Without further irrelevant data like lump size & shape the only options open are a miracle or sense of direction. Should it go up or down? ■

60 m horizontal distance at 45 Deg means an elevetion of 60 m. You are probably looking at conveying prereduced iron oxide and unburnt coal to a bin for further processing. This can be done by using a chain elevetor mounted SS buckets. The whole installation can be installed in a casing (2 to 2.5 m pipe with insulation) with suitable transition pieces with feed and delivery ends. The pipe can be at a suitable pressure and can be used for heat recovery.

Vinayak Sathe tel: (0832 2538294) ■

Unburnt coal @ 700 C to a bin? This is a big plant with a serious layout deficiency. Of course you need buckets; they must be exotic; stainless alone is not good enough. Would you cool the roller bearings for the tub carriages by cold gas etc etc. Do you intend to cool the job down during the 2-4 hours idle period? If you let it get cold the spillage will be a bit hard to dig out. A gas tight expansion joint for a 2.5m pipe will not be found growing on a tree. You really need serious help on this one. Nobody that I know will design a reactor feed line for free. ■

1. Material to be transported - Reduced Iron (highly inflammable, i.e prone to re-oxidation: Can you give details of feeding point. Is is a discharge froma verticle saft reactor / rotory cooler - screening station outlet. A sketch will help.

2. Temperature of material to be conveyed- 700 deg. - 725 deg. (Heat loss should not be more than 40 - 50 deg. C). : Do you want to feed the hot product into a bin feeding meting furnace? what is size of this bin. again a sketch showing headrooms and space available will help. Capital expenditure for hot-inert atmosphere conveying has be weighed against reducing power consumption during melting. Heat can be recovered before conveying the material.

3.Atmosphere around material during conveying to be maintained - Inert (specially with N2) for no oxidation by O2 or Moisture in environment: This can be done.

4. Elevation - from 8 meter to 65 Meter hight at 200 & 400 TPH:

The lift is 57 m. What is the horizontaldistance for conveying?

Please send details tome by email at vinayak.sathe@gmail.com or call me at (0832) 2538294.

Vinayak Sathe ■

Dear Srivastava,

I understand Hot DRI is conveyed pneumatically in an inert atmosphere in Mexico. You may contact HYL for details.

Regards

KV Subba Rao ■

Back in Essen during 1990 I was instructed to look into the Mexican pneumatic conveying idea & then told to forget it because it wasn't feasible, which had also crossed my mind from day 1. But if they have got it working in the interim then that would be the way to go. Their inert gas was thought to be CO2 which wold make a lot more sense than N because you are not very far off a nitriding oven with what you propose.

You would better pay someone like Kaiser or Stein Atkinson Stordy to sort it out rather than disseminate advices made on this forum. ■