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

Method for recycling zinc, indium, iron and gallium from iron vanadium slag

A technology of jarosite slag and alkaline earth metal, applied in the field of metallurgy, can solve the problems of difficult utilization of by-product gypsum, low comprehensive utilization, long process, etc., to improve green ball strength and thermal stability, improve fluidity and desulfurization ability. , The effect of reducing the reduction expansion rate

Active Publication Date: 2017-10-17
CENT SOUTH UNIV
View PDF10 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no recycling of other valuable elements such as iron, gallium, indium, etc.
[0012] To sum up, in the disclosed pyrotechnic patents or patent applications related to the utilization of iron-vanadium slag, they all combine iron-vanadium slag with other smelting slag and reducing agents or desulfurizers for granulation or compaction. , the binders used are quicklime, hydrated lime, cement, bentonite, starch water solubles, glue, syrup, asphalt, etc., without considering the dispersion of the binder and the mixing effect of the mixture, and most of them are raw agglomerates directly entering the high-temperature smelting furnace for reduction, there is no pre-high-temperature roasting desulfurization and consolidation process, it is easy to produce a large amount of powder, resulting in kiln formation
The raw materials are directly put into the reduction furnace for reduction, and the desulfurization effect is poor during the reduction process, which leads to low zinc volatilization rate, and inevitably leads to a serious excess of sulfur content in the reduced iron powder, which cannot meet the technical requirements of high-quality reduced iron powder, and cannot be effectively recycled. Sulfur; the reduced products are obtained through grinding-magnetic separation to obtain reduced iron powder. The quality of reduced iron powder is difficult to guarantee, because in the process of grinding-magnetic separation iron extraction, metallic iron is easy to re-oxidize, and the investment is large and the process is long. High cost; all processes only recycle one or 2-3 valuable elements in the iron slag, and the degree of comprehensive utilization is low, especially the recycling of rare elements indium and gallium is rarely involved
There are only two disclosed technical solutions for desulfurization of sulfur-containing flue gas. One is to use the lime-gypsum method, but the by-product gypsum is difficult to use; the other is to use low-concentration SO 2 The flue gas is returned to the nearby acid plant to produce sulfuric acid, and the flexibility and adaptability of the process are poor

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
  • Method for recycling zinc, indium, iron and gallium from iron vanadium slag
  • Method for recycling zinc, indium, iron and gallium from iron vanadium slag
  • Method for recycling zinc, indium, iron and gallium from iron vanadium slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0136] The dried alum slag has a water content of 7.2%, and the addition of a multifunctional additive with a mass ratio of 2% (the mass ratio is 15% of blue charcoal powder, 40% of limestone powder, 15% of dolomite powder, 10% of sodium humate dry powder, iron oxide powder 10%, sodium carbonate powder 10%), mix in a strong mixer for 1min (1200-1800rpm), mix in a moist mill (moisture water is 6-8%) for 2min, and then mix in a disc pelletizer Make pellets inside, and prepare green pellets with a particle size of 8-16mm and a water content of 9.5%. The drop strength of green balls is 5.1 times / 0.5m, and the compressive strength of green balls is 15.3N / piece.

[0137] Green pellets are dried at 450°C for 3 minutes, preheated at 650°C for 10 minutes, and oxidized and roasted at 1150°C for 80 minutes on a belt roaster (the height of the green pellet layer is 70 mm). The residual sulfur content of the roasted pellets is 1.0%, and the desulfurization rate is It reaches 92.2%, and th...

Embodiment 2

[0143] The dried alum slag contains 8.3% water, and the addition of multifunctional additives with a mass ratio of 5% (the mass ratio is 30% of blue charcoal powder, 40% of limestone powder, 15% of dolomite powder, 5% of sodium humate dry powder, iron oxide powder 5%, sodium carbonate powder 5%), mix in a strong mixer for 1min (1200-1800rpm), mix in a moist mill (moisture water is 6-8%) for 2min, mix well, and then Pelletizing is carried out in the disc pelletizer to prepare green pellets with a particle size of 8-16mm and a water content of 10.5%. The drop strength of green balls is 5.6 times / 0.5m, and the compressive strength of green balls is 16.0N / piece.

[0144] Green pellets were dried at 350°C for 5 minutes, preheated at 850°C for 8 minutes and oxidized and roasted at 1200°C for 60 minutes on a belt roaster (the height of the green pellet layer is 90mm). The residual sulfur content of the roasted pellets was 0.63%, and the desulfurization rate It reaches 96.2%, and the...

Embodiment 3

[0150] The dried alumina slag has a water content of 9.0%, and the alumina slag is added with a mass ratio of 7% multifunctional additives (the mass ratio is 15% of blue charcoal powder, 40% of limestone powder, 15% of dolomite powder, and 10% of sodium humate dry powder , iron oxide powder 10%, sodium carbonate powder 10%), mix in a strong mixer for 1min (1200-1800rpm), mix in a moist mill (moisture water is 6-8%) for 2min, fully mix, Then pelletize in a disc pelletizer to prepare green pellets with a particle size of 8-16 mm and a water content of 12.0%. The drop strength of green balls is 7.3 times / 0.5m, and the compressive strength of green balls is 15.0N / piece.

[0151] Green pellets were dried at 250°C for 6 minutes, preheated at 1100°C for 9 minutes, and oxidized and roasted at 1300°C for 20 minutes on a belt roaster (the height of the green pellet layer was 110mm). The residual sulfur content of the roasted pellets was 0.56%, and the desulfurization rate It reaches 98...

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
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for recycling zinc, indium, iron and gallium from iron vanadium slag. The method specifically comprises the steps of uniform mixing of an additive with the iron vanadium slag, grinding, pelletizing, oxidized roasting desulfurization, direct reduction, melt separation and the like. In the pelletizing process, the special additive is adopted, and the additive comprises an organic binding agent, an alkali earth metal source, an alkali metal source, carbonaceous fuel and ferric oxide. It is verified through a great number of researches and tests that, through the additive, the pellet roasting desulfurization and solidification effects can be enhanced and improved, the roasted pellet strength is improved, the roasted pellet reducibility is improved, the pellet reduction expansion rate is lowered, and a qualified furnace material is provided for pyrogenic-process efficient separation and extraction of multiple types of valuable elements, such as, the iron, gallium, zinc, indium and sulphur.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for efficiently recovering valuable elements such as zinc, indium, iron, gallium, sulfur, etc. from ferrite slag. Background technique [0002] Alumite slag is the waste produced for iron removal in the process of wet zinc extraction, containing 25%-30% iron, 8-12% sulfur, 3%-5% zinc, 50-100g / t silver and a small amount of scattered Metal gallium, indium, germanium and other elements have high utilization value. Because it contains heavy metals and contains 30-50% water, it is relatively unstable and difficult to stockpile. It is a dangerous solid waste, so it must be treated. [0003] The fire extraction process is a promising high-efficiency process. There are many varieties of valuable elements extracted, high extraction efficiency, less waste water, and the secondary slag can be harmless and resource-based. [0004] Reduction roasting-melting is an e...

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 Applications(China)
IPC IPC(8): C22B7/00C22B1/244C22B1/248C22B5/10C22B19/30C22B58/00C25C5/02
CPCC22B1/2406C22B1/244C22B1/248C22B5/10C22B7/001C22B19/30C22B58/00C25C5/02Y02P10/20
Inventor 朱德庆潘建李启厚李紫云梁钟仁
Owner CENT SOUTH UNIV
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