Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill–Crowe, SX Solvent Extraction

Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill–Crowe, SX Solvent Extraction2017-04-04T06:57:36-04:00
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Burning of Sulfur in Alis Chalmerz Technology (Iron ore pelletizing plant) (1 reply)

10 months ago
m_aazami 10 months ago


recently we started the design of a iron ore pelletizing plant using rotary kiln method (alis chalmerz technology).

the S content  of iron concentrate is about 0.2% and we want to reach to less than 0.008% in the pellet product.

but the EPC contractor stated that it is not possible to burn this amount of Sulfur in the the rotary kiln method.

my question is:

1- how many percent of sulfur can be burnt in the rotary kiln?

2- why it is possible to burn S in the Lurgy technology but is not possible in the alis chalmerz method (Becouse in another project, using Lurgy Technology, the EPC Contractor accepted to burn about 1% of sulfur in the plant)?

Thank you for your help.

Dr. M. Aazami

Process Engineer


10 months ago
SmartDog 10 months ago

Without seeing the process flow diagram the first thought would be the basic temperature differences in the process.  The Allis Chalmers process using a rotary kiln is used to sinter the pellets, particularly the outside of the pellets, to allow them to withstand transport.  The pellets are not heated to the combustion point of S through out the pellet, but primarily a surface treatment.  This is down by lifting and dropping the pellets in a a rotating cylinder.  The Lurgi process uses a traveling grate method that can heat the pellets to a higher temperature.  Without the dropping.  It can get to a higher temperature probably assuring complete heating of the pellets.


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