Granular filler materials, methods of producing them and ceramic mouldings containing said fillers

BL.NDLSKEPUßLIK GERMANY GERMAN% · '. ·> $ PATENT OFFICE

Laid

Int. Cl .:

German Kl .:

Number: 1254 591

Reference: VV 40440 IVc / 12c

Date of filing: December 6, 1965

Exhibition day: 23rd November 1967

For the absorption of liquids, especially oils, it has been used many times granular, spongy or fibrous materials such as sand, sowing chips, peat, asbestos, kieselguhr. Blowing mica or sponges. *

These substances are not generally usable because they are not ge^cAll fluids, especially aggressive chemicals, are stable.

On the other hand, their capacity for absorption is not very high, so that they have to be used in larger quantities. The subject of the invention is the use of a granular product which has been prepared by dissolving a fibrous silicate in aqueous alkali metal silicate solution in the ratio of 0.02 to 0.7: 1, drying. Crushing. Aufbi ing a surface layer of lime and heating to 700 to 1000 C and optionally crushing for absorbing liquids.

The Eifindungsgemäß used product is ideal for the above purposes. Fs ao has a surprisingly high absorbency, is indifferent to most chemicals and easy to regenerate.

The production of the product used which is not to be protected h'cr is described as follows:

1 1 water-glass is diluted with 500 ecm of water in which 3 g of ZnSC) and 4 g of glycerol are dissolved, then evaporated with the addition of 50 g of rockwool while stirring until the rockwool is dissolved and the cicatrized mixture is still 55 to 65 ° / o contains water. After further drying to 5 to 20% V-content, the product was comminuted and sieved to a particle size of 0.5 to 2 mm in diameter. The granular precursor thus obtained is immersed in a lime suspension and then heated in a mold to a melting temperature between 600 and 100 ° C. After melting the I'orm is removed from the oven and removed the formed, not fused together foam glass balls from 1 to about 10 mm in diameter.

It was also quite surprising that a comminuted product - as described above - would be so outstandingly suitable for sucking up liquids and would far exceed the absorbency of kieselguhr. The products are in Lat'c to absorb any neutral, acidic or alkaline liquids; particularly advantageous is their J.igenschaft, after water repellency to absorb water floating oil. The granules remain buoyant even in vollgesaugtem state, so that it is possible, for example, larger, granular silicate for absorbing

liquids

applicant:

Wasag-Chemie Aktiengesellschaft,

F.ssen, Rolandstr. 9

Named as Frfinder:

Dr. Stefan Kraemer, Essen;

Alois Seidl, Thuringia

to cleanse water contaminated by oil. This may be particularly important in the inlet of water in the drinking water supply serving dams. Even in the case of tanker accidents, the fire department, with its particularly absorbent, non-combustible and resistant foam glass particles, has a means by which oily or other gum-water-polluting liquids can be eliminated.

The density of the foam glass particles for absorbing liquids is between 0.05 and 0.15 cm.¹, They have a suction capacity of up to 70% by volume, surpassing most of the previously known means of vacuuming liquids.

For example, 1 kg of kieselguhr is capable of about 200 cm¹ To absorb water. In contrast, 1 kg of a granular product, prepared as described above, with a surface layer of a lime suspension and with a particle size of 0.5 to 2 mm, is able to absorb 6 l of water.

In use, the foam glass particles are scattered in sufficient quantity on the liquid to be absorbed; After vacuuming, they are easy to learn. If traces of the liquid remain, they can easily be removed by re-scattering. Particularly advantageous is the use for absorbing aggressive liquids in the laboratory, such as concentrated nitric acid.

Depending on the type of liquid absorbed, the foam glass particles can become rainy by being soaked and / or dried, in particular by the application of heat, and are then reusable.

709 629/404