The wide application of baghouse in nonferrous metal refining

The reason why the baghouse is widely used in the nonferrous metal refining process is because in the process of nonferrous metal refining, metal or their compounds to improve or gasify into steam, in the flue gas is oxidized in the condensed child, such of the dust is very subtle, only with a baghouse and electrostatic baghouse to clear to clear. But the baghouse should not be used for high temperature gas.

There are three main features of the dust collector in the extensive application of non-ferrous metal exercise:

First, that is, non-ferrous metal exercise in the high temperature of the flue gas in the flue gas temperature is usually 300-900 ℃, the highest can reach more than 1300 ℃, and into the electrostatic baghouse temperature should not exceed 450 ℃. Thus, when the flue gas temperature is above this value, the flue gas needs to be cooled by a cooling device such as a waste heat boiler, a vaporization cooler and an air preheater before the flue gas enters the electrostatic baghouse. But it should be noted that if the flue gas is rich in sulfur dioxide, its content is usually 0.5% to 1.0%), it is also necessary to control the minimum flue gas temperature entering the electrostatic baghouse so that it is not below the dew point of the sulfuric acid flue gas (usually 200 to 275 ° C) to prevent flue gas condensation. The operating temperature of the electrostatic baghouse can usually be controlled between 250 and 350 ° C.

Followed by the filter bag dust fine and rich in metal vapor oxidation in the flue gas generated by the metal oxides, such as lead oxide, zinc oxide.

The final is the filter bag furnace to strengthen the exercise of the dust concentration greatly improved, such as jubilite roasting furnace flue gas concentration of 200 to 300g / m, flash smelting to 100g / m, usually flue gas For 15-80g / m, at this time to set up before the electrostatic baghouse level or two mechanical dust removal equipment.

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