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Method for recovering zinc in waste residue containing zinc ferrite through ferric sulfate roasting-water leaching

A technology of ferric sulfate and zinc sulfate, applied in the intersection of metallurgical engineering and environmental engineering

Active Publication Date: 2014-05-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process can effectively overcome the shortcomings of high energy consumption and serious pollution in the volatilization kiln treatment of zinc leaching slag, as well as the disadvantages of high acid consumption and complicated purification process of the traditional hot acid leaching-iron sinking process, and has the advantages of simple process, low cost, energy saving and environmental protection

Method used

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  • Method for recovering zinc in waste residue containing zinc ferrite through ferric sulfate roasting-water leaching
  • Method for recovering zinc in waste residue containing zinc ferrite through ferric sulfate roasting-water leaching
  • Method for recovering zinc in waste residue containing zinc ferrite through ferric sulfate roasting-water leaching

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The mixed slag containing zinc ferrite from a smelter in Hunan is used as raw material, and its chemical composition is shown in the following table:

[0027] Fe

[0028] After uniformly mixing 100g of the above-mentioned mixed slag containing zinc ferrite and 2g-40g of ferric sulfate, roasting at a constant temperature of 600-700°C for 30-90min. The changes in the mass percentage of zinc in various forms and total zinc in the slag before and after roasting are as follows:

[0029] Element

[0030] It can be seen from the above that after the treatment of the present invention, most of the zinc ferrite in the waste residue has been decomposed and converted into zinc sulfate, and the decomposition rate has reached 87.76%. In addition, a small amount of zinc oxide, zinc sulfide, and zinc silicate in the waste residue is also converted into zinc sulfate, so that the mass ratio of zinc sulfate to the total zinc reaches 90.93%. The waste residue treated...

Embodiment 2

[0034] Taking zinc leaching slag from a smelter in Hunan as an example, its chemical composition is as follows:

[0035] Fe

[0036] After uniformly mixing 100 g of the zinc leaching slag containing zinc ferrite with 40-85 g of ferric sulfate, it is roasted at a constant temperature of 600-700° C. for 30-90 min. The changes in the mass percentage of zinc in various forms and total zinc in the slag before and after roasting are as follows:

[0037] Element

[0038] It can be seen from the above that after the treatment of the present invention, most of the zinc ferrite in the waste residue has been decomposed and converted into zinc sulfate, and the decomposition rate has reached 85.54%. In addition, a small amount of zinc oxide, zinc sulfide, and zinc silicate in the waste residue are also converted into zinc sulfate, so that the mass ratio of zinc sulfate to the total zinc reaches 89.08%. The waste residue treated by the present invention is leached with...

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Abstract

The invention discloses a method for recovering zinc in waste residue containing zinc ferrite through ferric sulfate roasting-water leaching. The waste residue containing zinc ferrite is mixed with a certain amount of ferric sulfate and then obtained mixture is roasted, so that the zinc ferrite is effectively decomposed and converted into zinc sulfate and ferric oxide; at the same time, little zinc, existing in the form of other substances such as zinc oxide, zinc sulfate and zinc silicate, in the waste residue can be converted into zinc sulfate under the condition, and is leached in a following washing process; the ferric oxide enters into leached slag, thus realizing zinc and iron separation; leachate, which is a zinc sulfate solution containing few impurity irons, can be directly returned to a hydrometallurgical process to recover zinc. The process disclosed by the invention is simple, environmental friendly and energy-saving, and the process effectively solves problems that a conventional wet hydrometallurgical process which is difficultly used to separate zinc and iron, is not high in zinc recovery rate, serious in environmental pollution and the like.

Description

technical field [0001] The invention belongs to the cross field of metallurgical engineering and environmental engineering, and in particular relates to a method for efficiently decomposing zinc ferrite and recovering zinc. Background technique [0002] Zinc is an important strategic basic material, and my country is the world's largest producer of zinc. At present, the conventional hydrometallurgy process of zinc is mainly oxidation roasting-leaching-electrodeposition. Zinc ore is often accompanied by 8-15% iron element, and this part of iron will inevitably react with zinc oxide to form zinc ferrite during the oxidation roasting process. Zinc ferrite (ZnFe 2 o 4 ) belong to the spinel type (AB 2 o 4 ), the crystal lattice is very stable, and it is generally difficult for acid and alkali to dissolve zinc, resulting in a low recovery rate of zinc and a large amount of waste residue containing zinc ferrite. These waste residues are difficult to deal with, and the amount...

Claims

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Application Information

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IPC IPC(8): C22B19/30C22B19/20
CPCY02P10/20
Inventor 柴立元彭兵胡明李燕春彭宁
Owner CENT SOUTH UNIV
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