SU1558473A2 - Method of dressing and dehydration of coal - Google Patents

Abstract

The invention relates to the enrichment and dehydration COAL AND MAY BE USED IN tailings flotation and the effluent outlet and water-slurry PRODUCTS SECTOR coal preparation plants. The goal is to increase the efficiency of the process of enrichment and dehydration of coal. FOR THIS, BEFORE MIXING COAL AND OIL, OIL INCREASES AROMATIC COMPOUNDS IN THE AMOUNT FROM 5 TO 10% FROM THE OIL WEIGHT. IN THE QUALITY OF AROMATIC COMPOUNDS USE BENZALDEHYDE @ AND HIS HOMOLOGISTS. Can also be used aromatic ketones @ OF WHERE the R - phenyl radical, R ¹ - phenyl or alkyl radical, or benzoic acid and its homologs @ OR @ monohydric PHENOL and its homologues, OR @ benzoquinone and its homologues. AT THIS, THE DIFFERENCE OF POLARITY BETWEEN THE OIL REAGENT AND OXIDIZED COAL SURFACE HAS REDUCEDLY. This leads to the strengthening of the adhesion bond of COAL-OIL REAGENT. IN THE PROCESS OF MIXING, A REAGENT HYDROPHILIZER AND A MIXING INPUT FROM 2 TO 5 MIN. AFTER MIXING, FLOCULES OUT OF BREED AND WATER ARE GRAVITATED. The selected flocs are granulated in a water medium at a ratio T: F from 1: 1.5 to 1: 2 in the presence of a polymer with a subsequent granule on the network. 5 ZP.F-Ly.

Description

the oil is injected with aromatics in an amount of from 5 to 10% by weight of the oil.

As aromatic compounds

chon

and his

use: benzaldehyde (O / homologues; aromatic ketones of composition where R is phenyl; R1 is phenyl

B-C-B1 I O

or alkyl; benzoic acid O / C and its homologs; monoatomic phenol / OU-He and his homologs; benzoquinone o and him

homologs.

The novelty of the proposed method lies in the fact that aromatic compounds are introduced into the oil reagent from the carbopolarities of the contacting phases. This difference, in turn, is determined by the difference of the electric dipole moments of the molecules of the oil reagent and the coal surface. Consequently, the interaction of apolar reagent molecules with polar oxygen-containing groups in the oxidized areas of the coal surface produces weak adhesive bonds between the coal and oil reagent. The introduction of aromatic compounds with carbonyl, carboxyl, hydroxyl and quinoid groups with a significant dipole moment into the oil reagent makes it possible to drastically reduce the polarity difference between the oil reagent and the oxidized carbon surface, which in turn leads to strengthening of the adhesive bond. Z coal - oil reagent. At the same time, between the surface molecules of the coal and the specified aromatic compounds

nil, carboxyl, hydroxyl 20 in addition to universal dispersion dei quinoid groups in the amount of 5-10%

orientational and induction intermolecular van der Waals forces, as well as chemical nature interactions — hydrogen and donor – acceptor masses of the oil reagent mass; as aromatic compounds use bin

 and its homologs; aron

composition ketones

question-v1 II o

Where

R is phenyl; R is phenyl or alkyl; benzoic acid p / s and its homologs;

-HE

monoatomic phenol / OU-OH and its homologs; benzoquinone O and its homologs.

The introduction of aromatic compounds with carbonyl, carboxyl, hydroxyl and quinoid groups into an oily reagent makes it possible to increase the strength of the adhesive contact of the reagent with coal, especially on the oxidized areas of the mosaic coal surface, represented by various oxygen-containing groups that have significant bonds. The increase in the strength of the adhesive contact of the coal-binder contributes to an increase in the speed of the oil selection process, as well as to a more intensive displacement of water from the coal surface. The enhancement of intermolecular interactions occurs not only at the coal – oil reagent boundary, but also in the reagent itself. This has a decisive influence on the subsequent stage of flocculation. As is well known, the aggregation of oiled coal particles occurs via an autogenesis mechanism due to the interaction of the surface films of the oil reagent. In this case, in the contact zone of the films, the balance of intermolecular forces is restored, and the strength of the forming aggregate is determined by the cohesion of the binding oil reagent. In turn, the cohesion of the reagent is the higher, the stronger the intermolecular interactions in it. Therefore, the introduction of the above aromatic

