Air-chamber jigger and coal separation method thereof

Abstract

The invention discloses an air chamber jigger and a coal preparation method thereof. The air chamber jigger comprises an air chamber formed by a sealing container with changeable volume and shape; the air chamber is arranged below a screen plate and is connected with a compressed air source by an air inlet valve and with atmospheric air by an exhaust valve; and the air chamber is made of impermeable materials. The coal preparation method of the air chamber jigger comprises the following steps: 1, opening the air inlet valve and closing the exhaust valve; 2, filling the compressed air source in the air chamber by the air inlet valve; 3, swelling the air chamber and raising the water level; 4, closing the air inlet valve and opening the exhaust valve; and 5, under the pressure of water, squeezing the air in the air chamber out and discharged the air to the atmosphere, flattening the air chamber, and dropping the water level. The air chamber jigger and the coal preparation method can avoid the water leakage, and the air discharged from an air outlet pipe is not carried with slime water, thereby improving the stability of the equipment and reducing the environmental pollution; moreover, the even pulsation can be achieved in the width direction of the jigger, and a large-scaled jigger is realized.

Description

Technical field [0001] The invention relates to a coal preparation equipment and a coal preparation method thereof, in particular to an air chamber jig and a coal preparation method thereof. Background technique [0002] At present, the jigs used for coal preparation at home and abroad are as contained in pages 196 to 226 of the book "Mineral Processing" published by China University of Mining and Technology Press in October 2002, and as contained in China Coal Industry Press in 1993. The air pulsation jigs contained in pages 329 to 435 of the "Coal Preparation Handbook" published in April 2009 all use fixed air chambers. Air chamber and composite air chamber, they all use the principle of U-shaped tube, figure 1 The sieve side (side drum type) air chamber jig machine air exerts pulsating pressure from one side of the U-shaped pipe (air chamber side) on one side of the U-shaped pipe, and obtains pulsating rising water flow on the other side (jigging chamber side) , The ris...

AI Technical Summary

Problems solved by technology

If the height of the air chamber is too small, the longitudinal wave height distribution of the sieve plate will be uneven, and the air pressure will be too high, and the air will escape from the air chamber to destroy the bed layer; if the height of the air chamber is too high, the static pressure loss of the water flow will also increase, which will affect the stratification effect ;When the air chamber is exhausted for too long, the air chamber will be submerged or even the water will be discharged. Therefore, the common disadvantage of ordinary jigs is that there must be air and water in contact to form an interface between water and air, so that the air discharged through the exhaust valve Unavoidable coal slime water will cause the air valve to spray water, affect the action of the valve, reduce the reliability of the equipment, and cause environmental pollution; the agitation water flow in the jigging chamber is uneven, and the coal preparation effect is poor

The size of the air chamber in the width direction of the jigging chamber is too large. After the water flows through the air chamber, it goes downward first, then separates upwards and finally merges into one. If the size is too small, the height of the water pulsation is not enough, both of the above two situations will also affect the layering effect

The upper part of the air chamber of the ordinary jig machine is pointed or arc-shaped, and the side wall is upright or arc-shaped. The lower part of the air chamber must be equipped with a herringbone deflector mechanism. Design and manufacture can make the water flow smoother when changing the direction of movement here, so the structure of the jigging chamber is complicated, and it is difficult to design and manufacture

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