Cansolv SO₂ Scrubbing From Batch Operated Furnace For Sulphuric Acid Production.

Pranabesh Roy, Lead Expansion Project, Hindustan Zinc Ltd.
Patrick Ravary, Process Consultant on Project
John Sarlis, VP R&D, Cansolv Technologies Inc.

Presenté à l'événement Sulphur 2006
Vienne, Autriche - novembre 2006

ABSTRACT

Smelting of lead sulfide concentrate with a non-continuous process can present a challenge in converting the off gas SO₂ into sulphuric acid in a conventional acid plant.Such was the case with the installation of an Ausmelt top submerged lance technology furnace at Hindustan Zinc Ltd’s Chanderia Lead Zinc Smelter.

In order to have an SO₂ gas stream which could be converted into acid by the existing acid plant, the SO₂ in the furnace off gas was captured using the Cansolv^® SO₂ Scrubbing System to produce a constant, highly concentrated SO₂ stream.The Cansolv^® SO₂ Scrubbing System also had the advantage of eliminating the inert gases, which eliminated the volume capacity constraints for treating the furnace gas in the existing acid plant.

The SO₂ concentration in the furnace gas varied from 0.1 to 15%vol, depending on the cycle of operation, while the stack gas consistently contained less than 100 ppmv once treated with the Cansolv^® system.Solvent inventory was used to reduce the variation in flow of the regenerated SO₂ from the Cansolv^® SO₂ Scrubbing System to the acid plant.This highly concentrated stream, which contained approximately 97% SO₂ and 3% water, improved the operation of the acid plant by enhancing the SO₂ concentration in the weak acid stream the plant was receiving from the sinter unit, thereby eliminating the need for additional heat from fuel.The application of a regenerable scrubbing system to capture SO₂ from a batch-operated furnace in order to produce acid in a conventional acid plant, was a first of its kind in the world. This plant is in operation since December 2005.

Note: This is a follow up to a paper presented at the Sulphur 2004 conference in Barcelona, Spain while the plant was in its design phase.

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