Process for recovering zinc from tin-smelting electric furnace smoke

A technology for soot and electric furnace, applied in the field of comprehensive recovery of non-ferrous metal resources, can solve the problems of direct tin yield, increase in production cost, pollution of resources, loss, etc., and achieve the effects of increased yield, reduced production cost and easy operation.

Active Publication Date: 2014-10-01
YUNNAN CHENGFENG NON FERROUS METALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high temperature and strong reduction of the operating conditions of electric furnace tin smelting, 90% of the zinc (Zn) in the tin material will volatilize into the smoke and dust. The direct emission of smoke and dust will cause serious pollution and resource loss. The smoke and dust need to be recycled. During the re-smelting process of the electric furnace, 90% of the zinc (Zn) in the tin material is volatilized into the smoke, causing the zinc to circulate in the tin material, which greatly increases the direct yield of tin and the production cost

Method used

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  • Process for recovering zinc from tin-smelting electric furnace smoke

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Collect 0.5t of high-zinc-tin smoke dust produced in the electric furnace tin smelting, and the zinc-containing rate is 20% after testing. Add water with a solid-to-liquid volume ratio of 2 to 4 times, adjust the pH value to 4 to 6 with a pH adjusting solution, extract at a temperature of 80 to 90°C for 0.5 to 1 hour, and filter to obtain filtrate a; Inorganic acid leaching solution with a liquid volume ratio of 2 to 4 times and a pH value of 1 to 2 is extracted at a temperature of 80 to 90°C for 0.5 to 1 hour, and filtrate b is obtained by filtration; filtrate a and filtrate b are combined, and sodium carbonate is added to adjust the pH to 5 ~7, hydrolyze at a temperature of 50~70°C for 0.5~1h, and filter; the filter residue after hydrolysis and filtration is leached at a temperature of 80~90°C with an inorganic acid leach solution with a pH value of 1~2 and a solid-to-liquid volume ratio of 2~4 times After extracting for 0.5~1h and filtering, 420 Kg of tin slag was ob...

Embodiment 2

[0035] Collect 1 ton of high-zinc-tin fumes produced in electric furnace tin smelting, and the zinc content rate is 30% after testing. Add water with a solid-to-liquid volume ratio of 2 to 4 times, adjust the pH value to 4 to 6 with a pH adjusting solution, extract at a temperature of 80 to 90°C for 0.5 to 1 hour, and filter to obtain filtrate a; Inorganic acid leaching solution with a liquid volume ratio of 2 to 4 times and a pH value of 1 to 2 is extracted at a temperature of 80 to 90°C for 0.5 to 1 hour, and filtrate b is obtained by filtration; filtrate a and filtrate b are combined, and sodium carbonate is added to adjust the pH to 5 ~7, hydrolyze at a temperature of 50~70°C for 0.5~1h, and filter; the filter residue after hydrolysis and filtration is leached at a temperature of 80~90°C with an inorganic acid leach solution with a pH value of 1~2 and a solid-to-liquid volume ratio of 2~4 times After extracting for 0.5~1h and filtering, 709 Kg of tin slag was obtained and ...

Embodiment 3

[0037] 2 t of high-zinc-tin fume generated in electric furnace tin smelting was collected, and the zinc content rate was 25% after testing. Add water with a solid-to-liquid volume ratio of 2 to 4 times, adjust the pH value to 4 to 6 with a pH adjusting solution, extract at a temperature of 80 to 90°C for 0.5 to 1 hour, and filter to obtain filtrate a; Inorganic acid leaching solution with a liquid volume ratio of 2 to 4 times and a pH value of 1 to 2 is extracted at a temperature of 80 to 90°C for 0.5 to 1 hour, and filtrate b is obtained by filtration; filtrate a and filtrate b are combined, and sodium carbonate is added to adjust the pH to 5 ~7, hydrolyze at a temperature of 50~70°C for 0.5~1h, and filter; the filter residue after hydrolysis and filtration is leached at a temperature of 80~90°C with an inorganic acid leach solution with a pH value of 1~2 and a solid-to-liquid volume ratio of 2~4 times After extracting for 0.5~1h and filtering, 1515Kg of tin slag is obtained ...

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Abstract

The invention discloses a process for recovering zinc from tin-smelting electric furnace smoke. The process comprises the steps of multi-stage countercurrent extraction, hydrolysis, zinc deposition, roasting and impurity removal, and particularly comprises the following steps: collecting zinc-containing smoke, adding water and acid, leaching, and filtrating; performing hydrolysis on zinc-containing liquid obtained through leaching to enable impurities such as zinc to generate precipitation, separating, and roasting to obtain zinc oxide powder; obtaining precipitation through a hydrolysis procedure, performing impurity removal, leaching out impurity elements by acid, separating, returning slag with rich tin to an electric furnace shop after filtration, mixing with a zinc-containing material fed into an electric furnace, and recovering zinc through smelting in the electric furnace. According to the process, the multi-stage countercurrent extraction is adopted in the tin-smelting electric furnace smoke, so that the leaching rate of zinc in the smoke is improved, the consumption of acid is reduced, the zinc oxide powder is obtained, and all metallic elements in the smoke are comprehensively recovered; during metal recovering, waste gas and waste water cannot be produced, the smoke emission pollution is reduced while the comprehensive recovery of wastes is realized, the environment is protected, and the economic efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of comprehensive recovery of non-ferrous metal resources, and in particular relates to a process for recovering zinc from dust in an electric tin smelting furnace. Background technique [0002] Tin smelting in electric furnace (tin smelting in electric furnace) is the process of smelting tin concentrate in an electric furnace to produce crude tin, which is one of the smelting methods of tin concentrate. Electric furnace tin smelting has the characteristics of easy to reach high temperature (1723~1873K), strong reduction, high thermal efficiency, less furnace gas and smoke, etc. It is suitable for smelting tin concentrate with high tin content, low iron content or refractory tin. Due to the high temperature and strong reduction of the operating conditions of electric furnace tin smelting, 90% of the zinc (Zn) in the tin material will volatilize into the smoke and dust. The direct emission of smoke and dust w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/30C22B25/02C22B25/06
CPCY02P10/20
Inventor 杨富光万希立徐亚斌
Owner YUNNAN CHENGFENG NON FERROUS METALS
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