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We are an important link in the chain completing
substance cycles for major
and small and medium-sized
companies of the basic substance industry and
for
galvanizers of every kind. Our international team
with specialists from
Germany, Kazakhstan, Hungary,
Poland and Finland makes us one of
Europe's most
efficient producers.
Our name obliges us to maintain a tradition:
we are RuhrZink GmbH.
Schwefelsäurekontaktanlage
The final stage in which the waste gas is processed is a dual catalyst plant where sulphuric acid is produced from SO2-containing waste gas. The required SO2/O2 ratio of around 1:1 for optimum SO2 conversion is produced by mixing air into the purified cold roasting gas.
The gas mixture containing 96% of sulphuric acid is then dried in a packing tower and transported by a fan through a heat-exchanger contact system. The contact group uses a dual catalyst with vanadium pentoxide catalysts. After a preliminary conversion of around 60%, the generated SO3 is removed through intermediate absorption and the total conversion of the SO2 is increased in the final contact stage to 99.6%.
The employment of the two-stage catalytic process removes SO2 from the final gas to the extent that it satisfies air-contamination limits. The heat created through the absorption of sulphuric trioxide in regard to sulphuric acid and through the contact conversion of gas to sulphuric trioxide is discharged through plate coolers to an internal water cycle.
The process heat is then further cooled by passing it through open air-cooling towers. Important process parameters such as acid-circulation quantities, temperatures, pump-power consumption and so on are technically measured and used to control the plants. Particular attention is placed on acid clarity and low contamination.
The produced sulphuric acid is stored in two similar steel containers each possessing capacity of 8000 m³ and put at the disposal of sales for distribution on barges and tankers. The piping system and tank facilities are monitored by experts.
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