DE4139777C2 - Process for the treatment of wastewater-solid mixture resulting from paper production and use of the solid mixture - Google Patents

Description

The invention relates to a method for Processing and recycling of the at Preparation of waste paper waste water mixture of substances.

In the manufacture of paper, the prepro dukt, d. H. Pulp, wood, straw pulp or Rag pulp or also waste paper filler added substances with which a closed upper area should be achieved and thus the whiteness of the paper should be improved.

When processing waste paper in order to be used for Paper production required waste paper pulp to come, these fillers fall back then in paper production this is now available were added to the waste paper as a waste product at. This waste product consists e.g. B. from 50% by weight Cellulose, 25% by weight kaolin, 20% by weight calcium carbo nat, but also small proportions of gypsum, titanium oxide and other solids are present.

In the previous processing of waste paper proceeded so that these waste materials as one  Waste water solid mixture from the process be changed. So far, this is a pure waste product, which is about 50 wt .-% Water and about 50 wt .-% consists of solids and that is stored in landfills. The preparation this waste product to landfill it at all Making it capable is expensive. Furthermore are costs for the transport of this waste product and finally the landfill costs to consider as this waste product for example, not to add protection insulation is suitable.

In the Netherlands, for example, around 100,000 tons fall Year of this waste product, which is about 50% by weight of solids and 50% by weight There is water.

In the magazine "Das Papier 26/1972" is about this removal of the residual sewage sludge is reported and explained that although the problem of Ab separation of the sludge water called dissolved but the question of sludge removal can be is still unsettled. It is pointed out here that in normal paper production the remainder water sludge z. B. in brick factories as a burnout, is used to achieve porous bricks or that fire protection fibers from residual sewage sludge be won. Composting is also used Sludge recovery used.

Also in the magazine "Silikattechnik 36" (5), Page 135 is only processed by the at normal paper production Sediments reports, with one in the foreground  Kaolin extraction, the production of thermal insulation fabrics and use as a plaster additive concrete is explained.

From the literature reference "Wochenblatt für Papierfa brication 23/24 - 1977 "will be reused the ashes of sewage sludge.

From the literature reference "Wochenblatt für Papierfa brication No. 6/1974 "was stated that the Most convenient and most practiced solution Landfill of the resulting sludge.

Basically, it should also be noted that it is known (DE-OS 16 71 017 and DE-OS 22 17 587), Acrylic resin for the production of building boards or Use or add foundry models. This one Literature is not a reference to the Recycling of old waste paper sludge.  

According to a not yet to the state of the art hearing proposal suggests that the mud-like water-solid mixture intensely ge is mixed and then this mixture made of water and solid, fine or very fine is noted.

The mixtures obtained according to this process can used for the production of paint, glue or putty be set.

The invention is based, from which a muddy solid mixture a rough draft to produce material with strength. Before this material should also be shaped into plates will. But it can also be used as a screed application the.

This object underlying the invention will solved by the teaching of the main claim.

The mixture of the sludge-like solid mixture is necessary because this waste mixture at its Emergence is by no means intensely mixed, but from very different solid lenses or Solid conglomerates can exist. As a result of that according to the invention, the solid mixture only longer fibers remain in the mix obtained mixture after adding a resin a tensile design of the material Effect drying of the same. The material can be dried plate-like, so that it as a damping material, for example in motor vehicles construction or generally as insulation material, in furniture belbau or can be used as floor slabs.  

The water absorption of the material is exceptional Lich low and the material can be highly flexible be so that it is contours, for example a vehicle body, adapts perfectly.

Crosslinkable resins together with the associated hardener can be used, the one rapid drying of the mixed solid mixture effect.

Claims (8)

1. A process for the preparation of the waste water / solid mixture resulting from the preparation of waste paper, the solids being composed essentially of cellulose, kaolin and calcium carbonate, characterized in that resin is added to the sludge-like solid mixture for the production of a base material for further processing the mixture is mixed intensively without the fibers and solid particles present in the mixture being destroyed. 2. The method according to claim 1, characterized records that the mud-like solid matter is dewatered before mixing. 3. The method according to claim 1, characterized records that the mud-like solid mix additionally with water before mixing is added. 4. Method according to one of the preceding An sayings, characterized in that a ver wettable resin together with a hardener Solid mixture is added. 5. Method according to one of the preceding An sayings, characterized in that as resin an acrylic resin is used. 6. Use of the according to the procedure according to a of the preceding claims mixed substances as a basic material for the manufacturer provision of damping and insulating material. 7. Use of the according to the procedure according to a of the preceding claims mixture of substances as base material for the plat ten industry. 8. Use of the according to the procedure according to a of the preceding claims mixed substances as a basic material for the manufacturer position of screed.