The flotation machine
(57) Abstract:The flotation machine can be used in the purification of water from petroleum products, oils, fats, proteins, surfactants and detergents. The flotation machine contains a rectangular body with a pair of parallel walls between which is placed a perforated pipes for the supply of the water-air mixture, the mechanism for removal of foam from the foam chamber and the output node waste water with the receiving pocket. Pair of parallel partitions are made with ledges-reflectors, the plane being located above the perforated pipes and perpendicular to the axes of the holes of the latter. You can perform reflectors on the walls in the form of wedges or truncated wedges, bottom face which is perpendicular to the axes of the holes in the pipes and bases combined with plane partitions. The result of the invention: improvement of the cleaning effect of water due to more small air bubbles and uniform saturation of their treated water. 2 C.p. f-crystals, 3 ill. The invention relates to a device for water treatment, industrial and domestic wastewater and is intended for removal of proteins, fats, oil, surfactants, detergents and other similar impurities.
Mogilny case with located inside a pair of parallel walls, between which is placed the pipelines to supply water-air mixture, the hydrocyclone to the filing of the original water. From the lateral sides of the housing, a device for receiving froth product and purified water. The top has a mechanism of removal of the foam.The disadvantage of the flotation cell is low, the effect of treatment with high content of impurities in the source water, large dimensions, the inability to control the process when changing the water pollution.The closest analogue to the technical essence and the achieved result is a flotation cell along.with.1212962, MKI C 02 F 1/24. This flotation machine contains a rectangular body with a pair of parallel walls between which is placed a perforated pipes for the supply of the water-air mixture, the mechanism for removing foam c a foam chamber and the output node waste water with the receiving pocket. The treated water with air under pressure supplied in perforated pipes, and then with great speed flows through two rows of holes in the direction of the walls and up. The axis of the holes of each series is aimed toward the nearest pair of walls at an acute angle to its plane. The result of moving the ear. Incomplete use of the kinetic energy of the liquid jet on the fragmentation of the gas bubbles is the main shortcoming of the flotation cell. Further, the liquid located between the parallel walls, due to the energy of the jets and the difference of the densities of the water-air mixture located between the parallel walls, and water, poor air bubbles, the remaining volume of the flotation machine, moving up and poured out under the water level above the upper edges of the partitions.Another significant disadvantage of this design of the flotation machine is the uneven distribution of the gas phase in the liquid volume enclosed between the partitions. After hitting a jet of water-air mixture on the partition the mixture spreads over its surface. The bulk of bubbles when it focuses directly on the walls. This effect causes an uneven saturation bubbles of fluid flow coming from below into the volume between the partitions, and consequently, reduces the degree of water purification. Concentration stratification of the fluid can cause the buoyancy force acting on the volume of liquid with a large number of small bubbles. In the result of the odes, requiring greater air flow.The task is to improve the cleaning effect of water due to more small air bubbles and uniform saturation of their treated water volume.This object is achieved by executing each of the pair of parallel walls with ledges-reflectors, with the plane of the ledge should be located above the perforated pipes enclosed between a pair of parallel walls, and perpendicular to the axes of the holes of the latter.You can perform each of the pair of parallel walls with a reflector in the farm of a truncated wedge or wedge, with the base of the wedge or truncated wedge combined with the plane of the partition, and the plane of the lower side face of the wedge or truncated wedge perpendicular to the axes of the holes of the perforated pipe, concluded between the said parallel walls.The implementation of each of the pair of parallel walls with ledge-reflector, the plane of which is located above the perforated pipe and perpendicular to the axes of the holes of the latter, or a reflector in the form of a wedge or truncated wedge, the base of which owls the data pipeline, allows you to get the bubbles are much smaller. Size formed in turbulent fluid flow of the bubbles depends on the strain rate of the fluid. When the interaction of the jet of fluid with a barrier speed of deformation of the liquid maximum when the leakage jet into a barrier at a right angle. Therefore, when the leakage jet water-air mixture in the plane of the ledge at right angles to the size of the bubbles formed will be maximal for the given initial speed of the expiration of the jet.The performance of walls with ledges-reflectors also allows more evenly saturate rising volume between a pair of parallel walls of the fluid with air bubbles.After hitting a jet of water-air mixture on the plane of the ledge-reflector it spreads over the surface plane and moves to the edge of the ledge. Next, the air / water mixture falls off the ledge and fan overlaps the space between the parallel walls, saturating the entire volume of the rising liquid in small vials.The essence of the invention is illustrated by drawings:
