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A treatment method for vanadium precipitation wastewater after impurity removal and deamination

A vanadium-precipitated wastewater and ammonia removal technology is applied in natural water treatment, water/sewage multi-stage treatment, heating water/sewage treatment, etc. It can solve the problems of cumbersome treatment methods, difficulty in reusing, and difficulty in reusing wastewater, and achieve The effect of solving the problem of unavailability and reducing the overall processing cost

Active Publication Date: 2019-02-22
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems in the prior art that the treatment method of vanadium precipitation wastewater is cumbersome, the separated product components are complex and uneven and difficult to reuse, and the treated wastewater is difficult to reuse, the purpose of the present invention is to provide a Treatment method of vanadium precipitation wastewater after ammonia

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The content of sodium salt in the vanadium precipitation wastewater after impurity removal and deamination is 90g / L, the content of ammonia salt is 10mg / L, the content of hexavalent chromium salt is 0.03mg / L, and the content of vanadium salt is 1×10 -3 mg / L, 70% of the sodium salt is sodium sulfate, 30% is sodium chloride, the pH of the vanadium precipitation wastewater after removal of impurities and deamination is 8, and the temperature is 100°C.

[0063] The treatment method is as follows: firstly cool the vanadium-precipitated wastewater after impurity removal and deamination to 30°C at a cooling rate of 10°C / min, and keep it warm for 20 minutes; Sodium sulfate hydrate was precipitated in the form of sodium sulfate hydrate, and solid-liquid separation was carried out at 20°C to obtain sodium sulfate decahydrate crystals and primary mother liquor respectively; continue to cool the primary mother liquor to -2°C at a cooling rate of 1°C / min, keep it warm for 20min, and ...

Embodiment 2

[0065] The content of sodium salt in the vanadium precipitation wastewater after impurity removal and deamination is 90g / L, the content of ammonia salt is 20mg / L, the content of hexavalent chromium salt is 0.08mg / L, and the content of vanadium salt is 2×10 -3 mg / L, 80% of the sodium salt is sodium sulfate, 20% is sodium chloride, the pH of the vanadium precipitation wastewater after removal of impurities and deamination is 8.5, and the temperature is 90°C.

[0066] The treatment method is as follows: first cool the vanadium precipitation wastewater after impurity removal and deamination to 30 °C at a cooling rate of 5 °C / min, and keep it warm for 1.2 hours. Precipitate in the form of sodium sulfate decahydrate, and carry out solid-liquid separation at 15°C to obtain sodium sulfate decahydrate crystals and primary mother liquor respectively; continue to cool the primary mother liquor to 0°C at a cooling rate of 3°C / min, keep it warm for 60min, and Solid-liquid separation is car...

Embodiment 3

[0068] The content of sodium salt in the vanadium precipitation wastewater after impurity removal and deamination is 115g / L, the content of ammonia salt is 30mg / L, the content of hexavalent chromium salt is 0.2mg / L, and the content of vanadium salt is 3×10 -3 mg / L, 80% of the sodium salt is sodium sulfate, 20% is sodium chloride, the pH of the vanadium precipitation wastewater after removal of impurities and deamination is 9, and the temperature is 85°C.

[0069] The treatment method is as follows: firstly cool the vanadium-precipitated wastewater after impurity removal and deamination to 30°C at a cooling rate of 8°C / min, and keep it warm for 60 minutes. The form of sodium sulfate hydrate is precipitated, and solid-liquid separation is carried out at 10°C to obtain sodium sulfate decahydrate crystals and primary mother liquor respectively; continue to cool the primary mother liquor to 1°C at a cooling rate of 4°C / min, and keep it warm for 40min. Solid-liquid separation is car...

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Abstract

The invention provides a treatment method for vanadium precipitation wastewater subjected to impurity removal and ammonia deamination. The method comprises the following steps: crystallizing the vanadium precipitation wastewater of which the temperature is 80-100 DEG C after impurity removal and deamination by cooling to 5-30 DEG C at first; separating to obtain sodium sulfate decahydrate crystals and a primary mother solution; crystallizing the primary mother solution by cooling to a range from-2 to 2 DEG C; separating to obtain sodium sulfate heptahydrate crystals and a secondary mother solution; and then crystallizing the secondary mother solution by virtue of vacuum evaporation to obtain a mixed salt of sodium sulfate and sodium chloride, and condensation water. After treatment by the method provided by the invention, the sodium sulfate decahydrate and sodium sulfate heptahydrate crystals of which the purity is more than 98% can be obtained respectively, and the content of sodium chloride in the mixed salt reaches more than or equal to 78%, so that the crystals and the mixed salt can be totally applied to a vanadium extraction and calcination process; however, the content of sodium salts in the condensation water is less than or equal to 500mg / L, so that the condensation water can be applied to a vanadium leaching process, thereby realizing complete recovery utilization of wastewater and zero discharge of wastewater.

Description

technical field [0001] The invention relates to a treatment method for vanadium chemical wastewater, in particular to a treatment method for vanadium-precipitated wastewater after impurity removal and deammonification. Background technique [0002] After removing impurities (vanadium, chromium) and deamination, the industrial wastewater generated in the production process of vanadium products can obtain wastewater containing sodium sulfate, sodium chloride, a small amount of ammonia and a small amount of vanadium. The total content of sodium salt in the wastewater is 90-115g / L, pH = 8-10, and it has a certain temperature caused by the previous process. At present, this kind of waste water mainly adopts the method of evaporative crystallization to obtain mixed salt containing sodium sulfate and sodium chloride. Due to the complex and uneven composition of the product, it is difficult to be further utilized. [0003] CN 102260014 A discloses the process of treating high-conc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C01D5/16C02F103/34
CPCC01D5/16C01P2006/80C02F1/04C02F9/00C02F2103/34
Inventor 李兰杰徐从美陈东辉
Owner HEBEI IRON AND STEEL