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Method for treating wastewater containing ammonia, vanadium, chrome and sodium sulfate

A technology for wastewater treatment and sodium sulfate, which is used in neutralization water/sewage treatment, chemical instruments and methods, heating water/sewage treatment, etc.

Active Publication Date: 2011-02-16
辽宁虹京实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the concentration and chemical properties of various substances in the wastewater, the method adopts step-by-step chemical and physical transformation to solve the technical problems of comprehensive wastewater treatment.

Method used

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  • Method for treating wastewater containing ammonia, vanadium, chrome and sodium sulfate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] 1. Ammonia production process by deamination: Mix the production wastewater containing ammonia, vanadium, chromium and sodium sulfate with 40% sodium hydroxide solution in a pipeline mixer, enter the special deamination tower, and control the temperature at the top of the tower at 100°C Next, the alkali-added waste water flows from the top of the tower to the bottom of the tower through multi-stage tray feeding, and the generated ammonia gas escapes from the outlet of the pipe on the top of the tower, and is cooled by the surface condenser to form ammonia water product with the condensed water vapor. The wastewater discharged at the bottom is deammonization wastewater.

[0013] 2. Extract chromium hydroxide. The deamination wastewater is input into an anti-corrosion reaction kettle with heat preservation, the pH of the wastewater is adjusted to 3 with sulfuric acid, and the temperature is maintained at 65°C with steam. According to Cr 6+ Concentration Add an appropriat...

Embodiment 2

[0017] 1. Deamination to produce ammonia water. Alkali is added to the waste water in the form of 40% sodium hydroxide solution by mass percentage, and the temperature at the top of the tower is controlled at 120°C to obtain ammonia water and deamination waste water. Add sulfuric acid to the deamination wastewater to adjust the pH value to 4, keep it warm at 68°C, and use sodium sulfite as a reducing agent to make Cr 6+ reduced to Cr 3+ Chromium hydroxide is generated, and dechrome wastewater is generated at the same time.

[0018] 2. Extract chromium hydroxide. Trace amounts of vanadium and chromium in dechrome wastewater are adsorbed alternately by gel-type anion exchange resin columns (201×7) for high-valence vanadium and chromium ions in wastewater, and then adsorbed by monoaminophosphoric acid-type chelating resin D412. When 201×7 resin After the column is adsorbed and saturated, it is regenerated with sodium hydroxide alkali solution. After the D412 resin column is sa...

Embodiment 3

[0021] 1. Deamination to produce ammonia water. Mix the production waste water containing ammonia, vanadium, chromium and sodium sulfate with 40% sodium hydroxide solution in a pipeline mixer, enter the deamination tower, and control the temperature at the top of the tower to 109°C.

[0022] 2. Extract chromium hydroxide. The deamination wastewater is input into an anti-corrosion reaction kettle with heat preservation, the pH value of the wastewater is adjusted to 5 with sulfuric acid, the temperature is maintained at 70°C with steam, and formaldehyde is used as a reducing agent to make Cr 6+ reduced to Cr 3+ , when Cr 6+ When the concentration is less than 0.03g / 1, then add sodium hydroxide to adjust the wastewater pH to 8, Cr 3+ Chromium hydroxide is generated, separated by filtration, the solid phase is chromium hydroxide product, and the liquid phase is waste water after chromium precipitation.

[0023] 3. Use resin column to adsorb vanadium and chromium. There is a s...

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Abstract

The invention provides a method for treating wastewater containing ammonia, vanadium, chrome and sodium sulfate. The method comprises the following steps: step 1, deaminating to prepare ammonia; step 2, extracting chromic hydroxide; step 3, absorbing the vanadium and the chrome with resin columns; and step 4, extracting anhydrous sodium sulfate. The method can separate the ammonia, the vanadium, the chrome and the anhydrous sodium sulfate from the wastewater containing the ammonia, the vanadium, the chrome and the sodium sulfate to purify and recycle the wastewater, realize zero emission and generate environmental protection effect, thereby being suitable for extracting usable substances from the wastewater containing the ammonia, the vanadium, the chrome and the sodium sulfate while purifying and recycling the water.

Description

technical field [0001] The invention proposes a method for treating waste water containing ammonia, vanadium, chromium and sodium sulfate with all components in the fields of hydrometallurgy and environmental protection. Background technique [0002] Because the wastewater produced by the hydrometallurgical industry contains ammonia, vanadium, chromium and sodium sulfate at the same time, the chemical composition is complex and the chemical properties are different, so it is difficult to carry out environmental protection treatment. Better companies use reducing agents to treat wastewater, making most of Cr 6+ reduced to Cr 3+ Direct discharge, the ammonia and sodium sulfate in the wastewater are not treated, which will pollute the environment and water bodies as usual, wasting a lot of ammonia, vanadium, chromium, sodium sulfate and water resources. Contents of the invention [0003] In order to overcome the shortcomings of the existing wastewater treatment methods cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C01C1/02C01G37/00C01D5/16C02F1/70C02F1/66C02F1/42C02F1/04C02F101/22C02F101/20C02F101/16
Inventor 陈香友曹宏斌李玉平林晓
Owner 辽宁虹京实业有限公司
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