Method for treating rare-earth comprehensive wastewater by forward osmosis membrane separation

A technology of integrated wastewater and forward osmosis membrane, applied in multi-stage water treatment, water/sewage treatment, metallurgical wastewater treatment, etc., can solve undiscovered problems, achieve good stability, low energy consumption for treatment, and easy recycling Effect

Inactive Publication Date: 2015-02-18
INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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  • Claims
  • Application Information

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  • Method for treating rare-earth comprehensive wastewater by forward osmosis membrane separation

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Embodiment 1

[0052] Rare earth comprehensive wastewater sample 1, in which the concentration of sodium chloride is 42.80g / L, the concentration of calcium ion is 0.63g / L, the concentration of magnesium ion is 14.8mg / L, the concentration of ammonia nitrogen is 22.6mg / L, and the concentration of fluoride ion is 2.0mg / L L, COD concentration 5.0mg / L, sample pH value 4.2.

[0053] A method for separating and treating rare earth comprehensive wastewater by forward osmosis membrane, the method is carried out according to the following steps:

[0054] (1) Pretreatment: pretreatment of rare earth comprehensive wastewater, oil-water separation treatment of rare earth comprehensive wastewater, and removal of residual extractant in wastewater. Add sodium carbonate to the wastewater to adjust the pH of the wastewater to 7.0, and at the same time remove the precipitates produced by the reaction of carbonate and calcium and magnesium ions in the wastewater, so that the concentration of calcium and magnesi...

Embodiment 2

[0061] Rare earth comprehensive wastewater sample 1, in which the concentration of sodium chloride is 42.80g / L, the concentration of calcium ion is 0.63g / L, the concentration of magnesium ion is 14.8mg / L, the concentration of ammonia nitrogen is 22.6mg / L, and the concentration of fluoride ion is 2.0mg / L L, COD concentration 5.0mg / L, sample pH value 4.2.

[0062] A method for separating and treating rare earth comprehensive wastewater by forward osmosis membrane, the method is carried out according to the following steps:

[0063] (1) Pretreatment: pretreatment of rare earth comprehensive wastewater, oil-water separation treatment of rare earth comprehensive wastewater, and removal of residual extractant in wastewater. Add sodium carbonate to the wastewater, adjust the pH of the wastewater to 7.5, and remove the precipitates produced by the reaction of carbonate and calcium and magnesium ions in the wastewater, so that the concentrations of calcium and magnesium ions in the was...

Embodiment 3

[0070] Rare earth comprehensive wastewater sample 1, in which the concentration of sodium chloride is 42.80g / L, the concentration of calcium ion is 0.63g / L, the concentration of magnesium ion is 14.8mg / L, the concentration of ammonia nitrogen is 22.6mg / L, and the concentration of fluoride ion is 2.0mg / L L, COD concentration 5.0mg / L, sample pH value 4.2.

[0071] A method for separating and treating rare earth comprehensive wastewater by forward osmosis membrane, the method is carried out according to the following steps:

[0072] (1) Pretreatment: pretreatment of rare earth comprehensive wastewater, oil-water separation treatment of rare earth comprehensive wastewater, and removal of residual extractant in wastewater. Add sodium carbonate to the wastewater, adjust the pH of the wastewater to 6.3, and remove the precipitates produced by the reaction of carbonate and calcium and magnesium ions in the wastewater, so that the concentration of calcium and magnesium ions in the wastew...

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Abstract

The invention discloses a method for treating rare-earth comprehensive wastewater by forward osmosis membrane separation, and belongs to the technical field of environmental engineering wastewater treatment. The method comprises the following steps: by taking pretreated rare-earth comprehensive wastewater as feed liquid and taking a sodium carbonate solution as a driving fluid, concentrating the rare-earth comprehensive wastewater by using a forward osmosis membrane separation method, so that the driving fluid is diluted; mixing the diluted driving fluid with chlorinated rare-earth enrichment liquid enriched by using a rare-earth production process, so that a rare-earth carbonate precipitate and precipitate waste liquid are generated; feeding a rare-earth precipitate enriched substance into a subsequent rare-earth production process; and preparing sodium chloride crystals by taking a concentrated solution of the rare-earth comprehensive wastewater on the feed liquid side, after being subjected to impurity removal, as a chlorine salt electrolysis raw material, or through carrying out evaporation and concentration. According to the method, a forward osmosis membrane separation process and a rare-earth double salt precipitation process are combined together, and sodium chloride-containing waste liquid is applied to a rare-earth production process, so that the zero release of medium/high-concentration sodium chloride-containing rare-earth waste liquid can be realized, therefore, the method has the characteristics of good treatment effect and environmental friendliness.

Description

[0001] technical field [0002] The invention relates to the technical field of environmental engineering wastewater treatment, in particular to a treatment method for rare earth comprehensive wastewater. Background technique [0003] At present, the domestic treatment of rare earth comprehensive wastewater is mainly to remove the characteristic pollutant - ammonia nitrogen. There are chemical precipitation method, vacuum distillation crystallization method, stripping stripping method, ion exchange method, ultrafiltration-stripping combination method, breakpoint chlorination method, etc. These methods have their own advantages in removing ammonia nitrogen in rare earth dressing and smelting waste liquid, but none of them can reduce the sodium chloride content in wastewater. In recent years, many rare earth enterprises have improved their production processes, using caustic soda or soda ash for saponification, and no longer using carbonic acid or ammonium carbonate salts but...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02C02F9/10C01D3/04C02F103/16
CPCC01D3/04C02F1/04C02F1/40C02F1/445C02F1/5236C02F1/66C02F9/00C02F2103/16C02F2301/08
Inventor 罗宇智沈明伟李博李元坤廖祥文
Owner INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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