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Method for zinc-iron separation by carrying out activated roasting and phase control on zinc ferrite

A zinc ferrite and roasting technology, which is applied in the direction of improving process efficiency, can solve the problems of zinc ferrite decomposition and zinc-iron separation without a good solution, zinc and iron resources cannot be effectively utilized, etc., to achieve roasting The effect of low temperature

Active Publication Date: 2014-10-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In summary, for zinc ferrite metallurgical waste residues, there is currently no good solution for the decomposition of zinc ferrite and the separation of zinc and iron, resulting in the ineffective use of zinc and iron resources in waste residues

Method used

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  • Method for zinc-iron separation by carrying out activated roasting and phase control on zinc ferrite
  • Method for zinc-iron separation by carrying out activated roasting and phase control on zinc ferrite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Grind 100g of acid leaching residue containing zinc ferrite to -200 mesh (74um) and account for more than 90%. Total Zinc 64.97%. Add 25g of ammonium sulfate and mix evenly, roast at 400°C for 1h, then raise the temperature of the roaster to 600°C for 30min, take it out and cool.

[0036]The roasted slag is leached with water at room temperature, the pH of the leaching solution is 5, the liquid-solid ratio is 6 / 1, and the leaching time is 15 minutes. After the leaching is completed, it is filtered and separated to obtain zinc-rich liquid and iron-rich slag. The zinc-enriched solution contained 19.7g / L of zinc and 0.31g / L of iron; the leaching rate of zinc was 91.52%, and the leaching rate of iron was 0.8%; the iron-rich slag contained 1.96% of zinc and 42.10% of iron.

Embodiment 2

[0038] Grind 100 g of mixed slag containing zinc ferrite until -200 mesh (74um) accounts for more than 90%. The contents of Zn and Fe in the slag are 14.96% and 23.06% respectively, and the content of zinc ferrite is 5.76%. Add 20g of ammonium sulfate and mix evenly, roast at 400°C for 1h, then raise the temperature of the roaster to 600°C for 30min, take it out and cool.

[0039] The roasted slag is leached with water at room temperature, the pH of the leaching solution is 7, the liquid-solid ratio is 8 / 1, and the leaching time is 15 minutes. After the leaching is completed, it is filtered and separated to obtain zinc-rich liquid and iron-rich slag. The zinc-enriched solution contained 18.05g / L of zinc and 0.24g / L of iron; the leaching rate of zinc was 87.25%, and the leaching rate of iron was 0.57%; the iron-rich slag contained 2.37% of zinc and 48.07% of iron.

Embodiment 3

[0041] Grind 100 g of goethite slag containing zinc ferrite until -200 mesh (74um) accounts for more than 90%. The contents of Zn and Fe in the slag are 9.56% and 35.42%, respectively, and the content of zinc ferrite is 5.52%. Add 30g of ammonium sulfate and mix evenly, roast at 400°C for 1h, then heat up the roasting furnace to 600°C for 30min, take it out and cool.

[0042] The roasted slag is leached with water at room temperature, the pH of the leaching solution is 7, the liquid-solid ratio is 5 / 1, and the leaching time is 20 minutes. After the leaching is completed, it is filtered and separated to obtain zinc-rich liquid and iron-rich slag. The zinc-enriched solution contained 23.51g / L of zinc and 0.46g / L of iron; the leaching rate of zinc was 92.76%, and the leaching rate of iron was 0.81%; the iron-rich slag contained 1.82% of zinc and 57.03% of iron.

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Abstract

The invention discloses a method for zinc-iron separation by carrying out activated roasting and phase control on zinc ferrite. The method comprises the following steps: adding ammonium sulfate to zinc ferrite metallurgical slag, and carrying out activated roasting to decompose zinc ferrite at 300-470 DEG C; roasting and controlling the phase of iron to be Fe2O3 at 480-670 DEG C; selectively leaching zinc in the leaching process to obtain zinc-rich liquid; and gathering iron into the slag to obtain an iron-rich material, wherein the zinc-rich liquid contains 20g / L of zinc and less than 0.5g / L of iron; the leaching rate of zinc under the optimal condition is greater than 92%; the leaching rate of iron is smaller than 0.8%; the iron-rich material contains less than 1% of zinc; the slagging rate of iron can be up to over 99%. By adopting the method, zinc and iron in the zinc ferrite metallurgical waste can be effectively recovered, and the method has good economic significance and environmental significance.

Description

Technical field: [0001] The invention belongs to the intersecting field of metallurgical engineering and environmental engineering, and relates to a method for zinc ferrite activation and roasting-phase control of zinc and iron separation, in particular to a method for decomposing zinc ferrite and separating zinc and iron from metallurgical waste slag containing zinc ferrite method. Background technique: [0002] my country is the world's largest producer of zinc. Zinc smelting mainly adopts the hydrometallurgy process, but when the zinc concentrate is oxidized and roasted in the hydrometallurgy process, the associated iron and zinc inevitably produce zinc ferrite. Zinc ferrite is stable in nature and will not decompose during neutral leaching or low-acid leaching, resulting in the loss of about 20% of zinc in the leaching slag. At present, the solutions to zinc ferrite produced in the zinc smelting process mainly adopt fire method and wet method. processing method. [000...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/06C22B19/30
CPCY02P10/20
Inventor 彭兵柴立元李燕春闵小波胡明彭宁李艳兰雷杰袁莹珍
Owner CENT SOUTH UNIV
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