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Method for separating vanadium and chromium from mixing solution containing vanadium (V) and chromium (VI)

A mixed solution and filtrate technology, applied in the field of separation and recovery of vanadium and chromium in vanadium-chromium mixed solution by precipitation method, can solve the problems of big environmental hidden danger, high cost, complicated process, etc., and achieve good social and economic benefits, equipment and equipment. The effect of low requirements and simple process

Active Publication Date: 2012-04-25
PANGANG GROUP RESEARCH INSTITUTE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, vanadium and chromium are important strategic resources, such treatment will inevitably result in waste of resources, and if the produced vanadium and chromium-containing filter cakes are randomly piled up, there will still be relatively large environmental hazards
[0003] In response to the problems referred to above, the Institute of Process Engineering, Chinese Academy of Sciences has invented a method for extracting and separating vanadium-chromium using primary-secondary amines. And it is difficult to operate precisely, and the energy consumption is high
Chinese patent CN1073414A discloses a method for chemically separating vanadium and chromium in waste water, which uses FeCl 3 The vanadium is precipitated, and then the chromium is recovered by the reduction precipitation method, which is due to the Fe(OH) 3 The presence of impurities such as vanadium and chromium is difficult to obtain high-purity vanadium-chromium products, and the process is relatively complicated and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0036] Adjust the pH to 10.4 with a 200ml mixture of pentavalent vanadium (3.8g / L) and hexavalent chromium (4.6g / L) with sodium hydroxide solution. Stir and meter in anhydrous calcium chloride so that the mass concentration of calcium ions in the solution is 2.2 times the mass concentration of vanadium ions. Then, the pH of the reaction solution was adjusted to 10.4 with sodium hydroxide solution, stirred for 10 minutes and then filtered to obtain a vanadium-containing filter cake and a chromium-containing solution. Next, the vanadium-containing filter cake is soaked in an alkaline solution with a pH of 11 and filtered to obtain the vanadium-containing filter cake again (also can be recorded as the second vanadium-containing filter cake), and the obtained second vanadium-containing filter cake is washed and dried Obtain calcium vanadate. Here, the total vanadium (TV) content of calcium vanadate is 28.31 wt%, and the vanadium yield is 92.15 wt%. The chromium-containing filtrat...

example 2

[0038] Adjust the pH to 10.4 with a 200ml mixture of pentavalent vanadium (4.6g / L) and hexavalent chromium (8.8g / L) with sodium hydroxide solution. Stir and meter in calcium nitrate so that the mass concentration of calcium ions in the solution is 2.8 times that of vanadium ions. Then, the pH of the reaction solution was adjusted to 10.4 with sodium hydroxide solution, stirred for 10 minutes and then filtered to obtain a vanadium-containing filter cake and a chromium-containing solution. Next, the vanadium-containing filter cake is soaked in an alkaline solution with a pH of 11.05 and filtered to obtain a vanadium-containing filter cake (also can be recorded as the second vanadium-containing filter cake), and the obtained second vanadium-containing filter cake is washed and dried Obtain calcium vanadate. Here, the TV of calcium vanadate is 29.92 wt%, and the vanadium yield is 94.74 wt%. The chromium-containing filtrate is reduced and precipitated and then calcined at 1000°C f...

example 3

[0040] Adjust the pH to 10.5 with 200ml of the mixed solution containing pentavalent vanadium (5.6g / L) and hexavalent chromium (10.9g / L) with sodium hydroxide solution. Stir and meter in calcium nitrate so that the mass concentration of calcium ions in the solution is 3.3 times the mass concentration of vanadium ions. Then, continue to adjust the pH of the reaction solution to 10.5 with sodium hydroxide solution, stir for 10 minutes and then filter to obtain a vanadium-containing filter cake and a chromium-containing solution. Next, the vanadium-containing filter cake is soaked in an alkaline solution with a pH of 11.08 and filtered to obtain a vanadium-containing filter cake (also can be recorded as the second vanadium-containing filter cake), and the obtained second vanadium-containing filter cake is washed and dried Obtain calcium vanadate. Here, the TV of calcium vanadate is 30.13 wt%, and the vanadium yield is greater than 95 wt%. The chromium-containing filtrate is redu...

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Abstract

The present invention provides a method for separating vanadium and chromium from a mixing solution containing vanadium (V) and chromium (VI). The method comprises the following steps: adjusting the pH value of the mixing solution to 10.4-10.5; adding a calcium salt to the mixing solution; adjusting the pH value of the resulting mixing solution to 10.4-10.5; filtering the mixing solution to obtain a first vanadium-containing filter cake and a chromium-containing filtrate; soaking the first vanadium-containing filter cake by an alkaline solution with the pH value of 11-11.1, and filtering to obtain a second vanadium-containing filter cake; cleaning the second vanadium-containing filter cake by clear water, and drying to obtain calcium vanadate; treating the chromium-containing filtrate to obtain the chromium product. With the method of the present invention, the vanadium and the chromium can be effectively separated and recovered from the mixing solution containing the vanadium (V) andthe chromium (VI) so as to contribute to the recovery and the utilization of the vanadium resources and the chromium resources. In addition, the method of the present invention has advantages of simpleness and easy operation.

Description

Technical field [0001] The present invention relates to the technical field of recovery and utilization of vanadium (V) and chromium (VI), and more specifically, to a method for separating and recovering vanadium and chromium in a mixed solution containing vanadium (V) and chromium (VI) by a precipitation method. Background technique [0002] At present, in the production of ammonium polyvanadate (APV), a large amount of industrial waste water containing vanadium (V) (that is, pentavalent vanadium) and chromium (VI) (that is, hexavalent chromium) is generated, because these two substances have a lot of Strong toxicity, so high-valent chromium and high-valent vanadium must be reduced to trivalent chromium and low-valent vanadium through reduction treatment, and then the pH can be adjusted to precipitate vanadium and chromium to meet environmental protection requirements. However, vanadium and chromium is an important strategic resource. Such treatment will inevitably result in was...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C22B34/22C22B34/32
CPCY02P10/20
Inventor 尹丹凤余乐何文艺高官金付自碧申彪
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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