Fluidized bed roaster for treating high-copper high-lead zinc concentrates

Abstract

The invention discloses a fluidized bed roaster for treating high-copper high-lead zinc concentrates. According to the fluidized bed roaster, supporting legs are arranged at the lower part of a fluidized bed roaster body; an air bellow is arranged at the position, among the supporting legs, of the lower part of the fluidized bed roaster body; an air blower air supply pipe is connected in the air bellow; a perforated pattern plate is arranged at the upper part of the air bellow; wind caps are arranged on the perforated pattern plate; the upper parts of the wind caps are provided with wind cap upper openings; water jackets are arranged on the periphery of the fluidized bed roaster body at intervals; water jacket air pipes are connected to the water jackets in a penetrating mode and are connected to auxiliary air pipes; the positions, at the lower part of the pattern plate, of the auxiliary wind caps are connected to the auxiliary air pipes through metal flexible connecting parts; the auxiliary wind caps are connected to the upper parts of the auxiliary air pipes and are provided with side openings; and the side openings face the center part of the fluidized bed roaster body. The fluidized bed roaster has the advantages that the auxiliary air pipes are arranged in the air bellow of the fluidized bed roaster body, the water jacket air pipes are additionally arranged at the water jackets, the auxiliary wind caps are additionally arranged, so that the boiling state of materials in the fluidized bed roaster body is good, slagging is reduced, discharging is smooth, and therefore the service life of the the fluidized bed roaster body is prolonged. The fluidized bed roaster is suitable for being used as a high-copper high-lead zinc concentrate fluidized bed roaster.

Description

technical field [0001] The invention proposes a roasting furnace in the field of metallurgy, specifically a fluidized roasting furnace for processing high-copper, high-lead-zinc concentrates. Background technique [0002] The non-ferrous metal industry standard of the People's Republic of China contains 40-55% of zinc, 1.2-2.5% of lead, 1.0-1.5% of copper, 6-14% of iron and 3.5-5.5% of silicon dioxide in "zinc concentrate". At present, due to the shortage of zinc concentrate resources at home and abroad, the number of high-impurity zinc concentrates has increased, and the production costs of enterprises are limited. Processing high-impurity zinc concentrates can reduce production costs. At present, the roasting furnace for zinc smelting has strict requirements on the impurity ratio of the zinc concentrate used in the furnace. In order to ensure the fluidization state of the fluidized furnace, control Pb≤1.6%, Cu≤0.65%, Pb+Cu<2.2%. [0003] Normally, zinc concentrate is b...

AI Technical Summary

Problems solved by technology

The normal sulfation roasting temperature is 870~950℃, the lead in the raw material is easy to combine with SiO 2 Lead silicate with a low melting point is formed. The melting point of lead silicate is 743°C. Since the melting point of lead silicate is lower than the normal roasting temperature, there are the following hazards: wrapping zinc concentrate, hindering the contact between oxygen and zinc sulfide, and affecting the calcine Quality; make the zinc concentrate particles bond, produce sintering and deposit on the bottom of the fluidized fluidized furnace, which can easily block the holes of the air cap, and form material accumulation on both sides of the furnace wall and discharge port, resulting in the collapse of the furnace wall and dead furnace; Unsmooth material discharge seriously affects the fluidization state of the fluidized fluidized furnace; in the case of high furnace temperature, the furnace material is sintered, and the furnace condition is seriously deteriorated, which eventually leads to accident shutdown

[0004] When calcined at high temperature, copper is mainly in free state Cu 2 O exists, partly Cu in bonded state 2 O.Fe 2 o 3 And the existence of copper oxide in free state or bonded state, which exists in a molten state, has extremely poor fluidity, seriously affects the fluidization state of the fluidized fluidized furnace, and the discharge is not smooth, and the furnace is easy to die

[0005] The molten matter formed by copper, lead and silicon dioxide is easy to stick to the water jacket, which reduces the heat transfer effect of the water jacket, resulting in a reduction in the processing capacity of the fluidized fluidized furnace and an increase in production costs

[0006] For the operation of the existing fluidized furnace, the measures to be taken are to control the ingredients, make the ratio of lead, copper, silicon, etc. reasonable, to ensure the normal operation of the fluidized furnace, and there is no fluidized furnace that can simultaneously process high copper, high lead and zinc concentrates

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