Method for treating magnesium extraction raffinate wastewater

Abstract

The invention discloses a method for treating magnesium extraction raffinate wastewater. The method comprises the following steps: recycling an extraction agent from the magnesium extraction raffinatewastewater in an oil separation tank; preparing a demulsifier by guar gum, polyacrylate and polyhydric alcohol; adding the demulsifier to the wastewater after oil removing, performing a demulsification reaction in an ultrasonic environment, and removing an emulsified product; recycling copper hydroxide, zinc hydroxide, and lead hydroxide through multi-stage precipitation; after adding a flocculating agent of Pulullan to the wastewater, performing sand filtering treatment through sand grains, separating a filter residue and clarified magnesium chloride wastewater; performing adsorption treatment on the clarified magnesium chloride wastewater by using pyrolusite, filtering, and removing a pyrolusite residue; conveying the clarified magnesium chloride wastewater to a triple-effect evaporation system, separating a magnesium chloride crystal, and recycling condensate water. Materials used in the method are non-toxic or low-toxicity, and have no secondary pollution to the environment. The magnesium chloride, the copper hydroxide, the zinc hydroxide and the lead hydroxide can be recycled, the effect of removing radioactive elements is good, the recycled extraction agent can be repeatedlyused, and the method is in comply with requirements of green environment-friendly sustainable development.

Description

technical field

[0001] The invention relates to the field of rare earth industrial wastewater treatment technology, in particular to a method for treating magnesium raffinate wastewater. Background technique

[0002] Rare earth resources are an important resource in our country and are widely used in various high-tech industries, such as manufacturing tanks, aircraft, missile precision instruments, lasers, and nuclear industries. At present, there are more and more studies on the utilization and research of rare earth resources, and a large amount of wastewater will be generated in the mining, extraction, processing and other processes of rare earths. These wastewaters may contain various pollutions, such as organic aerobic substances pollution, chemical Toxic pollution, inorganic solid suspended matter pollution, heavy metal pollution, acid pollution, alkali pollution, etc. The discharge of these wastewater into the environment will cause serious pollution of water bodies ...

Examples

Embodiment 1

[0021] (1) Recovery of extraction agent: discharge the magnesium raffinate waste water to the bottom of the grease trap in the grease trap, install an adjustable vibration device, turn on the slight amplitude, and the frequency of vibration is 250Hz to vibrate the waste water for 11 minutes, and after standing for 2.5 hours to separate layers, Recover the extractant to obtain crude magnesium chloride wastewater;

[0022] (2) Preparation of demulsifier: Add 0.7 parts of polyacrylate to 8 parts of guar gum as the initiator, add magnesium hydroxide to catalyze the addition polymerization reaction chain extension under alkaline conditions, then add 1.8 parts of pentaerythritol to branch chemically, to obtain a demulsifier;

[0023] (3) Demulsification: pass the crude magnesium chloride wastewater obtained in step (1) through the demulsification reaction bed, add a demulsifier for demulsification reaction, demulsification at a stirring rate of 880r / min for 8min, an ultrasonic frequ...

Embodiment 2

[0029] (1) Recovering the extraction agent: discharge the magnesium raffinate waste water to the bottom of the grease trap in the grease trap, install an adjustable vibration device, turn on a slight amplitude, and vibrate at a frequency of 300 Hz to vibrate the waste water for 10 minutes. After standing for 2 hours and stratify, recover Extractant, get crude magnesium chloride waste water;

[0030] (2) Preparation of demulsifier: Add 0.5 parts of polyacrylate to 9 parts of guar gum as the starting agent, add magnesium hydroxide to catalyze the addition polymerization reaction chain extension under alkaline conditions, and then add 2.4 parts of glycerin for branching , to obtain a demulsifier;

[0031] (3) Demulsification: pass the crude magnesium chloride wastewater obtained in step (1) through the demulsification reaction bed, add a demulsifier for demulsification reaction, demulsification at a stirring rate of 950r / min for 9min, ultrasonic frequency 26kHz, mixing ratio 1:1....

