Method for producing low-chromium ammonium polyvanadate

A technology of ammonium polyvanadate and ammonium sulfate, applied in the direction of improving process efficiency, etc., can solve problems such as not being able to meet special requirements, and achieve the effects of low chromium content, reduced consumption, and less dosage

Active Publication Date: 2017-07-04
锦州钒业有限责任公司
View PDF5 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the vanadium solution prepared by roasting vanadium slag with sodium method contains vanadium and chromium (containing 15-35g / L of vanadium and 0.3-2.5g / L of chromium), the properties of vanadium and chromium are similar, and the vanadium solution is more likely to be precipitated by sulfuric acid and ammonium sulfate. During the process of ammonium vanadate, a small amount of chromium will be entrained into ammonium polyvanadate along with the vanadium precipitation reaction. The impurity chromium cannot be removed by water washing. The chromium content of ammonium polyvanadate is usually 0.08-0.40%, which cannot meet the needs of high-end users for low chromium. Special requirements for ammonium polyvanadate (usually chromium ≤ 0.05%)

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 producing low-chromium ammonium polyvanadate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Ammonium polyvanadate (containing chromium 0.08%, K 2 O+Na 2 O is 1.0%) was added in 30g / L sodium carbonate solution, the pH value was adjusted to 8.0, the heating temperature was controlled at 50°C, after ammonium polyvanadate and sodium carbonate reacted completely to form a solution, the volume and mass ratio of solution to polyacrylamide was 1L : 40mg, in solution, add cationic polyacrylamide, stand still clarification 2min, filter, obtain vanadium solution, containing vanadium concentration is 20g / L;

[0024] (2) Add sulfuric acid to the vanadium solution (concentration of vanadium-containing 20g / L) prepared in step (1) to adjust the pH to 1.5. According to the mass ratio of vanadium and ammonium sulfate in the vanadium solution is 1:0.6, add ammonium sulfate After being heated to boiling and reacting to generate ammonium polyvanadate, filter to obtain ammonium polyvanadate solid;

[0025] (3) the ammonium polyvanadate solid prepared by step (2) is washed amm...

Embodiment 2

[0027] (1) Ammonium polyvanadate (containing chromium 0.20%, K 2 O+Na 2 O is 0.63%) is added in 60g / L sodium carbonate solution, adjusts pH value to 9.5, and heating temperature is controlled at 80 ℃, after ammonium polyvanadate and sodium carbonate react completely to generate solution, by solution and polyacrylamide volume mass ratio is 1L: 80mg, add anionic polyacrylamide to the solution, stand still for clarification for 15min, and filter to obtain a vanadium solution with a vanadium-containing concentration of 50g / L;

[0028] (2) Dilute the vanadium solution prepared in step (1) with water to a vanadium-containing concentration of 25g / L, add sulfuric acid to adjust the pH value to 1.0, and add ammonium sulfate according to the mass ratio of vanadium and ammonium sulfate in the vanadium solution to 1:1.0 After being heated to boiling and reacting to generate ammonium polyvanadate, filter to obtain ammonium polyvanadate solid;

[0029] (3) the ammonium polyvanadate solid ...

Embodiment 3

[0031] (1) Ammonium polyvanadate (containing chromium 0.40%, K 2 O+Na 2 O is 0.59%) is added in 50g / L sodium carbonate solution, adjusts pH value to 9.0, and heating temperature is controlled at 65 ℃, after ammonium polyvanadate and sodium carbonate react completely to generate solution, by solution and polyacrylamide volume mass ratio is 1L: 70mg, add cationic polyacrylamide to the solution, stand still for clarification for 10min, filter to obtain a vanadium solution with a vanadium-containing concentration of 30g / L;

[0032] (2) Dilute the vanadium solution prepared in step (1) with water to a vanadium-containing concentration of 25g / L, add sulfuric acid to adjust the pH value to 1.0, and add sulfuric acid according to the mass ratio of vanadium and ammonium sulfate in the vanadium solution to 1:0.9 Ammonium, after heating to boiling and reacting to generate ammonium polyvanadate, filter to obtain ammonium polyvanadate solid;

[0033] (3) the ammonium polyvanadate solid p...

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

According to a method for producing low-chromium ammonium polyvanadate, ammonium polyvanadate produced from vanadium slag with an acidic ammonium salt precipitation method is used as a raw material and is added to a sodium carbonate solution, after a solution is produced through heating and reaction, polyacrylamide is added, the solution is left to stand for clarification, and a vanadium solution is obtained through filtration; the vanadium solution is diluted with water, sulfuric acid is added for adjustment of the pH value, ammonium sulfate is added, after the solution is heated to be boiling and the ammonium polyvanadate reacts, ammonium polyvanadate solids are obtained through filtration and then are washed with a mixed solution of sulfuric acid and ammonium sulfate, the ammonium polyvanadate is rinsed with water, and a low-chromium ammonium polyvanadate product with the chromium mass content being smaller than or equal to 0.03% is obtained. The method has the advantages as follows: the technology is simple, the prepared ammonium polyvanadate has the relatively high purity (V2O5% is larger than or equal to 99.6%), the content of potassium and sodium is low (the sum of the content of K2O and the content of Na2O is smaller than or equal to 0.05%), the chromium content is low, and the defect that ammonium polyvanadate prepared from the vanadium slag used as the raw material has the high chromium content is effectively overcome.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy for extracting vanadium from vanadium slag, and particularly relates to a process for producing low-chromium ammonium polyvanadate in the process of extracting vanadium from vanadium slag. The method can reduce the chromium content in ammonium polyvanadate to 0.03%. the following. Background technique [0002] Low-chromium ammonium polyvanadate is the main raw material for the production of low-chromium flake vanadium pentoxide. It is expensive, has high added value, and has wide application prospects. It is often used to prepare high-end vanadium-aluminum alloys, titanium alloys, and metal vanadium products. [0003] Vanadium-titanium magnetite is the main mineral resource of vanadium. Vanadium-titanium magnetite is smelted into vanadium-containing molten iron by blast furnace, then oxidized and blown by converter. After enrichment, vanadium enters the slag phase to obtain vanadium slag. The vanad...

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): C22B3/44C22B34/22
CPCC22B3/44C22B34/22Y02P10/20
Inventor 刘海田崔传海郭树志赵小钧赵华庄立军杨锦铭李宝玉王向阳马锦红
Owner 锦州钒业有限责任公司
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