SK91095A3 - Method of production of pellet additives for building matters - Google Patents

Abstract

Process for producing granulated additive material for construction material to be mixed with cement and lime, such as cement fluidizer, color intensifier, air pores builder, coloring agents based on inorganic pigments, strengthening components or the like, which are to be admixed into dry, liquid or paste building material, which process can be characterized in that additives or additives in a liquid are mixed with- or suspended in an initial suspension, whilst this initial suspension is then, in the process of granulation and drying, together with a whirling layer sprayed from said initial suspension into nucleus and granulated into an intermediate which is ready to be admixed into the building material.

Description

Process for the production of granulated additives for building materials

Technical field

The invention relates to a process for the production of cementitious or lime-bonded granulated building materials, such as concrete liquefiers, color enhancers, air pore formers, inorganic pigment dyes, strength enhancers or the like, which are intended for dry mixing. liquid or pasty building materials.

BACKGROUND OF THE INVENTION

In the concrete industry, various additives are used in order to change the properties or color of the concrete. By admixing certain additives to the liquid paints, the ability to thicken the concrete can be increased in order to increase the compressive strength and uniform compression of the concrete products. There is an economic advantage associated with reducing the cement content. Better dispersibility of the cement size also results in a more closed surface. Finally, the increased plasticity of the concrete promotes faster filling of the molds and a long service life of the stone molds due to low wear on their walls. Thus, by using various additives and combinations of substances, it is possible to achieve certain application-oriented properties of the concrete and the products made thereof.

However, when combining paints, colored auxiliaries and technologically usable admixtures, it is necessary to take into account the compatibility of these substances. These additives often form chemically unstable solutions, and also by additional admixing of dispersants and chemical stabilizers, the problem of sustained liquid storage stability is increased.

The use of inorganic and organic pigments is already well known in the construction industry for dyeing concrete products, and in particular, inorganic-based pigments have proven to be practical

- 2 coloring pigments. These pigments are added to the concrete mixtures in powder form. Due to the good dispersibility, the pigment powder in the concrete mixture is completely homogeneously distributed within a few minutes.

The disadvantage of using powder pigments is that they do not have good flowability, they often clump and clump when stored, and due to the fine separability of the pigment powder used, more or less severe contamination of the plant, plant and environment must be expected.

It is known to avoid these disadvantages by using pigment granules as coloring agents. Such a process is described in DE 36 19 363, wherein a pigment granulate is a spray-dried mixture of water, pigment and binder. Manganese oxides, iron oxides, organic pigments and / or carbon as well as a mixture of individual pigments are used as pigment. As binders which act as dispersing aids in the concrete, they may be: alkylbenzenesulfonate, alkylnaphthalenesulfonate, ligninsulfonate, sulfated polyglycol ether, melanin-formaldehyde condensates, naphthalene-formaldehyde condensates, gluconic acid, low molecular weight, partially esterified, maleic acid copolymerizates. The proportion of pigments is two to six percent by weight.

The main disadvantage of spray granulation drying is that a hollow space is formed in the center of the granule, due to the technical process. As a result, the strength of the granule is less, so that the granules can be destroyed during transport and storage and the proportion of particles smaller than 0.1 mm can be so large that the flowability of the material can be reduced.

It is known from DE 41 03 531 that, in order to reduce the proportion of particles smaller than 0.1 mm, the granules are spray-dried preferably for 15 minutes to 2 hours, at a temperature of up to 300 mm.

- 3 degrees Celsius pre-granulated in drums, worms or turntables.

The high cost of regranulation considerably increases the cost of production of the pigment granules.

Accordingly, there is a task of providing an inexpensive process for the production of an additive which is characterized by good manufacturing stability, which is easy to use in the mixing process of building materials and which changes the properties of the building material in a desirable way, without substantially affecting other parameters of the building material.

SUMMARY OF THE INVENTION

The solution according to the invention consists in a process of the type mentioned above, in particular in that the additive or additives are dispersed or mixed in a liquid into the initial suspension and the initial suspension is subsequently granulated by granulation granulation into a building-mixable intermediate.

In the process according to the invention, the additives in the liquid are first dispersed in the initial suspension. It is also possible to combine several additives together in the initial suspension in order to vary these additives and the various properties associated therewith in the concrete. It is harmless if these initial suspensions remain stable for only a short period of time, as they are granulated into an intermediate compound miscible in the building material by a subsequent fluidized-bed granulation drying process. This intermediate is virtually unlimited in its granular form with adequate storage. During use, it dissolves completely in the concrete mixing process and does not, for example, alter the flowability of this building material undesirably.

