Green alkali metal removing method for aluminum and aluminum melt

A technology for aluminum melt and alkali metal, which is applied in the field of green alkali metal removal for aluminum and aluminum melt, and can solve problems such as environmental pollution, equipment atmosphere, and soil hazards

Active Publication Date: 2021-09-10
FUJIAN METAL NEW ALU TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the chlorine-containing tail gas and fluorine-containing waste residue in the process of removing alkali metals cause serious harm to human body, equipment, workshop, atmosphere, soil, etc., and become an important factor of environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] This embodiment provides a green method for removing alkali metals from aluminum and aluminum melts, comprising the following steps:

[0048] S1. Mix high-purity oxygen and inert gas in proportion to form a mixed gas;

[0049] S2. Pass the mixed gas described in step S1 into a furnace or refining equipment, and fully mix to form a dispersed mixed gas;

[0050] S3. Entering the dispersed mixed gas in step S2 into the aluminum melt and diffusing in the aluminum melt, the alkali metal of the aluminum melt reacts with the oxygen in the dispersed mixed gas to form oxides , floating out of the surface of the aluminum melt.

[0051] A 15-ton smelting furnace melted A3105 aluminum alloy, sampled and analyzed, and the direct-reading spectrometer was used to detect that the total content of alkali metal in the melt was 20ppm, and a nitrogen-oxygen mixed gas with a content of 20% oxygen was introduced into the smelting furnace through a refining tube, of which The mixed gas need...

Embodiment 2

[0053] S1. Mix high-purity oxygen and inert gas in proportion to form a mixed gas;

[0054] S2. Pass the mixed gas described in step S1 into a furnace or refining equipment, and fully mix to form a dispersed mixed gas;

[0055] S3. Entering the dispersed mixed gas in step S2 into the aluminum melt and diffusing in the aluminum melt, the alkali metal of the aluminum melt reacts with the oxygen in the dispersed mixed gas to form oxides , floating out of the surface of the aluminum melt.

[0056] A 15-ton smelting furnace with side wall agitation was used to melt A3105 aluminum alloy, and the sample was analyzed. The total content of alkali metal in the melt was detected to be 15ppm by direct-reading spectrometer, and nitrogen with 10% oxygen content was introduced into the side wall agitation refining equipment. Oxygen mixed gas, in which the mixed gas needs to be stirred by a furnace or refining equipment to form a dispersed mixed gas during the feeding process. After continu...

Embodiment 3

[0058] S1. Mix high-purity oxygen and inert gas in proportion to form a mixed gas;

[0059] S2. Pass the mixed gas described in step S1 into a furnace or refining equipment, and fully mix to form a dispersed mixed gas;

[0060] S3. Entering the dispersed mixed gas in step S2 into the aluminum melt and diffusing in the aluminum melt, the alkali metal of the aluminum melt reacts with the oxygen in the dispersed mixed gas to form oxides , floating out of the surface of the aluminum melt.

[0061] Use a 50-ton melting furnace with 10 hearth vent plugs to melt A5052 aluminum alloy, take a sample and analyze it, and use a direct-reading spectrometer to detect that the alkali metal content is 16ppm. Oxygen-nitrogen-oxygen mixed gas, in which the mixed gas needs to be stirred by a furnace or refining equipment to form a dispersed mixed gas during the feeding process. After continuous aeration and refining for 20 minutes, a sample was taken for detection, and the alkali metal content...

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Abstract

The invention relates to a green alkali metal removing method for aluminum and an aluminum melt. The method comprises the following steps: S1, mixing high-purity oxygen and inert gas in proportion to form mixed gas; S2, introducing the mixed gas in the step S1 into a smelting furnace or refining equipment, and fully mixing the same to form dispersed mixed gas; and S3, performing an oxidation reaction on oxygen diffused in the aluminum melt and alkali metal in the aluminum melt and floating to the molten aluminum surface along with bubbles, wherein the removal purpose is achieved. According to the method, high-purity oxygen and inert gas are adopted to form mixed gas, the mixed gas is stirred through refining equipment to form dispersed mixed gas, the dispersed mixed gas is introduced into the aluminum melt, aluminum and alkali metal in the aluminum melt can be directly removed online, and the content of the alkali metal in the aluminum melt is smaller than 5 ppm. Reaction products and aluminum slag are free of fluorine and chlorine and are environmental-friendly, the purification treatment requirement for high-quality aluminum melt in production of high-end aluminum materials is met, and meanwhile, the environmental protection problem existing in the technology for removing alkali metal through fluorine and chlorine adopted by most enterprises at present is solved.

Description

technical field [0001] The invention relates to the technical field of purification treatment of aluminum melts, in particular to a green method for removing alkali metals from aluminum and aluminum melts. Background technique [0002] A large amount of raw materials containing sodium, lithium, and calcium are used in the production of electrolytic aluminum, so that the electrolytic aluminum melt inevitably contains a large amount of alkali metals and alkaline earth metals such as sodium, lithium, and calcium. The content of the above alkali metals or alkaline earth metals is as high as 40 -80ppm, even if the enterprise adopts the conventional production process, the content of alkali metal or alkaline earth metal can still reach more than 20ppm, then the alkali metal elements with a content of more than 20ppm will still remain in the original aluminum ingot and be inherited in the subsequent aluminum processing products . Taking aluminum alloy as an example, if the content...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B21/06C22B9/05
CPCC22B21/064C22B9/05Y02P10/20
Inventor 柯东杰潘伟李宇航柯昱成陈群
Owner FUJIAN METAL NEW ALU TECH
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