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Method used for processing waste water after vanadium precipitation

A technology for vanadium precipitation wastewater and treatment method, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. Vanadium production process difficulties and other problems, to avoid pollution, avoid equipment fouling and blockage, and improve wastewater treatment capacity

Active Publication Date: 2012-07-04
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such vanadium precipitation wastewater cannot be returned to the system for recycling, nor can it be discharged directly, and must be treated
[0003] There are many methods for the treatment of vanadium-precipitated wastewater, and there are mainly two kinds of thorough treatment methods commonly used: one is to separate the vanadium-chromium residue in the vanadium-precipitated wastewater by reduction with reducing agent and neutralization with lye, and the remaining After the raffinate is frozen and crystallized to separate sodium sulfate, the crystallized raffinate is returned to the vanadium oxide production system for recycling. Although this method realizes the recycling and reuse of vanadium precipitation wastewater, it is difficult to precipitate due to the high solubility of ammonium sulfate. After separation of sodium sulfate, the content of ammonium sulfate in the crystallization raffinate is still very high. Ammonium sulfate will generate ammonia gas during the recycling process, so it is necessary to recycle ammonia gas during the recycling process, which has caused damage to the vanadium oxide production process. difficulty

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This embodiment is used to illustrate the treatment method of the vanadium precipitation wastewater of the present invention.

[0035] To the 100L vanadium precipitation wastewater (V +5 The concentration is 0.015% by weight, Cr +6 Concentration is 0.077 wt%, SO 4 2- Concentration is 6.0% by weight, Na + The concentration is 1.4% by weight, NH 4 +Concentration is 1.0% by weight, pH value is 2.5), add the sodium metabisulfite of 500g, after reacting for 0.2min, then add saturated sodium hydroxide solution and react until no new precipitation material is produced in the vanadium precipitation wastewater, at this time, the reaction The pH of the solution was 8.2. The solid residue and the reaction solution were separated by suction filtration. The reaction solution obtained by separation is added to a distillation tower and heated and concentrated to obtain a concentrated solution with a molar ratio of sodium sulfate and ammonium sulfate of 1:0.89, wherein the total...

Embodiment 2

[0037] This embodiment is used to illustrate the treatment method of the vanadium precipitation wastewater of the present invention.

[0038] To the 100L vanadium precipitation wastewater (V +5 The concentration is 0.008% by weight, Cr +6 Concentration is 0.038 wt%, SO 4 2- Concentration is 5.9% by weight, Na + The concentration is 1.5% by weight, NH 4 + Concentration is 0.98% by weight, pH value is 2.8), add the sodium metabisulfite of 500g, after reacting for 0.2min, then add saturated sodium hydroxide solution and carry out reaction, no longer produce new precipitation substance in the vanadium precipitation wastewater, at this moment, react The pH of the solution was 8.0. The solid residue and the reaction solution were separated by suction filtration. The reaction solution obtained by separation is added to a distillation tower and heated and concentrated to obtain a concentrated solution with a molar ratio of sodium sulfate and ammonium sulfate of 1:0.88, wherein ...

Embodiment 3

[0040] This embodiment is used to illustrate the treatment method of the vanadium precipitation wastewater of the present invention.

[0041] To the 100L vanadium precipitation wastewater (V +5 The concentration is 0.010% by weight, Cr +6 Concentration is 0.043 wt%, SO 4 2- Concentration is 6.7% by weight, Na + The concentration is 1.6% by weight, NH 4 + Concentration is 0.99% by weight, pH value is 2.8), add the sodium metabisulfite of 500g, after reacting for 0.2min, then add saturated sodium hydroxide solution and carry out reaction, no longer produce new precipitated substance in the vanadium precipitation wastewater, at this moment reaction The pH of the solution was 9.0. The solid residue and the reaction solution were separated by suction filtration. The reaction solution obtained by separation is added to a distillation tower and heated and concentrated to obtain a concentrated solution with a molar ratio of sodium sulfate and ammonium sulfate of 1:0.85, wherein...

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Abstract

The invention provides a method used for processing waste water after vanadium precipitation. The processing method leads the waste water after vanadium precipitation to process in a straight line in a whole processing system, the waste water after vanadium precipitation flows unidirectionally in the whole process of putting into a segregation processing, thereby not only being capable of avoiding pollution of the waste water on environment, also being capable of avoiding problems such as equipment scaling blockage, erosion and the like brought by circular process after enrichment of different ions in a crystal residual liquid, and observably improving the waste water treatment ability of a system. The waste water carries out a first crystal and a second crystal after evaporation concentration, is capable of comparing a sodium sulfate constituent and an ammonium sulfate constituent in fully segregation sinking vanadium waste water, and recovers to obtain sodium sulfate crystal and ammonium sulfate crystal with higher purity.

Description

technical field [0001] The invention relates to a treatment method for vanadium precipitation wastewater. Background technique [0002] In the traditional production of vanadium oxide, the process of sodium salt roasting and ammonium salt vanadium precipitation is usually adopted, and the ammonium salt used is mostly ammonium sulfate. A large amount of sodium sulfate, ammonium sulfate and other salts. Such vanadium precipitation wastewater cannot be returned to the system for recycling, nor can it be discharged directly, and must be treated. [0003] There are many methods for the treatment of vanadium-precipitated wastewater, and there are mainly two kinds of thorough treatment methods commonly used: one is to separate the vanadium-chromium residue in the vanadium-precipitated wastewater by reduction with reducing agent and neutralization with lye, and the remaining After the raffinate is frozen and crystallized to separate sodium sulfate, the crystallized raffinate is re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01D5/00C01C1/24
Inventor 蒲德利邓孝伯李千文王彩云王英
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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