DK167492B1 - Mixture of a granular waste product and a granular or non- granular useful product for making use of the waste product in the building and construction industry, and a process for producing it - Google Patents

Description

The present invention relates to a mixture of a granular waste product with a granular or uncooked utility product for recovery of the waste product as set forth in the preamble of claim 1.

DK 167492 B1 - i - 5 German Patent Specification No. 36 21 838 discloses a refractory concrete and method for making it by admixture of a waste product, glass slag flour produced by coal-fired power plants. The dry blend may advantageously consist of at least 60% by weight and not more than 85% by weight of glass slag and, moreover, of cement, especially with a proportion of glass layer between 70 and 80% by weight, preferably 75% by weight. Waste from the sandblasting industry should not be used.

Sand blasting with quartz sand, aluminum silicate and iron silicate results in the use of sand blasting agents to the extent of at least 57,000 tonnes per year in 15 Denmark. This used material has so far been run on landfill.

It is the object of the invention to provide a mixture of this most often fine grained material with a grainy or un grained utility product to recover the waste product in the industry.

20

The composition according to the invention is characterized by the characterizing part of claim 1.

It has been proven over many years that a considerable saving is achieved here without significantly deteriorating the quality of the asphalt, concrete and brickwork industry.

Savings of the expensive filler materials in the asphalt and concrete industry are achieved.

In the brick-and-mortar industry, the blowing agents used may be added in connection with the laying and molding of the clay in amounts corresponding to the clay's adhesiveness, thereby avoiding problems with the clay's adhesion to the molds.

35 The spent blowing agent is added at a given percentage, calculated on the basis of the filler requirements of the individual raw materials, but the blend weight percentage can often advantageously be 5% by weight.

In the following subclaims some advantageous embodiments are given. Furthermore, a method of manufacture is disclosed.

The invention is explained in the following by some examples: 5

Example 1.

As the worn blowing agents after the sandblasting are often very fine grained, for example reduced from a grain size of 0.3-2.0 mm. for a product with 10 40% <0.25 mm. and not more than 2%> 1 mm., they can advantageously be used as filler additives in the asphalt and concrete industry as well as as filler material in brick production.

Example 2.

15

Broken asphalt can, after crushing, be re-used in the asphalt industry, and here the addition of spent blowing agents can constitute a proportion of the normally added filler material which is relatively expensive to purchase and which is necessary for filling voids in carriers.

20

Example 3

During the crushing of large stones into shards, a filler material is called stone flour. This product requires a certain amount of filler, especially lime-25 filler. By adding a controlled amount of blowing agent used, a saving of the expensive additive filling material can be achieved.

Example 4

30 In brick-making production, the clay materials are often too greasy, which is why fine-grained sandy materials are added. These may advantageously here be replaced in whole or in part by purified spent blowing agents.

35 - 3 -

In raw material manufacturers and / or concrete producers, spent blowing agent is added to the sand material to thereby form part of the filler contents for filling voids in the finished concrete, thereby increasing the concrete strength.

DK 167492 B1

Example 5

5 Cast concrete, for example from demolitions and discarded cast concrete from concrete products and / or element production can be crushed to support gravel, and there is also a filler requirement that can be filled with spent blowing agents.

One convenient method of preparing the present blend 10 is as follows: The spent blowing agents are collected from the sandblasting area and taken to an intermediate storage where they are cleaned of coarse impurities, etc.

15 The purified blowing agents are then supplied to the asphalt, concrete and brickwork industries, where they are mixed with the final products before their manufacture. 1

Claims (5)

1. Mixing of a granular waste product with a granular or uncooked utility product for the recovery of the waste product in the construction industry, characterized in that the waste product is collected and cleaned spent blowing agents. 5 2. A blend according to claim 1 or characterized in that the waste product is used and broken blowing agents from sand blasting with quartz sand. Composition according to claim 1, characterized in that the waste product is aluminum silicate. Mixture according to claim 1, characterized in that the waste product is copper slag (iron silicate). 15 Process for preparing a mixture according to claim 1, characterized in that a spent sand blasting agent, of which substantially 40% has a grain size <0.25 mm. and not more than 2%> 1 mm., are collected from the sandblasting area and transported to intermediate storage where they are cleaned of coarse 20 impurities, after which the spent sandblasting agent is mixed in sand, clay or asphalt. 25