GRAVITY SEPARATION APPARATUS AND METHOD FOR COARSE COAL SLIME

摘要

Provided is a gravity separation apparatus for coarse coal slime. A spiral separation device is arranged above a spiral generating device. The spiral generating device comprises a base (8) and a vibration exciter (6) arranged in the base (8), and the spiral separation device comprises a columnar spiral external support (3). The top of the external support (3) of a separator is provided with an end cover, and one side of the end cover at the top of the external support (3) of the separator is provided with a feeding port (1). A joint of the bottom of the external support (3) of the separator and the base (8) is provided with a plurality of rubber spring tubes (7). A spiral middle shaft is axially provided at the center of a circle of the external support (3) of the separator, and a top end of the spiral middle shaft is movably connected to the end cover, and a bottom end thereof is connected to the vibration exciter (6). A spiral middle shaft support (4) is provided on the spiral middle shaft in the spiral external support (3). Spiral groove face grooves (5) are provided in the spiral middle shaft support (4) from top to bottom, and a bottom end of each of the spiral groove face grooves (5) is provided with a discharge port (9). A product interceptor is provided in the discharge port (9). Further provided is a method using the gravity separation apparatus for coal slime. The method comprises: feeding coal slime and water, as materials, into the spiral middle shaft support (4) in the spiral external support (3) through the feeding port (1), and separating the coal slime and water materials under the action of gravity; fast layering of material particle groups is realized under the action of the vibration exciter (6); finally, transversal zoning of light and heavy particles is realized on a spiral section of a spiral chute (2) according to a density difference, and a continuous coal slime zone is formed after material layering and zoning are stable; and finally, the product interceptor provided at a discharge end at the bottom of a spiral separator transversely segments the coal slime zone on the section of the spiral chute into three parts, i.e. clean coal, middlings and tailings, and the three parts are discharged through respective discharge ports (9), thereby improving the separation precision.