Hydraulic flotation process

The proposal was fatally flawed by failing to address some of the most critical elements of soil washing. Soil washing is essentially a hydraulic flotation process which removes the fines from the soil. Depending upon the soil, that can account for between 5% and 15% of the volume processed. The process is strictly one of density settling and stokes law is followed in the separation process. What you wind up with is a clean and sterile soil because the organic materials in the soil have a density of between 1.2 and about 2.0 and the clays, and some of the silts, because of their particle size are removed from the soil. In the case of Belarus soils, this also removed about 60%-80% of the fine radioactive materials, but that was not the problem. The problem was one of scale and residuals. 

The use of ozone has been proposed in special ore-flotation processes. Two widely different applications involve hydraulic cement and the fabrication of coating on insulators. 

The better the hydraulic performance of the tank (expressed as dispersion number) and the better the floe formation (expressed as collision efficiency factor), the smaller are the differences in efficiency between the sedimentation and flotation processes. 

Inexpensive coal or petroleum coke fuel will contain sulfur. The hydraulic cleaning processes involving pulverization to 0.1 mm particle size and flotation separation of pyrite (FeSj) particles from the coal, will remove roughly half of the initial sulfur. Sulfur chemically bound to the coal molecule will be entrained with the char to some extent. 

Hydraulic induced units are less complex than the mechanical induced units. In contrast to the mechanical units, the hydraulic units are capable of operating the flotation process above atmospheric... 

Figure 27.12 shows the improved activated sludge process in which a new secondary flotation is applied in series between the aeration basin and the final sedimentation clarifier for increasing the overall treatment performance and hydraulic capacity of an originally overloaded existing plant. 

The tailings from the various flotation stages of an industrial separation process can be combined and hydraulically transported by pipeline ([90,606], see also Section 10.2). Sometimes the tailings pipelines are dose to the separation plants, and therefore are of modest length, but it is not uncommon for such pipelines to extend for several tens of kilometres to a settling basin. 

Ovhemical DOSING for improvement of liquid-solid separation is traditionally designed and operated more or less independently of the geometry and hydraulic performance of the actual separation reactor. The widespread use of jar tests in the day-to-day operation of filtration and flotation plants illustrates this fact. Yet it is not difficult to visualize situations in which aggregation processes would furnish floes unsuitable for the subsequent separation unit, such as voluminous floes that do not settle out readily. 

Uses Lubricant, emollient for creams and lotions antifoam for nonaq. petrol, processing systems, hydraulic fluids, pigment flotation on paints heat transfer fluid for drug mfg. release agent also for cosmetics, car polish aerosol pkg. lubricant in antiperspirants/deodorants defoamer for food processing in resinous/polymeric food-contact coatings in food-contact paper/paperboard in resin-bonded filters for food contact in food-contact textiles... 

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