Method for linkage recovery of various kinds of solid waste materials in aluminum smelting process

A smelting process and aluminum recovery technology, applied in the field of fluorine-containing and aluminum-containing solid waste materials, can solve the problems of low product purity and added value, low recovery rate of fluorine and aluminum valuable elements, high reagent consumption and energy consumption, etc. Achieve the effects of improving economic and environmental benefits, high recovery rate, low reagent consumption and energy consumption

Active Publication Date: 2021-08-20
YUNNAN RUNXIN ALUMINUM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above recycling methods are mainly for the separate treatment or recycling of aluminum ash, carbon slag, cathode ash and other materials produced in the aluminum smelting process, and have not comprehensively considered the linkage of various solid wastes in the aluminum smelting process for the composition characteristics of various solid wastes recovery, and each method still has the disadvantages of low recovery rate of fluorine and aluminum valuable elements, low product purity and added value, high reagent consumption and energy consumption, etc.

Method used

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  • Method for linkage recovery of various kinds of solid waste materials in aluminum smelting process
  • Method for linkage recovery of various kinds of solid waste materials in aluminum smelting process
  • Method for linkage recovery of various kinds of solid waste materials in aluminum smelting process

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Effect test

Embodiment 1

[0101] The raw material of embodiment 1 and embodiment 2

[0102] Taking aluminum ash, cathode ash and carbon slag produced by an aluminum smelter in Yunnan as raw materials, the main components of each substance are as follows after fluorescence spectrum analysis:

[0103] Table 1. Main components of aluminum ash

[0104]

[0105] Table 2. Main components of cathode ash

[0106]

[0107]

[0108] Table 3. Main components of charcoal residue

[0109] element F Na Al Mg P S Cl K C Content (wt%) 37.11 15.56 8.84 0.27 0.04 3.64 0.15 1.64 26.52 element Ca V mn Fe co Ni Ga Sr O Content (wt%) 3.16 0.08 0.09 0.39 0.04 1.09 0.03 0.04 1.29

[0110] Example 1

[0111] (1) 100g of aluminum ash (composition as shown in Table 1), 10g of cathode ash (composition as in Table 2), and 100g of carbon slag (composition as in Table 3) were respectively crushed to -10mm (materials with a particle size below -10mm ...

Embodiment 2

[0132] (1) 90g of aluminum ash (composition as shown in Table 1), 10g of cathode ash (composition as in Table 2), and 100g of carbon slag (composition as in Table 3) were respectively crushed to -10mm (accounting for 95%) to meet the requirements of grinding Feeding granularity requirements;

[0133] (2) Mix the aluminum ash and cathode ash obtained in step (1) evenly in a mass ratio of 9:1, and dry-grind to -200 mesh by adopting a closed-circuit process of grinding and classification (materials with a particle size below -200 mesh) The mass accounts for more than 95% of the total material mass);

[0134] (3) The charcoal slag obtained in step (1) is wet-ground to -200 mesh (the quality of the material below -200 mesh accounts for more than 95% of the total material mass) with the grinding and classification closed-circuit process, and then adjusted Slurry, control the mass concentration of the slurry to be about 30%, add water glass, kerosene, and 2# oil flotation reagents i...

Embodiment 3

[0150] The raw material of embodiment 3

[0151] Taking aluminum ash, cathode ash and carbon slag produced by an aluminum smelter in Yunnan as raw materials, the main components of each substance are as follows after fluorescence spectrum analysis:

[0152] Table 6. Main components of aluminum ash

[0153] element Al Al 2 o 3

F Cl K Na S MgO CaO SiO 2

content(%) 4.35 66.32 9.14 0.05 0.39 9.49 0.25 0.20 3.36 3.79 element P Ba Sr Zr Cu mn Ni Fe 2 o 3

TiO 2

content(%) 0.02 0.02 0.01 0.01 0.01 0.01 0.01 2.30 0.27

[0154] Table 7. Main components of cathode ash

[0155] element F Na Al Mg P S Cl K C Content (wt%) 24.98 11.04 28.01 0.16 0.03 0.37 0.07 0.38 2.45 element Ca Ti mn Fe Ni Zr Ba Sr O Content (wt%) 2.12 0.22 0.02 3.46 0.02 0.01 0.01 0.01 26.64

[0156] Table 8. Main components of charcoal residue ...

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Abstract

The invention discloses a method for linkage recovery of various kinds of solid waste materials in an aluminum smelting process. Specifically, component characteristics of aluminum ash, cathode ash and carbon residues are fully utilized, linkage recovery of various kinds of solid waste materials in the aluminum smelting process is comprehensively considered, the recovery rate of valuable elements of fluorine and aluminum is high (90 percent or higher), the product purity is high (the purity of a mixture of main products AlF3 and Al2O3 is 98 percent or higher), the method can be used for an aluminum electrolysis process, the whole technical profit additional value is high, reagent consumption and energy consumption are small, the ecological environment protection is facilitated, the material consumption and cost are effectively reduced, and economic benefits and environmental benefits of the solid waste material recovery are improved.

Description

technical field [0001] The invention relates to a treatment method for linked recovery of solid waste materials such as carbon slag, cathode ash and aluminum ash produced in the aluminum smelting process, in particular for recovering fluorine-containing and aluminum-containing solid waste materials produced in the aluminum smelting process. Background technique [0002] During the aluminum smelting process, the main hazardous wastes produced include aluminum ash, carbon slag, cathode ash, etc. Aluminum ash is the slag and floating skin produced in the process of aluminum liquid, aluminum ingot, and secondary aluminum smelting and refining aluminum. It mainly comes from the remelting and casting process of electrolytic aluminum plants, aluminum processing plants, and secondary aluminum plants. Generally, about 20-40kg of aluminum ash is produced per ton of primary aluminum processed, and its main components are metal aluminum, alumina (about 30%-70% by mass), silicon dioxide,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B7/04C22B1/00C22B21/00C01D5/06C01F7/02C01F7/26C01F7/50
CPCC22B7/02C22B7/04C22B7/006C22B7/007C22B1/00C22B21/0023C01F7/50C01F7/02C01F7/26C01D5/06C01P2004/80Y02P10/20
Inventor 林艳杨万章崔焱刘丹王皓逸马路通邓聪
Owner YUNNAN RUNXIN ALUMINUM
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