Method and device for recovering valuable elements from lead-silver-bismuth slag in copper smelting

Abstract

The invention belongs to nonferrous metal metallurgy industry, and particularly relates to a method and device for recovering valuable elements (lead, gold, silver, bismuth, copper, arsenium and sulfur) from lead-silver-bismuth slag in copper smelting. The method comprises the following steps: adding lead-silver-bismuth slag, copper slag, reducer and slagging flux through a feed port at the upper part of a bottom-blowing alloying furnace, performing reduction reaction under high-temperature conditions to generate metal lead, metal bismuth and copper matte; under the stirring action of high-pressure gas supplied by a submerged combustion device at the bottom, continuously blowing and dispersing the molten lead deposited at the bottom to the molten mass at the upper part, and using the molten lead to continuously trap gold, silver and bismuth to obtain a lead-bismuth alloy which is rich in gold and silver; and under the action of iron chips and the reducer at high temperature, forming copper in the lead-silver-bismuth slag into copper matte, wherein the copper matte is enriched with arsenium. The method provided by the invention is high in smelting strength, high in operating efficiency, high in metal recovery rate, favorable in device sealing property, low in heat loss, low in energy consumption, high in automation level, low in labor intensity, favorable in stability and convenient to operate, and can realize converter tipping quickly.

Description

technical field [0001] The invention belongs to the metallurgy industry of non-ferrous metals, and in particular relates to a method and a device for recovering several valuable elements including lead, gold, silver, bismuth, copper, arsenic and sulfur from lead, silver and bismuth slag of copper smelting. Background technique [0002] Lead-silver-bismuth slag from copper smelting mainly contains valuable elements such as lead, gold, silver, bismuth, copper, arsenic, and sulfur. At present, the processing method of this kind of lead-silver-bismuth slag at home and abroad is mainly the method of producing lead-bismuth alloy by blast furnace smelting. The lead-bismuth alloy is electrolyzed to obtain refined lead and anode slime rich in bismuth, gold, silver and other valuable metals. Anode slime separates various metals by wet or pyro process. [0003] Due to the difficulty of flue gas pollution control and relatively high energy consumption in the blast furnace smelting pro...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of difficulty in flue gas pollution control, high energy consumption, low operating efficiency, poor stability, and low metal recovery rate in the traditional blast furnace technology for processing lead, silver, and bismuth slag, and provide lead and silver smelted from copper. A method and device for recovering valuable elements from bismuth slag; the production process of the method is to simultaneously supply oxygen and fuel into the melt in the furnace through the gas submerged combustion device installed at the bottom of the bottom-blown alloy furnace, and at the same time pass through the upper part of the bottom-blown alloy furnace Lead, silver, bismuth slag, copper slag, reducing agent and slagging flux are added to the feeding port; oxygen and fuel are burned to release heat to melt the added materials, and maintain the heat demand of the smelting process. Under the reduction of high-temperature coal particles, lead Lead sulfate and bismuth sulfate in silver-bismuth slag react with iron filings and copper to produce metal lead, metal bismuth and copper matte; under the agitation of the high-pressure gas supplied by the bottom immersion combustion device, the lead liquid deposited at the bottom is continuously blown up Dispersed into the upper melt, through the continuous capture of gold, silver and bismuth by the lead liquid, the lead-bismuth alloy rich in gold and silver is obtained; the copper in the lead-silver-bismuth slag is formed under the action of high temperature, iron filings and reducing agent Copper matte, copper matte is a eutectic sulfide of copper and iron; the arsenic in the lead-silver-bismuth slag is mainly enriched in the copper matte, and a small amount is dispersed in the lead-bismuth alloy

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