The invention discloses a method for heightening two-stage
roasting arsenic collecting efficiency and special equipment. The method comprises the following steps: furnace gas, which is generated by one-stage
roasting, is dedusted by means of reducing temperature through a two-stage
whirlwind furnace cooler, and is again dedusted by means of removing
electricity with furnace gas which is generated by two-stage
roasting and be dedusted by means of reducing temperature through a one-stage
whirlwind furnace cooler; the temperature of the dedusted furnace gas is reduced through a quench
tower, and the
arsenic of the dedusted furnace is recycled through a cloth bag
arsenic collector; the remaining furnace gas is used for producing aid; and the dust and roasting
slag, which are collected by the furnace cooler by means of the one-stage roasting, are put into the two-stage roasting. The equipment comprises a one-stage roasting furnace (1) and a two-stage roasting furnace (5). The equipment is characterized in that the one-stage roasting furnace (1) is connected with the two
whirlwind devices and the furnace cooler by means of sealing in sequence; the bottom end of the one-stage roasting furnace (1) is communicated with the two-stage roasting furnace (5); the two-stage roasting furnace (5) is connected with one of the whirlwind devices and the furnace cooler by means of sealing in sequence; the bottom of the two-stage roasting furnace (5) is connected with a water
quenching system; and the furnace cooler is communicated with an electric deduster (8), a cold collecting
tower (9) and a cloth bag arsenic collecting device (10) in sequence. The invention has high arsenic collecting efficiency, does not frequently stop vehicles to clean the cloth bag, and increases productivity effect.