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Method for processing high salinity wastewater containing chromium and vanadium and method for processing precipitated vanadium slag

A technology of high-salt wastewater and treatment method, which is applied in chemical instruments and methods, ammonium sulfate, process efficiency improvement and other directions, can solve the problems of poor wastewater treatment effect and poor adsorption effect, etc. cost, elimination of processing costs, and the effect of increasing economic added value

Inactive Publication Date: 2019-04-19
JIANGSU NJU ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcomings of poor adsorption effect and poor wastewater treatment effect due to high salt content in existing wastewater, and provide a treatment method for chromium-vanadium-containing high-salt wastewater and a treatment method for vanadium-precipitated waste residue. The invented treatment method for high-salt wastewater containing chromium and vanadium reduces the discharge of harmful substances in the wastewater, and can also recover sodium sulfate as a resource to realize the recycling of chromium, vanadium and ammonium sulfate

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  • Method for processing high salinity wastewater containing chromium and vanadium and method for processing precipitated vanadium slag
  • Method for processing high salinity wastewater containing chromium and vanadium and method for processing precipitated vanadium slag

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Embodiment 1

[0039] combine figure 1 , the treatment method of a kind of chromium-vanadium-containing high-salt wastewater of the present embodiment, comprises the following steps:

[0040] Step 1, take a certain amount of high-salt wastewater, containing chromium 2450mg / L, vanadium 668mg / L, Na + 46200mg / L, ammonia nitrogen 7620mg / L, pH 1.73, electrical conductivity 140.6ms / cm, high salt content; the high-salt wastewater containing chromium and vanadium is evaporated and concentrated to a certain multiple by evaporation equipment at 60°C to 100°C, specifically In this example, it is 60°C. During the evaporation process, no crystals are precipitated, and the collected condensed water is used to dilute the crystallization mother liquor after oxidation treatment in subsequent steps;

[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 r...

Embodiment 2

[0053] A kind of treatment method of chromium-vanadium-containing high-salt wastewater of this embodiment, its steps are basically the same as embodiment 1, and its difference is: take a certain amount of high-salt wastewater, containing 2540mg / L of chromium and 675mg / L of vanadium in the wastewater 、Na + 46240mg / L, ammonia nitrogen 7631mg / L, pH 1.71, electrical conductivity 141.2ms / cm, high salt content; the high-salt wastewater containing chromium and vanadium is evaporated and concentrated to a certain multiple at 60℃~100℃ through evaporation equipment, Specifically, in this embodiment, it is 80°C. During the evaporation process, no crystals are precipitated, and the collected condensed water is used to dilute the crystallization mother liquor after oxidation treatment in subsequent steps;

[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 sod...

Embodiment 3

[0063] A treatment method for chromium-vanadium-containing high-salt wastewater of this embodiment, its steps are basically the same as in Example 1, the difference is that a certain amount of high-salt wastewater is taken, and the wastewater contains 2490 mg / L of chromium and 667 mg / L of vanadium 、Na + 46300mg / L, ammonia nitrogen 7650mg / L, pH 1.74, electrical conductivity 146.2ms / cm, high salt content; the high-salt wastewater containing chromium and vanadium is evaporated and concentrated to a certain multiple at 60℃~100℃ through evaporation equipment, Specifically, in this embodiment, it is 100°C. During the evaporation process, no crystals are precipitated, and the collected condensed water is used to dilute the crystallization mother liquor after oxidation treatment in subsequent steps;

[0064] 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 sodi...

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Abstract

The invention discloses a method for processing high salinity wastewater containing chromium and vanadium and a method for processing precipitated vanadium slag, and belongs to the technical field ofwastewater processing. The wastewater processing method comprises following steps: evaporating and concentrating chromium-vanadium containing high salinity wastewater to a certain ratio, collecting the condensing water; freezing and crystallizing the concentrated mother liquor to obtain coarse sodium sulfate, then refining coarse sodium sulfate; preprocessing obtained crystallized mother liquor byan oxidizing agent so that chromium and vanadium exist in the solution in an anion state; mixing the condensing water with oxidized crystallized mother liquor, making the mixed solution go through resin to absorb chromium and vanadium; after desorption, applying the chromium-vanadium containing desorption liquor to production; evaporating and concentrating effluent from the resin to obtain coarseammonium sulfate, refining coarse ammonium sulfate to obtain solid ammonium sulfate; mixing the concentrate with water introduced into the system, and processing the solution in cycle. The provided wastewater processing method can reduce the discharge of harmful substances, sodium sulfate can be recovered, and the chromium, vanadium and ammonium sulfate are recycled.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and more specifically relates to a treatment method for chromium-vanadium-containing high-salt wastewater and a treatment method for 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 stipul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/24C01D5/00C22B7/00C22B34/22C22B34/32
CPCC01C1/24C01D5/00C01P2006/80C22B7/006C22B34/22C22B34/32Y02P10/20
Inventor 汪林黄如全高亚娟邵燕唐凯朱兆坚阮志伟张炜铭
Owner JIANGSU NJU ENVIRONMENTAL TECH
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