Method for processing materials with high zinc, lead and bismuth through enriched-oxygen side-blown molten pool double-smelting furnace

Abstract

The invention relates to a method for processing materials with high zinc, lead and bismuth through an enriched-oxygen side-blown molten pool double-smelting furnace and belongs to the technical field of pyrometallurgy production. According to the method, the materials with high zinc, lead and bismuth are sent to an oxidization furnace body to be smelted, then high-temperature liquid zinc, lead and bismuth slag flows to a reduction furnace body through a chute, and the reduction process of three sections of slag feeding, reduction and slag discharging is strictly controlled; and the coal quantity is increased, so that the peroxide coefficient is controlled, and a high-temperature high-reduction atmosphere is built. The zinc element is rapidly reduced into the simple substance zinc in a reduction furnace, the boiling point of zinc is 907 DEG C, the temperature of the furnace is 1350 DEG C, and zinc enters smoke through high-temperature steam and is collected in a waste heat boiler and a dust collection bottom. When the zinc content of the smoke exceeds 60%, the smoke is sent to a zinc sulfate crystallization workshop, lead and zinc are separated, and a zinc product is made. Thus, the two furnaces are used for replacing three furnaces fundamentally, a fuming furnace is omitted, and the cost of recovering zinc is saved.

Description

Technical field [0001] The invention relates to a method for processing high-zinc-lead-bismuth materials with an oxygen-rich side-blown molten pool double smelting furnace, which belongs to the technical field of pyrometallurgical smelting production. Background technique [0002] At present, the more advanced methods adopted in the domestic treatment of high-zinc-lead-bismuth materials are the three-furnace metal smelting and separation of bottom blowing furnace + blast furnace + fuming furnace, and the triple furnace method of oxygen-enriched side blowing oxidation furnace + reduction furnace + fuming furnace. The former method is mature in industrial practice, but it cannot make good use of the high-temperature liquid high-zinc-lead-bismuth slag from the bottom-blowing furnace. It is necessary to cool this part of the heat before adding it to the blast furnace. In the same way, the cold water quenching slag continues to be added to the fuming furnace to recover high zinc. This...

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Problems solved by technology

The former method is mature in industrial practice, but it cannot make good use of the high-temperature liquid high-zinc-lead-bismuth slag flowing out of the bottom blowing furnace. It needs to cool this part of the heat before adding it to the blast furnace

Similarly, the cold water-quenched slag continues to be added to the fuming furnace to recover high zinc. This method has high heat consumption, poor environment, and low bed energy efficiency.

The latter method connects three furnaces. Although the heat utilization rate is high, the investment cost of setting up the fuming furnace is high. At the same time, the troubleshooting of the oxidation furnace and the reduction furnace will directly affect the normal operation of the fuming furnace.

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