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A method for treating vanadium industrial wastewater by using magnesium desulfurization waste

A technology for desulfurization waste and industrial wastewater, applied in chemical instruments and methods, water/sewage multi-stage treatment, neutralized water/sewage treatment, etc., can solve the problem of reducing the pyrolysis temperature of desulfurization products, poor quality of magnesium sulfate, Oxidation equipment and other problems, to solve the problems of pollution and land occupation, simplify the treatment process and treatment time, and reduce the treatment cost.

Active Publication Date: 2019-05-21
NORTHEASTERN UNIV LIAONING
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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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  • A method for treating vanadium industrial wastewater by using magnesium desulfurization waste
  • A method for treating vanadium industrial wastewater by using magnesium desulfurization waste
  • A method for treating vanadium industrial wastewater by using magnesium desulfurization waste

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Embodiment 1

[0025] The method of adopting the magnesium method desulfurization waste of the present embodiment to treat the vanadium industrial wastewater, such as figure 1 shown, follow the steps below:

[0026] (1) The vanadium industrial wastewater from a factory in Hebei was introduced into the reduction reaction pool, and the magnesium desulfurization waste was added to the vanadium industrial wastewater and stirred. The amount of magnesium desulfurization waste added was Cr in the vanadium industrial wastewater. 6+ and V 5+ 10 times the total mass, adjust pH=3.0 with sulfuric acid, control ORP300mv, react for 30 minutes, and reduce high-valence vanadium and chromium to low-valence states during the reaction;

[0027] (2) Introduce the reduced waste water into the sedimentation tank, add easily soluble magnesium salt magnesium chloride to the reduced waste water and continue to stir, the magnesium chloride is 0.5-1.5 times the molar amount of ammonia nitrogen in the reduced waste wa...

Embodiment 2

[0030] The method of adopting the magnesium method desulfurization waste of the present embodiment to treat the vanadium industrial wastewater, such as figure 1 shown, follow the steps below:

[0031] (1) The vanadium industrial wastewater from a factory in Heilongjiang was introduced into the reduction reaction pool, and the magnesium desulfurization waste was added to the vanadium industrial wastewater and stirred. The amount of magnesium desulfurization waste added was equal to Cr in the vanadium industrial wastewater 6+ and V 5+ 8 times the total mass, adjust pH=2.5 with hydrochloric acid, control ORP270mv, react for 10 minutes, and reduce high-valence vanadium and chromium to low-valence states during the reaction;

[0032] (2) Introduce the reduced wastewater into the sedimentation tank, add magnesium sulfate to the reduced wastewater and continue stirring. After the magnesium sulfate is completely dissolved, continue stirring and add phosphoric acid. The amount of phos...

Embodiment 3

[0035] The method of adopting the magnesium method desulfurization waste of the present embodiment to treat the vanadium industrial wastewater, such as figure 1 shown, follow the steps below:

[0036] (1) The vanadium industrial wastewater from a factory in Heilongjiang was introduced into the reduction reaction pool, and the magnesium desulfurization waste was added to the vanadium industrial wastewater and stirred. The amount of magnesium desulfurization waste added was equal to Cr in the vanadium industrial wastewater 6+ and V 5+ 5 times the total mass, adjust pH=1.0 with nitric acid, control ORP350mv, react for 20 minutes, and reduce high-valence vanadium and chromium to low-valence states during the reaction;

[0037] (2) Introduce the reduced wastewater into the sedimentation tank, add magnesium oxide to the reduced wastewater and continue stirring. The amount of magnesium oxide added is 1 times the molar amount of ammonia nitrogen in the reduced wastewater. After the m...

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Abstract

The invention belongs to the technical field of waste water and solid waste treatment, and particularly relates to a method for treating vanadium industrial waste water by magnesium desulfurization wastes. The method comprises the following steps: adding the magnesium desulfurization wastes in the vanadium industrial waste water and stirring; adjusting pH to be equal to 1.0-3.0 with acid; controlling oxidation reduction potential to be greater than or equal to 270 mv, and reacting for 10-30 minutes; reducing high-valence vanadium and chromium into low-valence vanadium and chromium in a reaction process; adding easily soluble magnesium salt in the reduced waste water and continuing stirring; after the easily soluble magnesium salt is dissolved completely, continuing stirring and adding a proper amount of phosphorus sources; adjusting pH to be equal to 9.0-10.0 with alkali; reacting for 10-30 minute so that vanadium, chromium and ammonia nitrogen in the waste water are co-precipitated; standing for 0.5-3.0 hours; dehydrating obtained precipitate by filter pressing; and taking obtained filtrate and supernatant as drained water. The technology is good in treatment effect, the technological process is short, the treatment speed is high, the cost is low, the method can be used in existing equipment, and capital expenditure is not required to be added.

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 Obtained 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...

Claims

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Application Information

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Patent Type & Authority Patents(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 LIAONING
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