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Molybdenum precipitation wastewater treatment method and molybdenum precipitation residue treatment method

A technology for vanadium precipitation wastewater and its treatment method, which is applied in the field of vanadium precipitation wastewater treatment and vanadium precipitation waste slag treatment. It can solve the problems of poor wastewater treatment effect and complicated process flow, and achieve the benefits of operation and maintenance, offsetting costs, Eliminate the effect of clogging or corroding equipment

Inactive Publication Date: 2019-04-23
JIANGSU NJU ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcomings of the existing vanadium-precipitation wastewater treatment process, which is complex and the wastewater treatment effect is not good. The wastewater treatment method reduces the discharge of harmful substances in the wastewater, realizes the recycling of wastewater, and recovers sodium sulfate as a resource, and realizes the efficient resource recovery and reuse of chromium, vanadium, and ammonium sulfate, and the process flow is simple and effective. lower cost

Method used

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  • Molybdenum precipitation wastewater treatment method and molybdenum precipitation residue treatment method
  • Molybdenum precipitation wastewater treatment method and molybdenum precipitation residue treatment method

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Embodiment 1

[0039] combine figure 1 , a kind of treatment method of vanadium precipitation wastewater of the present embodiment, comprises the following steps:

[0040] Step 1, take a certain amount of vanadium precipitation wastewater, containing 2460mg / L of chromium, 673mg / L of vanadium, Na + 46200mg / L, NH 4 + 7560mg / L, pH 1.73, the vanadium precipitation wastewater is evaporated and concentrated at 60°C through the evaporation equipment, and the condensed water is collected as long as no crystals are precipitated during the evaporation process;

[0041] Step 2, freeze and crystallize the concentrated mother liquor obtained in step 1 to obtain crystallization mother liquor and crystals, refine the crystals to obtain anhydrous sodium sulfate solids, and return the waste liquid generated during the refining process to the raw water and mix with the raw water; this embodiment The medium freeze crystallization adopts the method of two-stage cooling freeze crystallization. The temperature...

Embodiment 2

[0053] The treatment method of a kind of vanadium precipitation waste water of present embodiment, its step is basically the same as embodiment 1, and its difference is: in the present embodiment, vanadium precipitation waste water contains chromium 2430mg / L, vanadium 687mg / L, Na + 46269mg / L, NH 4 + 7560mg / L, pH 1.72, step 1, the vanadium precipitation wastewater is evaporated and concentrated at 100°C through the evaporation equipment, and the evaporation concentration multiple is based on the fact that no crystals are precipitated, and the condensed water is collected;

[0054] Step 2, freeze and crystallize the concentrated mother liquor obtained in step 1 to obtain crystallization mother liquor and crystals, refine the crystals to obtain anhydrous sodium sulfate solids, and return the waste liquid generated during the refining process to the raw water and mix with the raw water; this embodiment The medium freeze crystallization adopts the method of two-stage cooling freez...

Embodiment 3

[0061] Containing 2430mg / L of chromium, 687mg / L of vanadium, Na + 46269mg / L, NH 4 + 7560mg / L, pH 1.72, step 1, the vanadium precipitation wastewater is evaporated and concentrated at 80°C through the evaporation equipment, and the evaporation concentration multiple is based on the fact that no crystals are precipitated, and the condensed water is collected;

[0062] Step 2, freeze and crystallize the concentrated mother liquor obtained in step 1 to obtain crystallization mother liquor and crystals, refine the crystals to obtain anhydrous sodium sulfate solids, and return the waste liquid generated during the refining process to the raw water and mix with the raw water; this embodiment The medium freezing crystallization adopts the method of two-stage cooling and freezing crystallization. The first-stage freezing crystallization temperature is lowered from 80°C to 45°C and kept at 45°C for 1 hour. The second-stage freezing crystallization temperature is lowered from 45°C to 0°...

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Abstract

The invention discloses a molybdenum precipitation wastewater treatment method and a molybdenum precipitation residue treatment method and belongs to the technical field of wastewater treatment. The molybdenum precipitation wastewater treatment method comprises: evaporatively concentrating molybdenum precipitation wastewater by a certain fold, and collecting condensate; subjecting a condensed mother liquor to freezing crystallization to obtain a crystallized mother liquor and crystal, and refining the crystal to obtain solid sodium sulfate; adsorbing the condensate with resin, and removing chromium and vanadium in the condensate; subjecting the resin, which adsorbs the chromium and vanadium, to desorption to obtain a desorbed liquid, mixing the desorbed liquid and the crystallized mother liquor, concentrating the mixture, applying the concentrated mixture to the production front end, and directly discharging the adsorption effluent or applying the desorption effluent to a sodium sulfate refining process. The molybdenum precipitation wastewater treatment method helps reduce the emission of harmful matters in wastewater, allows the wastewater to be recycled with zero emission, and also allows sodium sulfate to be recycled and chromium, vanadium and ammonium sulfate to be recycled.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and more specifically relates to a method for treating vanadium-precipitated wastewater and a method for treating vanadium-precipitated waste residue. Background technique [0002] The wastewater produced in the production process of most vanadium metallurgical industries not only contains chromium and vanadium plasma, but also contains more salt such as sodium sulfate and ammonium sulfate. The composition of wastewater is complex, and it is difficult to treat. Heavy metals such as chromium and vanadium are toxic substances, which will have a great impact on the environment and human health. The salts sodium sulfate and ammonium sulfate contained in wastewater can also cause water pollution. Such waste water must be treated and cannot be discharged directly. In 2011, the country issued the "Vadium Industry Pollutant Discharge Standard" (GB26452-2011), which stipulates the discharge ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/16C22B7/00C22B34/22C22B34/32
CPCC01D5/16C01P2006/82C22B7/005C22B7/006C22B34/22C22B34/32Y02P10/20
Inventor 高亚娟汪林黄如全唐凯朱兆坚翟廷婷邵燕张炜铭
Owner JIANGSU NJU ENVIRONMENTAL TECH
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