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Method for treating vanadium industrial wastewater through magnesium-process desulfurization waste

A technology of magnesium-based desulfurization and industrial wastewater, applied in chemical instruments and methods, water pollutants, multi-stage treatment of water/sewage, etc., can solve the problem of reducing the pyrolysis temperature of desulfurization products, poor quality of magnesium sulfate, and increasing oxidation equipment, etc. To achieve the effect of realizing resource utilization, solving pollution and land occupation problems, and reducing treatment costs

Active Publication Date: 2016-09-07
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two commonly used treatment methods for the final desulfurization product: one is to directly discharge the saturated slurry by forced oxidation, or crystallize to prepare magnesium sulfate. This method needs to increase oxidation equipment, increase infrastructure costs, and the quality of the prepared magnesium sulfate is not good. Another method is to heat and decompose the desulfurized product after dehydration to obtain magnesium oxide and sulfur dioxide again. The former can be recycled as a desulfurizer, and the latter can produce sulfur or sulfuric acid. agent to reduce the pyrolysis temperature of desulfurization products, and the investment is relatively large

Method used

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  • Method for treating vanadium industrial wastewater through magnesium-process desulfurization waste
  • Method for treating vanadium industrial wastewater through magnesium-process desulfurization waste
  • Method for treating vanadium industrial wastewater through magnesium-process desulfurization waste

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Embodiment 1

[0027] The method that the magnesium method desulfurization waste of present embodiment treats vanadium industrial waste water, as figure 1 shown, follow the steps below:

[0028] (1) Introduce the vanadium industrial wastewater from a factory in Hebei into the reduction reaction tank, stir and add the magnesium desulfurization waste, the amount of the magnesium desulfurization waste added is Cr in the vanadium industrial wastewater 6+ and V 5+ 10 times the total mass, adjust pH=2.0 with sulfuric acid, control ORP270mv, react for 20min, during the reaction process, the high-valence vanadium and chromium in the wastewater are reduced to low-valence states;

[0029] (2) Introduce the reduced waste water into the neutralization sedimentation tank, continue to stir the reduced waste water and adjust the pH=7.0 with sodium hydroxide, react for 10 minutes, add the flocculant polyacrylamide, the amount of flocculant added is 10ppm, and a large amount of alum is formed Flower flocs,...

Embodiment 2

[0033] (1) Introduce the vanadium industrial wastewater from a factory in Heilongjiang into the reduction reaction tank, stir and add the magnesium desulfurization waste, the amount of the magnesium desulfurization waste added is Cr in the vanadium industrial wastewater 6+ and V 5+7 times the total mass, adjust pH=3.0 with hydrochloric acid, control ORP300mv, react for 30min, during the reaction process, the high-valence vanadium and chromium in the wastewater are reduced to low-valence states;

[0034] (2) Introduce the reduced waste water into the neutralization sedimentation tank, continue to stir the reduced waste water and adjust the pH=6.5 with sodium hydroxide, react for 30 minutes, add flocculant polyaluminium chloride, the amount of flocculant added is 50ppm, forming a large amount of Alum flower flocs, continue to stir for 10min, let stand to settle for 3h, and the precipitate obtained is dehydrated by pressure filtration to form a primary chromium hydroxide precipit...

Embodiment 3

[0038] (1) Introduce the vanadium industrial wastewater from a factory in Heilongjiang into the reduction reaction tank, stir and add the magnesium desulfurization waste, the amount of the magnesium desulfurization waste added is Cr in the vanadium industrial wastewater 6+ and V 5+ 5 times the total mass, adjust pH=1.0 with nitric acid, control ORP≥320mv, and react for 10 minutes. During the reaction, the high-valence vanadium and chromium in the wastewater are reduced to low-valence states;

[0039] (2) Introduce the reduced waste water into the neutralization sedimentation tank, continue to stir the reduced waste water and adjust the pH=9.0 with sodium hydroxide, react for 20 minutes, add flocculant polymerized ferric sulfate, the amount of flocculant added is 100ppm, and a large amount of alum is formed For flocs, continue to stir for 5 minutes, and let it settle for 0.5 hours. The obtained precipitate is dehydrated by pressure filtration to form a primary chromium hydroxid...

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Abstract

The invention belongs to the technical field of wastewater and solid waste treatment and particularly relates to a method for treating vanadium industrial wastewater through magnesium-process desulfurization waste, comprising: adding magnesium-process desulfurization waste into vanadium industrial wastewater, reducing high-valence vanadium and chromium in the wastewater into low-valence vanadium and chromium during reacting, continuing to stir the reduced wastewater, adjusting pH with alkali, adding a flocculant, and standing and precipitating to obtain precipitate, and press-filtering and dewatering the precipitate to form primary chromium hydroxide precipitate, charging the obtained filtrate and precipitate into an ammonia nitrogen precipitating tank, adding an easily-soluble magnesium salt into the ammonia nitrogen precipitating tank, continuing to stir and adding a phosphorus source after the easily-soluble magnesium salt dissolves, forming magnesium ammonium phosphate precipitate from ammonia nitrogen during reacting, standing for 20-50 min, press-filtering and dewatering precipitate to obtain slow-release fertilizer material for recycling, and using obtained filtrate and supernate as effluent. The method has good treatment effect, short process, high treatment speed and low cost and may be applied via existing equipment with no additional capital expenditure.

Description

technical field [0001] The invention belongs to the technical field of waste water and solid waste treatment, and in particular relates to a method for treating vanadium industrial waste water with magnesium desulfurization waste. Background technique [0002] Vanadium is known as the metal "vitamin", and is widely used in metallurgy, chemical industry and other industries, as an alloy additive and a catalyst in organic chemical industry. At present, the production process of its main product vanadium pentoxide is mostly sodium roasting process. The main process of this process is: vanadium slag crushing-sodium roasting-water leaching vanadium extraction-leaching solution purification-acid ammonium salt vanadium-melting decomposition, and finally Flake vanadium pentoxide. This process produces a large amount of highly polluted acidic wastewater, which is characterized by high salinity, large discharge, and high content of heavy metals, which is extremely harmful to the en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20C02F101/22
CPCC02F1/52C02F1/66C02F9/00C02F2101/20C02F2101/22
Inventor 薛向欣方得安张学飞
Owner NORTHEASTERN UNIV
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