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Method for preparing sodium metavanadate/potassium metavanadate

A technology of sodium metavanadate and potassium metavanadate, applied in chemical instruments and methods, vanadium compounds, inorganic chemistry, etc., can solve problems such as large acid consumption, low vanadium yield, and difficult control of vanadium deposition process

Inactive Publication Date: 2012-07-04
PANZHIHUA IRON AND STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the pH value needs to be adjusted to 1.1-1.6 in the process of precipitating sodium polyvanadate, the consumption of acid is large, the process of vanadium precipitation is difficult to control and the vanadium yield is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] The method for preparing sodium metavanadate according to the present invention will first be described below.

[0020] According to the method for preparing sodium metavanadate of the present invention, firstly, the sodium vanadium extracting leach solution is heated to 80-90°C, and then according to the mass ratio of Ca:V=1.5:1~2:1, add The calcium chloride saturated solution is fully stirred evenly while maintaining the temperature condition of 80-90° C., reacted for 30-40 minutes, and then filtered to obtain calcium vanadate solid.

[0021] According to the present invention, heating the sodium vanadium-extracting leaching solution to a temperature range of 80-90° C. can prevent the occurrence of solidification during precipitation of calcium vanadate. If the heating temperature is lower than 80° C., solidification will occur during precipitation of calcium vanadate; If the heating temperature exceeds 90°C, although it will not affect the precipitation of calcium va...

Embodiment 1

[0048] Take 1000ml of vanadium-extracting leaching solution (concentration of vanadium is 30.62g / L) and heat it to 90°C, then add saturated calcium chloride solution according to Ca:V mass ratio of 1.5:1 and stir well, react for 40 minutes and filter to obtain vanadium Calcium vanadate solid; After that, the obtained calcium vanadate solid is washed and filtered; then the washed calcium vanadate solid is placed in a container, according to CO 3 2- : Ca 2+ The molar ratio of =1:1 is added with a concentration of 30% sodium bicarbonate solution, fully stirred at 70°C, reacted for 40 minutes and filtered to obtain calcium carbonate solid and sodium metavanadate solution; finally, sodium metavanadate The solution was concentrated to NaVO by evaporation 3 The mass concentration of the sodium metavanadate is 30%, and then the sodium metavanadate solution is cooled to room temperature for crystallization, and after separation and crystallization, it is dried at 35° C. to obtain a s...

Embodiment 2

[0050] Get 1000ml of sodiumized vanadium-extracting leaching solution (vanadium concentration is 20.44g / L) and heat to 80 DEG C, then add calcium chloride saturated solution according to Ca: V mass ratio is 2: 1, then add sedimentation aid, that is, the solid concentration is 100g / L lime slurry, control the pH value of the sodium roasting leachate to be 9, fully stir evenly, filter to obtain calcium vanadate solid after reacting for 40 minutes; then wash and filter the calcium vanadate solid obtained; wash the Calcium vanadate solids are placed in the container, according to the CO 3 2- : Ca 2+ The molar ratio of =1:1 is to add the sodium bicarbonate solution that mass concentration is 20%, fully stir under the condition of 60 ℃, filter after reacting for 40 minutes, obtain calcium carbonate solid and sodium metavanadate solution; Finally, metavanadate Sodium solution is evaporated and concentrated to NaVO 3 The mass concentration of the sodium metavanadate is 30%, and then...

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Abstract

The invention discloses a method for preparing sodium metavanadate / potassium metavanadate, which comprises the following steps: heating sodium modified vanadium extraction leach liquor to 80-90 DEG C, adding calcium chloride saturated solution into the sodium modified vanadium extraction leach liquor with the mass ratio of Ca: V= 1.5: 2, stirring the mixture uniformly while the temperature of 80-90 DEG C is kept, and filtering the mixture after reaction for 30-40 minutes to obtain vanadic acid solid; washing and filtering the obtained vanadic acid solid; putting the washed vanadic acid solid in a container, adding sodium bicarbonate solution or potassium bicarbonate solution with the mass concentration of 20-30% by a molar ratio of CO3<2-> to Ca<2+> in the range of 1 to 1.2 into the container, fully stirring the mixture at temperature of 60-70 DEG C, , filtering the mixture after reaction for 30-40 minutes to obtain calcium carbonate solid and sodium metavanadate or potassium metavanadate solution, evaporating, concentrating, crystallizing, and finally, separating the obtained crystal and dring at a temperature below 40 DEG C to obtain the sodium metavanadate or potassium metavanadate solid.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy. Specifically, the invention relates to a preparation method of sodium metavanadate / potassium metavanadate, in particular to a method for extracting sodium metavanadate / potassium metavanadate from the leach solution of sodium vanadium extraction. The preparation method of potassium vanadate. Background technique [0002] Such as sodium metavanadate (NaVO 3 ) and potassium metavanadate (KVO 3 ) metavanadate is widely used in chemical industry, and can be used as chemical reagent, catalyst, drier, mordant, etc., and sodium metavanadate can be used to manufacture ammonium vanadate, and can also be used in medical imaging, plant inoculation and preventive Potassium metavanadate can be widely used in glazes, chemical catalysts, advanced ceramic products, etc. [0003] At present, for the preparation of sodium metavanadate, the method of extracting sodium metavanadate from vanadium-containing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/00
Inventor 彭一村余晓春邓孝伯李千文刘丰强高官金
Owner PANZHIHUA IRON AND STEEL
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