Fig.1. General view of the flotation cell, a pair of parallel walls which are executed with the ledges-triatheletes, made in the form of a wedge.Fig. 3. Detail of the General form of a flotation cell having a pair of parallel walls with ledges-reflectors in the shape of a truncated wedge.The flotation machine contains a rectangular housing 1 (Fig. 1), inside which there are pairs of partitions with 2 ledges-reflector 3. For the supply of the water-air mixture in the flotation machine between the partitions 2 are perforated pipes 4. The plane of the ledge-reflector 3 of each partition is located above the perforated pipe 4 and is perpendicular to the axes of the last 5 holes. On the external side of the housing 1 is attached to the foam chamber 6 with a pipe 7 to remove the foam product and the receiving pocket 8, associated with the drainage system 9 of the flotation machine. The receiving pocket 8 has a gate valve 10 serving to maintain a constant water level in the casing 1, and the pipe 11, which serves for removal of the treated water. Flat bottom of the housing 1 is made with an inclination in the direction of the receiving pocket 8. In the bottom of the case includes a pipe 12 to remove nestacionarnyh impurities. Above the housing 1 has a mechanism for removing foam 13.In other embodiments, a pair partitions 2 (Fig.2, figs.3) above perfo. ignie faces of the reflectors in the form of a wedge (Fig. 2) and in the form of a truncated wedge is perpendicular to the axis 5 of the holes of the pipeline 4.The flotation machine works as follows. The source water is mixed with air and the initially formed water-air mixture under pressure through the supply pipe is directed to the perforated pipes 4 (Fig.1). The air / water mixture with a high speed flows out from the holes of the pipes 4 and in the direction perpendicular to the planes of the ledges 3. Upon impact the air / water mixture on the plane of the ledges 3 narrowing of air bubbles. Due to direct blow air jets on the plane of the ledges reflector 3 is formed in a range of sizes of the bubbles are much smaller compared to the range of sizes produced in the flotation machine is the similar. Significantly increases the rate of dissolution of oxygen due to the more developed the interface and increased capillary pressure of the gas in the bubbles.After hitting a jet of liquid with small bubbles filling the plane of the ledges 3. Part of the liquid moves down to the partition walls 2, and the other part moves up to the edge of the ledges-reflectors 3, where its breakdown. The breakdown of water-air mixtures is nominee saturation rising from the bottom of the liquid stream of small bubbles. Further, the thread due to the energy of motion of the jet and the difference of the densities of the water-air mixture between the partitions 2 and water, poor air bubbles, the main volume of the housing 1, rises and flows out under the water level above the upper edges of the walls 2. During flow, the formation of flotation complexes bubble-particle pollution. When the spout stream is divided into two parts and changes its direction to the opposite. The movement of water in the immediate vicinity of its level in the flotation cell creates favorable conditions for allocation loaded bubbles in the foam layer. The removal mechanism of foam 13 she is transported into the foam chamber 6 and is removed by gravity through the pipe 7. Freed from the main mass of bubbles, the flow moves down between the pairs of partitions 2. Part of the stream again enjoys in the space between the partitions 2, where re-cleaning cycle. The other part of the stream reaches of the drainage system 9, and then flows into the receiving pocket 8, where it is transferred through the gate 10. The lifting and sinking of the gate 10, the water level in the casing 1 is output to the desired height. After the overflow through the gate 10 water is removed through the pipeline 11. Another part of the liquid from nesflaten is with a pair of parallel walls, between which is placed a perforated pipes for the supply of the water-air mixture, the mechanism for removal of foam from the foam chamber, the output node waste water with the receiving pocket and ledges-reflectors in the shape of wedges and are spaced pair of parallel walls above the perforated pipes, characterized in that the bottom face of the wedge is perpendicular to the axes of the holes of perforated pipes.2. The flotation machine under item 1, characterized in that the wedges are made truncated.3. The flotation machine under item 1 or 2, characterized in that the base of the wedge or truncated wedges combined with plane partitions.
FIELD: mining industry; metallurgy; food and other industries.
SUBSTANCE: the invention concerns to the devices for a flotation of materials and may be used in mining, metallurgical, food and other industries. The technical result is decreased power input at maintaining a high quality of dispersion, and increased productivity of the machine. The flotation machine contains a chamber and an aeration unit consisting of a stator and an impeller mounted in respect to each other with an axial and a radial clearance. In the upper part of the impeller on blades there is a ring-type element, the width of which is more than 1/2 lengths of a blade of an impeller. The internal diameter of the ring is equal to the diameter, which forms an internal butt surface of a blade of the impeller, and above the ring-type element there is the circulation pipe.
EFFECT: the invention ensures a decrease of power input at maintaining a high quality of dispersion, increased productivity of the machine.