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Zinc hydrometallurgical process

A technology of hydrometallurgy and process, applied in the direction of improving process efficiency, etc., can solve the problems of consumption of ammonium sulfate, economic unfeasibility, impact on zinc smelting process, etc., to save energy, reduce energy and resource consumption, and low cost Effect

Active Publication Date: 2016-02-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method cannot be directly used to deal with zinc calcined sand.
Because zinc calcine contains a large amount of zinc oxide, zinc ferrite is wrapped by zinc oxide, the gaseous product of ammonium sulfate decomposition first reacts with zinc oxide, and then reacts with zinc ferrite in zinc oxide, so a large amount of ammonium sulfate is consumed, not only It is not economically feasible, and a large amount of ammonia gas seriously affects the subsequent zinc smelting process

Method used

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  • Zinc hydrometallurgical process
  • Zinc hydrometallurgical process
  • Zinc hydrometallurgical process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Transfer the hot calcined sand after boiling and roasting the zinc concentrate to another roaster, and feed the mixed gas, and the mixed gas forms SO 2 / (SO 2 +O 2 ) volume ratio is 5%, 15%, 30%, 60%, 80%, heat preservation at 900°C for 60 minutes, and then close the mixed gas after the furnace temperature drops to 650°C, and heat preservation for 30 minutes to obtain heat preservation zinc calcine. The effect of mixed gas composition on the decomposition rate of zinc ferrite in thermal insulation zinc calcine is shown in Table 1.

[0017] Table 1 Effect of mixed gas composition on the decomposition of zinc ferrite

[0018]

[0019] It can be seen from Table 1 that when the mixed gas consists of SO 2 / (SO 2 +O 2 ) when the volume ratio is 60%, the decomposition rate of zinc ferrite is the highest, reaching 72.94%, and the content of zinc ferrite in the calcined sand is 4.05%.

Embodiment 2

[0021] Transfer the hot calcined sand after boiling and roasting the zinc concentrate to another roaster, and feed the mixed gas, and the mixed gas forms SO 2 / (SO 2 +O 2 ) with a volume ratio of 60%, keep warm at 900°C for 30, 60, 90, 120, and 150 minutes, turn off the mixed gas when the furnace temperature drops to 650°C, and take it out after holding it for 30 minutes to obtain heat preservation zinc calcine. The effect of holding time on the decomposition rate of zinc ferrite during aeration is shown in Table 2.

[0022] The impact of table 2 holding time on the decomposition of zinc ferrite

[0023]

[0024] It can be seen from Table 2 that the decomposition rate of zinc ferrite has reached the highest when the holding time of sulfur dioxide mixed gas is 90 minutes, reaching 73.74%. At this time, the content of zinc ferrite in the calcined sand is 3.93%.

Embodiment 3

[0026] will form SO in the gas mixture 2 / (SO 2 +O 2 ) with a volume ratio of 60%, 900°C for 60 minutes, and then turn off the mixed gas after the furnace temperature drops to 650°C. The heat preservation zinc calcined sand obtained under the condition of heat preservation for 30 minutes has a sulfuric acid content of 90g / L in the leaching solution, room temperature, and a liquid-solid mass ratio of The zinc sulfate leaching solution was obtained by leaching for 30 min under the condition of 10 / 1, and the zinc leaching rate and the iron content in the zinc sulfate leaching solution are shown in Table 3.

[0027] The existing zinc hydrometallurgy process directly cools the hot calcined sand after boiling and roasting the zinc concentrate, and measures the zinc ferrite content in the zinc calcined sand. The iron content in the leachate is shown in Table 3.

[0028] Table 3 The present invention compares with existing zinc hydrometallurgy process

[0029]

[0030] The resu...

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Abstract

The invention discloses a zinc hydrometallurgical process. The process comprises the following steps of: directly performing fluidized roasting on zinc concentrate so as to obtain hot roasted sand; introducing a gas mixture of sulfur dioxide and oxygen so as to perform heat preservation for the hot roasted sand; after heat preservation, performing weak-acid leaching for a moment so as to obtain zinc sulfate leaching liquid; purifying the zinc sulfate leaching liquid; and performing electrodeposition and electrolysis on the purified zinc sulfate leaching liquid. According to the zinc hydrometallurgical process disclosed by the invention, through the heat preservation on the hot roasted sand, the problem of zinc ferrite is solved; through weak-acid leaching for a moment, zinc in the heat-preserving roasted sand can be effectively extracted; sedimenting iron slag is not generated during leaching; leaching residues do not need to be treated by a high-temperature hot acid leaching and rotary-kiln reduction volatilization. The production cost of the zinc hydrometallurgical process is effectively reduced; the leaching condition of the zinc hydrometallurgical process is improved; the comprehensive reclaiming rate of zinc is increased; the harm of zinc smelting to the environment is reduced; the source emission reduction of the zinc hydrometallurgical process is realized.

Description

Technical field: [0001] The invention belongs to the intersecting field of metallurgical engineering and environmental engineering, and relates to a zinc hydrometallurgy process. Background technique: [0002] Iron is associated with zinc concentrate, and during the boiling roasting process, iron will react with zinc to form zinc ferrite. Zinc ferrite is stable in nature and will not decompose during neutral leaching or low-acid leaching, resulting in the loss of zinc in the form of zinc ferrite in the middle leaching residue. In order to improve the comprehensive recovery rate of zinc, the industrial use of rotary kiln reduction volatilization method or hot acid leaching method to decompose zinc ferrite. The rotary kiln reduction and volatilization method is to add the medium leaching slag to the reducing agent, and reduce the zinc ferrite to gaseous metal zinc at 1100-1200 ° C to obtain zinc oxide smoke and dust after volatilization. This method consumes a lot of energy,...

Claims

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Application Information

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IPC IPC(8): C22B19/02C22B1/10C22B3/08
CPCY02P10/20
Inventor 彭兵李燕春柴立元刘恢王忠兵闵小波
Owner CENT SOUTH UNIV