Method for producing additive for adhesives or building materials, additive for adhesives or building materials, and use of mixture of slate and desert sand as additive for adhesives or building materials

Abstract

The invention relates to a method for producing an additive for adhesives or building materials, said method comprising the following steps: grinding a mixture containing slate and desert sand.

Description

Technical Field

[0001] The invention relates to a method for producing an additive for an adhesive or a building material, an additive for an adhesive or a building material and the use of a mixture of slate and desert sand as an additive for an adhesive or a building material. Background Art

[0002] The use of sand, particularly for the production of building materials, has been discussed in the prior art.

[0003] These methods are often complex, cost- and energy-intensive, and rely on toxic adhesives or other problematic additives.

[0004] In some cases, desert sand cannot be used as a component of building materials, especially without reducing the quality, load-bearing capacity and durability of the building materials. Summary of the invention

[0005] The object of the present invention is to eliminate the disadvantages of the prior art.

[0006] Solution to the problem

[0007] The object of the invention is achieved by the subject matter of the independent claims. Advantageous embodiments are described in the dependent claims.

[0008] A method for producing an additive for an adhesive or a building material, the method comprising the following steps:

[0009] -Grind a mixture containing slate and desert sand.

[0010] Grinding can be performed in a suitable grinding apparatus.

[0011] As described below, the process is particularly preferably used for the production of additives for building materials.

[0012] The grinding can be carried out by simultaneously and jointly feeding the slate and the desert sand to a grinding device, i.e. a mill or the like. Alternatively, it is conceivable to first place the slate in the grinding device and then add the desert sand. The slate can be present, for example, in the form of gravel, chips, crushed stone, sand or powder, wherein preferably coarse grains, such as gravel, chips or crushed stone, are present. It can also be considered that the slate to be ground is a particle that is larger than crushed stone and gravel, or that the slate to be ground is not in particle form. If the slate has already been ground before the desert sand is added, then when the desert sand is added, there may already be slate particles, such as crushed stone, that are no larger than the desert sand particles by several orders of magnitude, which can simplify the grinding.

[0013] Another option is to grind the desert sand first and then add the slate.

[0014] However, in all exemplary embodiments, the slate and desert sand are preferably ground together for a period of time.

[0015] The mixture is preferably a bulk material.

[0016] In addition to slate and desert sand, the mix can also contain other ingredients. For example, organic matter can be added. In addition to desert sand, you may also want to consider adding sea sand. Sea sand naturally contains components such as dead sea plants and marine animals such as corals, which naturally contain carbon. Alternatively, you may want to consider adding substances that contain a lot of carbon in place of organic matter, even if they cannot be described as organic from a chemical point of view.

[0017] According to a preferred exemplary embodiment, the mixture may consist of slate, desert sand and sea sand.

[0018] According to another exemplary embodiment, the mixture may consist of slate, desert sand, and a carbon source.

[0019] According to an exemplary embodiment, the mixture may also be considered to consist of slate and desert sand and thus contain no other components besides the above two components.

[0020] The mixture preferably does not contain any binder which causes the components of the mixture to stick or clump together. This does not conflict with using the mixture as a component of a binder such as cement. The mixture is preferably used in cement etc. so as to subsequently become part of a building material to which cement etc. has been added as a binder.

[0021] Therefore, the mixture according to the exemplary embodiment of the present invention is particularly preferably used for building materials.

[0022] In addition to the above-mentioned mixture containing ground slate and desert sand together, this building material can also include at least one additive and at least one binder, for example, concrete can also be considered, which in addition to the above-mentioned mixture also includes aggregates commonly used in concrete production and cement as a binder. Building materials, especially concrete, can include other components intended, for example, to improve their properties. However, it can also be considered that the building material, especially concrete, consists of the above-mentioned mixture, additives and binder (such as cement), and therefore does not include any other components.

[0023] Since the method for producing an additive according to the aforementioned exemplary embodiment only comprises the grinding of the components, and does not comprise other steps such as producing larger particles from the ground components, the method is particularly easy to implement, environmentally friendly and inexpensive. These advantages are also achieved by not using toxic adhesives, which can cause the above-mentioned co-ground components to stick together, clump together, etc.

[0024] Desert sand is typically composed primarily of silicon dioxide. When slate is ground, the surfaces of the slate particles and desert sand particles change. According to one embodiment, the slate has a basic effect. During or after grinding, silicate compounds are formed. This can occur through the alkaline effect of the slate (particularly its alkaline components) or in other ways.

[0025] Additional or alternative surface modifications of the slate particles and / or desert sand particles are conceivable. In general, such surface modifications can be either chemical or purely mechanical in nature. This means that new bonds can be formed between atoms or molecules, or surface properties such as roughness or roughness depth can be changed. In particular, the roughness or roughness depth can be increased by grinding, thereby improving the effect of the mixture in concrete, for example, the rough particles in components made of concrete ensure greater stability and elasticity, because the bonding of the components contained in the concrete to one another is improved.

[0026] The breakage of the slate and sand during the grinding process and any surface changes that occur make the mixture a favourable additive for the production of adhesives, in particular for the production of building materials such as cement, lime, pozzolan, concrete, plaster or mortar. The mixture is particularly preferably used in building materials such as concrete, plaster or mortar.

