Dewatering Filter Aids
Ores of various minerals are concentrated by various procedures to provide mineral concentrates that are further processed to valuable materials. One of the most widely used methods of concentration of minerals is that of froth flotation which is applicable to a wide variety of ores including sulfide and non-sulfide varieties.
FILTER CAKE DEWATERING AID FOR THE MINERAL PROCESSING INDUSTRY
Ores of various minerals are concentrated by various procedures to provide mineral concentrates that are further processed to valuable materials.
One of the most widely used methods of concentration of minerals is that of froth flotation which is applicable to a wide variety of ores including sulfide and non-sulfide varieties.
In many instances a series of flotations are performed whereby increasingly cleaner concentrates result.
After a concentrate has been sufficiently enriched in mineral values, it may be subjected to further processing such as drying and smelting, which processing may be performed at another location.
To subject the concentrate to further processing, it is generally dewatered by filtration or equivalent process, such as centrifugation to remove water therefrom. The removal of water from the concentrate decreases the costs of shipping when it is processed at a new location. The removal of water also reduces the requirements for energy consumption when drying is effected.
The commercial procedure for dewatering mineral concentrates generally involved filtration of the aqueous slurry of mineral values arising from concentrating the ore by flotation or other concentration process.
The residual water content of the dewatered mineral concentrate will vary widely depending upon the mineral composition, the procedure of dewatering employed, the absence or presence of dewatering aid, and the like.
Certain dewatering aids have been used in the prior processes for dewatering. In some instances, the dewatering aid was not completely acceptable because it did not reduce the moisture content of the dewatered mineral concentrate adequately. In other instances, the dewatering aid was not substantially adsorbed on the dewatered mineral concentrate and contaminated the process water, which water is recycled to the mining processes including that of ore concentration from where the mineral concentrates to be dewatered arise.
Contamination of the recycled process water adversely affects ore concentration and other processes associated with mining operations.
Thus, there exists the need for improved dewatering processes for mineral concentrates which not only provide low moisture contents in the dewatered mineral concentrates but which also provide dewatering aids that are substantially adsorbed on the dewatered mineral concentrates so as to minimize adverse effects on other mining processes that employ the recycled process water. Such a provision would satisfy a long-felt need and constitute a notable advance in the art.
Florrea’s DWATER@ Series dewatering Aids
Florrea DWATER @ dewatering aids /Mine dewatering filter aids are specially formulated surface active agents and, are used to reduce cake moisture in the filtration of mineral slurries, of mineral concentrates such as sulfide flotation concentrates, iron ore concentrates and coal concentrates during filtration and subsequent storage applications like tailings. These products normally reduce the surface tension of water so that water is easily removed from mineral surfaces during filtration and storage. Dewatering / filter aids are widely used in all wet mineral processing applications where improving moisture content of filtered cakes is desired.
Application areas include both sulfide and non-sulfide minerals processing and as well as coal cleaning.
Dewatering / filter aid dosage requirements vary widely based on the application. Dewatering / filter aids can be applied neat or in diluted form and points of application in the process must be carefully selected. It can be added to spray water applications onto filter cakes during filtration so that filter wash efficiency is improved, or added directly into the mineral or concentrate slurries going to filtering processes and even to centrifuging.
Florrea offers various mine dewatering / filter aids for different dewatering applications. These dewatering aids increase filtration throughput in mineral processing by reducing moisture content and improving release of the filter cake. They offer unique chemistry that can significantly increase production rates and lower energy and transportation costs.
These products also improve water recovery and water efficiency in wet mineral processing applications.
Florrea DWARWE@ FILTER AID has found application in lowering the filter cake moisture contents of a wide variety of mineral slurries including the following:
lRotary vacuum filtration of base metal sulfide concentrates, iron ore concentrates and coal concentrates and tailings
lAlumina hydrate filtration
lGlass sand filtration and drainage • Sodium carbonate or bicarbonate filtration
lRotary vacuum filtration of coal froth fines Dosage depends on application but normally lies in the range 50–250 g/tone of dry substrate.
Florrea DWARWE@ FILTER AID may be added either directly to the filter feed (mineral slurry) or where fitted, it may be added to wash water applied to the filter cake via spray bars.
As the action of FILTER AID is related to its concentration in the residual water within the filter cake, it is often beneficial to apply the product via water sprays.
As FILTER AID is a low viscosity liquid, it is normal to add the product directly to the filter feed or wash water feed although this should be done at a point of turbulence to ensure good and rapid distribution of the product.
lReduced moisture content of mineral concentrates which further improves drying processes and transportation
lImproved filtration of mineral concentrates and better filtration efficiency
lImproved drying of mineral concentrate during storage
lImproved water recovery and water efficiency in wet mineral processing applications
Anionic, Cationic and Non-Ionic Surfactants
SERVICESFlorrea’s expert field personnel are available to our customers’ engineers, production managers and operations personnel as process advisors for dewatering applications. We will examine your mineral dewatering needs and filtration system from beginning to end, and develop the best chemistry and application system to improve your operational efficiency
Florrea DWARWE@ FILTER AIDS
Florrea DWATER@7074 series dewatering aids are powerful liquid surfactants that are principally used to aid in the filtration of mineral concentrates in order to reduce filter cake moisture and improve filter cake handling characteristics.
They function by lowering the surface tension of water and more importantly, by making the mineral particle surfaces more hydrophobic (water hating), thus allowing for higher levels of moisture reduction.
Also, by varying the operating parameters of the filter, such as speed, boot level and cake thickness, the addition of the Florrea DWATER@7074 series dewatering aids can lower moisture, increase filtration rates, improve filter cake release and improve filter cloth life.
Florrea DWATER@7074 series are highly concentrated, clear, slightly viscous liquids that are readily dispersible in water.
Florrea DWATER@7074 is specially formulated to raise the flash point above 200° F for improved safety and long term
These products have a low tolerance for pH above 9.
As pH increases above this point, the product decomposes at faster rates.
This property can be used to eliminate any potential problems in a closed circuit system through the adjustment of the slurry pH with lime to assist in the decomposition of the product.
Contact your Florrea representative for information on decomposition vs pH and time.
Other Florrea DWATER@7074 series dewatering aids are available that are more readily dispersed in pulps when conditioning times are limited
Florrea partners with mineral processing companies to engineer tailings dewatering solutions that recover as much water as possible, giving you a more sustainable tailings disposal process while extending the life of your tailings storage facility and try to increase as much as possible the amount of a traditional tailings disposal solution – which ultimately helps to defer the heavy cost of building a new facility.
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