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Metallurgical industry high-sulfur wastewater treatment process

A treatment process, high-sulfur technology, applied in the direction of metallurgical wastewater treatment, water/sewage treatment, water/sewage multi-stage treatment, etc. Time, mild reaction conditions, and effect of reducing operating costs

Inactive Publication Date: 2021-09-28
NINGBO DADI CHEM ENG & ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The neutralization method is to use acidic substances to adjust the pH of the waste lye to neutral, so that sodium polysulfide, sodium sulfide and sodium thiosulfate release hydrogen sulfide and sulfur; the neutralization process is simple, but the generated hydrogen sulfide will corrode the equipment , hydrogen sulfide generates sulfur dioxide after combustion, which also pollutes the atmosphere
The air oxidation method mainly uses the oxidation ability of oxygen in the air to oxidize the desulfurization waste caustic soda into salt; this method has the disadvantages of low oxidation efficiency, incomplete oxidation, and long oxidation time.
The chemical oxidation method is a method to oxidize the sulfide in the wastewater to a higher valence state of sulfur oxide by using the oxidizing property of the oxidizing agent. The main oxidizing agents used in the existing process include sodium chlorate, potassium permanganate, hydrogen peroxide, etc. Because desulfurization waste alkali liquor usually has strong alkalinity, it will weaken the oxidizing properties of these oxidizing agents, reduce the oxidation efficiency, increase the usage of oxidizing agents, and increase the production cost.

Method used

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  • Metallurgical industry high-sulfur wastewater treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A treatment process for high-sulfur wastewater in the metallurgical industry, comprising the following steps:

[0036] Step 1, add 50 liters of sulfur wastewater into the adjustment tank, add 2500 liters of water to dilute, and stir evenly;

[0037] Step 2, add 130g sodium phthalocyanine cobalt sulfonate into the adjustment tank, and stir evenly;

[0038] Step 3. Use steam to raise the temperature of the regulating tank to 38°C, and use an air compressor to blow air from the bottom of the regulating tank with an air flow rate of 0.5 m 3 / min, reaction 60min; Filter with plate and frame filter press, obtain solid sulfur and blue transparent solution;

[0039] Step 4: Add the blue transparent solution into the decolorization tank, add 4kg of activated carbon, heat up to 65°C, stir for 60 minutes, and filter to obtain a colorless and transparent solution;

[0040] Step 5: Adjust the colorless and transparent solution to neutrality, send it to the sodium membrane filtrati...

Embodiment 2

[0042] A treatment process for high-sulfur wastewater in the metallurgical industry, comprising the following steps:

[0043] Step 1, add 50 liters of sulfur wastewater into the adjustment tank, add 3000 liters of water to dilute, and stir evenly;

[0044] Step 2, add 160g potassium phthalocyanine cobalt sulfonate into the adjustment tank, and stir evenly;

[0045] Step 3. Use steam to raise the temperature of the regulating tank to 40°C, and use an air compressor to blow air from the bottom of the regulating tank with an air flow rate of 0.7 m 3 / min, reaction 90min; Filter with plate and frame filter press, obtain solid sulfur and blue transparent solution;

[0046] Step 4: Add the blue transparent solution into the decolorization tank, add 4.5kg of activated carbon, heat up to 75°C, stir for 70 minutes, and filter to obtain a colorless and transparent solution;

[0047] Step 5: Adjust the colorless and transparent solution to neutrality, send it to the sodium membrane fil...

Embodiment 3

[0049] A treatment process for high-sulfur wastewater in the metallurgical industry, comprising the following steps:

[0050] Step 1, add 50 liters of sulfur wastewater into the adjustment tank, add 4000 liters of water to dilute, and stir evenly;

[0051] Step 2, add 1000g copper phthalocyanine cobalt sulfonate into the adjustment tank, and stir evenly;

[0052] Step 3. Use steam to raise the temperature of the regulating tank to 45°C, and use an air compressor to blow air from the bottom of the regulating tank with an air flow rate of 1.0 m 3 / min, reaction 120min; Filter with plate and frame filter press, obtain solid sulfur and blue transparent solution;

[0053] Step 4: Add the blue transparent solution into the decolorization tank, add 5kg of activated carbon, heat up to 85°C, stir for 90min, and filter to obtain a colorless transparent solution;

[0054] Step 5: Adjust the colorless and transparent solution to neutrality, send it to the sodium membrane filtration syst...

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Abstract

The invention discloses a metallurgical industry high-sulfur wastewater treatment process which comprises the following steps: introducing high-sulfur wastewater into an adjusting tank, and adding water to dilute the high-sulfur wastewater until the sulfur concentration is 0.01-0.1 g / l after the high-sulfur wastewater is diluted; adding a catalyst cobalt phthalocyanine sulfonate into the adjusting tank, and uniformly stirring; heating the regulating tank to 35-45 DEG C, introducing air into the reaction kettle, fully reacting, and filtering to obtain a blue transparent solution and sulfur; adding activated carbon into the blue transparent solution for decoloration to obtain a colorless transparent solution; and adjusting the colorless transparent solution to be neutral, feeding into a sodium membrane filtration system, discharging the effluent after reaching the standard, and feeding the concentrated mother solution into a concentration salt extraction system. The process has the advantages that the treatment process is simple to operate, the reaction speed is high, and the reaction time is short.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment in the metallurgical industry, in particular to a treatment process for high-sulfur wastewater in the metallurgical industry. Background technique [0002] The metallurgical industry often adopts sodium-alkali method to desulfurize sulfide ore and anode slime. Alkali can chemically react with elemental sulfur to generate sodium sulfide and sodium polysulfide, which are easily soluble in water, so as to achieve the purpose of increasing metal enrichment, but it also produces a large amount of highly polluted and extremely difficult-to-treat high-sulfur wastewater (The sulfur content in the wastewater is greater than 0.2g / L). These high-sulfur wastewaters are alkaline, and if they are discharged directly without treatment, they will seriously pollute the environment. [0003] At present, the methods for treating high-sulfur wastewater in industry mainly include neutralization method, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/16C02F101/10
CPCC02F9/00C02F2103/16C02F2101/101C02F1/725C02F1/283C02F1/44
Inventor 郇昌永吴忠元杜荣景郑奇周颖蒋奇军
Owner NINGBO DADI CHEM ENG & ENVIRONMENTAL PROTECTION