A process for resource utilization of zinc, lead and silver slag in hydrometallurgy

Abstract

Provided is a technique for resource utilization of lead and silver residues for zinc hydrometallurgy. The technique comprises the steps that the dried lead and silver residues, lead concentrate and additives are blended, so that a mixture is obtained; the mixture is fed to an oxygen-enriched bottom-blowing furnace for oxidation smelting after being subjected to granulation, and primary lead and furnace residues are separated out; the furnace residues are fed into an oxygen lateral blowing metal smelting reduction furnace, broken coal and a flux are added to the oxygen lateral blowing metal smelting reduction furnace, so that furnace residues of the oxygen lateral blowing metal smelting reduction furnace are formed; the furnace residues are fed into a fuming furnace to obtain secondary lead; as for silver entering the primary lead and the secondary lead, anode mud is added in the electrolytic lead refining process of the primary lead and the secondary lead, and the silver is extracted from the anode mud; and as for zinc and lead entering smoke of the fuming furnace, the smoke is subjected to defluorination and dechlorination, zinc is obtained through hydrometallurgical leaching and extracted through electrodeposition, the lead is in the leaching residues, and then the lead is recovered through lead smelting. The technique is simple, the recovery rate of the lead in the lead and silver residues is about 95%, the zinc recovery rate is about 90%, the silver recovery rate is about 95%, and the sulfur utilization rate is about 90%.

Description

technical field [0001] The invention belongs to the field of nonferrous smelting, and relates to a resource utilization process of zinc, lead and silver slag in hydrometallurgy. Background technique [0002] In the high-temperature high-acid leaching process of zinc hydrometallurgy, lead and silver are enriched in the high-temperature high-acid leaching slag, which is called lead-silver slag. The rate of lead-silver slag varies greatly depending on raw materials and processes, and is about 20%-40%. , The approximate weight content of each component in the lead-silver slag is: Zn 2.5-6%, Fe 8-18%, lead 7-15%, silver 300-700g / t, sulfur 8-11%. [0003] The rotary kiln volatilization process is to add 40%-50% fuel (coke powder, coal, anthracite) to the filtered lead and silver slag, and add it to the rotary kiln for treatment. The temperature of the furnace gas in the kiln is generally controlled at 1000-1100 ℃, during the volatilization process of the rotary kiln, the processe...

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Problems solved by technology

Most of the metals in the lead-silver slag exist in the form of regenerated compounds, so the recovery rates of Pb, Zn, and Ag in the flotation process are not ideal. The final test results show that the highest recovery rate of Pb in the flotation process is only 58%, and the recovery rate of Zn is only 58%. rate of 10% to 15%, and flotation tailings are still hazardous waste