The fluorine-containing nitric acid liquid treatment device is a specialized equipment for treating waste liquids or solutions containing fluorine and nitric acid. Its design aims to reduce environmental pollution and achieve resource recycling and utilization. The following is a general introduction to the fluorine-containing nitric acid liquid treatment device:
1. Device Overview
Fluorinated nitric acid liquid treatment equipment usually includes multiple treatment units, which are connected together through pipelines, valves, etc. to form a complete treatment system. This system can provide targeted treatment for different components in fluorine-containing nitric acid solution to meet emission standards or achieve resource reuse.
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1. Preprocessing Unit
Function: Remove suspended solids, large particle impurities, etc. from wastewater, providing a relatively clear liquid for subsequent treatment.
Common equipment: grating, sedimentation tank, regulating tank, etc.
2. Chemical Reaction Unit
Function: By adding chemical reagents and reacting with fluorine, nitric acid, and other components in wastewater, substances that are easy to separate or treat are generated.
Common reactions: such as adding lime or calcium hydroxide to react with fluoride ions to form calcium fluoride precipitate, or adding reagents such as potassium nitrate for other chemical reactions.
Equipment: reaction kettle, mixer, etc.
3. Separation Unit
Function: Separate sediment or suspended solids generated after chemical reactions from wastewater.
Common equipment: sedimentation tank, filter, centrifuge, etc.
4. Deep Processing Unit
Function: Further purify the preliminarily treated wastewater, remove trace harmful substances, and improve the effluent quality.
Common techniques: ion exchange, membrane separation (such as reverse osmosis, nanofiltration), electrochemical treatment, etc.
5. Evaporative crystallization unit (for high salt wastewater)
Function: Remove water from wastewater through evaporation, causing salt crystals to precipitate.
Common equipment: evaporator, crystallizer, etc.
6. Exhaust gas treatment unit
Function: Process the exhaust gas generated during the treatment process to prevent it from being directly discharged into the atmosphere and causing pollution.
Common equipment: absorption tower, washing tower, etc.
3、 Working principle
The working principle of the fluorine-containing nitric acid liquid treatment device usually includes the following steps:
1. The wastewater first enters the pretreatment unit to remove suspended solids, large particle impurities, etc.
2. The pre treated wastewater enters the chemical reaction unit and reacts with the added chemical reagents to produce substances that are easy to separate or treat.
3. The wastewater after the reaction enters the separation unit, and the generated sediment or suspended solids are separated from the wastewater through precipitation, filtration, and other methods.
4. The separated wastewater enters the advanced treatment unit for further purification treatment.
If the wastewater contains high salt content, it can also be treated through an evaporation crystallization unit to obtain pure water and salt crystals.
6. The exhaust gas generated during the treatment process is treated by the exhaust gas treatment unit to prevent it from being directly discharged into the atmosphere.
IV. Application Examples
In practical applications, the fluorine-containing nitric acid liquid treatment device has been widely used in the treatment of fluorine-containing nitric acid waste liquid generated in fields such as photovoltaic solar cells and semiconductor wafer production. For example, a certain company has adopted a pressurized liquid addition reaction device for the recovery and treatment of fluorine-containing nitric acid. The potassium nitrate solution is added to the waste liquid by high-pressure injection through a booster pump, which improves the mixing effect and reaction speed, thereby accelerating the recovery speed of fluorine and nitric acid.
