Fine-fraction high-silicon low-iron zinc concentrate fluidized bed roaster roasting treatment method

Abstract

The invention discloses a fine-fraction high-silicon low-iron zinc concentrate fluidized bed roaster roasting treatment method. The roasting treatment method comprises the following steps of (1) feeding fine-fraction high-silicon low-iron zinc concentrate into a fluidized bed roaster through a thrower; (2) controlling roasting parameters of the fluidized bed roaster by controlling a fan in front of the roaster and a combustion fan, so that the zinc concentrate is subjected to low-temperature oxidizing roasting at the temperature of 850-920 DEG C on a fluidized bed layer, and products being roasted sand, smoke dust and flue gas; and (3) discharging the roasted sand from an overflow port of the fluidized bed roaster, cooling and ball-milling the roasted sand, then feeding the roasted sand into a roasted sand bin, enabling smoke dust and flue gas to sequentially pass through a waste heat boiler, vortex dust collection equipment and electric dust collection equipment for waste heat recovery and smoke dust collection, enabling the generated waste heat to enter a steam pocket, and enabling the collected smoke dust to enter the roasted sand bin. The content of soluble silicon in the roasted product can be effectively reduced, the smoke dust rate is effectively reduced, the burden of equipment such as the waste heat boiler, vortex dust collection and electric dust collection is reduced, and the labor intensity of workers is reduced.

Description

technical field

[0001] The invention relates to the technical field of zinc smelting, in particular to a method for roasting a fine-grained high-silicon and low-iron zinc concentrate in a fluidized fluidized furnace. Background technique

[0002] There are two methods of zinc smelting to treat zinc sulfide concentrate: fire method and wet method. No matter it is wet method or fire method, the first step needs to roast the zinc sulfide concentrate. Fluidized fluidized furnace is widely used in zinc concentrates because of its large heat capacity, uniform distribution of thermal field, small temperature difference in various parts of the furnace, fast reaction speed, high roasting intensity, simple operation, and high heat and mass transfer efficiency between solid and gas. of roasting. Among them, temperature, air flow characteristics, and physical and chemical properties of zinc concentrate have a great influence on roasting reaction products such as calcined sand, smoke an...

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