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Glass solidification stabilization method for treating aluminum electrolysis waste slot lining based on F-Si chemical bond

A technology of vitrification and waste tank lining, applied in the direction of solid waste removal, etc., can solve the problems of difficult solidification conversion, environmental risks of incineration residues, high fluoride content, etc., and achieve strong stability, easy storage and transfer, and small volume Effect

Inactive Publication Date: 2016-04-20
BEIJING JINGBILAN ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the slow and incomplete reaction of sodium fluoride and lime water in the wet treatment technology, and the potential safety hazards in the operation site due to the precipitation of HCN and other gases, the main method for treating waste tank linings is incineration. Decomposition can be achieved, but the content of fluoride is high, it is difficult to completely realize the solidification transformation at one time, and the incineration residue still has certain environmental risks and hidden dangers

Method used

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  • Glass solidification stabilization method for treating aluminum electrolysis waste slot lining based on F-Si chemical bond

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specific Embodiment approach

[0014] The method for stabilizing vitrification based on F-Si chemical bond treatment of aluminum electrolysis waste tank lining of the present invention, its preferred embodiment is:

[0015] Include steps:

[0016] A. Crushing the waste tank lining into particles with a particle size of less than 15mm;

[0017] B. Put the crushed waste tank lining into a metal curing tank equipped with a thermal induction device, carry out medium-temperature calcination through the heating device, and seal the generated dust in the curing tank, control the temperature at 750-850°C, and keep warm for 2 ~3.5 hours to realize the combustion capacity of carbonaceous components in the waste tank lining and the harmless pyrolysis of cyanide;

[0018] C. After medium-temperature calcination, add glass-like substances 0.8 to 2.0 times the weight of the waste tank lining into the metal curing tank as a curing agent;

[0019] D. Continue calcination, raise the temperature to 1050-1200°C, and keep th...

Embodiment 1

[0031] Firstly, the waste tank lining is broken into particles with a particle size of less than 10mm, weighed 1500g, puts it into a metal curing tank equipped with a thermal induction device, conducts closed heating and calcination by a heating device, and controls the temperature at 830°C for 3 hours. After medium-temperature calcination, add 2,500 g of waste cullet into the curing tank as a curing agent, continue calcination and raise the temperature to 1150° C., keep the temperature for 3.5 hours, and the mixture in the curing tank is in a molten state. Then, under controlled conditions, the molten glassy mixture flows from the metal solidification tank into a receiving container with a certain shape, and after rapid cooling through a quenching procedure, a vitrified solidified body containing waste tank lining fluoride is obtained.

[0032] According to the hazardous waste identification standard and leaching toxicity standard (GB5085.3-2007), the final vitrified solidifie...

Embodiment 2

[0034] First, the waste tank lining is broken into particles with a particle size of less than 5mm, weighed 1000g and placed in a metal curing tank equipped with a thermal induction device, and is closed and heated by a heating device for calcination. The temperature is controlled at 800°C and kept for 2.5 hours. After medium-temperature calcination, add 1,500 g of waste cullet into the curing tank as a curing agent, continue the calcination and raise the temperature to 1100°C, keep the temperature for 3 hours, and the mixture in the curing tank is in a molten state. Then, under controlled conditions, the molten glassy mixture flows from the metal solidification tank into a receiving container with a certain shape, and after rapid cooling through a quenching procedure, a vitrified solidified body containing waste tank lining fluoride is obtained.

[0035] According to the hazardous waste identification standard and leaching toxicity standard (GB5085.3-2007), the final glass sol...

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Abstract

The invention discloses a glass solidification stabilization method for treating an aluminum electrolysis waste slot lining based on an F-Si chemical bond. The glass solidification stabilization method comprises the following steps: crushing the waste slot lining into particles with a particle size smaller than 15mm; putting the crushed waste slot lining into a metal curing tank to carry out medium-temperature roasting, adding glass substances, weight of which is 0.8-2.0 times that of the waste slot lining, as a curing agent to continuously roast after controlling a temperature to 750-850 DEG C and preserving the heat for 2-3.5 hours to carry out the medium-temperature roasting, increasing the temperature to 1050-1200 DEG C and preserving the heat for 2-4 hours; and enabling a molten glass-state mixture to flow into a receiving container, and carrying out annealing / quenching to obtain a glass form containing a waste slot lining fluoride. The finally formed glass-state residues have relatively strong chemical stability and mechanical resistance, are relatively small in size, are easy to store and transfer, can be used as a building material or can be used as common solid waste to carry out landfill treatment or can be used as a coating material for being used for the industries of buildings, roads or heat engines.

Description

technical field [0001] The invention relates to a treatment technology for aluminum electrolysis waste tank lining, in particular to a vitrification stabilization method based on F-Si chemical bond treatment of aluminum electrolysis waste tank lining, including waste cathode carbon, graphite lining, etc. for aluminum electrolysis production All pot linings discarded during the process. Background technique [0002] For every ton of raw aluminum produced, 30kg to 50kg of waste tank linings will be produced. Waste tank linings are included in the national hazardous waste list because they contain a large amount of soluble fluoride, toxic cyanide and other hazardous elements. If they are not disposed of properly, they will not only pollute the atmosphere, but also pollute surface water sources with rainwater entering rivers; landfill The treatment will also pollute the soil at the same time, and the above-mentioned fluoride is very easy to seep into the ground with the rainwat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00
Inventor 桑义敏
Owner BEIJING JINGBILAN ENVIRONMENTAL PROTECTION TECH CO LTD
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