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Process and system for processing waste refractory material of aluminum electrolysis cell

Active Publication Date: 2021-04-23
GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solidified and stabilized landfill not only underutilizes resources, but also takes up valuable hazardous waste landfill resources; the traditional pyrotechnic detoxification process is not thorough and cannot fully recover resources; the current wet process detoxification products are difficult to use and resources are difficult to recycle Utilization, waste water with high salt content; fire method volatilization requires large investment, high treatment cost, and immature technology
Current technology is difficult to meet resource recovery and increasingly stringent environmental protection requirements

Method used

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  • Process and system for processing waste refractory material of aluminum electrolysis cell
  • Process and system for processing waste refractory material of aluminum electrolysis cell
  • Process and system for processing waste refractory material of aluminum electrolysis cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A waste refractory treatment system for an aluminum electrolytic cell, the system includes a crushing and grinding module, a smoke collection module, a water immersion filter module, a primary fluoride precipitation module, a secondary fluorine precipitation module, an alkali leaching filter module, a neutralization filter module and a smoke filter module. The gas treatment module, the crushing and grinding module, the water immersion filtration module, the primary fluorine precipitation module, the secondary fluorine precipitation module, the alkali leaching filtration module, and the neutralization filtration module are connected in sequence, and the The crushing and grinding module, the smoke collection module, the water immersion filter module, the primary fluoride precipitation module, the secondary fluoride precipitation module, the alkali leaching filter module, and the neutralization filter module are all related to the The flue gas treatment module is connected....

Embodiment 2

[0069] A treatment system for waste refractories in an aluminum electrolytic cell, the system adopts the treatment system described in Example 1.

[0070] The treatment steps of waste refractory materials in aluminum electrolytic cells are as follows:

[0071] A. Crushing, ball milling, and screening: Crusher 1 is used to crush the waste refractory materials to a particle size of <20mm, and the waste refractory materials are sent to the ball mill 2. The ball milling time is 2 hours. The material with a high content of waste cathode carbon blocks should extend the ball milling time appropriately. The final powder is sent to the vibrating sieve 3, sieved with a 3mm sieve, and the under-sieve that passes the sampling inspection is sent to the water immersion reaction tank 6; the screen residue and the unqualified powder are returned to the ball mill 2 to continue ball milling; the waste refractory material is crushed , milling, and sieving to obtain 200-mesh powder;

[0072] B. ...

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PUM

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Abstract

The invention discloses a process and a system for processing a waste refractory material of an aluminum electrolysis cell, and belongs to the technical field of processing of electrolytic aluminum wastes. The process for processing the waste refractory material of the aluminum electrolysis cell includes the following steps of: mixing waste refractory material powder with water to leach cyanides and soluble fluorides, and carrying out solid-liquid separation to obtain water leaching residues and a water leaching solution; oxidizing the water leaching solution to break cyanide to obtain a cyanide breaking solution; carrying out first-stage fluorine precipitation on the cyanide breaking solution to obtain a calcium fluoride solid and a first-stage fluorine precipitation solution; carrying out second-stage fluorine precipitation in the first-stage fluorine precipitation solution to obtain a second-stage fluorine precipitation solution and crude calcium fluoride; carrying out alkaline leaching detoxification on the water leaching residue to obtain detoxified residues and an alkaline leaching solution; neutralizing the detoxified residues to obtain harmless residues; regenerating the alkaline leaching solution by using lime and recycling the alkaline leaching solution for alkaline leaching detoxification; and collecting and processing the environmental smoke. The process disclosed by the invention realizes harmless disposal of the waste refractory material of the aluminum electrolysis cell, recycles fluorine and sodium alkali resources, avoids harm caused by processing the waste refractory material of the aluminum electrolysis cell to the environment, and achieves resourceful utilization of overhauling residues to a certain extent.

Description

technical field [0001] The invention relates to the technical field of aluminum electrolytic overhaul slag treatment, in particular to a process for treating waste refractory materials in an aluminum electrolytic cell and a system thereof. Background technique [0002] The aluminum electrolytic cell is the main equipment for metal aluminum smelting. Every 5 to 8 years, it needs to be overhauled to remove the lining, and the overhaul slag is produced. About 15-20kg of overhaul slag is discharged per ton of electrolytic aluminum primary aluminum. Aluminum electrolysis overhaul slag is mainly divided into two categories: waste cathode carbon block and waste refractory materials. The main toxic and harmful components are cyanide and soluble fluoride. In 2016, aluminum electrolysis overhaul slag was included in the "National Hazardous Waste List". [0003] The treatment process of aluminum electrolytic overhaul slag includes solidification and stabilization landfill, wet detoxifi...

Claims

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Application Information

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IPC IPC(8): B09B5/00B09B1/00B09B3/00C01F11/22C04B18/04
CPCB09B5/00B09B1/004B09B3/00C01F11/22C04B18/0481Y02W30/91
Inventor 宋海农杜建嘉王爱林宏飞周郁文黎小东邓克信庞荣辉
Owner GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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