dipole moment. Widely used in the practice of oil granules -45 compounds “e only increases the strength of the oil of petroleum origin (the adhesive contact of the coal-binder, zut, diesel fuel, etc.) and stony but also contributes to the consolidation of bonds inside the coal The oils are mainly represented by gumming aggregates at the flocculation stage — paraffinic, naphthaic, two-precursors; their destruction in threefold condensed aromatic mixing processes and subsequent ticking (like naphthalene and anthracene) 50 dehydration. Due to this,

avoid sharpening the rock fraction

compounds with a symmetric molecular structure. As a result, their electric dipole moment is almost zero, and the oil reagents themselves mainly act as apolar substances. In accordance with the Debroy rule, which is well known in the theory of adhesion, the debroyn strength of the adhesion contact of a coal-oil reagent is the higher, the smaller the difference

fragments of destroyed floccules, leading to a decrease in the selectivity of the oil selection process.

Thus, the introduction of aromatic compounds with the indicated oxygen-containing groups into the oil reagent increases the efficiency of enrichment and

polarities of the contacting phases. This difference, in turn, is determined by the difference of the electric dipole moments of the molecules of the oil reagent and the coal surface. Consequently, the interaction of apolar reagent molecules with polar oxygen-containing groups on the oxidized portions of the coal surface produces weak adhesive bonds of the coal-oil reagent. The introduction of aromatic compounds with carbonyl, carboxyl, hydroxyl and quinoid groups into the oil reagent, which have a significant dipole moment, makes it possible to sharply reduce the polarity difference between the oil reagent and the oxidized carbon surface, which in turn leads to hardening of the adhesive bond coal is an oil reagent. At the same time, between the surface molecules and the indicated aromatic compounds

In addition to the universal dispersion, orientational and inductive intermolecular van der Waals forces act, as well as chemical interactions, hydrogen and donor-acceptor bonds, arise. The increase in the strength of the adhesive contact of the coal-binder contributes to an increase in the speed of the oil selection process, as well as to a more intensive displacement of water from the coal surface. The enhancement of intermolecular interactions occurs not only at the coal – oil reagent boundary, but also in the reagent itself. This has a decisive influence on the subsequent stage of flocculation. As is known, the aggregation of oiled coal particles occurs by an autohesion mechanism due to the interaction of the surface films of the oil reagent. In this case, in the contact zone of the films, the balance of intermolecular forces is restored, and the strength of the resulting aggregate is determined by the cohesion of the binder oil reagent. In turn, the cohesion of the reagent is the higher, the stronger the intermolecular interactions in it. Therefore, the introduction of the above aromatic

The compounds only increase the strength of the adhesive contact of the coal-binder, but also help to strengthen the bonds inside the coal-oil aggregates at the flocculation stage, which prevents them from breaking down during mixing and subsequent dehydration. Due to this,

fragments of destroyed floccules, leading to a decrease in the selectivity of the oil selection process.

Thus, the introduction of aromatic compounds with the indicated oxygen-containing groups into the oil reagent increases the efficiency of enrichment and

coal dewatering using the oil selection method OVZUMS at all its stages. The introduction of aromatic compounds with carbonyl, carboxyl, hydroxyl and quinoid groups in the oil reagent in an amount of 5-10% by weight of the oil reagent ensures high efficiency of the enrichment and dewatering process for almost the entire range of products for processing

the same coal with reagents introduced into it — soda ash (0.6% by weight of solid) and oil for oiling of the mixture (2% by weight of solid) is mixed in the same mode (2000 rpm) as in the proposed method for 5 minutes The flocs are then separated from the waste in a NOGSh-325 centrifuge.

The research results show that the introduction of a method into the oil binder, reappointment, - flotation waste, 10 gents of aromatic compounds from carotene and waste products, water-slagne, carboxyl, hydroxyl

and quinoid groups can significantly improve the efficiency of the coal enrichment and dewatering process. It's all about the basic way. In addition, an opportunity is created to reduce the time of selection and, consequently, increase the production volume of coal preparation plants.

Example. Under laboratory conditions, the enrichment process is carried out and is dehydrated in reducing the moisture content of the living flotation concentrate on offer (cake) by 2–5%, increasing the ash content to the ground process. The ash content of the solid phase of the selection passages by 5.5-7.5% as compared to the waste is 59.7%, the average grain size is 0-35 µm, the pulp density is 70 g / l. As a hydrophilizing agent of the mineral component of the process apparatuses “OZUMS use soda ash, giving-Analogous results were obtained with

use of alkyl-substituted homologs of these compounds as additives.

Claims (4)

Invention Formula 1. Method of enrichment and dehydration of coal by ed. St. No. 1248661, characterized in that, in order to increase the efficiency of the enrichment process and dehydration, it amounts to 2% of the mass of solid coal 30 before mixing the pulping oil into the pulping phase, bring the aromatic compounds into the raw sludge with soda ash and oil for buttering the mixture put into it the additive is stirred in a contact vat at a rate of L / -l0 impeller rotation speed of 2000 rpm (linear 35 USE benzaldehyde gb with and I am in the amount of 0.6% by weight of the solid in the pulp. As a binder oil reagent, oil was taken for oiling of the charge produced by Avdeevsky 25 KHZ. Before feeding the oil reagent, an aromatic additive — benzaldehyde — is introduced into the pulp in an amount of 7% of the mass of the original oil reagent. Consumption of oil reagent with addition from 5 to 10% by weight of oil. 2. The method according to claim 1, characterized in that as aromatic compounds speed of 6.3 m / s) for 5 minutes. After 3.4 and 5 minutes of mixing, samples are taken and the average diameter of the resulting floccules is determined with a microscope. After 5 minutes of stirring, the product is fed to a LNG-325 centrifuge, which removes floccules from the slurry. The resulting concentrate (cake) is subjected to moisture analysis by the standard method. Solid phase fugate centrihomologi. 3. The method according to claim 1, characterized in that aromatic ketones of composition 40B - C - B are used as aromatics. where R is phenyl; Rx is phenyl or alkyl. 4. The method according to claim 1, wherein fugues (waste oil selection) after 45 that, as aromatics, evaporation of water is analyzed. / 0 ash content. use benzoic acid Enrichment and dehydration by pre- and its homologs. The method is repeated with the addition. The method according to claim 1, wherein in the oil reagent 3,5,10 and 12% benzal- that as aromatic compounds dehyd. Such a series of experiments is carried out on 50 use monoatomic phenol Oy-on each of the proposed aromatic additives. Simultaneously with these experiments on the enrichment and dehydration of coal, the proposed method is used to carry out the process according to a known method, i.e. without entering into the initial oil reagent of the listed aromatic compounds. For this slurry 55 and its homologues. 6. The method according to claim 1, characterized in that as aromatic compounds use benzoquinone Oh and his homologs. the same coal with reagents introduced into it — soda ash (0.6% by weight of solid) and oil for oiling of the mixture (2% by weight of solid) is mixed in the same mode (2000 rpm) as in the proposed method for 5 minutes The flocs are then separated from the waste in a NOGSh-325 centrifuge. The research results show that the introduction of aromatic compounds with carbonyl, carboxyl, hydroxyl and quinoid groups can significantly improve the efficiency of the coal enrichment and dewatering process. This is manifested in a decrease in the moisture content of the concentrate (cake) by 2–5%, an increase in the ash content of the base method. In addition, it is possible to reduce the time of selection and, consequently, increase the breeding output by 5.5-7.5% compared to the duration of the process devices "OVZUMS Similar results were obtained when before the agitation, aromatic compounds in the amount of L / -l0 are introduced into the oil ve from 5 to 10% by weight of oil. 2. The method according to claim 1, characterized in that as aromatic compounds homologs. 3. The method according to claim 1, characterized in that aromatic ketones of composition 40B - C - B are used as aromatics. and its homologues. 6. The method according to claim 1, characterized in that as aromatic compounds use benzoquinone Oh and his homologs.