RU2187380C1 - Floatation machine aeration unit - Google Patents

Abstract

FIELD: mining industry; units for flotation of materials; metallurgy; food-processing industry and other industries. SUBSTANCE: proposed aeration unit has bladed stator and bladed impeller located at spaced relation and air supply unit. Impeller is made in form multi-tier structure: each tier consists of concentric rings with blades located in between them. Each higher tier exceeds lower one by 1.10 to 1.75 times; stator is made in form of stepped structure following the contour of impeller axial section. Adjustment of clearances between respective members of impeller and stator blades may be effected due to movable members of stator. EFFECT: enhanced efficiency of flotation due to universality of impeller and stator in using floatation machines of various standard sizes, as well as in floatation of materials possessing different physical properties. 1 dwg

Description

 The present invention relates to the mining industry, and in particular to devices for flotation of materials, and can be used in metallurgical, food and other industries.

Known aeration site of the flotation machine / 1 /, containing an impeller made in the form of a truncated hollow cone connected with a hollow shaft for air supply with protrusions on the side surface, containing in the upper part a disk with a central hole and radial blades, a blade stator separated by a disk with a central a hole on the lower and upper parts, and the impeller is installed in the hole of the stator disk with a gap, while the impeller disk with radial blades is located above the stator disk,
A device for aeration of flotation pulp / 2 /, including an air distribution pipe with holes and an impeller mounted on it, consisting of radial blades mounted between the upper and lower disks with holes for suctioning the pulp. The openings of the air distribution pipe are arranged circumferentially in the interdisc space.

 The disadvantage of these devices is the low capacity for dispersion and saturation of the pulp with air due to the absence of a stator aeration unit in the device. In addition, the absence of a stator leads to excessive spinning of the pulp.

 The closest analogue is the aeration unit of the flotation machine / 3 /, containing an impeller, an air supply device and a blade stator, the gap between the stator and the upper impeller base being 0.03-0.08 of the diameter of the upper base of the impeller, and the distance between the inner edges of adjacent blades the stator is 3-5 gaps between the stator and the upper base of the impeller.

 When the impeller rotates, the pulp is sucked between the impeller and the stator and is ejected by the impeller blades onto the stator. Air enters the pulp from the lower base of the impeller, rises up the surface of the impeller, dispersing on its protrusions. Further air dispersion occurs at the edges of the stator blades.

 The disadvantage of this aeration unit of the flotation machine is the low efficiency of flotation due to the inability to adjust the technological gaps of the impeller and stator.

 The objective of the invention is the creation of an aeration unit of a flotation machine that increases the flotation efficiency due to the versatility of the impeller and stator when using flotation machines of several sizes, as well as when flotating materials with different physical properties.

 The problem is solved in that in the known aeration unit containing a blade stator, a blade impeller with a gap between them and a node for supplying air, the impeller is made in the form of a multi-tiered structure, each tier of which consists of concentric rings between which the blades are placed, each higher tier more than 1.10-1.75 times lower, and the stator is made in the form of a stepped design, repeating the contour of the axial section of the impeller, and the adjustment of the gaps between the corresponding elements of the impeller ra and stator blades is possible due to the movable elements of the stator.

 The correct choice of the number of tiers of the impeller and the stator, as well as the ability to control the relative positions of the elements of the impeller and the stator, allow you to set the optimal operating mode of the aeration unit for a particular type of pulp, which ultimately leads to an increase in the extraction of useful products.

 So, when disconnecting the upper tier of the impeller and the upper row of stator elements, an aeration unit is obtained for a smaller size of the flotation machine. When an additional tier is added to this impeller, and an additional row of blade elements is added to the stator, an aeration unit is obtained for a larger size of the flotation machine, respectively.

 The gaps between the stator and impeller elements can be adjusted by providing the ability to move the stator elements to obtain optimal parameters in specific operating conditions of the aeration unit.

 The drawing shows a General view of the aeration unit.

 The aeration unit contains a stepped blade stator 1 and an impeller made in several tiers. Each tier of the impeller consists of two concentric rings 2, between which are placed the blades 3. The impeller is mounted on a hollow shaft 4, through which air is supplied. Air can be supplied both into the space under the lowest ring of the impeller, and directly into the zone of any tier through special openings. To engage in the process of dispersion of the upper layers of the pulp in the rings of the impeller made windows for suction. The gaps between the respective elements of the stator and impeller blades are regulated by moving the movable elements of the stator using bolts 5. On the lower surface of each ring there are protrusions and depressions 6.

 Aeration unit flotation machine operates as follows.

 When the impeller rotates, the pulp penetrates into the space between the rings of each tier through the holes located between the corresponding ring and the shaft. Pulp suction is carried out due to the formation of a discharged space between the rings due to the rotation of the impeller blades. Air into the pulp comes from the lower base of the impeller and from the holes in the shaft in the interdisc space of each tier.

 Preliminary dispersion of air occurs on the protrusions and depressions 6 located on the lower surfaces of the rings 2. Then the air is dispersed on the impeller blades 3 and the dispersion on the edges of the stator blades ends. Air bubbles trap useful mineral particles and raise them to the surface.

 The adjustment of the gaps between the impeller and stator blades allows you to set the optimal operating mode of the aeration device depending on the physical properties of the pulp and the product being enriched.

 The present invention improves the flotation efficiency due to the versatility of the impeller and the stator when using flotation machines of several sizes, as well as the flotation of materials with different physical properties.

Sources of information taken into account
1. RF patent 2095154, 1993

 2. USSR author's certificate 1554974, B 03 D 1/14, 1988

 3. RF patent 2095155, B 03 D 1/14, 1993.

Claims (1)

 Aeration unit of a flotation machine containing a blade stator, a blade impeller with a gap between them and an air supply unit, characterized in that the impeller is made in the form of a multi-tiered structure, each tier of which consists of concentric rings, between which the blades are placed, each higher tier being larger downstream 1.10-1.75 times, and the stator is made in the form of a stepped structure, repeating the contour of the axial section of the impeller, and the adjustment of the gaps between the corresponding elements of the impeller and the lob The stator is possible due to the moving elements of the stator.