Very dependent on the chute configuration. You can do 6 degree incline provided the product velocity is near the receiving belt speed at the point where the material leaves the chute and lands onto the belt. ■

As mentioned, chute configuration will influence your result.

Surcharge angle will also vary with chute configuration, material and feed angle. I would be conservative in my capacity estimates with respect to surcharge angle in your situation. ■

Hello Sathish..

I was once asked to see if I could stop spillage of bone dry Imenite sand being fed onto a conveyor with a loading angle of 11 degrees.

It has no surcharge and was flowing backwards like water, due to bad feeding angle.

I modified the chute to feed in the direction of the belt, and stopped the spillage.

So it can be done up to 11 degrees.

We normally load at 5 degrees however, and 8 degrees if pushed.

We try and avoid steeper loading points.

6 degrees OK for you

Cheers

LSL Tekpro ■

Right Graham,

As long as the feed transfer does not aerate the material. Once aerated, the entrained gas acts as a lubricant and can cause a stalling action that will cause overfilling and spillage.

What is the size range of your Imenite sand? Is it over 200 microns? ■

Hi

I would def. not load at an angle for fly ash - it will flood back upon a crash stop etc. I did a post yearss back on our 2.2km long conveyor that loads fly ash, cement and clinker and limestone and gypsum to a radial shiploader...

After 2.2km (25mins) , the fly ash had settled to about 1/3 the burden depth and was like cow pats on the belt as it went over idlers etc...and even remained so after the first transfer.

Cheers...James ■

Larry..

Bone dry Ilmenite is like very fine sand. If you grab a handfull, it pours through the gaps in your fingers. Goes up 11 degrees though.

(Water goes up 16 degrees at 3.5m/sec)

We have done numerous fly ash conveyors for our Power Stations.

In all cases we "condition" it with water, as it causes dusty transfers and blows off the conveyors in the wind.

We also mix it with Coarse clinker wet boiler bottom ash from the submerged scraper conveyors under the boilers.

Trouble is this wet stuff is extremely sticky and at around 17 to 19% water, can clog chutes, unless they have negative (flare out) transfer chutes.

Cheers

LSL Tekpro ■