Method for preparing aluminum fluoride product through combined treatment of multiple wastes and aluminum fluoride product

A combined treatment and aluminum fluoride technology, applied in the direction of aluminum fluoride, aluminum halide, etc., can solve the problems of inability to realize resource utilization, waste of valuable acids and aluminum salts, etc., and achieve convenient operation, high feasibility, and aluminum oxide The effect of low content

Pending Publication Date: 2021-10-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In industry, the acid-base neutralization method is often used to treat the waste water. In fact, the acid anodic oxidation waste water contains a large amount of acid and a certain amount of aluminum salt (generally, H 2 SO

Method used

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  • Method for preparing aluminum fluoride product through combined treatment of multiple wastes and aluminum fluoride product
  • Method for preparing aluminum fluoride product through combined treatment of multiple wastes and aluminum fluoride product
  • Method for preparing aluminum fluoride product through combined treatment of multiple wastes and aluminum fluoride product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The steps of the method for treating waste electrolytes containing fluorine in this embodiment are as follows:

[0052] (1) Take 16.00g of waste electrolyte powder from an electrolytic aluminum plant (XRF fluorescence analysis: F 49.68wt.%, Na21.48wt.%, Al 14.48%, Ca 5.46, K 5.13wt.%, O 2.59wt.%, Mg 0.57wt.%, S0.18wt.%), aluminum ash powder 3.20g (Al content 32.15wt.%), aluminum anodic oxidation wastewater 200ml (H 2 SO 4 The concentration is 200g / L, Al 3+ ion concentration is 15g / L), after mixing, ball milling and leaching for 1h in a ball milling tank, wherein the ball milling speed is 350r / min; then filter, and slowly add 4mol / L sodium hydroxide solution in the resulting filtrate, so that the pH of the solution is 3.5 stop, filter and dry to obtain 22.54 g of aluminum hydroxyfluoride hydrate precipitate and filtrate; the filtrate evaporates and crystallizes to obtain 39.72 g of mixed salt with sodium sulfate as the main phase.

[0053] (2) Mix 30.00 g of ammonium ...

Embodiment 2

[0062] Repeat Example 1, the difference is only: change the spent electrolyte powder into flotation cryolite (XRF analysis: F47.32wt.%, Na 22.37wt.%, Al 14.73%, Ca 6.75, K 4.91wt.% in the step (1) %, O 3.11wt.%, Mg0.42wt.%, S 0.13wt.%), the resulting aluminum hydroxyfluoride and aluminum fluoride products are detected, and the results are shown in Table 1 and Table 2.

Embodiment 3

[0064] Repeat Example 1, the only difference being: change the ammonium bifluoride in step (2) to 40.00 g of sodium bifluoride, wash the product after roasting and cooling, filter, and bake at 100° C. for 5 hours to obtain the aluminum fluoride product. Evaporate and crystallize the washing liquid obtained by washing with water to obtain the sodium fluoride product.

[0065] Gained aluminum hydroxyfluoride and aluminum fluoride products are detected, and the results are shown in Table 1 and Table 2.

[0066] The relevant process parameter of each embodiment of table 1 and the detection result situation of target substance content in relevant product

[0067]

[0068] Table 2 Contents of some elements in hydrated aluminum hydroxyfluoride and aluminum fluoride products

[0069]

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Abstract

The invention relates to a method for preparing an aluminum fluoride product through combined treatment of multiple wastes and the aluminum fluoride product. The method comprises mixing and leaching fluorine-containing waste particles, aluminum ash powder and to-be-treated aluminum anodic oxidation wastewater, and then performing solid-liquid separation to obtain leachate and filter residues; adjusting the pH value of the leachate to 3-5, carrying out solid-liquid separation to obtain a solid phase, drying the solid phase to obtain aluminum hydroxyfluoride powder, uniformly mixing the aluminum hydroxyfluoride powder with a reactant, and carrying out heat treatment to obtain a heat treatment product; when the reactant comprises at least one of potassium hydrogen fluoride, sodium hydrogen fluoride and lithium hydrogen fluoride, washing and drying the heat treatment product to obtain an aluminum fluoride product; when the reactant is composed of at least one of ammonium fluoride and ammonium bifluoride, determining that the heat treatment product is the aluminum fluoride product. According to the method, fluorine-containing waste, aluminum ash and aluminum anodic oxidation waste water in the aluminum smelting and processing industry are integrated, valuable aluminum and fluorine elements are efficiently recycled in the form of aluminum hydroxyfluoride, the process is simple, and the feasibility is high.

Description

technical field [0001] The invention relates to a method for preparing aluminum fluoride products through combined treatment of multiple waste materials and the aluminum fluoride products, belonging to the field of waste resource treatment. Background technique [0002] Aluminum fluoride is an important additive in the smelting industry. In the process of aluminum electrolysis, it is necessary to continuously add aluminum fluoride to the electrolytic cell to maintain a constant electrolyte molecular ratio and ensure the stable operation of the electrolytic cell. At present, aluminum fluoride is mainly based on fluorite (CaF 2 ) as raw material for production. Although my country has a high reserve of fluorite, accounting for 13.5% of the world's total reserve, the rapid development of downstream industries such as electrolytic aluminum in recent years has made the raw material gap of fluorite increase year by year. This has also led to higher aluminum fluoride prices, incr...

Claims

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Application Information

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IPC IPC(8): C01F7/50
CPCC01F7/50C01P2002/72C01P2006/80
Inventor 吕晓军韩泽勋罗丽琼吴勇聪蒿鹏程
Owner CENT SOUTH UNIV
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