Method and smelting furnace for processing high-speed iron polymetallic zinc concentrate

Abstract

The invention relates to a method and a smelting furnace for processing a high-iron multi-metal zinc concentrate. The method comprises the following steps of: adding the zinc concentrate which contains the following components in percentage by weight: 16%-24% of Fe, 0.02-0.40% of In, 0.2%-2.0% of Cu, 0.004%-0.04% of Ag and 36%-48% of Zn to the smelting furnace, successively carrying out three processes including oxygen-enriched oxidation smelting, weak reduction smelting and strong reduction smelting to product sulfur dioxide fume, a copper-silver alloy, smelting slag and zinc-indium smoke dust, wherein the sulfur dioxide fume is used for preparing sulfuric acid, the smelting slag is externally sold, the copper-silver alloy is separated to extract copper and silver, and the zinc-indium smoke dust is subjected to neutral leaching to obtain a neutral leaching solution and neutral leaching residues; producing electrolytic zinc through the neutral leaching solution according to a conventional process; carrying out two-stage acid counter current leaching on the neutral leaching residues to obtain a low-acid leaching solution and high-acid leaching residues; returning the high-acid leaching residues to the smelting furnace for smelting, producing fine indium by using the low-acid leaching solution according to a conventional P204 extraction process, and returning extraction raffinate to neutral leaching. The method disclosed by the invention has the advantages of short process flow, high production efficiency, low production cost, good integrated recovery and clean and environment-friendly production process.

Description

technical field [0001] The invention relates to the technical field of non-ferrous metal smelting, in particular to a method and a smelting furnace for processing high-iron polymetallic zinc concentrate. It is suitable for processing high-iron polymetallic zinc concentrates containing Fe16-24%, In0.02-0.40%, Cu0.2-2.0%, Ag0.004-0.04%, Zn36-48%. Background technique [0002] At present, high-iron polymetallic zinc concentrates containing Fe16-24%, In0.02-0.40%, Cu0.2-2.0%, Ag0.004-0.04%, Zn36-48% are processed to extract zinc and recover various valuable There are three main methods of metal treatment: [0003] The first treatment method is to use the conventional leaching wet process. The process adopts "roasting and desulfurization of zinc concentrate fluidized furnace--two-stage countercurrent leaching of zinc calcined sand with neutral and low acidity--extraction of copper and cadmium by replacement of medium and supernatant solution--production of electrolytic zinc by ...

AI Technical Summary

Problems solved by technology

The main disadvantages of this treatment method are: (1) the primary leaching rate of zinc is low, the processing capacity of the volatilization kiln is large, and a large amount of coal char needs to be consumed; (2) when the volatilization kiln processes floating silver tailings, the output of sulfur dioxide flue Only after treatment can the national emission standard be reached; (3) the recovery rate of various valuable metals is low, the recovery rate of indium is 75%, the recovery rate of copper is 80%, and the recovery rate of silver is 40%, which seriously affects the benefit

The main disadvantages of this method are: (1) a large amount of electric energy and reduced coal are consumed in the reduction smelting process of the electric furnace, and the production cost is high; (2) due to the strong reduction smelting of the electric furnace, the concentration of carbon monoxide is very high during the process, and there are carbon monoxide poisoning and electric furnace bleed air Potential safety hazard of explosion; (3) there is no good method for the treatment of copper-silver pig iron, and copper, silver and pig iron cannot be recovered at the same time; (4) the smelting recovery rate of indium and silver is low, and the recovery rate of indium is 75%, and the The recovery rate is 50%, which affects the economic benefits

The main disadvantages of this method are: (1) the amount of jarosite slag and high leaching slag is large, and a large amount of coke needs to be consumed when the rotary kiln is reduced and volatilized, and the production cost is high; It contains a large amount of sulfate radicals, and a large amount of sulfur dioxide gas is decomposed during the reduction and volatilization process of the rotary kiln. The reduction and volatilization flue gas needs to be absorbed and treated before it can be discharged up to the standard

(3) The smelting recovery rate of indium and silver is low, the recovery rate of indium is 80%, and the recovery rate of silver is 30%, which affects the economic benefits

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