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Method for efficiently removing cyanofluoride from electrolytic aluminum overhaul slag

A technology of overhaul slag and electrolytic aluminum, which is applied in the field of electrolytic aluminum overhaul slag to remove cyanide and fluoride, can solve the problem that most of cyanide and fluoride in overhaul slag cannot be leached, cannot be removed, and can not be achieved. Harmful and other issues, to achieve the effect of improving the utilization rate of ozone, shortening the processing time, and improving the grinding efficiency

Inactive Publication Date: 2021-05-28
河南资环矿业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process also uses clean water to directly leach the overhaul slag for 15-25 minutes. The leaching time of this process is relatively short, and it is impossible to achieve the leaching of most of the cyanide and fluoride in the overhaul slag into the leachate, and add calcium hydroxide and chlorine to stir the leachate. It is impossible to remove fluoride and cyanide that have not been immersed in the leaching solution. As a result of the final treatment, the overhaul slag cannot be harmless. This method has low efficiency and high cost

Method used

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  • Method for efficiently removing cyanofluoride from electrolytic aluminum overhaul slag

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Embodiment 1

[0032] In an embodiment of the present invention, a method for removing cyanofluoride from overhaul slag is provided, which specifically includes the following steps:

[0033] S1. Weigh 20g of fluorine-fixing agent, 600g of overhaul slag raw ore (toxicity analysis of leachate: fluoride ion content 6370mg / L, hydrogen cyanide ion content 33mg / L) and 360g of clean water and put them into the ball mill together. Based on the wet grinding leaching process, The ball mill is used for wet grinding and fluorine-fixing treatment of overhaul slag to obtain overhaul slag slurry;

[0034] Specifically: the fluorine-fixing agent uses powdered quicklime with a calcium oxide purity of more than 90% to play a grinding-aiding and fluorine-fixing effect in the above-mentioned wet grinding; when the fineness of the overhaul slag is -0.075mm, it accounts for 90-100% Grinding is completed at this time, and the overhaul slag slurry is discharged.

[0035] S2. Dilute the overhaul slag slurry in step...

Embodiment 2

[0040] In an embodiment of the present invention, a method for removing cyanofluoride from overhaul slag is provided, which specifically includes the following steps:

[0041] S1. Weigh 20g of fluorine-fixing agent, 600g of overhaul slag raw ore (toxicity analysis of leachate: fluoride ion content 6370mg / L, hydrogen cyanide ion content 33mg / L) and 360g of clean water and put them into the ball mill together. Based on the wet grinding leaching process, The ball mill is used for wet grinding and fluorine-fixing treatment of overhaul slag to obtain overhaul slag slurry;

[0042] Specifically: the fluorine-fixing agent uses powdered calcium chloride with a calcium oxide purity of more than 90% to play a grinding-aiding and synergistic effect of fluorine-fixing in the above-mentioned wet grinding; Grinding is completed at 100%, and the overhaul slag slurry is discharged.

[0043]S2. Dilute the overhaul slag slurry in step S1 to 15% with clear water, pour it into the advanced oxida...

Embodiment 3

[0048] In an embodiment of the present invention, a method for removing cyanofluoride from overhaul slag is provided, which specifically includes the following steps:

[0049] S1. Weigh 40g of fluorine-fixing agent, 600g of overhaul slag raw ore (toxicity analysis of leachate: fluoride ion content 6370mg / L, hydrogen cyanide ion content 33mg / L) and 360g of clean water and put them into the ball mill together. Based on the wet grinding leaching process, The ball mill is used for wet grinding and fluorine-fixing treatment of overhaul slag to obtain overhaul slag slurry;

[0050] Specifically: the fluorine-fixing agent uses powdered quicklime with a calcium oxide purity of more than 90% to play a grinding-aiding and fluorine-fixing effect in the above-mentioned wet grinding; when the fineness of the overhaul slag is -0.075mm, it accounts for 90-100% The ore grinding is completed at this time, and the overhaul slag slurry is discharged.

[0051] S2. Dilute the overhaul slag slurry...

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Abstract

The invention belongs to the technical field of overhaul slag treatment, and discloses a method for efficiently removing cyanofluoride from electrolytic aluminum overhaul slag, which comprises the following steps of: S1, crushing the electrolytic aluminum overhaul slag by using a crusher until the particle size is less than 60mm; S2, adding a fluorine fixing agent, the overhaul slag and clear water into the ball mill according to the mixing mass ratio of (1-5): 30: 18, carrying out mixing and ore grinding, and meanwhile carrying out fluorine fixing; S3, diluting the ore pulp in the step S2 with clear water until the concentration is 15%-40%, pouring the diluted ore pulp into an advanced oxidation reaction container of an ozone micro-nano generator, starting the ozone generator, introducing ozone into the leached slurry, and continuing to stir for reaction; and S4, carrying out solid-liquid separation on the ore pulp reacted in the step S3, and adding a separated liquid phase and a part of solid phase into the ore pulp obtained by ore grinding in the step S2. Compared with the prior art, the method provided by the invention comprises the four steps of crushing, ore grinding and fluorine fixing, micro-nano ozone cyanogen removal and solid-liquid separation, and has the advantages of simple process, short flow, high efficiency, low cost and the like.

Description

technical field [0001] The invention belongs to the technical field of electrolytic aluminum overhaul slag treatment, and in particular relates to a method for removing cyanofluoride from electrolytic aluminum overhaul slag. Background technique [0002] In the electrolytic aluminum industry, the aluminum electrolytic cell generally needs to be overhauled after 5-6 years of use, and the waste lining removed in the electrolytic cell during the overhaul is the overhaul slag of the electrolytic cell. [0003] Because the overhaul slag contains a large amount of soluble fluoride and cyanide, it is classified as hazardous waste by the national environmental protection department; at present, the main domestic treatment methods for overhaul slag are the following: fire method, wet method, stockpiling, landfill and delivery Hazardous Waste Center. Among them, stockpiling and landfilling have not achieved harmless treatment. Now the country does not allow this kind of treatment met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/33A62D101/49A62D101/45
CPCA62D3/33A62D2101/45A62D2101/49A62D2203/02
Inventor 周杰强马智敏严育红张迎杰陈顺佼
Owner 河南资环矿业科技有限公司
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