Method for separating and recycling vanadium and chromium

A recovery method, the technology of vanadium chromium, applied in the direction of improving process efficiency, etc., can solve problems such as slowness, and achieve the effect of simple process, small amount of chemical input, and few types of chemical agents

Inactive Publication Date: 2014-05-07
孙刚
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adjust the pH to 4.5-10 with alkali, stir slowly for 0.1-12 hours, and then let it settle.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Take 1L vanadium chromium solution, which contains 1020ppm Cr( ) and 205ppm V( ).

[0023] (2) Add 3.4g Na2SO3, adjust pH=2.3 with 1:1 sulfuric acid, stir for 10min; add 3mol / L caustic soda solution to adjust pH to pH=7.5, precipitate and stand still.

[0024] (3) Filter the precipitate; the filtered solution contains very low vanadium and chromium and can be recycled as industrial water; the filter cake is dried in an oven at 50°C for 1 hour.

[0025] (4) Break the dried filter cake to keep the particle size below 2mm.

[0026] (5) Calcinate the crushed filter residue at 900°C for 1.5 hours.

[0027] (6) Stir and dissolve the calcined product with 10% hydrochloric acid, the solid-to-liquid ratio is 1:50, and then filter. 1250ppm of vanadium is dissolved in the liquid phase, while only 10ppm of chromium is dissolved, and most of the chromium remains in the solid phase .

[0028] (7) Add hydrogen peroxide in the amount of complete vanadium oxidant to the filte...

Embodiment 2

[0031] (1) Take 1L vanadium chromium solution, which contains 1500ppm Cr( ) and 202ppm V( ).

[0032] (2) Slowly feed 5L SO2 gas, and use a closed gas collection device to circulate it until it is completely absorbed. Use 1:1 sulfuric acid to adjust pH=2.3, stir for 10min; add 3mol / L caustic soda solution to adjust pH=7.5, precipitate and stand still.

[0033] (3) Filter the precipitate; the filtered solution contains very low vanadium and chromium and can be recycled as industrial water; the filter cake is dried in an oven at 50°C for 1 hour.

[0034] (4) Break the dried filter cake to keep the particle size below 2mm.

[0035] (5) Calcinate the crushed filter residue at 900°C for 1.5 hours.

[0036] (6) Stir and dissolve the calcined product with 10% hydrochloric acid, the solid-to-liquid ratio is 1:30, and then filter. The liquid phase dissolves 1820ppm of vanadium, while only 12ppm of chromium is dissolved, and most of the chromium remains in the solid phase .

[0...

Embodiment 3

[0040] (1) Crushing the vanadium-chromium reduction slag to keep the particle size below 2mm.

[0041] (2) Calcinate the crushed reducing slag at 500°C for 1 hour.

[0042] (3) Use 10% hydrochloric acid to stir and dissolve the calcined product, the solid-to-liquid ratio is 1:30, and then filter. The liquid phase dissolves 1820ppm of vanadium, while only 12ppm of chromium is dissolved, and most of the chromium remains in the solid phase .

[0043] (4) Add sodium percarbonate in the amount of vanadium complete oxidant to the filtered liquid, stir for 30min, then heat to above 90°C for hydrolysis and precipitation of vanadium.

[0044] (5) The filter residue was dried in an oven at 60°C for 1 hour to obtain chromium trioxide.

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PUM

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Abstract

The invention relates to a method for separating and recycling vanadium and chromium in a vanadium and chromium contained solution or vanadium and chromium contained reducing and precipitating slag. The method for separating and recycling vanadium and chromium in a vanadium and chromium contained solution includes the following steps: reducing all vanadium and chromium in the vanadium and chromium contained solution through a certain quantity of a reducing agent, and then performing precipitation after alkali is added; calcining a filter cake at a high temperature for a certain time and cooling after precipitation and filtration; stirring the calcined product in an acid liquor and alkali liquor with a certain concentration or water and dissolving out vanadium and chromium, so as to enable vanadium to be dissolved in the aqueous phase mostly and chromium to be remained in the solid phase as chromic oxide mostly; filtering and separating the solid phase and the aqueous phase, hydrolyzing the filtered solution and precipitating vanadium or precipitating vanadium after ammonium addition, and obtaining the chromic oxide product after heating and drying the solid phase. The method for separating and recycling vanadium and chromium in vanadium and chromium contained reducing and precipitating slag is the same as the treatment manner for the precipitated filter cake in the step of separating and recycling vanadium and chromium in the vanadium and chromium contained solution; the method is simple in procedure and low in cost and enables waste water to be available to cyclic utilization.

Description

technical field [0001] The invention relates to the field of hydrometallurgy or wastewater treatment, in particular to a method for separating and recovering a vanadium-chromium-containing mixed solution or a vanadium-chromium-containing reduction precipitation slag. Background technique [0002] Both vanadium and chromium are important strategic resources. At the same time, both vanadium and chromium are very toxic and pose a serious threat to human and animal health. Vanadium and chromium are adjacent elements on the periodic table with similar properties, and usually exist in a symbiotic manner in In minerals. During mineral processing, waste water or waste residues containing vanadium and chromium are difficult to separate from each other, which not only causes waste of resources, but also seriously pollutes the environment. For the recovery process of vanadium and chromium, US Patent US4344924 uses a quaternary amine extractant to extract from One-step extraction of van...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C22B3/10C22B34/32C22B34/22
CPCY02P10/20
Inventor 孙刚
Owner 孙刚
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