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)

1 year ago
m_aazami 1 year 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


1 year ago
SmartDog 1 year 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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