Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for magnetically separating and smelting chromium-iron alloy by vanadium extraction from vanadium-chromium slag and reduction of tailings

A technology for ferrochromium alloy and vanadium-chromium slag, which is applied in the fields of vanadium extraction from vanadium-chromium slag and tailing slag reduction magnetic separation to smelt ferrochromium alloy. It can solve the problems of large amount of additives and difficult separation of vanadium and chromium, and achieve high-efficiency separation and harmless Effects of Comprehensive Utilization, Efficient Recycling and Clean Utilization

Active Publication Date: 2015-12-02
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
View PDF11 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above patents can simultaneously extract vanadium and chromium by one-step roasting, but there are problems such as large amount of additives and difficulty in separating vanadium and chromium in the leaching solution.
However, there are no relevant reports on direct roasting of vanadium-chromium slag-acid leaching vanadium extraction-tailing slag reduction-magnetic separation-smelting ferrochromium and slag harmless comprehensive utilization

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 magnetically separating and smelting chromium-iron alloy by vanadium extraction from vanadium-chromium slag and reduction of tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 500g of vanadium-chromium slag was oxidized and roasted at 850°C for 3 hours, and the obtained roasted clinker was ground and leached with a sulfuric acid solution of pH=0.5 at a temperature of 60°C for 60 minutes at a liquid-solid ratio of 4:1, and filtered to obtain a vanadium-containing solution and Filter cake; After the filter cake is washed three times with acid solution, chromium-containing tailings are obtained.

[0052] First, heat the vanadium-containing solution to 95°C, then add ammonium sulfate according to the ammonium addition coefficient of 0.6 and keep stirring, and finally add a small amount of sulfuric acid to adjust the pH value to 1.8, and keep it for 100 minutes to obtain ammonium polyvanadate precipitation and filter, and the filter cake is passed through three times Washing with water, drying at 100°C for 2 hours, and calcining at 550°C for 30 minutes to obtain vanadium pentoxide with a purity of 99%. After testing, the vanadium leaching rate is ...

Embodiment 2

[0056] Oxidize and roast 500g of vanadium-chromium slag at 920°C for 2.5h. The obtained roasted clinker is ground and leached with sulfuric acid solution of pH=1.5 at a temperature of 40°C for 90min at a liquid-solid ratio of 3:1, and filtered to obtain vanadium-containing solution and filter cake; the filter cake is washed three times with acid solution to obtain chromium-containing tailings.

[0057] First heat the vanadium-containing solution to 85°C, then add ammonium sulfate according to the ammonium addition coefficient of 0.6 and keep stirring, and finally add a small amount of sulfuric acid to adjust the pH value to 1.6, and keep it for 120 minutes to obtain ammonium polyvanadate precipitation and filter, and the filter cake is passed through three times Washing with water, drying at 100°C for 2 hours, and calcining at 550°C for 50 minutes to obtain vanadium pentoxide with a purity of 98.5%. After testing, the vanadium leaching rate is 98.6%, the vanadium deposition ra...

Embodiment 3

[0061] Oxidize and roast 500g of vanadium-chromium slag at 900°C for 2 hours, grind the obtained roasted clinker into a sulfuric acid solution with pH=0.5, leaching at a temperature of 50°C for 90min at a liquid-solid ratio of 5:1, and filter to obtain a vanadium-containing solution And the filter cake; the filter cake is washed three times with acid solution to obtain chromium-containing tailings.

[0062] First, heat the vanadium-containing solution to 95°C, then add ammonium sulfate according to the ammonium addition coefficient of 0.8 and keep stirring, and finally add a small amount of sulfuric acid to adjust the pH value to 1.7, and keep it for 90 minutes to obtain ammonium polyvanadate precipitation and filter, and the filter cake is passed through three times Washing with water, drying at 100°C for 2 hours, and calcining at 500°C for 60 minutes to obtain vanadium pentoxide with a purity of 98.5%. After testing, the vanadium leaching rate is 99.1%, the vanadium depositi...

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 method for magnetically separating and smelting chromium-iron alloy by vanadium extraction from vanadium-chromium slag and reduction of tailings. The method includes: directly roasting and acid-leaching the vanadium-chromium slag to extract vanadium, adding an ammonium salt into vanadium-containing solution obtained by acid leaching so as to deposit vanadium, preparing vanadium pentoxide by using a product, using a reducing agent to reduce chromium-containing tailings obtained by acid leaching, performing grinding and screening, subjecting a screened product to low-intensity magnetic separation to obtain iron concentrate, subjecting the iron concentrate to high-intensity magnetic separation to obtain chromium-iron concentrate, returning the chromium-iron concentrate into a blast furnace for smelting, subjecting the chromium-iron concentrate to fusion smelting with a reducing agent and a slag former to obtain chromium-iron alloy and slag, and using the slag to produce cement or building materials. The method enables vanadium leaching yield to be up to 99%, with chromium barely leached (chromium leaching rate being less than 0.5%), and enables efficient separation of vanadium and chromium; the whole-course vanadium recovery rate is higher than 95%, chromium recovery rate is higher than 90%, efficient recycling and clean utilization of the vanadium and chromium are achieved, and harmless comprehensive utilization of the slag is also achieved.

Description

technical field [0001] The embodiments of the present invention relate to the fields of chemical industry and metallurgy, and more specifically, the embodiments of the present invention relate to a method for extracting vanadium from vanadium-chromium slag and smelting ferrochromium by magnetic separation of tailings. Background technique [0002] Vanadium and chromium are important strategic elements, which are widely used in metallurgy and chemical industry. The most important raw material for extracting vanadium is vanadium slag. my country’s Panzhihua Iron and Steel Group and Chenggang Iron and Steel Co., Ltd. use the vanadium slag produced by vanadium-titanium magnetite to extract vanadium. The vanadium output accounts for 80% of the total domestic vanadium products; Chromite ore is obtained by refining, but my country is a chrome-poor country, and 97% of chrome ore depends on imports. It is worth noting that the chromium content in the high-chromium vanadium-titanium m...

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): C22B7/04C22B34/22C22B34/32
CPCY02P10/20
Inventor 李明彭毅杨仰军周玉昌付自碧肖亮高官金
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com