[0027] Surface changes, such as greater roughness and silicate compounds formed on the surface can ensure that the mixture containing the co-ground slate and desert sand aggregates together to form larger particles after grinding, which may be advantageous when solidifying the building material using the mixture. Such agglomerated particles can also improve the mechanical properties of the hardened building material (i.e., the component made of the building material). However, even without such agglomeration, the mixture can also have a beneficial effect on the properties of the building material and the components made therefrom. It is worth mentioning that in the past, people often believed that sand, especially desert sand, was not suitable for the production of building materials at all due to its low roughness, very small particle size, and its particle size distribution without larger particles.

[0028] The increased surface area of ​​desert sand and slate caused by grinding also allows the alkaline components of the slate to react with the silica of the desert sand to form silicate hydrates. This can occur during the setting process or post-hardening of components made of building materials (such as concrete), sometimes over several years. The grinding process gives desert sand and slate a larger surface area, so that the alkaline components of the slate and the silica of the desert sand can both come into contact with each other more easily and more frequently as reactants on their respective surfaces.

[0029] The proportion of slate and desert sand in the mixture may be at least 20% each.

[0030] The proportion of slate is at least 20%. It can be at least 30%, at least 40%, at least 50% and up to 80%.

[0031] The proportion of desert sand is at least 20%. It can be at least 30%, at least 40%, at least 50% and up to 80%.

[0032] For example, the mixture may consist of 20% slate and 80% desert sand. Alternatively, the mixture may consist of 30% slate and 70% desert sand. Alternatively, the mixture may consist of 40% slate and 60% desert sand. Alternatively, the mixture may consist of 50% slate and 50% desert sand. Alternatively, the mixture may consist of 60% slate and 40% desert sand. Alternatively, the mixture may consist of 70% slate and 30% desert sand. Alternatively, the mixture may consist of 80% slate and 20% desert sand.

[0033] If the mixture comprises further components besides slate and desert sand, it still preferably contains at least 20% slate and at least 20% desert sand.

[0034] The desert sand included in the mixture may be ground to a particle size of 0.5 mm or less.

[0035] It may also be considered that the desert sand is ground to a particle size of at most 0.25 mm, at most 0.1 mm, at most 0.75 mm, at most 0.05 mm, or at most 0.04 mm.

[0036] Bulk materials with a particle size of less than 0.063 mm are usually no longer referred to as sand, but as powder. The invention therefore also includes embodiments in which slate is ground into slate powder and / or desert sand is ground into corresponding powders.

[0037] The grinding process can be carried out in such a way that the maximum particle size of the desert sand described above also applies to the slate. Alternatively, it is contemplated that the method can be carried out in such a way that larger slate particles are produced. This can be done, for example, by varying the grinding time.

[0038] It may be desirable to consider performing at least two grinding steps. Preferably, the grinding degree in the second grinding step is finer than the grinding degree in the first grinding step.

[0039] The method may also comprise more than two grinding steps, wherein the degree of grinding in each grinding step is preferably finer than the degree of grinding in the previous grinding step.

[0040] It is conceivable here to grind slate and desert sand together in a first grinding step. In a second grinding step, one of the substances, preferably desert sand, can then optionally be added. This is particularly true if the slate particles to be ground are initially significantly larger than the desert sand particles, and the proportion of slate in the grinding device is therefore advantageously as large as possible in the first grinding step.

[0041] It is also conceivable not to add slate or desert sand before the second or any further grinding step, and thus to determine the proportions of the components of the mixture to be ground before the first grinding step.

[0042] Alternatively, one could consider grinding only the slate in the first grinding step and adding only the desert sand in the second grinding step.

[0043] In addition to the above method, the present invention also includes an additive for an adhesive or building material, wherein the additive comprises co-ground slate and desert sand.

[0044] All details and particulars explained with regard to the above method also apply to the exemplary embodiments of the additive and vice versa.

[0045] The present invention further comprises a building material or adhesive comprising an embodiment of the above-mentioned additive. The building material can be selected from the group comprising concrete, mortar and gypsum. The adhesive can be selected from the group comprising cement, lime and pozzolan.

[0046] The invention also includes the use of a mixture of co-ground slate and desert sand as an additive to a binder or building material.

[0047] The present invention also includes an additive for adhesives or building materials obtained by the above method.

Claims

1. A method for producing an additive for an adhesive or a building material, the method comprising the following steps: -Grind a mixture containing slate and desert sand.

2. The method according to claim 1, characterized in that The proportion of slate and desert sand in the mixture is at least 20% each.

3. The method according to any one of the preceding claims, characterized in that The desert sand is ground to a particle size of 0.5 mm or less.

4. The method according to any one of the preceding claims, characterized in that At least two grinding steps are performed, wherein the grinding degree of the second grinding step is finer than the grinding degree of the first grinding step.

5. An additive for an adhesive or building material, wherein the additive comprises co-ground slate and desert sand.

6. A building material or adhesive comprising the additive according to claim 5.

7. Use of a mixture of co-ground slate and desert sand as an adhesive or additive to building materials.

8. Additive for adhesives or building materials, obtained by the process according to at least one of claims 1 to 5.