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Treatment method for cobalt-nickel waste water

A treatment method and wastewater technology, which are applied in water/sewage treatment, water/sewage multi-stage treatment, degassed water/sewage treatment, etc., can solve the problems of difficult treatment of cobalt-nickel wastewater, not easy cobalt oxidation, and long time. To achieve the effect of high oil removal efficiency, accelerated removal and simple process

Active Publication Date: 2016-03-09
RIZHAO HENGTONG WATER TREATMENT EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it takes a long time to ventilate and add a large amount of oxidant, and it is not easy to completely oxidize cobalt (sub)
Therefore, the treatment of cobalt-nickel wastewater has always been a big problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A treatment method for cobalt-nickel wastewater, comprising the following steps:

[0027] (1) Pretreatment, the cobalt-nickel wastewater is passed through an air flotation degreasing device to reduce the oil content in the wastewater to 50ppm, and then filtered to reduce the suspended solids content in the water to below 200ppm;

[0028] (2) Ammonia nitrogen stripping and stripping, adding hydrogen peroxide to the cobalt-nickel wastewater, the content of hydrogen peroxide added to the solution is 1.2g / l, then adding alkali to adjust the pH of the cobalt-nickel wastewater to 10.5, and adding a steam disc in the stripping tower Then, while blowing off, steam is introduced into the coil, and then the pH-adjusted wastewater is added from the top of the stripping tower, and the blower blows air from the bottom of the stripping tower. The residence time of the cobalt-nickel wastewater in the stripping tower is For 60 minutes, the volume ratio of the cobalt-nickel wastewater t...

Embodiment 2

[0041] A treatment method for cobalt-nickel wastewater, comprising the following steps:

[0042] (1) Pretreatment, the cobalt-nickel wastewater is passed through an air flotation degreasing device to reduce the oil content in the wastewater to 50ppm, and then filtered to reduce the suspended solids content in the water to below 200ppm;

[0043] (2) Ammonia-nitrogen stripping and stripping, adding hydrogen peroxide to the cobalt-nickel wastewater, the content of hydrogen peroxide added to the solution is 1.8g / l, then adding alkali to adjust the pH of the cobalt-nickel wastewater to 11, and adding a steam disc in the stripping tower Then, while blowing off, steam is introduced into the coil, and then the pH-adjusted wastewater is added from the top of the stripping tower, and the blower blows air from the bottom of the stripping tower. The residence time of the cobalt-nickel wastewater in the stripping tower is For 60 minutes, the volume ratio of the cobalt-nickel wastewater to ...

Embodiment 3

[0056] A treatment method for cobalt-nickel wastewater, comprising the following steps:

[0057] (1) Pretreatment, the cobalt-nickel wastewater is passed through an air flotation degreasing device to reduce the oil content in the wastewater to 50ppm, and then filtered to reduce the suspended solids content in the water to below 200ppm;

[0058] (2) Ammonia nitrogen stripping and stripping, adding hydrogen peroxide to the cobalt-nickel wastewater, the content of hydrogen peroxide added to the solution is 1.8g / l, and then adding alkali to adjust the pH of the cobalt-nickel wastewater to 10.5, and adding a steam disc in the stripping tower Then, while blowing off, steam is introduced into the coil, and then the pH-adjusted wastewater is added from the top of the stripping tower, and the blower blows air from the bottom of the stripping tower. The residence time of the cobalt-nickel wastewater in the stripping tower is For 70 minutes, the volume ratio of the cobalt-nickel wastewat...

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PUM

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Abstract

The invention relates to a treatment method for cobalt-nickel waste water, and belongs to the field of sewage treatment. The treatment method includes the steps of pretreating, wherein suspended solids and oil of the cobalt-nickel waste water are pretreated; ammonia nitrogen steam stripping and air stripping, wherein treatment is completed through ammonia nitrogen steam stripping and air stripping; deep oil removing through oxidization, wherein the oil is decomposed in an oxidization aeration mode; heavy metal ion precipitating, wherein heavy metal ions are precipitated by adding alkali; deep impurity removing, wherein activated carbon and ion exchange resin are used for deep impurity removing. The treatment method for the cobalt-nickel waste water is simple in process, low in cost and simple in process control, and the treated waste water can be discharged in an up-to-standard mode.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a treatment method for cobalt-nickel wastewater. Background technique [0002] In the hydrometallurgy process of cobalt and nickel, a large amount of waste water and waste residue are often produced, which contain Co, Ni and a small amount of Fe, Cu, Pb, Cr, Mn, etc. For example, the cobalt electrolysis workshop of a smelter discharges 100m3 waste water every day, the cobalt content is as high as 60mg / L, and the annual loss of cobalt is more than 2t. The discharge of this waste water not only causes the loss of precious metal resources, but also causes serious pollution to the environment. Therefore, it is important to treat and comprehensively utilize cobalt-nickel wastewater. [0003] significance. Commonly used separation methods for cobalt and nickel include chemical precipitation, ion exchange, colloidal flotation and solvent extraction. Separation of cobalt a...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/20
CPCC02F1/20C02F1/24C02F1/281C02F1/42C02F1/444C02F1/5236C02F1/76C02F9/00C02F2001/425C02F2101/20
Inventor 向红先
Owner RIZHAO HENGTONG WATER TREATMENT EQUIP
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