Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A device and method for treating hazardous waste from low-zinc-containing steelmaking and producing nano-zinc oxide

A technology of nano-zinc oxide and coarse zinc oxide, which is applied in resource utilization, high-tech treatment of hazardous waste, low-zinc-containing steelmaking hazardous waste treatment and production of nano-zinc oxide, harmless field, can solve hazardous waste, Unrecyclable, poor practicability and other problems, to achieve the effects of reducing production costs, improving production efficiency, and significant novelty

Active Publication Date: 2018-01-09
山西于斯为盛环保科技有限公司
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the Chinese invention patent CN102826589A discloses "a method of producing high-purity nano-zinc oxide using the ammonia method of soot and ash from steel mills", this pure wet process directly uses ammonia leaching to leach solids containing only 5-10% zinc Waste, the leaching rate is extremely low, and the leached slag contains more than 50mg / L of zinc in the leaching solution according to the hazardous waste identification standard, which is still classified as hazardous waste, which cannot achieve the purpose of treatment, and the leached slag contains ammonia and cannot be recycled. A large amount of ammonia is lost, and it cannot really solve the problem of steelmaking zinc-containing dust collection and utilization. It is not practical and it is difficult to really promote it in production.
Using a rotary furnace to treat steelmaking zinc-containing dust collection dust, and because the solid waste raw materials contain a lot of chlorine and carbon, strong carcinogens such as dioxins, polychlorinated biphenyls and their derivatives will be generated in the later stage of the process, if not eliminated It will cause greater secondary pollution to the environment and cause serious harm to the human body.
In general, the existing technology does not comprehensively consider technological issues from the perspectives of environmental governance, energy-saving utilization, and high-tech products. Although resources are being recycled, the utilization efficiency is not high, causing serious secondary pollution, which needs to be improved urgently.

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A device and method for treating hazardous waste from low-zinc-containing steelmaking and producing nano-zinc oxide
  • A device and method for treating hazardous waste from low-zinc-containing steelmaking and producing nano-zinc oxide
  • A device and method for treating hazardous waste from low-zinc-containing steelmaking and producing nano-zinc oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Mix 83 parts of steelmaking dust ash containing 10% zinc (heat content 1000 kcal) and coke 17 parts (calorific value 8000 kcal). After mixing the ingredients, add binder for granulation. Binders are water, cement and slaked lime, of which 100 parts of zinc-containing dust collection ash and coke mixture, 5 parts of water, 3 parts of slaked lime, 2 parts of cement, the total number of parts is 110 parts; Granulation, the speed of the granulator is controlled at 500 revolutions per minute, and the particle size is 0.5-3mm. After granulation, it is put into the rotary furnace for reduction and oxidation; The zinc content in the leached leaching solution is less than 50mg / L, which is harmless and can be returned to the steelmaking plant as a sintering material for continued use as a refined iron ore; the high-temperature and high-dust kiln gas is fed into the waste heat boiler to produce steam for the wet process section; The dust-laden gas out of the boiler enters the firs...

Embodiment 2

[0036] Mix 95 parts of steelmaking dust ash containing 5% zinc (heat content 1000 kcal) and 5 parts anthracite (calorific value 6000 kcal) and mix the ingredients. After mixing the ingredients, add a binder for granulation. The binder is slaked lime and sodium silicate with 90% water content; the mixture of zinc-containing dust ash and anthracite is 100 parts, 5 parts of sodium silicate with 90% water content, and 3 parts of slaked lime, the total number of parts is 108 parts Enter the granulation of the stirring tooth granulator, the granulator speed is controlled at 300 revolutions per minute, and the particle size is 0.5-3mm. After granulation, enter the rotary furnace for reduction and oxidation, and the weight percentage of zinc in the slag that the rotary furnace tail goes out is less than 0.5%, according to the hazardous waste identification standard, the zinc content in the leaching solution is less than 50mg / L, which is harmless. It will be returned to the steelmaking ...

Embodiment 3

[0039] Mix 88 parts of steelmaking dust collection dust containing 8% zinc (1000 kcal of heat) and 12 parts of coke (8000 kcal of calorific value). The binder is water and cement, in which 100 parts of steelmaking dust collection ash and anthracite mixture, 4 parts of water, 1 part of cement, the total number of parts is 105 parts; it is fed into the agitator granulator for granulation, and the granulator The speed is controlled at 800 revolutions per minute, the particle size is 0.5-3mm, and it is put into the rotary furnace for reduction and oxidation. The weight percentage of zinc in the slag from the tail of the rotary furnace is less than 0.5%. The content is less than 50mg / L, which is harmless. It will be returned to the steelmaking plant as a sintering material for continued use as a concentrate of iron ore; the high-temperature kiln gas enters the waste heat boiler, and the steam produced enters the wet process section; the high-dust tail gas enters the cyclone separato...

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

PropertyMeasurementUnit
specific surface areaaaaaaaaaaa
specific surface areaaaaaaaaaaa
specific surface areaaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method and device for treating low-zinc-content steelmaking dangerous waste and producing nano-zinc oxide and belongs to the technical field of environment protecting and energy saving. For low-zinc-content steelmaking collected dust, the technology integrated innovation is conducted on the technical basis of a traditional rotary furnace pyrogenic process and a wet process, a fire-wet combined integrated organic technology integral for treating dangerous waste, utilizing waste heat and producing the nano-zinc oxide is formed, and the brand new technology breakthrough is achieved.

Description

technical field [0001] The invention relates to a harmless, resourceful and high-tech method and device for treating hazardous waste, in particular to a device and method for treating hazardous waste from low-zinc-containing steelmaking and producing nano-zinc oxide, which belongs to environmental protection, energy saving and nano The field of material production technology. Background technique [0002] China is the largest steel producing country in the world, and the leaching hazardous solid waste—zinc-containing dust ash produced in the steel production process reaches several million tons every year. In the past, landfills were often used for disposal, resulting in the slow leaching and infiltration of heavy metal elements such as zinc, lead, cadmium, and chromium contained in dust collection ash under the action of acid rain, seriously polluting surface water and groundwater. At present, the treatment and utilization technology of this kind of hazardous waste is not ...

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
Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B1/243C22B19/34B01D53/04
CPCB01D53/04B01D2257/708C22B1/243C22B7/001C22B7/007C22B7/008C22B7/02C22B19/34C22B19/38
Inventor 周少雄骆天荣常成明贾彬杨克勤戴文杰
Owner 山西于斯为盛环保科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com