up and mixed with cement in a ratio of 3:1 and 10% lime soln. The mixt. is spread into forms, compacted and dried before using as insulating material.

Description

The present invention relates to a process for the manufacture of building elements such as insulating panels, bricks and paper sludge.

As is known, paper sludge is a by-product of papermaking. The paper sludge is stored outdoors in a state designated for this purpose by grinding or graveling it because of its environmental impact. This type of storage requires a lot of effort.

Many attempts have been made to utilize paper sludge for construction purposes, but so far no product has been produced for use in mass-produced paper sludge-based construction. Paper sludge, as an environmental pollutant, is accumulating in ever greater quantities.

It is an object of the present invention to overcome these drawbacks and to provide a method for making building elements such as bricks, insulating panels, etc. from paper sludge and of course other required additives. can be produced.

The invention is based on the discovery that the above purpose can be fulfilled if the paper sludge is naturally mixed in a properly prepared state with cement and lime solution and further processed accordingly.

The invention thus relates to a process for the manufacture of building elements such as insulating panels, bricks from paper sludge. SUMMARY OF THE INVENTION The paper slurry to be used is dried, preferably with a hammer grinder, broken into elementary fibers, the slurry thus prepared is mixed in 1-3 parts by weight with 0.5-1.5 parts by weight of cement and 5-20% by weight of lime solution. We lay it in a template or fill it, we compact it with a vibrator until the cement milk appears on the surface.

In a preferred embodiment of the invention, one part cement, three parts paper slurry and 10 m / l limestone solution are used for mixing. Advantageously, stirring is performed in a 4 minute cycle. Preferably, drying in the drying tunnel is carried out at 60-80 ° C. Preferably the drying is carried out for 4 hours. Post-maturation is preferably 16 days.

If the building elements produced by the process according to the invention are to be particularly resistant to water, the post-cured product should be post-treated or coated with water glass.

The process of the present invention makes it possible to use paper sludge in construction, i.e., to produce paper sludge-based elements that can be used in a wide variety of construction purposes, and can even be commercially manufactured.

The invention will now be described in more detail with reference to exemplary embodiments.

Example 1

If you want to make bricks in quantities of 500 pieces or less per day, the procedure is as follows. The paper slurry is dried in a drying chamber to a moisture content of 3-5%. After drying, the material is broken down into filaments in a hammer grinder or in a roller mill. The ground paper slurry is added to a concrete mixing machine with a speed of 250 rpm and one component cement and 10% by weight lime solution are added to three parts of paper slurry. These are stirred for 4 minutes. The mixture is filled into brick size templates, i.e. 50 x 25 x 25 cm. The templates are placed on a high-frequency shaking table before use. Vibrate compacting until the excess lime solution is deposited at the top of the template. An additional mixture is then added to the top edge of the template, and the template is flattened along the top edge. The filled templates were placed in a drying tunnel and dried in a warm air stream at 60 ° C for 4 hours. After drying, the template is removed and the bricks formulated. The shuttered products are stored in a covered, ventilated storage place with a maximum of four rows stacked and cured for 16-18 days. Then the bricks can be transported for use. The bricks must be protected with dripping water by dripping water and protected from rain during installation, until a plaster layer is applied to the surface.

Example 2

If larger quantities of bricks are required, the process described above is modified as follows. The drying and preparation of the paper sludge is the same. For mixing, however, a concrete mixer with a capacity of 15 m ³ / h is already required. Here, the blended paper sludge mixture is fed to a block making machine, pressing and vibrating to produce 2, 3 bricks per minute. Here the bricks are inserted into the dryer without a template.

The bricks thus produced are also cured for 16-18 days.

Example 3

In the case of insulating sheets, the paper sludge is prepared in the same way, that is, dried and then broken down into filaments as in the case of brick making. Also mix the paper sludge, cement and lime solution in a composition similar to that described in brick making. The mixture is spread on a flat metal surface, possibly in a template, depending on the need, in a layer of 4-20 cm. Here, too, the compacting is done with a vibrator until the cement milk appears on the surface of the product.

The product, together with the template, is dried in a 60-80 ° C dry drying tunnel for 4 hours. After drying, the product is removed from the template or sheet and cured for 16 days in a covered, dry, well-ventilated area.

If necessary, the sheets are made waterproof by post-treatment.

The insulating panels thus produced can be used in the manufacture of sandwich panels, e.g. nickel sheets or slag wool as insulation material.

As can be seen from the examples described above, the process according to the invention makes it possible to use paper sludge advantageously in the construction industry by very simple technological steps.

Claims (7)

Claims A process for producing building elements such as insulating panels, bricks from paper sludge, characterized in that the paper sludge to be used is dried and then preferably broken into elementary fibers with a hammer grinder, the resulting paper sludge being in 1-3 parts with 0.5-1.5 parts cement and 5 parts. It is mixed with 20% lime solution and the mixture is laid or filled on a flat surface or template, compacted with a vibrator until the cement milk appears on the surface, then dried together with the template in a drying tunnel, and the elements are removed by venting after removing the template. A process according to claim 1, characterized in that one part cement, three parts paper slurry and 10 m / l lime solution are used for mixing. Process according to claim 1 or 2, characterized in that the mixing is carried out in a 4 minute cycle. 4. A process according to any one of claims 1 to 4, characterized in that drying in the drying tunnel is carried out at 60-80 ° C. 5. Process according to any one of claims 1 to 4, characterized in that the drying is carried out for 4 hours. 6. Process according to any one of claims 1 to 5, characterized in that the post-maturation is carried out for 16-18 days. 7. A process according to any one of claims 1 to 3, characterized in that the post-cured product is post-treated or coated with a water cap.