RU2553893C1 - Method of grinding and mechanical activation of portland cement - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: method includes connection of a cooling system, supply of energy, supply of a processed product, treatment of the product with ferromagnetic needles, forwarding the treated product to further treatment or to a consumer. For treatment of products they use ferromagnet needles at the following parameters: mass of ferromagnetic needles in the working chamber - 550±10 g; the ratio of the mass of treated portland cement to the mass of ferromagnetic needles - from 1:1.08 to 1:1.12; the ratio of length of the ferromagnetic needle to its diameter l/d = 10 at needle length of 20±2 mm; time of Portland cement treatment - 30±5 s.

EFFECT: increased efficiency of Portland cement treatment, both fresh and with expired shelf life, to increase its activity with minimum duration of activation process.

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Description

The invention relates to the field of building materials and products, in particular to the field of activation of Portland cement by mechanical impact on them, and can be used in construction and other industries using Portland cement.

A known method of processing materials in a reaction vessel (see copyright certificate SU No. 505671 C09J 3/26, published 05.03.76, Bulletin No. 9). The reaction vessel has unequal ferromagnetic bodies, which are affected by a traveling, for example rotating, electromagnetic field. Under the influence of an electromagnetic field, non-equiaxial particles make a complex motion in the entire volume of the reaction vessel: rotation at high speed around its small axis, movement in the radial plane, magnetostrictive vibrations, collisions between themselves and against the walls of the reaction vessel, etc. The oscillation frequency depends on the magnetic field strength, its speed, magnetic properties of the elements, their geometric dimensions, etc. As a result of the effect on the components of the reaction mixture of the complex motion of ferromagnetic bodies located in the electromagnetic field, the substances in the reaction vessel are activated and dispersed.

The closest technical solution is the method of processing materials described in the description of the invention (patent RU No. 2072257 “Vortex layer apparatus”, IPC B01F 13/08, published January 27, 1997), including connecting a cooling system, supplying energy, supplying a processed product, processing the product with ferromagnetic needles, sending the processed product to further processing or to the consumer.

The known method allows you to disperse the processed substances and increase their activity, but does not fully take into account the initial properties of the material and processing parameters in the vortex layer apparatus, which does not allow to achieve a stable, maximum effective effect on the processed material.

The objective of the invention is to increase the degree of processing of Portland cement to achieve a maximum increase in its activity with a minimum duration of processing.

The essence of the invention lies in the fact that the method of grinding and mechanical activation of Portland cement, including connecting a cooling system, supplying energy, feeding the processed product, processing the product with ferromagnetic needles, sending the processed product to further processing or to the consumer, using ferromagnetic needles for processing the product, the following indicators:

- the mass of ferromagnetic needles in the working chamber is 550 ± 10 g;

- the ratio of the mass of processed Portland cement to the mass of ferromagnetic needles is from 1: 1.08 to 1: 1.12;

- the ratio of the length of the ferromagnetic needle to its diameter l / d = 10 with a needle length of 20 ± 2 mm;

- processing time of Portland cement - 30 ± 5 s.

Technical result: due to the introduction of the proposed indicators of ferromagnetic needles, we obtain an increase in the processing efficiency of Portland cement (both fresh and expired shelf life) in order to increase its activity, with the minimum required duration of the activation process.

The proposed method is implemented as follows / The cooler is supplied to the installation cooling system, then the power supply and the processed cement are supplied.

Previously, ferromagnetic needles with a length of 20 ± 2 mm are loaded into the working zone, the diameter (d) of which corresponds to the length (1) in a proportion of 1:10 (l / d = 10). This ratio is optimal for cement in terms of effectiveness and is selected empirically. The optimum mass of ferromagnetic needles for an existing installation is also experimentally selected and amounts to 550 ± 10 g. In this case, the mass of Portland cement simultaneously located in the working zone should provide the ratio of the mass of processed Portland cement and the mass of ferromagnetic needles ranging from 1: 1.08 to 1: 1, 12. Subject to these processing parameters of Portland cement, the optimal processing time is 30 ± 5 seconds. Shorter exposure times do not provide an acceptable amount of activation. With an increase in processing time, the increase in activity is insignificant, therefore, further processing is impractical.

Under the influence of an electromagnetic field, non-equiaxial particles make a complex motion in the entire volume of the reaction vessel: rotation with high speed around its small axis, movement in the radial plane, magnetostrictive vibrations, collisions between themselves and particles of the processed material, its homogenization, etc. The oscillation frequency depends on the magnetic field strength, its speed, magnetic properties of the elements, their geometric dimensions, mass, etc. As a result of the impact on the cement loaded into the installation, the complex movement of ferrimagnetic needles located in the electromagnetic field zone, its activation and significant dispersion occur.

Thus crushed and activated cement is unloaded from the unit and sent for further processing, if it is part of the production line, or sent to the consumer.

This processing method allows both to increase the activity of fresh cement and to intensify the processes of structure formation of materials based on it, and to restore, to almost the original value, the activity of cement with an expired shelf life or stored under inappropriate conditions.

To select the optimal parameters, a series of experiments were performed on the processing of Novorossiysk Portland cement in a vortex layer apparatus. The results are given in the tables.

Table 1 Determination of the optimal mass of ferromagnetic needles The mass of ferromagnetic needles, g The ratio of the mass of the processed material to the mass of ferromagnetic needles The average increase in cement activity,% 500 1: 1 6.1 540 1: 1,08 13.7 550 1: 1,1 14.5 560 1: 1.12 14.0 600 1: 1,2 6.0

table 2 Determination of the optimal processing time for Portland cement with a mass of ferromagnetic needles of 550 g Portland cement processing time, s The average increase in cement activity,% fifteen 10.3 25 14.5 thirty 17.1 35 17,2 45 17.3

Table 3 Determination of the optimal ratio of the length of a ferromagnetic needle to its diameter (l / d) with a mass of ferromagnetic needles of 550 g and a processing time of 30 seconds The length of the ferromagnetic needle, mm The ratio of the length of the ferromagnetic needle (l) to its diameter (d) The average increase in cement activity,% 10 5 7.1 twenty 10 17.1 40 twenty 3,1

Claims (1)

A method of grinding and mechanical activation of Portland cement, including connecting a cooling system, supplying energy, supplying a processed product, processing the product with ferromagnetic needles, sending the processed product to further processing or to the consumer, characterized in that ferromagnetic needles are used for processing the product, with the following indicators:
- the mass of ferromagnetic needles in the working chamber is 550 ± 10 g;
- the ratio of the mass of processed Portland cement to the mass of ferromagnetic needles is from 1: 1.08 to 1: 1.12;
- the ratio of the length of the ferromagnetic needle to its diameter l / d = 10 with a needle length of 20 ± 2 mm;
- processing time of Portland cement - 30 ± 5 s.