Conveyor For Bentonite
How long is your conveyor and what are the tonnages that are being fed: a) Bentonite =1.7t/h; b) Hematite = 70 t/h; c) Magnetite = 280 t/h?
How far apart are the feed points?
The maximum grain size: Bentonite = 100 micron is not as important as the quantity for the finer size < 10 micron. Ditto for others. Thus, you need to offer the size distribution in order to evaluate dust and dust control. ■
More Detail
Dear Mr Nordell
Thank you for your reply. Here is the information.
This is an schematic of the reversible conveyor attached. Bentonite and hematite are fed from left and magnetite from right. The conveyor may go either ways depending on situation. Exact tonnages of material are as follows:
Bentonite=1.7 tph
Hematite=75 tph
Magnetite=280 tph.
Exact material size distribution is not available. However, following properties might be assumed:
Magnetite Concentrate: Blaine number=2200-2400 cm2/gr, moisture 0.5%.
Hematite concentrate: Blaine number=1000-1100 cm2/gr, K80<75 microns, moisture 7%.
Bentonite: K90<75 microns K70<44 microns, moisture 1%.
As I had mentioned this is mixing department of a pelletizing plant.
I appreciate your kind help. ■
Length & Loading - Bi-Way
Dear Alireza,
Based on your schematic, I see no problem with designing for moving material in either direction, except the geometry at the Bentonite-Hematite feed point slanting opposite one flow direction. A 7% moisture content, with fine material, may pose some flow behavior that needs to be considered, it should be tested for cohesive action. You could do a simple test, with a sample, to see if the cohesion is too strong to flow at the intended angle.
The skirt system will need to cover the material in both directions.
Since we are offering general points, and not engineering details, what other general points are you concerned with?
Originally Posted by Alireza
Thank you for your reply. Here is the information.
Bulk online schem-Model.pdf
This is an schematic of the reversible conveyor attached. Bentonite and hematite are fed from left and magnetite from right. The conveyor may go either ways depending on situation. Exact tonnages of material are as follows:
Bentonite=1.7 tph
Hematite=75 tph
Magnetite=280 tph.
Exact material size distribution is not available. However, following properties might be assumed:
Magnetite Concentrate: Blaine number=2200-2400 cm2/gr, moisture 0.5%.
Hematite concentrate: Blaine number=1000-1100 cm2/gr, K80<75 microns, moisture 7%.
Bentonite: K90<75 microns K70<44 microns, moisture 1%.
As I had mentioned this is mixing department of a pelletizing plant.
I appreciate your kind help.
■
Re: Bentonite With Belt Conveyor
Dear Mr Nordell
I appreciate your reply. We will consider the mentioned probable problem. I think that the chute geometry alteration will help.
Thank you for your kind help.
Best wishes,
Alireza ■
Bentonite with Belt Conveyor
Dear Sir
We are modifying a mixing department in a pelletizing plant. Due to design concerns, we like to convey bentonite with belt conveyor instead of screw conveyor. I wonder if anyone has previous experience on the matter. Any comment is appreciated. Our main concerns is dust problems. However, we want to know if any other cautions must be considered.
Here is the process summary:
Hematite concentrate and bentonite are discharged to a chute together and then on a belt conveyor. Then, at another point magnetite concentrate is added to the belt conveyor load. The conveyor discharges the total load into a mixer. Please note that the Hematite moisture might help dust problem.
If any other question aroused, please let me know.
Thank you for your kind help.
Alireza
P.S. Material general properties are as follows:
Material: Bentonite Hematite Magnetite
Density (t/m3): 0.5-0.8 1.8-2.3 1.8-2.3
Moisture (%): 0.5 7 0.5
Conveying rate (tph): 1.7 70 280
Maximum grain size (mm): 0.1 0.2 0.2 ■