摘要:
Conditioning and concentration of microalgae are accomplished by the process steps of grinding a dilute aqueous dispersion of microalgae in the presence of grinding media and then applying adsorptive bubble separation. This process is amenable to the use of dilute feed microalgal dispersions such as are encountered in the production of algal biomass for biofuel applications.
摘要:
A rotor for flotation machines or flotation cells of flotation machines includes blades that are configured to provide improved bubble flow and bubble generation performance while also reducing the power requirements for rotating the rotor to generate bubble flow within a tank of a flotation cell used to generate froth. Embodiments of the rotor may also be configured to be smaller than conventional rotor designs, which may help reduce the costs of manufacturing the rotor or flotation machines using such embodiments of the rotor.
摘要:
The invention relates to a method of using a flotation machine that is used in metallurgical processes and to a flotation machine. The flotation machine foams hydrophobic particles from anaqueous slurry that contains these particles. The flotation machine includes a flotation cell (1), and a rotor (2) that is inside the flotation cell. The rotor (2) is rotated at a mixing power, which maintains the suspension in the slurry and mixing of air with the slurry to form the foam, and the mixing power is controlled by adjusting the rotation speed of the rotor. The amount of solid matter S accumulated on the bottom of the cell (1) is determined, and the rotation speed of the rotor (2) is adjusted on the basis of the determined amount of solid matter. The flotation machine includes a measuring device (5) for determining the amount of solid matter accumulated on the bottom of the cell. The adjusting device (4) is arranged to adjust the rotation speed of the motor (3), which rotates the rotor (2), on the basis of the measuring result of the measuring device (5) to remove the solid matter from the bottom of the cell.
摘要:
A water treatment unit comprising a bath (2) delimited by a bottom wall (3) and a lateral wall (4) developing in elevation from a whole perimeter of the bottom wall (3), means for supplying (14) the water to be treated into the bath (2), at least an aeration device (5) have dissolving functions in collaboration with the means for supplying (14), for introducing a flow of oxygen or ozone into the water contained in the bath (2) in order to saturate the water and/or to give rise to foam, means for eliminating (6) the foam, at least an outlet section (13) of the treated water from the bath (2). The bath (2) develops prevalently horizontally and internally comprises a dividing wall (7) which divides the internal volume of the bath (2) into a turbulent water zone (2a) and a calm water zone (2b).
摘要:
A control method of a flotation machine that is used in metallurgical processes. The flotation machine includes a flotation cell (1), and a rotor (2) that is inside the flotation cell. The amount of solid matter accumulated on the bottom of the cell is determined, and the rotation speed of the rotor is adjusted on the basis of the determined amount of solid matter. The rotor is rotated at the lowest possible first rotation speed which, in terms of metallurgy, is selected so as to have an adequate mixing power to maintain a suspension and form foam and, at the same time, to be small enough to allow the accumulation of solid matter on the bottom of the cell. The rotation speed of the rotor is periodically increased from the first rotation speed to a higher second rotation speed to remove the solid matter accumulated on the bottom of the cell. The second rotation speed is maintained for a predetermined period of time, after which the rotation speed of the rotor is reduced to the said first rotation speed.
摘要:
A water treatment unit comprising a bath (2) delimited by a bottom wall (3) and a lateral wall (4) developing in elevation from a whole perimeter of the bottom wall (3), means for supplying (14) the water to be treated into the bath (2), at least an aeration device (5) have dissolving functions in collaboration with the means for supplying (14), for introducing a flow of oxygen or ozone into the water contained in the bath (2) in order to saturate the water and/or to give rise to foam, means for eliminating (6) the foam, at least an outlet section (13) of the treated water from the bath (2). The bath (2) develops prevalently horizontally and internally comprises a dividing wall (7) which divides the internal volume of the bath (2) into a turbulent water zone (2a) and a calm water zone (2b).
摘要:
The invention provides a flotation device including a series of flotation tanks (1) for processing a slurry incorporating valuable minerals for extraction. At least one of the tanks includes a side outlet (15) adapted for the withdrawal of targeted relatively fine coarse particles from the slurry. The tanks also include a bottom outlet (14) for the withdrawal of relatively dense or coarse components of the slurry. The incorporation of bottom and side outlets allows the slurry to be separated into two parallel streams, one configured for optimal recovery of the relatively coarse or dense slurry components and the other for optimal recovery of the relatively fine slurry components. In this way, outflow slurry from downstream tanks in the coarse particle stream has a higher proportion of coarser particles than was present in the inflow slurry from the upstream tanks. Consequently, when a flotation reagent is added to the slurry in the downstream tanks, there is a greater probability of coating some of the larger particles. Therefore, the probability of floating these larger particles increases in the downstream tanks. This in turn increases the overall efficiency of the flotation process.
摘要:
The invention provides a flotation device including a series of flotation tanks (1) for processing a slurry incorporating valuable minerals for extraction. At least one of the tanks includes a side outlet (15) adapted for the withdrawal of targeted relatively fine coarse particles from the slurry. The tanks also include a bottom outlet (14) for the withdrawal of relatively dense or coarse components of the slurry. The incorporation of bottom and side outlets allows the slurry to be separated into two parallel streams, one configured for optimal recovery of the relatively coarse or dense slurry components and the other for optimal recovery of the relatively fine slurry components. In this way, outflow slurry from downstream tanks in the coarse particle stream has a higher proportion of coarser particles than was present in the inflow slurry from the upstream tanks. Consequently, when a flotation reagent is added to the slurry in the downstream tanks, there is a greater probability of coating some of the larger particles. Therefore, the probability of floating these larger particles increases in the downstream tanks. This in turn increases the overall efficiency of the flotation process.
摘要:
The invention relates to a device for a flotation machine in which a drive shaft for mixing slurry and transporting air is driven by a drive arrangement and the drive shaft is provided with a bearing assembly and the drive shaft is at least partly hollow in the interior for transferring air to a rotor. According to the invention the drive shaft (7) is provided with at least one bearing (11) in a housing separated from at least one element (12) forming an air transfer chamber (13) around the drive shaft (7). Further, the drive shaft (7) has at least one opening (16) in order to create an essentially continuous connection between the air transfer chamber (16) and the interior (17) of the drive shaft (7).