When plant concentrates Outokumpu fumes from roasting zinc sulfide to produce sulfuric acid, washed with sulfuric acid to remove mercury in flue gas, therefore the method known as the Outokumpu mercury removal method. When the concentrate is calcined at around 950 °C, all of the mercury in the ore is volatilized. After the dust is removed by the dust collector, a part of the mercury is removed, and about half of the mercury enters the washing tower, and the residual mercury enters the sulfuric acid product.

The flue gas is first removed by a high temperature electric precipitator and then washed with 85% to 93% concentrated sulfuric acid in a washing tower equipped with a packing. The washed acid is maintained at the desired temperature by the heat exchanger. As the acid reacts with the mercury vapor, the resulting precipitate settles in the tank. The precipitate was washed with water and filtered for distillation. The condensed mercury metal, solid impurities removed by filtration, purity of 99.99%. The recovery of mercury in the precipitate is 96% to 99%.

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