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A kind of production method of deep vanadium removal in calcium-free roasting process of chromite

A calcium-free roasting, chromite technology, applied in other chemical processes, chemical instruments and methods, vanadium oxide and other directions, can solve problems such as failure, unfavorable preparation of high-purity chromium products, unsuitable for low-concentration vanadium separation and enrichment, etc. achieve the effect of improving quality

Active Publication Date: 2020-10-27
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The treatment method of the solution system is: the existing process is neutralized and acidified to generate Al(OH) 3 , After washing and filtering, aluminum sludge is produced, and the filtrate is Na 2 CrO 4 -NaAlO 2 -NaVO 3 -H 2 O solution system; in order to remove V, add excess calcium compound to precipitate V, but the removal rate of vanadium in this process is basically about 85%, which leads to 80-100mg / L of sodium chromate solution still remaining Vanadium is not conducive to the preparation of high-purity chromium products, and also restricts the performance of chromium salt products
[0006] There are many methods for separating and enriching vanadium from sodium chromate solution, mainly including solvent extraction, ion exchange and precipitation. 6+ Oxidation and failure; the ion exchange method is too cumbersome when used in the vanadium extraction industry. At present, calcium salt precipitation is mostly used to remove vanadium at home and abroad. The amount of calcium oxide added is much greater than the theoretical value, and it is not suitable for the separation of low-concentration vanadium. Therefore, in order to improve the value of chromium salt products, it is an urgent task to realize the production of calcium-free roasting process of chromium salts in China by seeking a new technology for separating low-concentration vanadium in sodium chromate.

Method used

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  • A kind of production method of deep vanadium removal in calcium-free roasting process of chromite
  • A kind of production method of deep vanadium removal in calcium-free roasting process of chromite
  • A kind of production method of deep vanadium removal in calcium-free roasting process of chromite

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Configure NaAlO 2 and sulfuric acid solution to prepare Na for the production system 2 CrO 4 -NaVO 3 -H 2 O low vanadium solution, Na 2 CrO 4 At 100g / L, NaVO 3 At 0.01g / L, the concentration of sulfuric acid solution is at 0.01mol / L (calculated as sulfuric acid);

[0037] (2) to NaAlO 2 Slowly add or add sulfuric acid to the solution for neutralization, gradually form a precipitate, keep the temperature constant at 20°C; stop adding sulfuric acid when the pH value of the reaction solution reaches 12;

[0038] (3) After adding the raw materials, keep the original temperature, pH and stirring speed unchanged, and age for 30 minutes;

[0039] (4) Add the generated γ-AlOOH to Na 2 CrO 4-NaVO 3 -H 2 O solution, adjust the pH of the suspension to 12, and adsorb at a temperature of 20°C for 1 hour; after deep vanadium removal, the vanadium (calculated as V2O5) in the solution is less than 10ppm;

[0040] (5) Adsorption of VO 3 - γ-AlOOH with a small amount of...

Embodiment 2

[0045] (1) Configure NaAlO 2 and sulfuric acid solution to prepare Na for the production system 2 CrO 4 -NaVO 3 -H 2 O solution, Na 2 CrO 4 At 150g / L, NaVO 3 At 0.02g / L, the concentration of sulfuric acid solution is at 0.05mol / L (calculated as sulfuric acid);

[0046] (2) to NaAlO 2 Slowly add or add sulfuric acid to the solution for neutralization, gradually form a precipitate, keep the temperature constant at 30°C; stop adding sulfuric acid when the pH value of the reaction solution reaches 11;

[0047] (3) After adding the raw materials, keep the original temperature, pH and stirring speed unchanged, and age for 60 minutes;

[0048] (4) Add the generated γ-AlOOH to Na 2 CrO 4 -NaVO 3 -H 2 O solution, adjust the pH of the suspension to 11, and adsorb at a temperature of 30°C for 2 hours; 2 o 5 Count) less than 8ppm;

[0049] (5) Adsorption of VO 3 - γ-AlOOH with a small amount of Cr(VI) was washed with water, filtered, and desorbed with a desorption solutio...

Embodiment 3

[0054] (1) Configure NaAlO 2 and sulfuric acid solution to prepare Na for the production system 2 CrO 4 -NaVO 3 -H 2 O solution, Na 2 CrO 4 At 200g / L, NaVO 3 At 0.04g / L, the concentration of sulfuric acid solution is at 0.1mol / L (calculated as sulfuric acid);

[0055] (2) to NaAlO 2 Slowly add or add sulfuric acid to the solution for neutralization, gradually form a precipitate, keep the temperature constant at 60°C; and stop adding sulfuric acid when the pH value of the reaction solution is equal to 10;

[0056] (3) After adding the raw materials, keep the original temperature, pH and stirring speed unchanged, and age for 90 minutes;

[0057] (4) Add the generated γ-AlOOH to Na 2 CrO 4 -NaVO 3 -H 2 O solution, adjust the pH of the suspension to 10, and adsorb at a temperature of 60°C for 3 hours; after deep vanadium removal, the vanadium (calculated as V2O5) in the solution is less than 5ppm;

[0058] (5) Adsorption of VO 3 - γ-AlOOH with a small amount of Cr(V...

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Abstract

The invention discloses a clean production process for deep vanadium removal in a chromite calcium-free roasting process. According to the clean production process, a finished product pseudo-boehmiteor desorbed pseudo-boehmite is directly added to a Na2CrO4-NaVO3-H2O solution system obtained after vanadium removal through neutralization and vanadium removal through calcification to deeply adsorbVO3<->, the gamma-AlOOH product is obtained after the desorption, the desorbed pseudo-boehmite can be recycled as the adsorbent, the V-containing desorption solution is treated with an ion exchange resin, and enrichment is performed to further prepare vanadium pentoxide product. According to the present invention, the residual vanadium in the Na2CrO4-NaVO3-H2O solution system is deeply removed byusing the synthetic pseudo-boehmite, such that the experiment process is simple, the operation is convenient, the new impurities cannot be introduced, the scale production is easily achieved, the vanadium in the sodium chromate solution can be reduced from 80-100 mg / L to 1-10 mg / L (calculated as the V), and the performance of the chromium salt product is further improved.

Description

technical field [0001] The invention relates to deep vanadium removal in the calcium-free roasting process of chromite in the industrial production of chromite, mainly adding directly synthesized or desorbed pseudo-boehmite (γ-AlOOH) to the solution system after neutralization, aluminum removal, calcification and vanadium removal ) to adsorb vanadate (VO 3 - ), a clean production process for desorption and recovery of vanadium (V). Background technique [0002] Chromium salt is one of the main varieties of inorganic salts, and it is widely used in various sectors of the national economy, mainly used in electroplating, leather tanning, printing and dyeing, medicine, pigments, catalysts, oxidants, matches and metal corrosion inhibitors, etc. According to statistics from the commercial sector, chromium compounds are related to 10% of my country's commodity varieties. [0003] Sodium dichromate is the basic product of chromium compounds. There are 14 enterprises in my country...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G31/02C01G37/14B01J20/08
CPCB01J20/08C01G31/02C01G37/14
Inventor 李平张海林郑诗礼张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI