PL170208B1 - Coiled stream enrichment - Google Patents

Abstract

A coil stream separator equipped with a working trough with a product receiver, characterized in that the side walls of the working trough (1) are provided with openings (3) with filter partitions (4) and partitions (5) for changing the cross-section of the surface of these openings (3).

Description

The subject of the invention is a coil stream separator, especially for enriching fine-grained coals containing a large proportion of high-ash clay fraction.

Coil stream separators, equipped with a working trough with a product receiver, are among the devices used to enrich fine-grained coals in an aqueous medium, under the influence of centrifugal and gravitational forces. The enrichment process yields two or three products: high-ash waste, a semi-finished product that can be added to the concentrate or waste, or can be a separate product, and coal concentrate.

The quality of the concentrate obtained depends on the proportion of high-ash clay fraction (grain size up to 0.1 mm) in the feed to the coiled stream separator. This fraction is transported with the main water stream along the outer cross-section of the working trough during the preparation process, along with the light carbon fraction, separated from the oversize and waste fractions during the preparation process. When the feed to the coiled stream separator contains a large amount of clay fraction, the resulting concentrate is quite heavily contaminated. In this case, the grain classes with the highest ash content must be separated from the feed to the separator, or from the obtained concentrate, for example, through hydraulic classification. This requires the expansion of the technological installation and ensuring appropriate operating conditions.

The aim of the invention is to improve the conditions for upgrading high-silt fine coal grades, i.e. to obtain a low-ash coal concentrate, characterized by a higher concentration of the solid phase in the suspension, which additionally allows for improving the conditions for dewatering the obtained concentrate, for example in vacuum filters.

This goal was achieved using a coil-flow concentrator according to the invention, in which the side walls of the working trough with the product receiver are provided with openings with filtering baffles and baffles to change the cross-sectional area of these openings. These openings are enclosed by receiving boxes, each of which is connected to the main collector.

The design modification of the working trough of the coil stream concentrator, according to the invention, enables direct discharge of the clay fraction during the concentrating process, while gradually thickening the resulting coal concentrate. The clay fraction discharged from the concentrator can be combined with waste or a semi-finished product, constitute a separate product, or serve as feed to the second concentrating stage.

The tables below provide examples comparing the impact of the existing and new coil jet separator solutions on the technological parameters of the enrichment products.

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Table 1

Technological parameters of coal slurry enrichment products in a double coil jet enricher operating without the discharge of the clay fraction

Feed Concentrate Waste Mass flow rate t/h 10 8.5 1.5 Volumetric flow rate m3/h 25 23 2 2 Solid phase concentration kg/m 400 370 -800 Ash content A ^a (%) 30 25 -57

Table 2

Technological parameters of coal slurry enrichment products in a modernized double coil stream enrichment device with clay fraction removal according to the invention

Feed Concentrate Waste Mass flow rate t/h 10 5.5 4.5 i Volumetric flow rate m3/h 25 11 14 Solid phase concentration kg/m ³ 400 500 330 Ash content A ^a (%) 30 17 -46

The subject of the invention is shown in an exemplary embodiment in the drawing, where Fig. 1 schematically shows a fragment of the working trough of the coil stream enricher in cross-section, and Fig. 2 - a diagram of this fragment of the working trough of the enricher in longitudinal section.

The coil stream beneficiator, especially for beneficiation of fine-grained coals containing a large proportion of high-ash clay fraction, has a working trough 1 with a product receiver 2. The side walls of the working trough 1 are provided with openings 3 with appropriately selected filter partitions 4 and partitions 5 for changing the cross-section of the surface of the openings 3. The openings 3 are enclosed with receiving boxes 6, each of which is connected to the main collector 7 for collecting the clay-laden suspension.

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Publishing Department of the Polish Patent Office. Circulation: 90 copies. Price: PLN 2.00.

Claims (2)

Patent claims 1. Coil stream enrichment, equipped with a work trough with a product receiver, characterized in that the side walls of the work trough (1) are provided with openings (3) with filtering baffles (4) and baffles (5) for changing the cross-section of the surface of these openings ( 3). 2. The enrichment agent according to claim 1 A device according to claim 1, characterized in that the openings (3) are enclosed by receiving boxes (6), each of which is connected to the main collector (7).