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Harmless treatment method for secondary aluminum ash

A harmless treatment, secondary aluminum technology, applied in chemical instruments and methods, inorganic chemistry, chemical industry and other directions, can solve the problems of high energy consumption, large preparation investment, limited and other problems, achieve high economic benefits, avoid production Safety accidents and low energy consumption

Pending Publication Date: 2021-11-02
邵冰 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of carbon dioxide requires a large investment, and the calcination method is limited by the source of ore. The equipment consumes a lot of energy during calcination, and carbon dioxide is an asphyxiating gas, which will bring safety problems
This process requires the purchase of hydrochloric acid. Hydrochloric acid is a dangerous chemical and must be purchased from a hydrochloric acid manufacturer. The raw materials are limited by the raw material manufacturers, and the requirements for transportation and production management are relatively high.

Method used

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  • Harmless treatment method for secondary aluminum ash
  • Harmless treatment method for secondary aluminum ash
  • Harmless treatment method for secondary aluminum ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The reaction experiment of embodiment 1 secondary aluminum ash and water

[0034] ① In experiment 1, 1 kg of secondary aluminum ash and water were mixed in a ratio of 1:3, placed in a reaction vessel at room temperature of 25°C, and timed. It was found that the hydrolysis reaction proceeded slowly and hardly reacted.

[0035] ②Experiment 2 Mix 1 kg of secondary aluminum ash and water in a ratio of 1:3, place it in a reaction vessel at a water temperature of 50°C, and time it. Small bubbles will be generated after 2 minutes, and large bubbles will be generated after 7 minutes. The temperature of the medium solution was about 85°C, the reaction began to decrease after 9 minutes, and the bubbles were less, and the water was almost evaporated after 2 hours, forming a slurry-like mixture. There was no reaction after adding 1 part of 50°C water.

[0036] ③Experiment 3 Mix 1kg of secondary aluminum ash and water according to the ratio of 1:3, place it in a reaction vessel at ...

Embodiment 2

[0042] Embodiment 2 according to the process step of the present invention harmless treatment secondary aluminum ash:

[0043] (1) Raw material preparation

[0044] Collect primary aluminum ash, after two-stage ball milling and sieving to extract elemental aluminum, the particle size of aluminum ash obtained is about 0.125 μm (the screen is 120 mesh), and the secondary aluminum ash is obtained, the main component of which is: alumina (about 60 %), aluminum nitride (about 17.5%), aluminum (about 6%), fluorine (about 1.6%).

[0045] (2) Hydrolysis

[0046] The secondary aluminum ash is sent to the two-level high-level silo, measured by the metering equipment equipped with the second-level high-level silo, and then sent to the closed hydrolysis tank for hydrolysis through the screw conveyor at the lower part of the silo, and the hydrolysis temperature is controlled at 90°C ~100°C; hydrolysis is stirred with an explosion-proof mixer at the same time, the screw machine and the hy...

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Abstract

A harmless treatment method for secondary aluminum ash comprises the following five process steps: (1) preparing raw materials, namely preparing the secondary aluminum ash; (2) carrying out hydrolysis in a hydrolytic tank; (3) carrying out filter pressing by using a filter press and washing; (4) fixing fluorine by using calcium hydroxide; and (5) washing ammonia gas generated by reaction in a third-stage leaching tower. The method disclosed by the invention has the following advantages: firstly, aiming at the ammonia gas and hydrogen gas generated in a secondary aluminum ash hydrolysis process, a hydrolytic tank sealing form is adopted to prevent air from being mixed in, and a continuous feeding form and a continuous discharging form are adopted, so that explosion accidents of a large amount of ammonia gas and hydrogen gas generated instantly are effectively avoided, and the method is a safe and reliable recovery process; secondly, the whole technological process consumes less equipment, so that the energy consumption is low; the production cost of the method is lower than that of calcination, acid leaching and other processes, the product high-aluminum material, the by-product fluorite calcium fluoride and dilute ammonia water can be comprehensively utilized, and the economic benefit is high. The method is suitable for treating aluminum ash by-products in the electrolytic aluminum industry.

Description

technical field [0001] The present invention relates to aluminum compounds, specifically, to the preparation of aluminum hydroxide with aluminum compounds, and further to the treatment and utilization of secondary aluminum ash. Background technique [0002] Aluminum ash is a by-product of the electrolytic aluminum industry, which is divided into primary aluminum ash and secondary aluminum ash. Primary aluminum ash is the ash that is regularly scraped out during the melting and casting process of aluminum-related industries such as electrolytic aluminum plants and recycled aluminum plants, and the metal aluminum content is 15% to 20%. Enterprises usually use methods such as frying ash or pressing to recover the metal aluminum in aluminum ash. The primary aluminum ash is ground and screened to obtain elemental aluminum, and the fine ash obtained is the secondary aluminum ash. In addition to alumina, secondary aluminum ash also contains toxic and harmful substances such as al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00A62D3/35A62D3/33C01F11/22C01C1/02
CPCB09B3/00B09B5/00A62D3/35A62D3/33C01F11/22C01C1/022C01C1/026Y02P20/50
Inventor 邵冰陈胜佳邵永胜陈明生杨恪言邵思铭
Owner 邵冰
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