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Combined treatment method for ammonia chloride waste water through rare earth extraction separation

A rare earth extraction, separation and treatment method technology, applied in the field of wastewater treatment, can solve the problems of paralysis of water treatment equipment system, affecting evaporation efficiency and product quality, and high operating costs, and achieves the effect of strengthening energy saving and environmental protection, reducing scaling and cleaning. The effect of low frequency, processing cost

Inactive Publication Date: 2014-11-12
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When ammonia water is used as saponification agent and ammonium salt is used as rare earth metal precipitant, ammonium chloride wastewater with large discharge, medium and low concentration will be produced, although the ammonium chloride in wastewater can be evaporated and crystallized by using advanced evaporation concentration process and equipment , but the operating cost is too high to bear
At the same time, because the wastewater contains impurities such as calcium and magnesium ions and oily extractants, it is easy to cause dirt during the evaporation process, which seriously affects the evaporation efficiency and product quality, and even causes the entire water treatment equipment system to be paralyzed.

Method used

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  • Combined treatment method for ammonia chloride waste water through rare earth extraction separation
  • Combined treatment method for ammonia chloride waste water through rare earth extraction separation
  • Combined treatment method for ammonia chloride waste water through rare earth extraction separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The NH4Cl wastewater with a concentration of 3.5% is discharged into the wastewater regulating tank, and after oil separation, homogenization and aeration are carried out in the regulating tank, continue to be processed in the following order (such as figure 2 shown):

[0024] a. Carry out electrocoagulation and demulsification, air flotation machine dosing and degreasing treatment to remove oily substances and suspended impurities in wastewater;

[0025] b. The waste water enters the air stirring reaction tank, adjusts the pH value to 7.0-7.5 with ammonia water, and then adds diammonium hydrogen phosphate and activated carbon powder to the waste water to precipitate and separate the calcium, magnesium and heavy metal ions in the waste water; the waste water enters the coagulation sedimentation tank and the aging tank continue processing;

[0026] c. Adsorption and filtration are carried out through a multi-media filter---activated carbon filter device;

[0027] d. U...

Embodiment 2

[0034] Containing NH4Cl wastewater with a concentration of 5.5% is discharged into a separate wastewater regulating tank, and oil separation, homogenization, and aeration are carried out in the regulating tank, and then processed in the following order (such as image 3 shown):

[0035] a. Perform electrocoagulation and demulsification, air flotation machine degreasing treatment to remove oily substances, calcium and magnesium ions and suspended solids in wastewater;

[0036] b. Wastewater enters the stirring reaction tank for treatment, adding ammonium bicarbonate to adjust the pH value to 7.0, continue to add soluble phosphate and activated carbon powder to the wastewater to remove calcium and magnesium ions, oily substances and heavy metal ions in the wastewater, and the wastewater enters the coagulation sedimentation tank Separation of precipitates and other solid impurities;

[0037] c. After the wastewater settles in the coagulation sedimentation tank for 3 hours, it en...

Embodiment 3

[0045] Discharge the NH4Cl-containing wastewater with a concentration of 15% into a separate wastewater regulating tank, and carry out oil separation, cooling and cooling, homogenization, and aeration in the regulating tank, and then process it in the following order (such as Figure 4 shown):

[0046] a. Conduct electrocoagulation demulsification, air flotation and oil removal treatment to remove oily substances, calcium and magnesium ions and suspended solids in wastewater;

[0047] b. Wastewater enters the stirring reaction tank, adding ammonia water to adjust the pH value to 7.0-7.5, then adding soluble phosphate and activated carbon powder to the wastewater to remove calcium and magnesium ions, oily substances and heavy metal ions, and entering the coagulation sedimentation tank for sedimentation reaction, keeping Sufficient residence time aging treatment;

[0048] c. Perform deep adsorption and filtration through a multi-media filter---activated carbon filter device;

...

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Abstract

The invention provides a combined treatment method for ammonia chloride waste water through rare earth extraction separation. The method mainly comprises the steps that the waste water is subjected to a series of desalting and concentration treatment through oil separation, homogenizing, aerating, electric flocculation demulsification, degreasing through an air floating machine, precipitation of calcium, magnesium and heavy metal ions through chemical feeding, microfiltration, ultrafiltration, nanofiltration, reverse osmosis, electrodialysis, evaporation, concentration and the other processes, and then desalted and purified water capable of being utilized cyclically and ammonia chloride products conforming to agricultural standards are obtained. The waste water treatment process is mature, stable and low in treatment cost; production equipment is complete and easy to operate, and automatic industrial control can be easily achieved; zero emission and resource utilization in the treatment process of the ammonia chloride waste water, with different concentrations, generated through rare earth extraction separation are well achieved.

Description

technical field [0001] The invention belongs to the technical fields of environmental engineering and chemical engineering, and in particular relates to a wastewater treatment method. technical background [0002] A large amount of ammonium chloride-containing wastewater is produced during the extraction and separation of rare earths. The polluting components in the water are mainly ammonium chloride salts. Fluoride ion 1.0-50.0mg / l, other heavy metal ions accumulatively 5.0-100.0mg / l, oil extractant and other organic pollutants 20.0-3000.0mg / l, COD500.0-5000.0mg / l, the composition of the wastewater is complex and cannot be Use conventional water treatment processes and technologies for effective governance. [0003] It is known that the rare earth smelting and separation process uses industrial-grade ammonia (NH 3 ·H 2 O), ammonium bicarbonate (NH 4 HCO 3 ), heavy base (NaHCO 3 ), soda ash (Na 2 CO 3 ), sodium hydroxide (NaOH), hydrochloric acid (HCl), and special e...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F9/10C01C1/16
CPCY02A20/131
Inventor 韩树民孟宪昴
Owner YANSHAN UNIV
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