RU2114699C1 - Centrifugal separator - Google Patents

Abstract

FIELD: mineral concentration; devices for separation of noble metals and other heavy useful mineral raw materials. SUBSTANCE: centrifugal separator includes, mounted on frame, conical bowl with annular riffles having variable pitch and depth, and drive. Installed in bowl lower part, parallel to its base with clearance ensuring free passage of the most coarse particles of initial material is disc carrying receiving funnel with spacing ribs. Disc is rotated together with bowl on hollow shaft. EFFECT: satisfactory removal of heavy useful components at low rotation speeds and concentrates washing-off without removal of bowl. 1 dwg

Description

 The invention relates to mineral processing, to devices for the separation of precious metals and other heavy useful minerals from mineral raw materials.

 Known centrifugal gravity concentrator, comprising a housing in the form of a conical-cylindrical bowl with a smooth surface and an upper threshold, a drive, loading and unloading devices [1].

 The disadvantage of the hub is a narrowed scale of power fineness (up to 6 mm), a heavier structure for damping unbalanced vibrations, because effective extraction of small particles is carried out in a rapidly rotating bowl (more than 400 rpm).

 The closest to the invention in technical essence is a centrifugal separator for fine-tuning exploration samples, including a conical-shaped bowl mounted on a frame with ring rafts having a variable pitch and a variable depth, and a drive [2].

 The disadvantage of the separator is the narrow scale of the feed size (up to 3 mm), the need to remove the bowl to flush the concentrate, the relatively low extraction of fine particles of precious metals.

 In the proposed centrifugal separator, which includes a conical bowl mounted on a frame with annular arrivals having a variable pitch and a variable depth, and a drive, in the lower part of the bowl parallel to its base, is installed with a gap providing free passage of particles of the starting material, a disk rotating with the bowl on hollow shaft. On the disk there is a receiving funnel with accelerating ribs.

 The use of a disk with a receiving funnel with accelerating ribs located on it allows one to increase the extraction of small particles of noble metals by increasing the kinetic energy of these particles (due to centrifugal forces) at relatively low (up to 160 rpm) bowl speeds. As a result, even small particles of noble metals (due to the large specific gravity) pass through the pulp layer and fall on a conical bowl, where they are held in flutes.

 A rotating disk with a receiving funnel with accelerating ribs located on it allows you to keep the pulp in the bowl during operation of the separators (due to centrifugal forces) and freely release the concentrate through the hollow shaft after the bowl stops. This simplifies separator maintenance and reduces concentrate removal time.

 The drawing shows a centrifugal separator.

 The centrifugal separator includes a conical bowl 2 mounted on the frame 1 with annular flanges 3 having a variable pitch and a variable depth, and a drive 4. A disk 5 is installed in the lower part of the conical bowl 2, rotating with it on the hollow shaft 6. There is a receiving disk on disk 5 a funnel 7 with accelerating ribs 8. The bowl 2 rotates in an annular collection of tail material 9. The concentrate from the corrugations 3 is washed off with water from the sprinklers 10.

 The separator works as follows.

 Rotation from the drive motor 4 through V-belt drives is transmitted to the bowl 2, with which the disk 5 rotates together with the receiving funnel 7 installed on it with accelerating ribs 8. The pulp enters the receiving funnel 7 and is sent to the disk 5. The rotating disk 5 and the accelerating ribs 8 the pulp is thrown onto a conical bowl 2 with annular annularities 3. Since the pulp receives additional acceleration, the process of separating the granular mass by density is activated. Even fine grains of precious metals due to centrifugal forces become weighted and, passing through a layer of pulp, fall on the surface of the bowl, displacing lighter particles from the arrays. A washout stream flushes light minerals from the conical bowl reflexes and carries them into the annular collection 9 of tail material. Particles of heavy minerals are concentrated in the flutes.

 Disk 5 with accelerating ribs 8, throwing the pulp onto the generatrix of the bowl 2, blocks (due to centrifugal forces) the constantly open outlet of the hollow shaft 6.

 After filling the flutes 3, the bowl 2 stops and the concentrate is washed off with water from the sprinklers 10 into a container installed under the hollow shaft 6.

 This position of the separator allows you to remove heavy useful components at low speeds at a high level (up to 100%) and refuse to remove the bowl to flush the concentrate, which allows you to mechanize and automate the removal process.

Claims (1)

 A centrifugal separator, including a conical bowl mounted on the frame with annular arrivals having variable pitch and depth, and a drive, characterized in that in the lower part of the bowl parallel to its base with a gap that allows free passage of the largest particles of the source material, a disk with a receiving funnel with accelerating ribs and rotating together with the bowl on the hollow shaft.