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How to correlate pilot scale data of Pressure filter with that for designing of plant. What will be ... (4 replies and 4 comments)
The filtration process comprises deferent stages since the slurry is added to the filtration chamber. The typical stages are pressure, drying and washing. There is a parameter sometimes overlook, this is the technical time, which comprises the time required to perform some mechanical and manual operations during the filtration process. The testing program provides information on the filtration rate and cake moisture. The filtration rate is used to select the filter model and the number of filters. If you want to filter tailings, the design should consider a special safety factor, otherwise the number of filters would not be enough the manage the daily flowrate of tailings. Also, in this case, it is important to consider a standby filter.
Thanks for reply. But I want to know what is the special safety factor we should consider while designing the filter press for Tailings. At present I have to select and size Filter press for iron ore tailings having Fe= 35%, Silica- 40%, Alumina- 8%. It is hematitic ore. How the correlation between between pilot scale data to industrial scale will be made.
When looking at pilot plant data (and even lab test data) it should be noted that these are generally under "ideal" conditions. Actual plant operation is far from "ideal", as tailings will vary over time in composition, and water quality will change, both effecting filter performance. As such amany of the "special factors" are judgement calls based on experience (and yes much of the experenice is from poor judgement calls). That said, the pilot results should be looked at as a minimum requirement and size and capacity adjusted upwards from there to allow for mechanical breakdowns, operational upsets and such. These will also include factors such as production rates being higher than planned (always happens), and more fine tailings then planned (always happens).
Because of all this no general factors can be provided (as each operation is different). But allowing for 25-30% (or even 50%) more capacity on tailings designs will generally mean your system is not to far under sized.
Thanks sir. Means one has to increase the filter area by 25- 30% in case of tailings. I also want to know How filtration rate is calculated whether it is on hourly basis or cycle time basis.
As to "How filtration rate is calculated whether it is on hourly basis or cycle time basis."
The answer is yes, both, then use larger.
Comment on this...
Thanks a lot. As we know filtration test should be done on sample which should be fresh coming from thickener underflow. It should not be dried, and again repulped. This will change the property of material and finally filtration behaviour.
I want to what are the changes occurred in material characteristics of iron ore tailings and how will it effect the filtration rate and filtration cycle.
To understand changes in tailings and effect on filtration you need to look at any changes in raw ore, plant upsets, water chemistry changes, weather, and climate changes (such as summer vs winter). Each and all of these will effect tailings and the filtration characteristics. Dry, warm, high pressure weather vs wet, cold, low pressure system will change filtration rate and characteristics of filter cake. Part of the reason for allowing for extra capacity. As well as maintenace conditions, age of cloth, and performance of vaccuum pumps.
Thanks a lot sir. What is the effect of - 40 micron particle in pressure filtration. What is the effect of Silica/ Alumina ratio in filtration. Is high silica to Alumina ratio is beneficial for filtration. Because siliceous particle are added as aiding agent in pressure filtration
How to correlate pilot scale data of Pressure filter with that for designing of plant. What will be the effect on Cycle Time consideration. How to calculate size of filter.