Suspension smelting electric heating reduction furnace and method for smelting zinc concentrate

Abstract

The invention discloses a suspension smelting electric heating reduction furnace and a method for smelting zinc concentrate. The suspension smelting electric heating reduction furnace comprises a suspension smelting electric heating reduction furnace body, wherein a suspension smelting area and an electric heating reduction area are defined in the suspension smelting electric heating reduction furnace body, a separation wall is arranged between the suspension smelting area and the electric heating reduction area, and the bottom of the suspension smelting area is in communication with the bottom of the electric heating reduction area; an auxiliary burner, a material nozzle, an oxygen-containing gas spray gun and a smelting flue gas outlet are arranged on the smelting area; and an electrode,a reducing agent spray gun, a zinc-containing steam outlet, a slag discharge port and a metal melt outlet are arranged on the electric heating reduction area. Therefore, the suspension smelting electric heating reduction furnace can realize short flow and low energy consumption treatment of the zinc concentrate, and valuable metals such as lead, iron, silver, indium, and germanium are comprehensively recovered; moreover, the zinc element has the high direct yield rate; and meanwhile, obtained furnace slag has the low yield, and can be directly sold as general solid waste.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a suspension smelting electrothermal reduction furnace and a method for smelting zinc concentrate. Background technique [0002] Zinc metal is an important raw material for industry and agriculture. With the progress of society and the development of human beings, the world's demand for zinc resources is increasing rapidly, and the consumption of zinc raw materials is huge. At present, zinc smelting is mainly based on wet process. Zinc concentrate is leached after roasting or other means to obtain zinc sulfate solution, which is purified and electrolytically deposited to obtain cathode zinc flakes, and zinc casting to obtain Zn99.995 zinc ingots. This process has many steps, complex process, huge investment, and high energy consumption. The DC power consumption per ton of zinc in a single electrowinning process reaches 3000kWh. The most important thing is that the wet proc...

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Problems solved by technology

Blast furnaces and vertical tanks have high requirements on raw material composition and complex material preparation process; electric furnaces need to control the atmosphere and temperature in the furnace to prevent a large amount of reduction of iron; High zinc, low total zinc recovery

At present, except that the production capacity of a single blast furnace can reach more than 100,000 tons of zinc per year, the production capacity of a single series of vertical tanks and electric furnaces is only a few thousand tons per year, which cannot meet the requirements of modern large-scale industrial production at all.

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