Device and process for treating hydrofluoric acid purification wastewater

Abstract

The invention discloses a device and process for treating hydrofluoric acid purification wastewater. The treatment process comprises a water distribution section, a stage-A flocculating sedimentation section, a stage-B coagulating sedimentation section and a discharge section; the treatment device consists of underground equipment, a treating device and stand equipment; a two-stage coagulating sedimentation process is adopted, and a first-stage coagulation sedimentation tank is used for carrying out alkali pH adjustment, lime pH adjustment, calcium chloride and PAM flocculation reaction and fluorinion precipitation; and a second-stage coagulation sedimentation tank is used for carrying out sulfuric-acid pH value back-adjustment, PAC and PAM coagulation reaction and fluorinion precipitation, the concentration of fluorinions in supernatant is lower than 10mg/l after two-stage coagulating sedimentation, and the supernatant is discharged after reaching standard. According to the device and the process, the impact resisting load is high, the operation is effective and stable, and the operating cost is reduced; the treatment device adopts integrally-combined hydrofluoric acid wastewater treatment equipment and is manufactured through welding a polypropylene (PP) material, so that the corrosion resistance is good; and the device is simple and convenient to mount and can subject to arrangement adjustment according to on-site actual situations, and the PP material is durable and attractive.

Description

technical field [0001] The invention relates to the technical equipment field of fluorine-containing wastewater treatment, in particular to a hydrofluoric acid purification wastewater treatment device and process. Background technique [0002] As one of the new chemical materials, the fluorine chemical industry is known as the gold industry due to the high performance and high added value of the products. For a long period of time, the fluorine chemical industry is also one of the fastest growing industries in the chemical industry. 1. However, in the process of rapid development of fluorine chemical industry, the ubiquitous pollution problems also restrict the development of my country's fluorine chemical industry; the composition of fluorine-containing wastewater in fluorine chemical industry is complex and often contains a large amount of fluorine, ammonia and other impurity ions . However, fluorine is a toxic pollutant, and non-standard discharge will cause huge pollution...

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Problems solved by technology

[0004] However, this method has the following disadvantages: in the process of dosing, it is difficult to control the dosing amount due to climate, process, raw material purity, impurities in wastewater (such as: ammonia), drug solubility and other reasons, so the phenomenon of wastewater exceeding the standard often occurs; especially Especially in the purification of hydrofluoric acid, the discharged wastewater contains a high concentration of fluorine, so the effluent from the existing simple lime-adding primary coagulation and sedimentation process is difficult to meet the discharge requirements stipulated by the state; the wastewater from hydrofluoric acid purification has a strong Corrosive, so ordinary equipment is prone to aging and corrosion, resulting in damage; due to the strong acidity of hydrofluoric acid wastewater, simple addition of alkali or lime is used, the pH adjustment is unstable, and the dosage is very large; the existing treatment of hydrofluoric acid Acid equipment mostly adopts steel concrete lined with FRP epoxy anticorrosion. When the equipment is arranged, the placement method is fixed, and the flexibility is not strong, so it cannot be adjusted according to the actual situation on site.

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