A method for secondary aluminum ash reduction of hazardous solid waste heavy metals and slag utilization

A technology of heavy metals and aluminum ash, applied in the field of solid waste recycling, can solve the problems of secondary aluminum ash and hazardous solid waste pollution, achieve low cost, realize harmless disposal and high-value utilization, and solve the problem of heavy metals Effects of Pollution Problems

Active Publication Date: 2022-05-24
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 pollution problem of secondary aluminum ash and hazardous solid waste

Method used

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  • A method for secondary aluminum ash reduction of hazardous solid waste heavy metals and slag utilization
  • A method for secondary aluminum ash reduction of hazardous solid waste heavy metals and slag utilization
  • A method for secondary aluminum ash reduction of hazardous solid waste heavy metals and slag utilization

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Mix 20wt.% of secondary aluminum ash, 20wt.% of hazardous solid waste (all stainless steel slag), 30wt.% of waste glass and 30wt.% of quicklime to obtain a mixture. The mixture is heated to 1200° C. for melting and kept for 3.0 hours, and the heavy metal ions in the stainless steel slag are reduced to liquid metal by using the aluminum nitride in the secondary aluminum ash slag. The liquid metal has a high density and is located at the bottom of the melt; the slag phase has a low density and is located at the upper part of the melt. The liquid metal is casted through the taphole to obtain metal; the slag phase flows out through the slag taphole, and the slag crushed stone is obtained after natural cooling, which is used as a resource for the production of concrete aggregate.

Embodiment 2

[0049] Mix 20wt.% of secondary aluminum ash, 20wt.% of hazardous solid waste (including 15wt.% of stainless steel slag, 5wt.% of pickling sludge), 30wt.% of waste glass and 30wt.% of quicklime to obtain a mixture. The mixture is heated to 1200°C for melting and kept for 2.5 hours, and the heavy metal ions in the stainless steel slag and pickling sludge are reduced to liquid metal by using the aluminum nitride in the secondary aluminum ash slag. The liquid metal has a high density and is located at the bottom of the melt; the slag phase has a low density and is located at the upper part of the melt. The liquid metal is casted through the tap hole to obtain metal; the slag phase flows out through the slag tap, and the high-temperature slag is obtained after heat preservation, which is used as a resource for the production of glass-ceramics.

Embodiment 3

[0051] Mix 20wt.% of secondary aluminum ash, 20wt.% of hazardous solid waste (10wt.% of stainless steel slag, 10wt.% of pickling sludge), 30wt.% of waste glass and 30wt.% of quicklime to obtain a mixture. The mixture is heated to 1200° C. for melting and kept for 2.0 hours, and the heavy metal ions in the stainless steel slag and pickling sludge are reduced to liquid metal by using the aluminum nitride in the secondary aluminum ash slag. The liquid metal has a high density and is located at the bottom of the melt; the slag phase has a low density and is located at the upper part of the melt. The liquid metal is casted through the tap hole to obtain metal; the slag phase flows out through the slag tap, and is water-quenched to obtain water-quenched slag, which is used as a resource for cement production.

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Abstract

The invention relates to the field of solid waste resource utilization, and discloses a method for secondary aluminum ash slag reduction of hazardous solid waste heavy metals and slag utilization. Mix the secondary aluminum ash slag with hazardous solid waste, waste glass and quicklime, use aluminum nitride in the secondary aluminum ash slag as a reducing agent, use the melting method to reduce the hazardous solid waste heavy metal to the metal phase, and use waste glass and quicklime to adjust Reduce the viscosity of slag, realize the enrichment of metal phase and separate from slag; the high value of slag is used in building materials. The invention uses aluminum nitride in the secondary aluminum ash slag as a reducing agent, avoiding the ammonia pollution generated by the hydrolysis of aluminum nitride; reducing heavy metal ions to a metal state, realizing resource utilization and avoiding heavy metal pollution; resource utilization of molten slag in building materials. The invention realizes the co-processing of hazardous solid waste with secondary aluminum ash and slag, realizes high-value utilization of all components of solid waste, and has the advantages of short process, no pollution and easy industrialization.

Description

technical field [0001] The invention relates to the field of solid waste recycling, in particular to a method for secondary aluminum ash slag reduction of hazardous solid waste heavy metals and slag utilization. Background technique [0002] With the development of industry and the improvement of living standards, the amount of secondary aluminum ash slag, stainless steel slag, pickling sludge, lead-zinc smelting slag, copper-nickel water quenching slag and municipal sludge containing heavy metals has increased rapidly. Secondary aluminum ash contains a large amount of alumina (40-60wt.%), aluminum nitride (20-40wt.%), salt refining agent (sodium salt, potassium salt and fluorine salt total 10-20wt.%) and a small amount The metal aluminum, landfill disposal will cause aluminum nitride to be easily hydrolyzed to produce ammonia pollution and salt refining agent pollution. Stainless steel slag, pickling sludge, lead-zinc smelting slag, copper-nickel water quenching slag and m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B09B3/38B09B3/40B09B3/70C22B7/00B09B101/25B09B101/55
CPCB09B3/00B09B5/00C22B7/001B09B3/80Y02P10/20
Inventor 张深根沈汉林刘波
Owner UNIV OF SCI & TECH BEIJING
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