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Method for selectively leaching zinc in zinc ferrite-containing waste residues through mechanical activation and directional reduction

A mechanical activation, waste residue technology, applied in the direction of improving process efficiency, can solve the problems of waste, land occupation by zinc leaching residue, environmental threat of iron vanadium residue, etc., to reduce the generation of hazardous waste, reduce time and cost, and solve the problem of iron The effect of alum slag

Active Publication Date: 2021-08-13
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Iron vanadium slag contains a large amount of valuable metals such as Ga, Ge, In, Ag and Fe, so the zinc calcine has not been effectively treated, not only wasting a lot of valuable metal resources such as Ga, Ge, In, Ag and Fe, but also The resulting zinc leaching slag will occupy a large amount of land, and the final iron-vanadium slag also poses a serious threat to the environment
For example, Chinese patent CN101748289 A discloses a neutral leaching method for zinc hydrometallurgy. Although the leaching rate of zinc in this method can reach 75% and the amount of slag is less, the acid concentration used is as high as 180 g / L
[0003] In the zinc pyrometallurgy process, zinc ferrite can be destroyed by C, SO 2 etc. reduced to Fe 3 o 4 and ZnO, but the method is easily reduced to ZnO and FeO or ZnO and Fe
Chinese patent CN 103276197 A discloses a method for flash reduction roasting of zinc calcine. Although this invention improves the problem of high energy efficiency and can realize rapid and complete decomposition and reduction of zinc ferrite in zinc calcine (1 to 3 s), it still There is a restore problem

Method used

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  • Method for selectively leaching zinc in zinc ferrite-containing waste residues through mechanical activation and directional reduction
  • Method for selectively leaching zinc in zinc ferrite-containing waste residues through mechanical activation and directional reduction

Examples

Experimental program
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Effect test

Embodiment 1

[0030] In this embodiment, the zinc in the zinc calcined sand is selectively leached through the mechanical activation method, and the flow process is as follows: figure 2 shown.

[0031] (1) Combine zinc calcine with Na 2 SO 3 Add the ratio of 50 g : 0.04 mol into the zirconia ball mill jar for mechanical activation together, add ball mill balls according to the ball-to-material ratio of 1 : 2, set the frequency to 30 Hz, and obtain mixture A after ball milling for 4 h; prepare a certain volume concentration of 50 g / L of H 2 SO 4 The solution is used as the leaching solution. According to the solid-liquid ratio of 100 g / L (the ratio of the mass of zinc calcine to the volume of the leaching solution), weigh a certain amount of mixture A, and slowly add the weighed mixture A to H under stirring. 2 SO 4 In the solution, mixed system B was obtained after 120 min of reaction;

[0032](2) After suction filtration and drying, the leaching amount of zinc was 28.36 g, and the l...

Embodiment 2

[0034] In this embodiment, the zinc in the zinc calcined sand is selectively leached through the mechanical activation method, and the flow process is as follows: figure 2 shown.

[0035] (1) Combine zinc calcine with Na 2 SO 3 Add 50 g: 0.04 mol into the spherical zirconia grinding tank together for mechanical activation, add ball milling balls according to the ball-to-material ratio of 1:2, set the frequency at 30 Hz, and obtain mixture A after ball milling for 2 h; prepare a certain volume of concentration H at 60 g / L 2 SO 4 The solution is used as the leaching solution. According to the solid-liquid ratio of 100 g / L (the ratio of the mass of zinc calcine to the volume of the leaching solution), weigh a certain amount of mixture A, and slowly add the weighed mixture A to H under stirring. 2 SO 4 In the solution, mixed system B was obtained after 120 min of reaction;

[0036] (2) After suction filtration and drying, the leaching amount of zinc was 31.24 g, and the lea...

Embodiment 3

[0038] In this embodiment, the zinc in the zinc calcined sand is selectively leached through the mechanical activation method, and the flow process is as follows: figure 2 shown.

[0039] (1) Combine zinc calcine with Na 2 SO 3 Add the ratio of 50 g : 0.04 mol into the zirconia ball mill jar for mechanical activation together, add ball mill balls according to the ball-to-material ratio of 1 : 2, set the frequency to 30 Hz, and obtain mixture A after ball milling for 4 h; prepare a certain volume concentration of 60 g / L H 2 SO 4 solution, according to the solid-to-liquid ratio of 100 g / L (the ratio of the mass of the zinc calcine to the volume of the leaching solution), weigh a certain amount of mixture A, and slowly add the weighed mixture A into the sulfuric acid solution under stirring, and react Mixed system B was obtained after 120min;

[0040] (2) After suction filtration and drying, the leaching amount of zinc was 33.15 g, and the leaching rate of zinc was calculat...

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Abstract

The invention discloses a method for selectively leaching zinc in zinc ferrite-containing waste residues through mechanical activation and directional reduction. According to the method, zinc ferrite lattices in the waste residues are subjected to distortion and defects through mechanical activation, the zinc ferrite is directionally reduced into ZnO which is easy to dissolve in acid and Fe3O4 which is not easy to dissolve in acid, the zinc enters a solution, and the iron is left in the residues. By means of the method, zinc leaching is selectively achieved, hazardous waste is reduced, the zinc smelting time is shortened, the zinc smelting cost is reduced, Zn < 2 + > is leached to the maximum extent under the low acid concentration, iron is left in the residues in the form of ferroferric oxide, and therefore the problem of jarosite slag in the zinc hydrometallurgy process is solved from the source.

Description

technical field [0001] The invention relates to a wet zinc smelting technology, in particular to a method for selectively leaching zinc in waste slag containing zinc ferrite through mechanical activation and directional reduction. Background technique [0002] Zinc smelting mainly includes fire method and wet method. Among them, more than 80% of the zinc smelting adopts the wet method, using the "roasting-leaching-purification-electrodeposition" process. The zinc concentrate is roasted in a fluidized fluidized furnace to obtain zinc calcine, and zinc ingots are obtained after leaching, purification and electrodeposition. The main components of zinc calcine include zinc ferrite (ZnFe 2 o 4 ), ZnO, among which ZnO is easily soluble in acid and can be leached at a lower acid concentration. Therefore, in the process of zinc hydrometallurgy, the existence of zinc ferrite is the main reason for the low zinc leaching rate. ZnFe 2 o 4 It is a spinel structure with relatively s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/20C22B1/00C22B7/00C22B7/02
CPCC22B19/22C22B1/005C22B7/007C22B7/02Y02P10/20
Inventor 陈梦君陈绍勤舒建成王蓉胡玲雷天涯
Owner SOUTHWEAT UNIV OF SCI & TECH
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