Harmless treating method for waste tank lining of aluminium electrolytic bath

A harmless treatment, aluminum electrolytic cell technology, applied to the removal of solid waste, etc., can solve the problems of waste tank lining pollution, etc., to achieve the effect of cheap price, easy industrialization, and wide source

Active Publication Date: 2005-02-23
中铝郑州有色金属研究院有限公司
View PDF0 Cites 46 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the deficiencies of the above prior art in the treatment of waste linings of aluminum electrolytic cells, and provides a waste aluminum electrolytic cell

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] Example 1

[0020] Heat treatment raw materials are mixed with waste tank lining 970 grams, added in the form of particles smaller than 2mm; mixed with 1358 grams of limestone (1.4 times the waste tank lining), added in the form of particles smaller than 2mm; the amount of fly ash mixed is 242.5 grams (0.25 times of the waste tank lining), added in the form of particles less than 1mm, mix the three materials evenly, and add the feeder to the rotary kiln. The bituminous coal is sprayed into the rotary kiln in the form of pulverized coal; the treatment temperature is controlled at 700°C, the treated material is rinsed with 10% lime water, and the flue gas is adsorbed by alumina. The soluble fluorine content in the final solid slag was 41.52mg / l, the cyanide content was 0.037mg / l, and the content of harmful substances in the solid slag and flue gas was lower than the national environmental protection allowable emission standard.

Example Embodiment

[0021] Example 2

[0022] Heat treatment raw materials are mixed with waste tank lining 1210 grams, added in the form of particles less than 2mm; mixed with 1089 grams of limestone (0.9 times the waste tank lining), added in the form of particles less than 2mm; fly ash added in the form of 484 grams (0.4 times of the waste tank lining), added in the form of particles less than 1mm, mix the three materials uniformly, and add the feeder to the rotary kiln. The bituminous coal is sprayed into the rotary kiln in the form of pulverized coal; the treatment temperature is controlled at 900°C, the treated material is rinsed with 15% lime water, and the flue gas is adsorbed by alumina. The final soluble fluorine content in the solid slag was 23.71mg / l, the cyanide content was 0.029mg / l, and the content of harmful substances in the solid slag and flue gas was lower than the national environmental protection allowable emission standard.

Example Embodiment

[0023] Example 3

[0024] 675 grams of waste tank lining is added to the heat treatment raw materials in the form of particles less than 2mm; 742.5 grams of limestone (1.1 times the waste tank lining) is added in the form of particles less than 2mm; the amount of sand is 135 grams (waste 0.2 times of the tank lining), added in the form of particles less than 1mm, mix the three materials evenly, and add the feeder to the rotary kiln. The bituminous coal is sprayed into the rotary kiln in the form of pulverized coal; the heat treatment temperature is controlled at 850℃, the material after heat treatment is rinsed with 20% lime water, and the flue gas is adsorbed by alumina. The final soluble fluorine content in the solid slag was 29.22mg / l, the cyanide content was 0.052mg / l, and the content of harmful substances in the solid slag and flue gas was lower than the national environmental protection allowable emission standard.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

A process for innocuously treating the used liner of aluminium electrolyzer includes such steps as proportionaly mixing it with the calcium oxide contained ore, SiO2 contained material and bitumite, heat treating in rotary kiln, adsorbing tail gas by alumina, and leaching the treated material by lime milk for secondary reaction. It can greatly decrease the contents of fluoride and cyanide in the treated dregs, which can be used to prepare cement or refractory or for building road.

Description

technical field [0001] A harmless treatment method for waste linings of aluminum electrolytic cells, which relates to waste linings of electrolytic cells in the process of electrolytic production of metal aluminum, especially all waste linings including waste cathode carbon blocks and waste refractory materials Harmless disposal method. Background technique [0002] The waste tank lining produced in the production process of electrolytic aluminum contains a large amount of soluble fluoride and cyanide, which is directly stacked in the open air and pollutes the atmosphere, and is mixed with rainwater into rivers to pollute surface water sources; landfill treatment also pollutes the soil, and infiltrates into underground pollution with rainwater Groundwater seriously endangers human health and causes great harm to the growth of animals and plants. The pollution of waste tank linings has become one of the important issues affecting the comprehensive, coordinated and sustainabl...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): B09B3/00C25C3/08
Inventor 李旺兴陈喜平刘凤琴罗钟生赵淋
Owner 中铝郑州有色金属研究院有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap