In the mixed smelting of bismuth , no large amount of dusty fumes will be produced in the reverberatory furnace or converter. In the igniting and arsenic refining process, a large amount of arsenic trioxide and trioxide will be produced in the process of arsenic removal and antimony oxidation. fumes of antimony, bismuth metallurgical dust collection, mainly two kinds of smoke on governance.
Tables 1 and 2 list the composition of the flue gas and soot produced by the reverberatory refining of the crucible and the refining of the refining pot; Table 3 lists the amount of flue gas, the dust content and the flue gas flow rate.
Table 1 Composition of reverberatory furnace and refining boiler flue gas (%)
Table 2 Resin furnace and refining pot soot composition (%)
Table 3 Flue gas parameters of reverberatory furnace and refining pot
The refining reverberatory furnace and the refining pot are periodically interrupted, so the amount of flue gas and dust content as well as the composition of the soot and the composition of the flue gas fluctuate greatly, which brings certain difficulties to dust collection.
According to the periodic production and flue gas characteristics, the metallurgical filter should adopt a filter bag dust collector. The separation of gas and dust by passing dusty flue gas through the fiber fabric is a feature of various bag filters.
The dust collecting mechanism of the bag filter is summarized in three main points:
(1) Screening action, when the dusty flue gas passes through the porous fiber filter medium, the dust particles are adsorbed on the medium by the blocking surface to form an additional filter layer, and the filter medium and the additional filter layer jointly bear the dust particles in the flue gas. effect. When the additional filter layer reaches a certain thickness and the flue gas passes through the difficulty, the negative pressure is increased, and the soot is swayed by the compressed air to cause the soot to settle into the dust collecting hopper by gravity.
(2) Collision, the dust particles are deposited by collision with the filter medium and the additional filter layer under the action of inertia or thermal action of gas molecules.
(3) Electrostatic action, depending on the electrostatic attraction between the dust particles and the charge of the fiber fabric.
Figure 1 shows the dust collection process of the dust from the reverberatory furnace through the bag filter:
Figure 1 bag filter dust collection flow chart
The flue gas temperature of the 10 m 2铋 reverberatory furnace is 1050 ~ 1150 ° C, the flue gas volume is 2700 ~ 4600 b m 2 / h, the dust content is 3 ~ 10 g / standard m 3 , after the dust is collected by the bag filter, the flue gas is purified. The dust content is less than 0.03 g/ m3 , and the dust collection efficiency is over 99%.
The bag filter is generally composed of a bag filter chamber, a filter bag and a skeleton, a dust removing device, a dust collecting bucket, an air inlet exhaust pipe, and a dust exhausting device. There are many types of filters, which are generally classified according to the method of cleaning. They can be divided into manual rapping, mechanical rapping, compressed air rapping, anti-blowing cycle cleaning, pulse blowing cleaning, gas ring moving. Backflushing and other methods.
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