Embodiment 3

[0037] (1) Recovery of extraction agent: discharge the magnesium extract waste water to the bottom of the grease trap, install an adjustable vibration device, turn on the slight amplitude, the frequency of vibration is 350Hz to vibrate the waste water for 12 minutes, and after standing for 3 hours to separate, recover Extractant, get crude magnesium chloride waste water;

[0038] (2) Preparation of demulsifier: Add 0.8 parts of polyacrylate to 5 parts of guar gum as the starting agent, add magnesium hydroxide to catalyze the addition polymerization reaction chain extension under alkaline conditions, and then add 2 parts of trimethylol Ethane is branched to produce a demulsifier;

[0039] (3) Demulsification: pass the crude magnesium chloride wastewater obtained in step (1) through the demulsification reaction bed, add demulsifier for demulsification reaction, demulsification at a stirring rate of 900r / min for 10min, ultrasonic frequency 27kHz, mixing ratio 1:1, Remove the emu...

technical field

[0001] The invention relates to the field of rare earth industrial wastewater treatment technology, in particular to a method for treating magnesium raffinate wastewater. Background technique

[0002] Rare earth resources are an important resource in our country and are widely used in various high-tech industries, such as manufacturing tanks, aircraft, missile precision instruments, lasers, and nuclear industries. At present, there are more and more studies on the utilization and research of rare earth resources, and a large amount of wastewater will be generated in the mining, extraction, processing and other processes of rare earths. These wastewaters may contain various pollutions, such as organic aerobic substances pollution, chemical Toxic pollution, inorganic solid suspended matter pollution, heavy metal pollution, acid pollution, alkali pollution, etc. The discharge of these wastewater into the environment will cause serious pollution of water bodies ...

Examples

Embodiment 1

[0021] (1) Recovery of extraction agent: discharge the magnesium raffinate waste water to the bottom of the grease trap in the grease trap, install an adjustable vibration device, turn on the slight amplitude, and the frequency of vibration is 250Hz to vibrate the waste water for 11 minutes, and after standing for 2.5 hours to separate layers, Recover the extractant to obtain crude magnesium chloride wastewater;

[0022] (2) Preparation of demulsifier: Add 0.7 parts of polyacrylate to 8 parts of guar gum as the initiator, add magnesium hydroxide to catalyze the addition polymerization reaction chain extension under alkaline conditions, then add 1.8 parts of pentaerythritol to branch chemically, to obtain a demulsifier;

[0023] (3) Demulsification: pass the crude magnesium chloride wastewater obtained in step (1) through the demulsification reaction bed, add a demulsifier for demulsification reaction, demulsification at a stirring rate of 880r / min for 8min, an ultrasonic frequ...

Embodiment 2

[0029] (1) Recovering the extraction agent: discharge the magnesium raffinate waste water to the bottom of the grease trap in the grease trap, install an adjustable vibration device, turn on a slight amplitude, and vibrate at a frequency of 300 Hz to vibrate the waste water for 10 minutes. After standing for 2 hours and stratify, recover Extractant, get crude magnesium chloride waste water;

[0030] (2) Preparation of demulsifier: Add 0.5 parts of polyacrylate to 9 parts of guar gum as the starting agent, add magnesium hydroxide to catalyze the addition polymerization reaction chain extension under alkaline conditions, and then add 2.4 parts of glycerin for branching , to obtain a demulsifier;

[0031] (3) Demulsification: pass the crude magnesium chloride wastewater obtained in step (1) through the demulsification reaction bed, add a demulsifier for demulsification reaction, demulsification at a stirring rate of 950r / min for 9min, ultrasonic frequency 26kHz, mixing ratio 1:1....

Embodiment 3

[0037] (1) Recovery of extraction agent: discharge the magnesium extract waste water to the bottom of the grease trap, install an adjustable vibration device, turn on the slight amplitude, the frequency of vibration is 350Hz to vibrate the waste water for 12 minutes, and after standing for 3 hours to separate, recover Extractant, get crude magnesium chloride waste water;

[0038] (2) Preparation of demulsifier: Add 0.8 parts of polyacrylate to 5 parts of guar gum as the starting agent, add magnesium hydroxide to catalyze the addition polymerization reaction chain extension under alkaline conditions, and then add 2 parts of trimethylol Ethane is branched to produce a demulsifier;

[0039] (3) Demulsification: pass the crude magnesium chloride wastewater obtained in step (1) through the demulsification reaction bed, add demulsifier for demulsification reaction, demulsification at a stirring rate of 900r / min for 10min, ultrasonic frequency 27kHz, mixing ratio 1:1, Remove the emu...

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