A further embodiment of the invention is contemplated, wherein the initial suspension of the additive having a solids content of 20% to 60% and, in the case of inorganic coloring pigments, to a solids content of 2% to 6% binder is sprayed into fine droplets of germs. in a fluidized bed granulation dryer bed with a material sorting process, at a heat carrier air supply temperature of 150 to 250 degrees Celsius are granulated into granules of 0.1 to 1.25 mm diameter, with a humidity of 0.5 to 5% and continuously through the sorting process. In this case, products in pure form or in a mixture thereof can be used as binders for the granulation of inorganic coloring pigments, suitable as concrete liquefiers.

This starting substance is sprayed by means of a two-cloth nozzle into fine drops onto the embryos which are located on the bed of the fluidized-bed granulation dryer with a material sorting process. At the inlet air temperatures of the heat carrier of 150 to 250 degrees Celsius, granules are formed in the fluidized bed.

The vortex layer operates so that granules with a diameter of 0.1 to 1.25 mm and a residual moisture of 0.5 to 5% continuously exit the vortex layer through the screening process.

The ventilation temperature of the supply air to maintain the fluidized bed and for granulation drying is 30 to 40 degrees Celsius.

The advantages of the method according to the invention for the production of cement and lime-bound building materials, such as concrete liquefier, paint enhancer, air-pore-forming agent, inorganic pigment-based dyes, strength-enhancing components and the like, are by granulation drying with the fluidized bed, a fine-grained end product is produced which is dust-free and which has good pneumatic conveying behavior. Granular colorants and the like can be added to the concrete mixture in exact amounts. In addition, the granules rapidly dissolve in the concrete mixture. The measurements indicate that the dissolution of the granulates and the homogeneous distribution of the additive in the concrete mixture occur in less than 100 seconds. In concrete there is no formation of fibrous dirt and nests with paint.

A further advantage of the method according to the invention is that no hollow granules are formed which are produced by spray drying. Due to the strength and high bulk density of the granules produced. damage, destruction or destruction of the granules and thus the generation of dust are prevented by adequate transport, storage and handling.

Inorganic coloring pigments based on metal and carbon oxides, preferably iron oxides, which are processed into a suspension with water and binder, are preferably used as starting materials for the production of the granular colorant for coloring building materials. The initial colorant suspension comprises 40 to 60% solids content, to solids content, 2 to 6% binder.

DETAILED DESCRIPTION OF THE INVENTION

The process according to the invention is explained in more detail by way of an example of its embodiment.

For the production of granulated building coloring dye, SO% dry red iron oxide (Bayferrox 130), 3% 1 igninsulfonate, and 1% Optapix AC 95 with water added is the colorant starting material, with binder additive data based on solids content substances.

This initial slurry is sprayed into fine droplets onto the embryos which are located on the bed of the fluidized bed granulation dryer with a material sorting process. At temperatures of the air carrier of the heat carrier at 160 degrees Celsius, granules are formed and the material is dried in the fluidized bed. The temperature of the temperature. .. · *

- 6 vented air is 35 degrees Celsius.

The finished granules are discharged by a grading process from a fluidized bed granulation dryer. The moisture content of the granules produced is 1% and the grain size is between 0.1 and 1.0 mm. The granules are dust-free and have a high bulk density. When added to the concrete mixer, the granules were completely dissolved and homogeneously distributed in the concrete mixture within 100 seconds.

Claims (5)

Patent claims CLAIMS 1. A process for the production of granulated cement and lime-bound building materials, such as a concrete liquefier, a color enhancer, an air pore-forming agent, inorganic pigment-based dyes, strength enhancers or the like that are intended for dry-mixing, liquid or pasty building materials, characterized in that the additive (s) is dispersed or mixed into the starting slurry in the liquid, and that the starting slurry is granulated into a building-mixable intermediate by the following fluidized bed granulation drying process. Method, in particular according to claim 1, characterized in that the initial suspension of the additive having a solids content of 20% to 60% and, in the case of inorganic coloring pigments, referred to a solids content of 2 to 6% binder, is sprayed into fine droplets on the embryos found in the bed of a fluidized bed granulating dryer with a material sorting process, at the temperature of the inlet air of the heat carrier at 150 to 250 degrees Celsius are granulated into granules 0.1 to 1.25 mm in diameter with moisture 0.5 to 5% and are continuously distributed by the screening process. Method according to claim 1 or 2, characterized in that the binders used for the granulation of inorganic coloring pigments are products in pure form or in a mixture thereof, suitable as concrete liquefiers. Method according to one of Claims 1 to 3, characterized in that the exhaust air temperature of the fluidized bed granulation drying is 30 to 40 degrees Celsius. Method according to one of Claims 1 to 4, characterized in that the additive or admixture is an inorganic coloring pigment based on metal oxides and / or plastics.