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Combined treatment method for sodium chloride-containing wastewater generated in dressing and smelting of rare earth

A treatment method and sodium chloride technology, which are applied in the fields of environmental engineering and chemical engineering, can solve the problems of low economic value of sodium chloride salt, unsuitability of sodium chloride-containing wastewater, and high operation cost of wastewater treatment, and achieve easy unorganized discharge. Control, no ammonia and carbon dioxide leakage, cost offset effect

Inactive Publication Date: 2014-07-23
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent CN1646429A discloses a treatment method for electrolytic alkali production after extraction and separation of high-concentration sodium chloride wastewater; this inventive technology is not applicable to the treatment of low-concentration sodium chloride-containing wastewater
[0006] Although the sodium chloride salt in the waste water can be crystallized by using the traditional evaporation and concentration process and equipment, the economic value of the sodium chloride salt extracted and separated from the waste water is very low and there is no sales market, which will cause enterprises to The operating cost of treating this kind of wastewater treatment is too high to bear

Method used

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  • Combined treatment method for sodium chloride-containing wastewater generated in dressing and smelting of rare earth
  • Combined treatment method for sodium chloride-containing wastewater generated in dressing and smelting of rare earth
  • Combined treatment method for sodium chloride-containing wastewater generated in dressing and smelting of rare earth

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Experimental program
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Effect test

Embodiment 1

[0031] Discharge the NaCl wastewater with a concentration of 3.5% into the wastewater adjustment tank, and after oil separation, homogenization, aeration, and pH adjustment in the adjustment tank, continue to process in the following order (such as figure 2 shown):

[0032] a. Carry out electrocoagulation demulsification, air flotation and oil removal treatment to remove oily substances, calcium and magnesium ions and sulfate radical precipitation in wastewater;

[0033] b. Wastewater enters the coagulation sedimentation tank, and sodium carbonate and polyacrylamide flocculants are added to the wastewater to further precipitate and separate calcium and magnesium ions and other solid substances in the wastewater;

[0034] c. Adsorption and filtration are carried out through the oil-absorbing fiber filter --- multi-media filter --- activated carbon filter device;

[0035] d. UF ultrafiltration membrane treatment to remove insoluble tiny particles in wastewater;

[0036] e. Us...

Embodiment 2

[0044] Discharge the NaCl-containing salty wastewater with a concentration of 5.5% into a separate wastewater adjustment tank, and carry out oil separation, homogenization, aeration, and pH adjustment in the adjustment tank, and then proceed in the following order (such as image 3 shown):

[0045] a. Carry out electrocoagulation demulsification, air flotation and oil removal treatment to remove oily substances, calcium and magnesium ions and sulfate radical precipitation in wastewater;

[0046] b. Wastewater enters the coagulation sedimentation tank, and sodium carbonate and polyacrylamide flocculants are added to the wastewater to further precipitate and separate calcium and magnesium ions and other solid substances in the wastewater;

[0047] c. Adsorption and filtration are carried out through the oil-absorbing fiber filter --- multi-media filter --- activated carbon filter device;

[0048] d. UF ultrafiltration membrane treatment to remove insoluble tiny particles in was...

Embodiment 3

[0058] Discharge the 15% concentration of NaCl-containing saline wastewater into the separately set wastewater adjustment tank, and carry out oil separation, homogenization, aeration, pH adjustment and dosing treatment in the adjustment tank, and then proceed in the following order (such as Figure 4 shown):

[0059] a. Carry out electrocoagulation demulsification, air flotation and oil removal treatment to remove oily substances, calcium and magnesium ions and sulfate radical precipitation in wastewater;

[0060] b. Wastewater enters the coagulation sedimentation tank, and sodium carbonate and polyacrylamide flocculants are added to the wastewater to further precipitate and separate calcium and magnesium ions and other solid substances in the wastewater;

[0061] c. Adsorption and filtration are carried out through the oil-absorbing fiber filter --- multi-media filter --- activated carbon filter device;

[0062] d. UF ultrafiltration membrane treatment to remove insoluble ti...

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Abstract

The invention relates to a combined treatment method for sodium chloride-containing wastewater generated in dressing and smelting of rare earth. According to the method, a series of desalination and concentration treatments such as deoiling, neutralizing, homogenizing, aeration, flocculation, ultrafiltration, nanofiltration, reverse osmosis, electroosmosis and MVR (mitral valve replacement) concentration are carried out on the wastewater, so that recyclable purified water is obtained; ammonium bicarbonate is added into the sodium chloride extracted from the wastewater, so that the sodium salt can be converted and regenerated into sodium bicarbonate, sodium carbonate and ammonium chloride products for dressing and smelting of the rare earth. According to the method, the recovery rate of the wastewater is high, the effluent quality is stable, the conversion rate of the sodium salt is high, and no three wastes are discharged; production equipment is compact, simple to operate, and easy to realize automation control; the problem that the sodium chloride-containing wastewater and other similar industrial wastewater generated in dressing and smelting of rare earth are difficult to recycle is solved.

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. Background technique [0002] A large amount of sodium chloride-containing wastewater is produced in the process of rare earth separation, smelting, extraction and separation. The main pollutants in the water are sodium chloride salts, the concentration range is between 400.0-140000.0mg / l, and the calcium and magnesium ions are 440.0-2000.0mg / l l, fluoride ion 1.0-20.0mg / l, other heavy metal ions accumulatively 10.0-80.0mg / l, oil extractant and other organic pollutants 20.0-3000.0mg / l, COD500.0-5000.0mg / l, the composition of the wastewater is complex , cannot be effectively treated with conventional water treatment processes and technologies. [0003] It is known that the rare earth smelting and separation process can use industrial grade ammonium bicarbonate (NH 4 HCO 3 ), heavy alkali (NaH...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C01D3/06C01D7/00C01D7/12C01C1/16
CPCY02A20/131
Inventor 韩树民孟宪昴
Owner YANSHAN UNIV
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