System for preparing ammonium bifluoride by utilizing BOE waste liquid

A technology of ammonium bifluoride and waste liquid, which is applied in the direction of ammonium fluoride, ammonium halide, chemical instruments and methods, etc., can solve the problems of high investment cost, high equipment requirements, and small investment cost, so as to avoid and reduce environmental pollution , the effect of reducing production costs

Pending Publication Date: 2020-12-04
江苏电科环保有限公司
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Problems solved by technology

[0005] In view of the existing preparation methods of ammonium bifluoride or the high requirements for equipment, large investment costs, or the high water content of the product, easy to agglomerate, difficult to store, and high production costs, the applicant researched and developed a method using BOE waste liquid to prepare Ammonium bifluoride method, and provide a system for preparing ammonium bifluoride using BOE waste liquid, which can not only avoid direct discharge of BOE waste liquid to cause environmental pollution, but also recover and prepare ammonium bifluoride products with high purity, low water content, and small investment costs. The production cost is low, and the emission of hydrogen fluoride gas can also be reduced

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  • System for preparing ammonium bifluoride by utilizing BOE waste liquid
  • System for preparing ammonium bifluoride by utilizing BOE waste liquid

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Embodiment Construction

[0019] Below in conjunction with the processing method and accompanying drawing that utilize BOE waste liquid to prepare ammonium bifluoride, the present invention will be further described:

[0020] The method for preparing ammonium bifluoride by utilizing BOE waste liquid comprises the following steps:

[0021] S1: Add barium hydroxide into the first reaction kettle with BOE waste liquid, stir for 30-60 minutes, and then filter to obtain the filtrate. The BOE waste liquid contains 0.1%-5% ammonium fluorosilicate, 0.1%- 5% ammonium sulfate, 10%~30% ammonium fluoride and 5%~20% ammonium bifluoride;

[0022] S2: Put the filtrate in the second reaction kettle, pass through anhydrous hydrogen fluoride, mix uniformly and react at 30°C-60°C until the pH of the mixed solution reaches 4-5, and obtain an ammonium bifluoride solution;

[0023] S3: Evaporate the ammonium bifluoride solution under reduced pressure in a three-effect evaporator, the evaporation time is 30-60min, the evapo...

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Abstract

The invention provides a system for preparing ammonium bifluoride by utilizing BOE waste liquid, the system not only can avoid environmental pollution caused by directly discharging the BOE waste liquid, but also can recover and prepare an ammonium bifluoride product with high purity, low moisture content, low investment cost and low production cost, and can reduce the discharge of hydrogen fluoride gas. The system comprises a BOE waste liquid storage tank, a first reaction kettle, a filtering device, a second reaction kettle, a triple-effect evaporator, a cooling crystallizer, a continuous centrifuge, a drying device and an ammonium bifluoride storage tank which are connected in sequence, a supernatant outlet of the continuous centrifuge is communicated with an inlet of the triple-effectevaporator, and the triple-effect evaporator and the drying device are connected with the inlet end of a membrane adsorption system, and the outlet end of the membrane adsorption system is communicated with the second reaction kettle.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to the technical field of BOE waste liquid treatment, in particular to a system for preparing ammonium bifluoride by using BOE waste liquid. Background technique [0002] BOE buffer etchant is hydrofluoric acid (HF) and ammonium fluoride (NH 4 F) Mixed according to different proportions, HF is the main etching solution, NH 4 F is used as a buffer. After the semiconductor element etching process, the main component of the BOE waste liquid is ammonium fluoride (NH 4 F) and ammonium bifluoride (NH 4 HF 2 ), and contain a small amount of fluorosilicate ions and sulfate ions; if discharged directly, the ammonia nitrogen and fluorine ions in it will have a serious impact on the environment. Aquatic ecosystems, and excessive fluoride ions will cause great harm to drinking water, crops and human health. [0003] Ammonium bifluoride is a white or colorless transparent ortho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01C1/16
CPCC02F9/00C01C1/162C02F1/04C02F1/38C02F1/00C02F1/44
Inventor 朱玲慧刘晓雨刘围郭维林
Owner 江苏电科环保有限公司
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