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

Process for flue gas desulfurization and carbon sequestration by coupling high-chlorine zinc ash ammonia-ammonium sulfate method efficient zinc extraction with ore pulp method

A high-chloride zinc and flue gas technology, which is applied in the direction of ammonium chloride, zinc compounds, and process efficiency improvement, can solve the problems of secondary pollution in the separation process, difficulty in separation and purification, and complex components of blast furnace gas ash. Low-cost and high-efficiency recovery, and the effect of improving desulfurization efficiency

Pending Publication Date: 2022-05-31
KUNMING UNIV OF SCI & TECH
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] In view of the complex components of blast furnace gas ash, the fluctuation of valuable and harmful elements, the difficulty of separation and purification, and the serious secondary pollution in the separation process, the ash produced after roasting contains a large amount of rare and precious metals such as zinc oxide and In and Ge, and the chlorine content is relatively high. High zinc ash is not only a common hazardous waste in the metallurgical industry, but also a problem of secondary resources with high potential utilization value. High-chlorine zinc ash zinc ammonium complexation flue gas desulfurization coupled with a new idea of ​​separation and recovery of valuable components, using ammonia water to remove chlorine impurities in zinc ash zinc, and preparing zinc ammonia complex solution A new method for effective separation and utilization of valuable components in zinc ash for flue gas desulfurization and decarbonization
The present invention is mainly aimed at the ammonia leaching dechlorination mechanism and efficiency of high-chloride zinc ash, the construction of zinc-ammonia complex solution based on zinc ash and the mechanism of zinc extraction and impurity removal, the mechanism of zinc-ammonia complex flue gas desulfurization and the strengthening approach, and the value of desulfurization mother liquor. Carry out research on four key engineering scientific issues such as the carbonation orientation and utilization of elements

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
  • Process for flue gas desulfurization and carbon sequestration by coupling high-chlorine zinc ash ammonia-ammonium sulfate method efficient zinc extraction with ore pulp method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Firstly, the zinc leaching experiment was carried out, and 150 mL of a mixture of ammonia water, ammonium sulfate and zinc oxide in different proportions was prepared and placed in a beaker; a constant temperature water bath magnetic stirring pot was set, T=25 °C, r=700 r / min; When the temperature of the water bath pot rises to 25°C, start the magnetic stirring for t=60 min, and then vacuum filter to remove the slag to obtain the zinc-ammonia complex solution, as shown in Table 3;

[0046] Table 3 Zinc leaching rate of mixed solutions at different ratios

[0047] serial number (NH 4 ) 2 SO 4 / g

[0048] It can be seen from the data that the third group c(NH 3 ) : c(NH 4 ) 2 SO 4 ) = 4.5:1; c(NH 3 ):c(ZnO)=33:1; c((NH 4 ) 2 SO 4 ) : c(ZnO) = 7.4:1. The leaching rate of zinc oxide in the mixed solution under this condition is more than 95%, which meets the requirement of zinc recovery.

Embodiment 2

[0050] The high-chloride zinc ash to be treated includes the following components: Pb2.75%, Zn54.80%, Fe3.47%, Cl10.92%, Cd0.48%, S1.10%;

[0051] (1) Add industrial ammonia water to the high-chloride zinc ash to be treated at a solid-to-liquid ratio of 1 (g): 3 (ml), and mix thoroughly at room temperature for ammonia leaching dechlorination. The chlorine in the zinc ash is equal to that of ammonium chloride Form is removed, and then solid-liquid separation is carried out to obtain filter residue and filtrate, and the obtained filtrate can be used as a by-product after further treatment; the removal rate of chlorine in high-chloride zinc ash here is 98.9%;

[0052] (2) add ammoniacal liquor and ammonium sulfate solution in step (1) gained filter residue, described ammoniacal liquor is the ammoniacal liquor of 28%, the add-on of described ammoniacal liquor and ammonium sulfate solution is to make ammonia, ammonium sulfate, zinc in the gained mixed liquor The molar concentration...

Embodiment 3

[0056] The high-chloride zinc ash to be treated includes the following components: Pb2.76%, Zn57.00%, Fe2.21%, Cl11.13%, Cd0.26%, S0.62%;

[0057] (1) Add 3% ammonia water to the high-chloride zinc ash to be treated according to the solid-to-liquid ratio of 1 (g): 6 (ml), mix well for ammonia leaching dechlorination, and the chlorine in the zinc ash is in the form of ammonium chloride Removal is carried out, followed by solid-liquid separation to obtain filter residue and filtrate, and the resulting filtrate is used as a by-product after further treatment; the ammonia leaching temperature is 40 °C; the removal rate of chlorine in high-chloride zinc ash here is 98.0%;

[0058] (2) add 20% ammoniacal liquor and ammonium sulfate solution in step (1) gained filter residue, the add-on of described ammoniacal liquor and ammonium sulfate solution is to make the molar concentration ratio of ammonia, ammonium sulfate, zinc in the gained mixed solution be 38: 10:1, the obtained mixed so...

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

The invention discloses a high-chlorine zinc ash ammonia-ammonium sulfate method efficient zinc extraction coupled ore pulp method flue gas desulfurization and carbon sequestration process, which comprises the following steps: (1) adding ammonia water into to-be-treated high-chlorine zinc ash, fully mixing, carrying out ammonia leaching dechlorination, removing chlorine in the zinc ash in the form of ammonium chloride, carrying out solid-liquid separation to obtain filter residues and filtrate, the obtained filtrate can be used as a byproduct after being further treated; (2) reacting ammonia water, ammonium sulfate and zinc oxide (hydrogen) to obtain a zinc-ammonia complexing solution with high desulfurization activity; (3) removing sulfur dioxide in the flue gas by utilizing a zinc-ammonia complex, (hydrogen) zinc oxide and ammonia water in the complexing solution in a synergistic and reinforced manner; and (4) zinc sulfate and ammonia water in the desulfurization mother liquor continue to react with carbon dioxide in the flue gas, decarbonization of the flue gas is achieved, basic zinc carbonate and ammonium sulfate are obtained, and the separated ammonium sulfate can be partially recycled to be used for preparing a zinc-ammonia complexing solution. The invention provides a new application basis for treatment of multiple pollutants in zinc-containing solid waste, sulfur-containing flue gas and carbon-containing waste gas and collaborative emission reduction of greenhouse gas in related industries such as steel and non-ferrous metals.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of industrial solid waste and flue gas desulfurization, and specifically relates to a process for high-efficiency zinc extraction coupled with a slurry method for flue gas desulfurization and carbon fixation by a high-chloride zinc ash ammonia-ammonium sulfate method. Background technique [0002] my country is a big iron and steel country in the world, and the iron and steel industry is also a major producer of industrial solid waste. Based on the production of crude steel and pig iron, 57% to 67% of the solid waste in the world's iron and steel industry is concentrated in China. Blast furnace ironmaking is the leading process that accounts for more than 95% of the world's total iron production. The non-ferrous metal vapor with low boiling point produced in the blast furnace ironmaking process is brought out with the blast furnace gas, and the dust collected by the dust collector is ...

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): B01D53/80B01D53/50B01D53/62B01D53/96C01C1/16C22B19/30C22B19/20C01G9/00
CPCB01D53/80B01D53/502B01D53/62B01D53/96C01C1/164C22B19/30C22B19/24C01G9/00B01D2251/60B01D2251/604B01D2251/608B01D2257/504B01D2258/0283Y02P10/20
Inventor 贾丽娟宁平赵群田森林林琳王东李晨
Owner KUNMING UNIV OF SCI & TECH
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