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

Preparation method of ammonium metavanadate

A technology of ammonium metavanadate and ammonium polyvanadate, applied in chemical instruments and methods, vanadium compounds, inorganic chemistry and other directions, can solve the problems of environmental pollution, increase in production cost, and bring in organic and other problems, so as to improve the reaction efficiency and improve the Social and economic benefits

Pending Publication Date: 2022-06-10
承德钒钛新材料有限公司 +1
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing method for preparing metavanadic acid has the following disadvantages: the extraction method is to use an organic extractant to extract the vanadium in the vanadium-containing leaching solution to the organic phase, and after the multi-stage extraction enriches the vanadium in the organic phase to a certain concentration, adding the reverse Extraction agent, vanadium is back-extracted to the water phase, and then combined with ammonium salt to obtain the product; the extraction process route is relatively cumbersome; the selectivity of the organic extractant is not specific, and other impurities are easily brought into the organic phase while extracting vanadium. It makes it difficult for the final product to meet the high-purity requirements; in addition, the volatilization of the extraction agent is inevitable during the production process, which is easy to cause environmental pollution; at the same time, the extraction agent is expensive, and volatilization will inevitably lead to a significant increase in production costs
The redissolution method is to use a large amount of alkali to heat ammonium polyvanadate to above 90°C to completely dissolve it, and then cool the solution to precipitate and crystallize. The crystallization process is long and the vanadium yield is low.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The present embodiment provides a preparation method of ammonium metavanadate, comprising at least the following steps: dissolving ammonium polyvanadate in 60 ℃ of hot water, and the mass ratio of ammonium polyvanadate to water in terms of vanadium pentoxide is 1: 20 (impurity content in ammonium polyvanadate is Al: 0.044%, Cr: 0.051%, Fe: 0.067%, K: 0.166%, Na: 0.271%, Si: 0.025%, Mn: 0.009%, P: 0.009%) , filtered, ammonium polyvanadate solution;

[0028] Ammonia water with a concentration of 5% by mass was added to the ammonium polyvanadate solution to adjust the pH to 8 to 9, cooled to normal temperature at a speed of 8°C / s, and filtered to obtain an intermediate product;

[0029] The intermediate product is put into water, and the mass ratio of the intermediate product to water is 20:70, and the temperature is raised to 60° C. to obtain an intermediate product solution;

[0030] Adjust the pH of the intermediate product solution to 8-10, add ammonium carbonate to c...

Embodiment 2

[0032] The present embodiment provides a preparation method of ammonium metavanadate, comprising at least the following steps: dissolving ammonium polyvanadate in 90 ° C of hot water, and the mass ratio of ammonium polyvanadate to water in terms of vanadium pentoxide is 1: 5 (The impurity content in ammonium polyvanadate is Al: 0.044%, Cr: 0.051%, Fe: 0.067%, K: 0.166%, Na: 0.271%, Si: 0.025%, Mn: 0.009%, P: 0.009%) , filtered, ammonium polyvanadate solution;

[0033] Ammonia water with a concentration of 10% by mass is added to the ammonium polyvanadate solution to adjust the pH to 8 to 9, cooled to normal temperature at a speed of 2 to 8°C / s, and filtered to obtain an intermediate product;

[0034] The intermediate product is put into water, and the mass ratio of the intermediate product to water is 32:70, and the temperature is raised to 20 ° C to obtain an intermediate product solution;

[0035] Adjust the pH of the intermediate product solution to 8-10, add ammonium carb...

Embodiment 3

[0037] The present embodiment provides a preparation method of ammonium metavanadate, comprising at least the following steps: dissolving ammonium polyvanadate in 70 ° C of hot water, and the mass ratio of ammonium polyvanadate to water in terms of vanadium pentoxide is 1: 15 (impurity content in ammonium polyvanadate is Al: 0.044%, Cr: 0.051%, Fe: 0.067%, K: 0.166%, Na: 0.271%, Si: 0.025%, Mn: 0.009%, P: 0.009%) , filtered, ammonium polyvanadate solution;

[0038] Ammonia water with a concentration of 8% by mass was added to the ammonium polyvanadate solution to adjust the pH to 8 to 9, cooled to normal temperature at a speed of 5°C / s, and filtered to obtain an intermediate product;

[0039] The intermediate product is put into water, and the mass ratio of the intermediate product to water is 30:70, and the temperature is raised to 45 ° C to obtain the intermediate product solution;

[0040] Adjust the pH of the intermediate product solution to 8-10, add ammonium carbonate t...

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 relates to the technical field of chemical engineering, in particular to an ammonium metavanadate preparation method which at least comprises the following steps: dissolving ammonium polyvanadate in hot water, and filtering to obtain an ammonium polyvanadate solution; adding alkali into the ammonium polyvanadate solution to adjust the pH value to 8-9, cooling to normal temperature, and filtering to obtain an intermediate product; adding the intermediate product into water, and heating to 20-60 DEG C to obtain an intermediate product solution; adjusting the pH value of the intermediate product solution to 8-10, adding ammonium carbonate until the ammonium carbonate is completely dissolved, adding absolute ethyl alcohol, filtering, washing and drying to obtain the ammonium metavanadate. The preparation method of the ammonium metavanadate is simple, easy to operate, low in equipment requirement, mild in reaction condition, low in cost and easy for large-scale production, overcomes the defects in the prior art, and has relatively high social benefits and economic benefits.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a preparation method of ammonium metavanadate. Background technique [0002] Ammonium metavanadate is a white or slightly yellowish crystalline powder, toxic, slightly soluble in cold water, hot ethanol and ether, soluble in hot water and dilute ammonium hydroxide; mainly used as chemical reagent, catalyst, drier , mordant, etc., widely used in the ceramic industry as glaze, and can also be used to prepare vanadium pentoxide. However, the purity of ammonium metavanadate currently on the market is poor and the quality is uneven. With the wide application of ammonium metavanadate in various industries, people have higher and higher requirements for the purity of ammonium metavanadate. [0003] At present, the methods for preparing metavanadic acid mainly include extraction method, ion replacement method and redissolving method. The existing preparation method of metavan...

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): C01G31/00
CPCC01G31/00C01P2006/80
Inventor 李兰杰徐从美黄荣艳朱立杰马瑞峰杜浩王少娜王新东
Owner 承德钒钛新材料有限公司