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Method for recycling acid liquor by utilizing aluminum-containing electric cast liquid and fluorine-containing wastewater

A technology for resource utilization and acid recovery, applied in aluminum fluoride, aluminum halide, electrolysis process, etc., can solve the problems of low energy consumption and high reaction efficiency, and achieve low energy consumption, high reaction efficiency, and no secondary pollution. Effect

Inactive Publication Date: 2017-01-25
嘉善蓝欣涂料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method has high reaction efficiency, low energy consumption and no secondary pollution

Method used

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  • Method for recycling acid liquor by utilizing aluminum-containing electric cast liquid and fluorine-containing wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Fluorine-containing wastewater: pre-treat the fluorine-containing wastewater produced by the smelting plant with quartz sand filtration to remove some large particles of impurities. The fluoride-containing wastewater mainly contains H + , F - , SO4 2- 、Na +Plasma. The pretreated fluorine-containing wastewater is stored in the storage tank 1 . A fluoride ion analyzer is installed in the storage tank 1 to detect the fluoride ion concentration, and the measurement result is 0.9g / L; the sodium ion concentration of the fluorine-containing wastewater in the storage tank 1 is detected, and the sodium ion meter is used for detection, and the measurement result is 0.7 g / L; the fluorine-containing wastewater in storage tank 1 is tested for sulfate ion, and the spectrophotometric method is used for detection, and the measurement result is 25g / L; the pH of the fluorine-containing wastewater in storage tank 1 is detected, and a pH meter is used for detection. The measurement res...

Embodiment 2

[0040] The pretreatment of fluorine-containing wastewater is the same as in Example 1.

[0041] The fluorine-containing waste water produced in the smelting plant is pretreated by quartz sand filtration, and the pretreated fluorine-containing waste water is stored in the storage tank 1 . The detection of the fluorine-containing wastewater in the storage tank 1 is as follows: the pH of the wastewater is 1.2; the concentration of fluoride ions is 1.1 g / L; the concentration of sodium ions is 0.8 g / L; the concentration of sulfate ions is 30 g / L.

[0042] The pretreatment of aluminum-containing electropolishing liquid is the same as in Example 1

[0043] The aluminum-containing electropolishing liquid is pretreated by quartz sand filtration and collected into storage tank 2, and aluminum ions in the electropolishing liquid in storage tank 2 are detected. The pH of the wastewater is 2; the concentration of aluminum ions is 33g / L; the concentration of phosphate ions is 15g / L; the su...

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Abstract

The invention belongs to the field of wastewater treatment and specially relates to a method for recycling acid liquor by utilizing aluminum-containing electric cast liquid and fluorine-containing wastewater. The method comprises the following steps: pre-treating the fluorine-containing wastewater and then collecting to a storage tank 1; pre-treating the aluminum-containing electric cast liquid and then collecting to a storage tank 2; taking the fluorine-containing wastewater in the storage tank 1 and the aluminum-containing electric cast liquid in the storage tank 2, stirring in a reaction kettle and reacting for 1-5 hours at 10-110 DEG C under 1-5Kg reaction pressure, wherein the stirring speed is 100-300rpm; discharging the reaction material in the reaction kettle into a settling tank and precipitating for 0.5-2 hours; pumping the precipitate in the settling tank into a press filter and dewatering, thereby obtaining cryolite; discharging the acid liquor in the settling tank into a recycling tank and standing by. According to the invention, the hybrid reaction of aluminum-containing electric cast liquid and fluorine-containing wastewater is utilized to generate sodium fluoroaluminate precipitate and the acid liquor is recycled, so that the recycling of fluorine and acid liquor resources can be realized, the energy consumption is low, no secondary pollution is caused and the cost is low.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a method for resource recovery of acid liquid by utilizing aluminum-containing electropolishing liquid and fluorine-containing waste water. Background technique [0002] The smelting industry uses fluorine salts and fluorides in the production process, consumes aqueous solutions such as acids, alkalis, and salts, uses chemical methods to extract the required metal components, and then uses aqueous solution electrolysis to produce metals. The resulting fluorine-containing wastewater, Direct discharge will cause great pollution to the environment. At present, the common treatment process generally adopts multiple chemical precipitation treatments, so that fluoride ions are precipitated and removed by calcium fluoride. Because calcium fluoride is soluble in acid, this method uses adding lye to increase the pH of the solution, and adding calcium salts, so that fluorid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/54C25F7/02
CPCC01F7/54C25F7/02
Inventor 施佳弟
Owner 嘉善蓝欣涂料有限公司
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