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INVENTION
Russian Federation Patent RU2281970

How to prepare coal-water slurry

How to prepare coal-water slurry

Name of the inventor: Leonov Andrey M. (RU); Bychev Mikhail I. (RU); Petrova Galina Ilinichna
The name of the patentee: North Mining Institute. NV Cherskogo SB RAS
Address for correspondence: 677018, Yakutsk, Republic of Sakha (Yakutia), Str. Lenin, 43, IGDS
Starting date of the patent: 2003.12.02

The invention relates to a coal processing industry, in particular to the preparation of coal-water slurry. Essence: selected particle size distribution of the dispersed phase - coal particle size 63-250 microns. Stir UHL with water. To the resulting suspension affect the permanent magnet field intensity 19,5-21,9 A / m. Technical result: reduction in viscosity.

DESCRIPTION OF THE INVENTION

The invention relates to a coal processing industry, in particular to the preparation of coal coal-water slurry (MAS) with desired rheological characteristics.

The aim of the present invention is to reduce the dynamic viscosity of MAS by the field of the permanent magnet without the addition of various chemical additives.

The magnetic treatment existing technologies used for the preparation of drilling fluids, which are clay-based aqueous slurry (10 wt.%) On drilling rigs. In this magnetic treatment is carried out by an alternating magnetic field frequency 24,7-25,3 Hz and intensity of 234-250 A / m, the exposure time 4:00 [AS USSR 1752919, cl. E 21 21/06. A method for preparing a washing liquid. / L.P.Semenihina, V.D.Shantarin, V.I.Semenihin (USSR). - 4 p .: silt].. In the method [USSR patent 1797643, cl. E 21 31/06. A method for preparing a washing liquid / V.D.Shantarin, L.P.Semenihina, V.I.Semenihin (USSR). -. 4 p .: silt] conditions of the above method combined with a constant magnetic field intensity equal to 30-32 units of intensity of the vertical component of the magnetic field of the Earth, and the exposure time is reduced to 15 minutes. The maximum effect (reduced plastic viscosity) of the magnetic treatment in both methods of 35.9 and 34.7% respectively.

These methods relate to the preparation of suspensions of clay, which due to their rheological properties, are fundamentally different from coal suspensions.

A method for the preparation of coal-water slurry with the selection of particle size distribution of the dispersed phase of the suspension [Korochkin GK, Murko VI, pack VA, Gorlov EG, Golovin GS Improving the technology of coal-water slurries. // Solid Fuel Chemistry - 2001. - №3. - S.13-28].

The method of preparation of coal-water slurry in which the dynamic viscosity reduction is selected as the analogue is achieved as a result of its membership of various chemical additives [Korochkin GK, Murko VI, pack VA, Gorlov EG, Golovin GS Raw materials for the preparation of highly concentrated coal-water suspensions in relation to ugleprovodu Belovo-Novosibirsk. // Solid Fuel Chemistry - 2000. - №3. - S.83-93].

The essence of this method of preparation of coal-water slurry is that the dynamic viscosity decrease CWS carried out in 2 stages. In the first step the selection of size distribution of the slurry are introduced at the second additive. In this sodium humate additive in an amount of 1% by weight of dry coal to reduce the viscosity by 25%, while in the case of lignin-alkaline reagent (USCHR) by 39%. By increasing the concentration of additives (over 1%) is an increase in the dynamic viscosity of the suspension. In this technology, the optimum concentration of additives found at which maximum viscosity reduction VSL. Further reduction of the viscosity of the suspension requires a change in particle size distribution of the dispersed phase of the IGC, which is associated with additional costs.

The described methods of preparation of the suspension does not allow to promptly adjust the dynamic viscosity, ie, there is the possibility of increasing or reducing the viscosity of the IGC without additional processing steps associated with a change in the dispersed phase or the concentration of additives in the IGC.

The essence of the method of preparation of the IGC is that carried out the selection of particle size distribution of the dispersed phase - coal particle size 63-250 microns, coal mixing with water and the impact on the suspension constant magnetic field strength 19,5-21,9 A / m with the achievement of sustainable values viscosity of 420-150 seconds from the start of exposure, ie, depending on the particle size, the further the exposure does not change the established dynamic viscosity. As a result, the dynamic viscosity is reduced by 7,8-51,7%.

