Method for recovering ammonium fluoride from ammonium fluoride wastewater

A technology of ammonium fluoride and wastewater, applied in the direction of ammonium fluoride, ammonium halide, etc., can solve the problems of occupying a large space, large solid waste residue, secondary pollution, etc., to avoid secondary pollution, low evaporation temperature, and save evaporation costs Effect

Inactive Publication Date: 2020-07-14
XIAMEN STARMEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This treatment method will also produce a large amount of solid waste, which will occupy a large amount of s

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for reclaiming ammonium fluoride from ammonium fluoride wastewater, comprising the steps of:

[0017] The first step is to add hydrofluoric acid with a concentration of 1% to 100ml of ammonium fluoride wastewater, adjust the pH of the wastewater to 5.3, and convert the NH3 in the wastewater into ammonium fluoride salt and dissolve it in the wastewater.

[0018] The second step is to pump the pH-adjusted ammonium fluoride wastewater into the graphite evaporator, heat the water bath at a constant temperature of 50°C, and evaporate for 300 minutes. The graphite evaporator is a vacuum environment with a vacuum degree of 0.09Mpa. The ammonium fluoride wastewater is evaporated and concentrated at a reduced pressure and constant temperature in the graphite evaporator until all ammonium fluoride is crystallized, and the condensed water produced is reused.

[0019] The method of the present embodiment is tested, and the yield of ammonium fluoride can reach 93%.

Embodiment 2

[0021] A method for reclaiming ammonium fluoride from ammonium fluoride wastewater, comprising the steps of:

[0022] The first step is to add hydrofluoric acid with a concentration of 3% to 100ml of ammonium fluoride wastewater, adjust the pH of the wastewater to 5.3, and convert the NH3 in the wastewater into ammonium fluoride salt and dissolve it in the wastewater.

[0023] The second step is to pump the pH-adjusted ammonium fluoride wastewater into the graphite evaporator, heat the water bath at a constant temperature of 60°C, and evaporate for 80 minutes. The graphite evaporator is a vacuum environment with a vacuum degree of 0.09Mpa. The ammonium fluoride wastewater is evaporated and concentrated at a reduced pressure and constant temperature in the graphite evaporator until all ammonium fluoride is crystallized, and the condensed water produced is reused.

[0024] The method of the present embodiment is tested, and the yield of ammonium fluoride can reach 95%.

Embodiment 3

[0026] A method for reclaiming ammonium fluoride from ammonium fluoride wastewater, comprising the steps of:

[0027] The first step is to add hydrofluoric acid with a concentration of 5% to 100ml of ammonium fluoride wastewater, adjust the pH of the wastewater to 5.4, and convert the NH3 in the wastewater into ammonium fluoride salt and dissolve it in the wastewater.

[0028] The second step is to pump the pH-adjusted ammonium fluoride wastewater into the graphite evaporator, heat the water bath at a constant temperature of 70°C, and evaporate for 70 minutes. The graphite evaporator is a vacuum environment with a vacuum degree of 0.09Mpa. The ammonium fluoride wastewater is evaporated and concentrated at a reduced pressure and constant temperature in the graphite evaporator until all ammonium fluoride is crystallized, and the condensed water produced is reused.

[0029] The method of the present embodiment is tested, and the yield of ammonium fluoride can reach 85%.

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Abstract

The invention discloses a method for recovering ammonium fluoride from ammonium fluoride wastewater, which comprises the following steps: S1, adding hydrofluoric acid into the ammonium fluoride wastewater, regulating the pH value of the wastewater to 5-6, converting NH3 in the wastewater into ammonium fluoride salt, and dissolving the ammonium fluoride salt in the wastewater; and S2, pumping the ammonium fluoride waste water with the pH adjusted into an evaporator, keeping the interior of the evaporator in a vacuum environment, carrying out reduced-pressure constant-temperature evaporation onthe ammonium fluoride waste water in the evaporator at the evaporation temperature of 50-70 DEG C for 1-5 hours, continuously separating out crystallized ammonium fluoride in the evaporation process,and recycling the generated condensate water. According to the method for recycling the ammonium fluoride from the ammonium fluoride wastewater, solid waste pollutants cannot be generated in the recycling process, secondary pollution is avoided, the evaporation temperature of the evaporator is low, the evaporation cost is greatly reduced, the ammonium fluoride is recycled, condensate water is recycled, resources are reutilized, and extra economic benefits are generated.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment and recovery, in particular to a method for recovering ammonium fluoride from ammonium fluoride wastewater. Background technique [0002] Ammonium fluoride wastewater mainly comes from the production wastewater of photovoltaic enterprises, tantalum and niobium hydrometallurgy wastewater, etc. The discharge of ammonia nitrogen and fluoride ions in the wastewater will cause great pollution to the environment. The traditional treatment method is: add lime milk to the wastewater, react In the production of insoluble calcium fluoride, plate and frame filter or sand filter is used to remove suspended solids, and the clear liquid is then blown off for treatment. This treatment method will generate a large amount of solid waste residue, occupy a large amount of space for stacking, cause secondary pollution, and become the bottleneck of enterprise development. Contents of the invention [0...

Claims

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Application Information

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IPC IPC(8): C01C1/16
CPCC01C1/162
Inventor 陈俊杰徐万塔张松北陈俊明孙洪贵
Owner XIAMEN STARMEM TECH
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