SU1200980A1 - Method of washing non-metallic minerals - Google Patents

Description

The invention relates to the enrichment of useful materials, mainly for the processing of non-metallic building materials (crushed stone, gravel) and the removal of contaminating clay impurities from them.

The purpose of the invention is to increase the efficiency of the separation of contaminants by separate removal of products pre-wash. YU

FIG. 1 shows an installation diagram for implementing the method; in fig. 2 - area of the jet.

The installation consists of a conveyor 1, an inclined chute 2, a hydraulic monitor 3, 15

screen 4.

The method is as follows.

Non-metallic material with contaminating impurities conveyor 1 is fed into. 20 erosion zone on the inclined tray 2, the angle of inclination of which with the horizon is 10-30 ° less than the angle of repose of the material. A jet of water from the monitor 3 erode the material. 25

The jet of water makes a reciprocating movement across the movement of the washed material, while the speed of movement of the jet in 1.2-1.8 exceeds the transport speed 30 in the washout zone. The meeting angle of the jet with the material is 15-75 °.

Blurred material in a cyclical flow descends on the screening surface of screen 4, whose width at the interface 35 is not less than the width of the tray, therefore the pulp flows of the tray are fed to the corresponding section of the screen of the screen without mixing with one another. The pulp with pollutants at a time of 40 months goes into the under-bed space, and the material is sent to

further processing.

I

At the time of the impact of a jet of water in the erosion zone (shaded area), the material effectively disintegrates, its particles turn over and move, and the clay adhesives are removed from them. Due to the fact that the jet is directed ⁵⁰

towards the flow of material at an acute angle, it impedes the immediate descent of the pulp along the inclined chute, which increases the time of interaction of water with the material and increases the scouring efficiency. When moving the jet from the erosion zone, light particles of 5 contaminants (clay, silt, etc.) are removed most quickly from the water. From the scrub tray 2, they enter the corresponding section of screen 4 and descend into the under-screen space. Large particles fall on the screen with a delay in the environment of cleaner water. The water goes down under the sieve, and the dewatered material enters for further processing.

At the next moment of the impact of a jet of water, the erosion front moves to a neighboring area, where the same process of separate pollutants and material occurs.

In contrast to the known, the method of washing out on the tray of a stationary stream of pulp does not form, but cyclical pulp formation occurs, shifted in time for each point of the washout zone.

Experimentally established. that the effect of cyclic descent of pulp with a leading entrainment of contaminants is provided at the speed of movement of the washout front (Ϋφ) and 1.2-1.8 higher than the feed rate of the material to the washout zone (ν _Μ ). Reducing the speed of movement leads to the ingress of unwashed material into the product, increasing the possibility of mixing the streams of washed material and contaminants, which degrades the quality of the product.

I ·

One of the conditions for the cyclic descent of the pulp is the flow of the jetting jet towards the flow of material at an acute angle (0.15-75 °) to the bottom of the tray. With a larger angle, a sufficient time of interaction of the jet with the material is not ensured; with a smaller angle, the jet does not sufficiently penetrate into the thickness of the material, which reduces the erosion efficiency.

Example. Sand-gravel mixture, clogged with hard-to-break clay and silt, with inclusions of boulders with a diameter of 300 mm, is fed by a belt conveyor to an inclined wash-out tray (width 2000 mm, length 2500 mm, height 2000 mm, tilt angle 23). The material is eroded by a stream of water supplied by a hydromonitor when recruiting 30 MPa and a flow rate of 60 ^mela / h.

The water jet makes a reciprocating movement in the direction perpendicular to the flow at the speed of movement of the erosion front ν _φ =

1200980

four

0.3 m / s and material feed rates I. 'Ί φ

a washout zone ν _Μ = 0,2 m / s (

’M

1.5 ·}. The angle of inclination of the jet in relation to the flow of material is 7-90. The movement of a jet of water is carried out by turning the nozzle of the jetting machine with the aid of an attachment operating in automatic mode. From the scrub tray, the pulp flows by gravity to the vibrating screen, from where the dehydrated gravel is fed for further processing (crushing and screening).

As a result of washing the gravel-sand- _(the mixture with the content of 40% of difficult-to-open clay at.: - ^ = 1.2-1.8 and I (Л _ '

the angle of inclination of the jet 15-750 clay content in the mixture is about 0.2%.

Slow down

erosion front (<1,2) and it increased

(tr- * 1.8) lead to deterioration

product quality due to a significant increase in the content of clay impurities.

The table shows the indicators of washing with various parameters of the method.

} Tilt angle | jet to flow! Ku material, hail. Productivity by product, m ^ / h The clay content in the product,% one 2 3 four 0.8 40 50 1.9 1.1 40 50 1,3 1.2 40 50 0.5 1.5 40 50 '0,5 1.8 40 50 0.5 1.9 40 50 1.2 2.1 40 50 1,3 2.5 40 50 1.6 1.5 7 50 1.5 1.5 ten 50 1.2 1.5 15 50 0.5 1.5 45 50 0.4 1.5 75 50 0.5 ' 1.5 80 50 1,3 1.5 90 50 1.5 1.2 15 50 0.5 1.8 15 50 0.4 1.2 75 50 0.5

five

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6

one 1 ² ! ³ I ‘ 1.8 75 50  0.5 1.2 15 50 0.5 1.8 75 50 0.5 1.8 15 50 0.5 1.8 75 50 0.5 1.2 ten 50 1,3 1.8 ten 50 14 1.2 80 50 1.4 1.8 80 50 15 1.1 15 50 1.4 1.9 15 50 1.4 1.1 . 75 50 1.5 1.9 75 50 1.5

Claims (2)

The method of washing non-ferrous materials, including their transportation to the washout zone, preliminary erosion in the flow with a counter-jet of water making a reciprocating movement across the material flow, and separating disintegrated impurities, in order to increase the efficiency of separating contaminants due to separate removal of pre-wash products, the speed of the jet moving is 1.2-1.8 times the material transportation speed to the washout zone; With material is 15-75 °. 5 C 1200980 4-k Phi1. one one 1200980 2