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Method for preparing calciferous vanadium oxide from vanadate

A technology of vanadium oxide and vanadate, applied in the direction of improving process efficiency, etc., can solve the problems of fine calcium sulfate crystal particles, environmental pollution caused by ammonia nitrogen boiling water, and difficulty in industrial implementation, and achieve good economic and social benefits, high The effect of vanadium conversion rate and short process

Active Publication Date: 2012-09-19
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the problem that these methods exist is to produce ammonia nitrogen boiling water to pollute the environment, and a large amount of alkali is lost in the vanadium precipitation waste liquid
[0007] Published in "Iron and Steel Vanadium Titanium" 1992 No. 6 document "Extraction of vanadium slag lime roasting method V 2 o 5 "Technology Research" introduces a method of acidifying and leaching calcium vanadate to precipitate vanadium pentoxide with sulfuric acid. The method is to precipitate calcium sulfate at 60 ° C and pH = 2.5 to 2.8, and then heat the supernatant and pH = 1.65 or so for vanadium precipitation, the resulting vanadium precipitation rate can reach 98%, and the solid phase vanadium content is above 85%, but because the calcium sulfate crystal particles generated are fine, it is difficult to filter and industrial implementation is very difficult

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  • Method for preparing calciferous vanadium oxide from vanadate
  • Method for preparing calciferous vanadium oxide from vanadate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The calcium-containing vanadium oxide is prepared by the method of the invention.

[0032] (1) Take 100ml of sodium orthovanadate aqueous solution with an alkali concentration of 103.2g / L, add 10.5g of calcium oxide; under constant stirring, heat to make the reaction temperature reach 80°C, and react for 2h. Filter and wash with water to obtain 18.6g of calcium vanadate precipitate, wherein the vanadium content is 43.65%; the supernatant and the washing liquid are combined, the volume is 495ml, and the vanadium content in the combined solution is 0.11g / L; the vanadium enters the solid phase The conversion rate was 99.55%.

[0033] (2) Take 12.26g of calcium vanadate containing 43.65% vanadium, add water to form a 300ml slurry, add 10 moles / liter of hydrochloric acid in a boiling water bath, and stir at 200r / min to adjust the pH of the solution to 2 for vanadium precipitation . Suction filtration after the reaction, washing the solid with water, combining the supernata...

Embodiment 2

[0035] The calcium-containing vanadium oxide is prepared by the method of the invention.

[0036] (1) Take 100ml of sodium orthovanadate aqueous solution with an alkali concentration of 71.72g / L, add 7g of calcium oxide; under constant stirring, heat to make the reaction temperature reach 90°C, and react for 1.5h. Filter and wash with water to obtain 16.6g of calcium vanadate precipitate, wherein the vanadium content is 42.35%, the supernatant and washing liquid are combined, the volume is 495ml, and the vanadium content in the combined solution is 0.04g / L; vanadium enters the solid phase The conversion rate was 99.63%.

[0037] (2) Take 6.32g of calcium vanadate containing 42.35% vanadium, add water to form a 300ml slurry, add 12 mole / liter of hydrochloric acid at 90°C, and stir at 150r / min to adjust the pH of the solution to 1.5 for vanadium precipitation . Suction filtration after the reaction, washing the solid with water, the supernatant and the washing liquid are combi...

Embodiment 3

[0039] The calcium-containing vanadium oxide is prepared by the method of the invention.

[0040](1) Take 100ml of sodium orthovanadate aqueous solution with an alkali concentration of 93.2g / L, add 7.83g of calcium oxide; under constant stirring, heat to make the reaction temperature reach 95°C, and react for 1h. Filter and wash with water to obtain 17.9 g of calcium vanadate precipitate, wherein the vanadium content is 41.98%, the supernatant and the washing liquid are combined, the volume is 355 ml, and the vanadium concentration in the combined solution is 0.13 g / L; the vanadium enters the solid phase The conversion rate was 99.51%.

[0041] (2) Take 10.20 g of calcium vanadate containing 41.98% vanadium, add water to form a 300 ml slurry, add 8 mole / liter of hydrochloric acid at 95 ° C, and stir at 250 r / min to adjust the pH of the solution to 1.8 for vanadium precipitation . Suction filtration after the reaction, washing the solid with water, the supernatant and the was...

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Abstract

The invention provides a method for preparing calciferous vanadium oxide from vanadate. The method comprises the following steps: (1) adding a calcium source in a soluble vanadic acid saline solution to react to obtain a calcium vanadate precipitate, filtering and washing; (2) adding water in the obtain calcium vanadate from the step (1) to carry out the size mixing, adding hydrochloric acid in the size under the heating condition to regulate the PH value to be 1 to 3, separating out the precipitate and filtering to obtain the calciferous vanadium oxide. The method provided by the invention can get the vanadium oxide which does contain potassium and sodium, can be directly used for producing ferro vanadium, and can achieve the vanadium precipitation rate to be more than 99% and the solid-phase vanadium content (calculated in vanadic oxide) to be about 85%. The whole process flow has the advantages that the operation is simple and convenient and the control and the mastering are easy. The method has no ammonia-nitrogen wastewater drain, reduces the environmental pollution, and has a good application prospect.

Description

technical field [0001] The invention relates to a method for preparing calcium-containing vanadium oxide from vanadate. Background technique [0002] Vanadium is a rare metal widely used in iron and steel, metallurgy, chemical industry and other fields. Vanadium pentoxide (molecular formula V 2 o 5 ) is an indispensable raw material for modern industry. Vanadium metal or vanadium compounds are widely used in high-tech fields such as iron and steel industry, chemical industry, machinery, bridges, aviation and aerospace. In the production process of ferro-vanadium alloy, the most widely used method is to reduce vanadium oxide with aluminum to produce ferro-vanadium. Containing a certain amount of alkali metals (potassium, sodium) in vanadium, the production of vanadium products faces environmental difficulties and economic benefits. [0003] CN 101812588A proposes a method for extracting vanadium and chromium in vanadium slag under normal pressure with potassium hydroxide ...

Claims

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Application Information

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IPC IPC(8): C22B3/46C22B34/22
CPCY02P10/20
Inventor 杜浩郑诗礼张燕王少娜刘彪李兰杰张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI