CS256319B1 - Method of flotation pulp,air and flotation agent mixing - Google Patents

Abstract

The method improves the efficacy of blending, increases the amount of dispersed feed air into the flotator, therefore the supply may be reduced or completely eliminated aeration air from an external source. Yippee it is possible to regulate the amount of air intake , the vacuum, the degree of dispersion of the flotation agent reagents in air, and thus in flotation rmutu. Perfectly blending the flotation system mash, flotation agent, air decreases consumption of flotation agents and improves technological results of flotation.

Description

The invention relates to a method of mixing flotation mash, air and flotation agent to form a homogeneous dispersion mixture of liquids and gases.

The hitherto known method of mixing flotation mash, air and flotation agent is based on the principle of mechanical mixing in a mixing tank. Flotation mash and flotation agent are fed into the mixing tank provided with the stirrer. The effect of rotation of the mixer also sucks air into the tank and mixes the individual components in the tank. Compressed air from an external source is sometimes supplied to the mixing tank. Mixing of two components, liquid and gas, is sometimes carried out directly in the pipeline during biological waste water treatment. According to Swiss Patent No. 627,664, a liquid supply nozzle is built into the gas flow conduit, the jet of liquid being directed to the baffle element, thereby generating droplets which are mixed with air. Or according to U.S. Pat.

589 190, the sludge is saturated with air prior to biological treatment by incorporating an injector of a certain shape and size into the sludge inlet duct to the tank to suck in some air. A disadvantage of mechanical mixing methods is the low mixing efficiency. The air aspirated by the mixer or supplied from an external source is not finely dispersed and therefore cannot be perfectly

- 2 256 319 mixed with flotation buffet and flotation reagent · Part of this air protrudes to the surface of the mixing tank and passes back to the atmosphere · Another disadvantage is the high weight and wear of the mixing tanks. The disadvantage of the ejectory mixing method in the pipeline is the mixing of only two components and, in addition, in all the described methods it is not possible to control the degree of dispersion of the flotation agent and the aeration value of the buff.

The aforementioned drawbacks in the mixing of the flotation rush, air and flotation agent are de-aerated according to the method of the invention, which consists in creating a vacuum in the rushing feed line into the flotator by narrowing the pipeline and introducing air and flotation agent into the vacuum space. The flow cross-section of the conduit is tapered and one or more openings are made into the conduit beyond the conduit. As a result of the flow of the banquet, a negative pressure is created behind the narrowed area. Air is sucked in through the openings in the pipeline. The flotation agent is also fed into one or more holes and a dispersion mixture of the flotation agent and air-mist is formed. The size of one or more of these openings can be controlled. As a result of the vacuum, the laminar flow becomes turbulent when the flotation rinse flows from the constricted point in the pipeline and the mist formed is mixed with the flotation rinse. A dispersion mixture of flotation buffet, air and flotation agent - foam is formed.

The method of mixing the flotation buffers, the air and the flotation agent improves the mixing efficiency, increases the supply of perfectly dispersed air to the flotator, therefore the supply of aeration air from an external source can be reduced or eliminated. It is possible to regulate the amount of sucked air, the vacuum, the degree of dispersion of the flotation agent in the air and thus also in the flotation reception. Perfectly blending the system flotation reception, flotation reagent, air reduces consumption of flotation reagents and improves flotation technological results.

The attached drawing schematically illustrates a method of mixing a flotation buff, air and a flotation agent according to the invention, wherein in Fig. 1 there is one possible alternative embodiment and in Fig. 2 there is another alternative. FIG. 1 is a schematic illustration

258,319 a process for blending flotation mash, air and flotation agent according to the invention. The flotation mash pipe 1 to the flotation battery is narrowed by the insertion of an annular septum

2. Behind the partition are openings J for air intake or flotation agent supply into the pipeline χ. The size of at least one of the holes ³ and 2 may be controlled apparatus 4 · Fig. 2 shows another embodiment of the disclosed method for mixing flotation softening, air and flotation agent according to the invention. The flotation mash pipe 1 to the flotation battery is narrowed by insertion of a frustoconical partition 2. At the constricted point of line X, openings 6 are made into the line and one of them is connected to line 2 for supplying the dispersion mixture of air and flotation agent to the flotation mash. The conduit 6 is narrowed by the insertion of a frustoconical septum 6 and an opening 2 is provided for the flotation agent inlet. The size of the aperture je can be controlled by the device 4.

Claims (2)

A method of mixing flotation mash, air and flotation agent, characterized in that a vacuum is created in the mash feed line to the flotator by narrowing the duct and supplying air to the vacuum space to which the flotation agent is added. 2. A method of mixing flotation mash, air and flotation agent according to claim 1, wherein the amount of vacuum is controlled. 1 drawing