The problem to be solved by the proposed method aims:

- Exclude from the slurry preparation process of the introduction of expensive chemical additives.

The features used to characterize the process:

- The field strength of the permanent magnet 19,5-21,9 A / m;

- Exposure time 420-150 sec.

BRIEF DESCRIPTION OF dRAWINGS

1. Driving device for determining the effect of a magnetic field on the viscosity of coal-water slurry.

1 - the permanent magnet;

2 - glass;

3 - magnetic field lines;

4 - rotational viscometer Viscotester VT-02;

5 - tripod.

2. Changing the dynamic viscosity of a 50% slurry of time without and under the influence of a magnetic field of 200-250 microns for a class of coal.

3. Changing the dynamic viscosity of a 50% slurry of time without and under the influence of a magnetic field of 160-200 microns for a class of coal.

4. The change in time of dynamic viscosity 50% slurry with and without the magnetic field under the influence of 100-160 microns for a class of coal.

5. The change in time of dynamic viscosity 50% slurry with and without the magnetic field under the influence of 63-100 microns class coal.

6. The change in time of dynamic viscosity 55% slurry with and without the magnetic field under the influence of 200-250 microns for a class of coal.

7. The change in time of dynamic viscosity 55% slurry with and without the magnetic field under the influence of 160-200 microns for a class of coal.

8. The change in time of dynamic viscosity 55% slurry with and without the magnetic field under the influence of 100-160 microns for a class of coal.

9. The change in time of dynamic viscosity 55% slurry with and without the magnetic field under the influence of 63-100 micrometers for the class of coal.

As the magnetic field source used permanent magnet 1 (Figure 1) with the magnetic field intensity H equal to 20.7 ± 1.2 A / m. For the preparation of the suspension was taken stone Neryungri thermal coal deposit with ash A d = 12,5%, moisture W a = 0,4% and a yield of volatile substances V daf = 19,0%.

The suspension was placed in a glass 2, which was mounted on the magnet so that the magnetic field lines 3 fully worked on suspension.

Viscosity measurements were carried out by rotary viscometer 4 Viscotester VT-02, attached to a tripod 5.

coal grinding for preparation of coal-water slurry was carried out by two-stage grinding. In the first step the starting coal was ground on a jaw crusher to a class - 3 mm, and then milling was performed on a planetary mill for 45 sec. From the resulting carbon by wet sieving allocated classes: 200-250, 160-200, 100-160, 63-100 microns.

We were prepared two kinds of suspensions of single-component: a solids content of 50 and 55%. They are prepared by mechanical mixing of coal class with the liquid phase (dispersion medium) as that distilled water was used.

To determine the effect of magnetic field on the viscosity properties of viscosity measurements were conducted during the MAS 300, 300, 420 and 540 in suspensions prepared from classes of coal size: 200-250, 160-200, 100-160, 63-100 microns, respectively. At the same time, the minimum of the magnetic field in order to achieve a sustainable effect of reducing the dynamic viscosity of the IGC on the above classes is 150, 150, 300 and 420. After the lapse of this time, the dynamic viscosity of the IGC remains constant.

For comparative data were measured in parallel slurry viscosity without the influence of the magnetic field. MAS viscosities and its variation without and under the influence of the magnetic field are shown in the table and fig.2-9.

Technical and economic or other efficiency.

Using the proposed method for preparing a coal-water slurry when compared with existing methods provide the following advantages:

a) the ability to achieve the desired dynamic viscosity of CWS by controlling the magnetic field strength;

b) eliminating the need for the introduction of costly additives thinners to reduce the dynamic viscosity of the IGC;

c) the possibility of preparing a coal-water slurry of coal larger classes (200-250 microns).

CLAIM

A method for preparing a coal-water slurry, which consists in selecting the composition of the dispersed phase particle size - coal particle size 63-250 microns, coal mixing with water, wherein the slurry to affect the permanent magnet field intensity 19,5-21,9 A / m.

print version
Publication date 07.01.2007gg