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Method for efficiently removing nitrogen from secondary aluminum ash and preparing pre-melting type calcium aluminate refining agent

A technology of secondary aluminum and calcium aluminate, applied in the field of solid waste recycling, can solve the problems of difficult disposal of secondary aluminum ash, and achieve the effects of low input cost, strong operability, and reduced energy consumption

Pending Publication Date: 2022-01-11
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Completely solve the problem that the secondary aluminum ash is difficult to dispose of

Method used

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  • Method for efficiently removing nitrogen from secondary aluminum ash and preparing pre-melting type calcium aluminate refining agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]Mix 40.0wt.% secondary aluminum ash, 55.0wt.% quicklime and 5.0wt.% soda ash evenly to obtain a mixture; heat the mixture to 1200°C in air atmosphere and keep it warm for 1.0h to realize the full oxidation of aluminum nitride The mixture is further heated to 1400° C. and then kept for 1.0 h to obtain a calcium aluminate melt; the calcium aluminate melt is poured into a hopper and cooled to obtain a pre-melted calcium aluminate refining agent.

Embodiment 2

[0041] Mix 41.0wt.% of secondary aluminum ash, 53.5wt.% of quicklime and 5.5wt.% of soda ash to obtain a mixture; heat the mixture to 1205°C in an air atmosphere and keep it warm for 1.1h to achieve full oxidation of aluminum nitride The mixture is further heated to 1410° C. and then kept for 1.1 hours to obtain a calcium aluminate melt; the calcium aluminate melt is poured into a hopper and cooled to obtain a pre-melted calcium aluminate refining agent.

Embodiment 3

[0043] Mix 42.0wt.% of secondary aluminum ash, 52.0wt.% of quicklime and 6.0wt.% of soda ash to obtain a mixture; the mixture is heated to 1210°C in an air atmosphere and then kept for 1.2h to achieve full oxidation of aluminum nitride The mixture is further heated to 1420° C. and then kept for 1.2 hours to obtain a calcium aluminate melt; the calcium aluminate melt is poured into a hopper and cooled to obtain a pre-melted calcium aluminate refining agent.

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Abstract

The invention relates to the field of solid waste recycling, and provides a method for efficiently removing nitrogen from secondary aluminum ash and preparing a pre-melting type calcium aluminate refining agent. The method comprises the steps: mixing the secondary aluminum ash with quick lime and sodium carbonate, oxidizing aluminum nitride into aluminum oxide and nitrogen through high-temperature treatment, melting the mixture to obtain a calcium aluminate melt, pouring the melt, and carrying out cooling to obtain the pre-melting type calcium aluminate refining agent. Sodium carbonate is utilized to promote efficient oxidation of aluminum nitride of secondary aluminum ash , so that ammonia pollution caused by hydrolysis of aluminum nitride is avoided; and the pre-melting type calcium aluminate refining agent is prepared from the secondary aluminum ash. The method realizes harmless treatment of the secondary aluminum ash and high-valued utilization of the secondary aluminum ash in the pre-melting type calcium aluminate refining agent, and has the advantages of short process, no pollution and easiness in industrialization.

Description

technical field [0001] The invention relates to the field of solid waste recycling, in particular to a method for secondary aluminum ash high-efficiency nitrogen removal and preparation of a pre-melted calcium aluminate refining agent. Background technique [0002] With the development of the aluminum industry, the amount of secondary aluminum ash increases rapidly. Secondary aluminum ash contains a large amount of alumina (40-60wt.%), aluminum nitride (20-40wt.%), salt refining agent (10-20wt.% of sodium salt, potassium salt and fluoride salt) and a small amount of Metal aluminum, landfill disposal causes aluminum nitride to be easily hydrolyzed to produce ammonia pollution and salt refining agent pollution. Therefore, the problem of secondary aluminum ash disposal needs to be solved urgently. [0003] At present, there are two methods of processing secondary aluminum ash, wet method and fire method. The wet treatment mainly includes the following steps. First, water was...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C21C7/076C21C7/064C01F7/164C22B1/02C22B21/00
CPCC22B7/04C21C7/076C21C7/0645C01F7/164C22B7/001C22B1/02C22B21/0053C22B21/0007Y02P10/20
Inventor 张深根沈汉林刘波张俊杰温泉
Owner UNIV OF SCI & TECH BEIJING
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