SU1326323A1 - Method of preparing a mixture of loose materials - Google Patents

Abstract

The invention relates to the processing of bulk materials and can be used in chemical, food and other industries for the preparation of homogeneous compositions, primarily from bulk materials with particles of different density and size. The invention provides improved quality of the mixture. The method of preparing a mixture of bulk materials is that the starting components are loaded into a working mixer, for example a drum, evenly along its length in order of increasing bulk density or decreasing particle size, and the load time of individual components is proportional to the entire material contained in the mixer. the time of loading of this component, and the intervals between the downloads of individual components, starting from the second, are proportional to the volume of material in the mixer, tightly m and m size particles loaded. (L

Description

The invention relates to the processing of bulk materials and can be used in the chemical, food, pharmaceutical and other industrial sectors for the preparation of homogeneous compositions mainly from bulk materials with particles of different density and size.

The purpose of the invention is to improve the quality of the mixture.

Example 1. A mixture of four components is prepared. A1 - granulated silica gel, particle diameter d 4 mm, bulk density, 419 kg / m. A2 - granulated polyethylene, 5 mm, 5 517 kg / m. A3 - granulated urea, d | 1 mm, f 665 kg / m. A4 - metal balls, mm kg / m.

The components are loaded into a rotating drum with a volume of 0.01 m in a ratio of 1: 1: 1: 1, the volume of each component is 0.0006 m3.

Components are loaded in order of increasing densities and particle sizes, i.e. A1 + A2 + AZ + A4.

The loading time of individual components, starting with the second, composition 1s,, 2s.

3c.

The smallest inhomogeneity coefficient, 8%, was obtained with a total mixing time of 140 s. At the same time, the time between loading components A2 and A3; A3 and A4 Ы 65

with.

20 seconds passed from the moment of loading the fourth component to the end of the mix.

According to the claims, the values tjj and can be calculated according to the following dependencies

-23

34

Explanation to the numerator of dependence (1). When the second component was loaded in the mixer there was one bulk material, this explains the presence of 1; the closer the ratio of densities to one, i.e. the smaller the tendency of components to segregate, the longer the time must pass between loading the components A2 and A3. in order for component A2 to mix with

this means availability; the closer the ratio and d ,, to one, the

more time will be required to mix components A1 and A2 — this is cidi.

It does not have a π-ry ratio. Analagic

but one can explain the structure of the denominator. According to (1), two unknowns and for finding them we go / use the results of the experiment, namely

 J.} 2.1 34

jointly (1) tj, 66.19 s.

 120 s (2) and (2) we find

23

53.8.

Comparison with experimental data shows that the discrepancy between the experienced

Even values do not exceed 2.5%.

Example 2. Mixed components - granulated polyethylene with a bulk density of 517 kg / m

In this case, loading is not possible.

to organize in the order of increasing densities (densities are equal) here comes into force only the second condition of the formula of the invention — in the order of reducing the particle size.

Loading order A1 + A2-I-A3 + A4.

Load time of individual components J j 1s; t, 3s. Volumes and ratios of components as in the first example. The smallest heterogeneity coefficient of 6% was obtained with a total mixing time of 165 s. In this case, the time between loading components A2 and A3; A3 and A4 - g 90 s. 25 seconds passed from the moment of loading the fourth component to the end of the mix.

The calculated values of j jj and fj can be determined as in example 1

55

,

, 1 s).

The discrepancy is 4.5%. Example

settlement

3. A1 - vanny polyethylene, d, mm, ft

517 kg / m; A2 - granulated silica gel, dj 2 mm, (419 A3 - granulated polyethylene, d.1.5 mm; A4 - granulated in; Polyethylene mm.

In this case, if you load in the order of increasing densities, you need to load the components At, A3, A4, and then A2, but then the condition for reducing the particle size will not be fulfilled, so the second condition, reduction

 particle sizes.

Port loading A1 + A2 + AZ + A4

.one

with;

t, 2

Loading time f- 1 g

1 J s.

The smallest inhomogeneity coefficient of 8% was obtained with a mixing time of 160 s. 0 s; tj 95 s. 25 seconds from the moment A4 was loaded until the end of the mix. Estimated values 1 37c

WITH

J5

3

97.8 s. The discrepancy is calculated

and experimental values of 8%.

, With other ratios of load time and time between downloads Compiled by T. Kruglov Editor I. Segl nik Tehred A. Kravchuk. Proof-reader I. Erdeyi

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Order 3220/6 Edition 565 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Design, 4.

MI of individual components obtained a mixture of inferior quality, with a coefficient of heterogeneity greater than 10%. Using the known method, it was not possible to obtain mixtures with an inhomogeneity coefficient less than 15%.

Claims (1)

Invention Formula The method of preparing a mixture of bent materials, including the dosing of the starting components, the sequential loading of these components and the unloading of the finished mixture, characterized in that, in order to improve the quality of the mixture, the components are loaded in order to increase the densities and / or reduce the particle size in the working mixer, at the same time, the loading time of individual components is proportional to the volume of the material contained in the mixer to the loading moment of this component, and the time between loading of individual components, starting with orogo, prop ortsionalno volume of material contained in the mixer, m densities and size of particles loaded.