SU412160A1 - - Google Patents

Description

one

The proposed method can be applied in construction in the preparation of aqueous lime paint compositions, lime mortars and concretes, as well as in enterprises of the building materials industry in the manufacture of carbonated lime building products and structures.

There is a method of improving the process of carbonization of calcium hydroxide in building materials by introducing an additive together with mixing water into the limestone raw mixture.

The purpose of the invention is to increase the strength of the products.

This is achieved by the fact that the solid components of the lime raw mixtures are closed with waste water containing phenol.

On coke-silt shale-chemical production, during the process of pyrolysis of coal or shale, supra-resin and psmol waters are produced, which contain large quantities of phenol.

These phenolic waters can be used to bleed the solid components of lime raw mixes.

Phenol, found in phenolic water, intensively absorbs oxygen and forms carbon dioxide and water in large quantities according to the following reaction:

CeHsOH + 7О2 - бСОС + ЗНгО.

The hardening of lime raw mixtures occurs due to the carbonization of calcium hydroxide (lime), which is one of the main solid components of these mixtures. The process of carbonization occurring during the hardening of lime, occurs by the reaction:

Ca (OH) 2 + CO2 CaCO3-LH20.

The process of carbonization of calcium hydroxide in natural conditions is very slow. The long periods of carbonation of the hydroxide are denoted by the negligible concentration of carbon dioxide in the air.

The process of carbonization of calcium hydroxide proceeds at a moisture content of the lime raw mixture in the range of 5-7%. The carbon dioxide from the air in the lime raw mix is dissolved in the moisture in the mixture and, when reacted with calcium hydroxide, forms calcium carbonate (calcium carbonate). To accelerate the process of carbonization of calcium hydroxide in

building materials need an additional influx of carbon dioxide and moisture in the lime raw mixtures.

The source of the additional portion of carbon dioxide and moisture for the process of carbonization of calcium hydroxide in calcareous

Raw mixtures are phenol introduced into these mixtures in the form of phenolic water.

Phenol produces moisture and carbon dioxide, which are necessary for the carbonization process.

To manufacture building materials from a lime raw mixture, first solid components are mixed into the mixture, which are mixed in a certain ratio (by volume or by weight) until a homogeneous mixture is obtained, and the finished mixture with continuous mixing is closed with phenolic water. Pepolate water is added to the calcareous raw meal mixture until the last specified consistency (working viscosity) is reached.

Example 1. For the preparation of aqueous lime paint formulations (white) take:

Lime paste 50%

humidity2.5 kgr

Phenolic water 10 liters.

Example 2. To prepare mortar mortar, take (by volume): Lime paste 50%

humidity1 h

Sand2 h

Fepolnoe water 3 hours

Subject invention

The method of improving the process of carbonization of calcium hydroxide in building materials by introducing an additive together with a water shutter to the lime raw mixture is characterized in that, in order to increase the strength of the products, the solid components of the lime raw mixtures are closed with waste water containing phenol.