SU1263329A1 - Method of homogenization of dry and wet mixtures - Google Patents

Abstract

I. THE METHOD OF HOMOGENIZING DRY AND WETTING MIXTURES, including the mixing of components with directional gas flows, characterized in that, in order to increase the productivity and degree of homogeneity of the mixtures, the gas flows are oriented in different planes and introduced them successively in 30-60 seconds in steps mode. 2. A method according to claim 1, characterized in that the velocity of the gas flows in each mixing plane is changed successively in 60-90 seconds by 10-30 m / s with the initial speed of the gas jets 80-200 m / s.

Description

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FIG. 1 The invention relates to methods for the homogenization of dry and wet mixtures and can be used in various sectors of the national economy, namely the food, chemical, and building materials industries. The purpose of the invention is to increase the productivity and degree of homogeneity of the mixtures. FIG. 1 is a diagram of the organization of gas flows; in fig. 2 is a graph of gas flow rate versus mixing time (example 1); FIG. 3 - gas flow arrangement; in fig. 4 — Graph of gas flow rate versus mixing time, (example 2). Example 1. Homogenization of a dry mixture of cement and pozzolanic additive (dust - waste of production of ferrosilicon) at a mass ratio of 10: 1 is carried out in a cylindrical tank for 420 seconds by stirring the mixture successively through 60 seconds stepwise flow in different planes of gas (air). 32 fittings are mounted into the body of a cylindrical container, through which compressed air is supplied at a given speed and direction. The velocity of the gas flows in each mixing plane (Fig. 1) is changed successively in 60 s by 10 m / s with the initial velocity of the gas jets 80-M / s (Fig. 2). In the same homogenizer, the same mixture is homogenized by simultaneously operating for 420 seconds through all nozzles of gas flows at a speed of 320 m / s according to a known method. The degree of homogeneity, as shown by the results of microscopic studies and chemical determination of the content of the pozzolanic additive in the samples of the mixture, is 98% while mixing the mixture according to this method; 75% - while stirring the mixture according to a known method for 600 seconds (from this time stabilization of the degree of homogeneity of the mixture is observed), m / s 63% - while stirring the mixture for 420 seconds. Example 2. Homogenization of a cellular concrete mixture (a mixture of mineral in a live, ground quartz sand and a gasifier) at a humidity of 42% is produced in a mixer by mixing the mixture for 360 with successively operating through 30 s in steps in different planes of gas (air) flows . 35 fittings are mounted into the mixer housing, through which compressed air is supplied at a given speed and direction. The velocity of the gas flows in each mixing plane (Fig. 3) is changed successively through 90 s to 30 m / s with the initial velocity of the gas jets 140-200 m / s (Fig. 4). In the same mixer, homogenization of the same concrete mixture with the same humidity is carried out by simultaneous operation for 360 seconds and 480 seconds through all fittings of gas streams at a speed of 320 m / s according to a known method. The degree of homogeneity, as shown by the results of determining the activity of CaO and the content in the samples of a mixture of quartz sand, as well as the activity of CaO of samples of concrete after autoclave treatment, is 96% when the mixture is stirred by this method, 77% - when mixing the mixture by the known method 480 seconds (from this time, the degree of homogeneity of the mixture is stabilized), 60% - with stirring of the mixture for 360 seconds. Autoclave cellular concrete obtained from the mixture homogenized by the proposed method, with an average density of 656 kg / m, has a compressive strength of 5.2 MPa, and concrete obtained from a mixture homogenized by a known method has an average density of 660 kg / m and strength to compression 4.0 MPa. Thus, the use of the invention allows to obtain concrete with improved physico-technical properties due to the increased homogeneity of the molding mixture.

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Claims (2)

1. METHOD FOR HOMOGENIZING DRY AND WET MIXTURES, comprising mixing the components with directed gas flows, characterized in that, in order to increase the productivity and degree of homogeneity of the mixtures, the gas flows are oriented in different planes and introduced sequentially after 30-60 seconds in a stepwise mode. 2. The method according to η. 1, characterized in that the gas flow rate in each mixing plane is changed sequentially after 60–90 s by 10–30 m / s with an initial velocity of gas jets of 80–200 m / s. FIG. 1 £