KR950003179A

KR950003179A - Treatment method of waste water containing fluorine

Info

Publication number: KR950003179A
Application number: KR1019930012855A
Authority: KR
Inventors: 홍영호; 노재호; 우상모; 박상호
Original assignee: 박수환; 주식회사 럭키금속
Priority date: 1993-07-08
Filing date: 1993-07-08
Publication date: 1995-02-16
Also published as: KR960002260B1

Abstract

본 발명은 용존불소 이온을 함유한 폐수에 가용성 희토류화합물을 첨가하여 불소이온을 고 효율로 제거함과 함께 희토류를 회수하여 재사용함으로서 경제적으로도 유리한 폐수처리에 관한 것으로, 불소가 함유된 폐수에 가용성 희토류화합물을 불소와 결합하는 화학반응 당량의 2-10배 첨가하고, PH를 조절하는 제 1 공정과, 제 1 공정에 이어서 고액분리하여 불소가 저농도 제거된 액체는 방류하고 희토불화물과 희토류수산물은 슬러지(Sludge)로 하는 제 2 공정과, 제 2 공정을 통한 슬러지에 무기산을 첨가하여 PH를 조절함과 함께 희토류수산화물을 선택적으로 용해한 후 고액분리하여 희토류를 포함한 액체를 회수하여 재사용하고 희토불화물은 고체로 회수하는 공정으로 이루어짐을 특징으로 하는 불소가 함유된 폐수의 처리방법에 관한 기술임.The present invention relates to an economically advantageous wastewater treatment by adding soluble rare earth compounds to wastewater containing dissolved fluorine ions to efficiently remove fluorine ions and recovering and reusing rare earths. The present invention relates to soluble rare earths in fluorine-containing wastewater. The compound is added 2-10 times the chemical reaction equivalent of fluorine, and the first step of controlling the PH, followed by the first step is solid-liquid separation to discharge the liquid with low concentration of fluorine, and the rare earth fluoride and rare earth aquatic product are sludge. In addition, inorganic acid is added to the sludge through the second process and sludge through the second process to adjust the pH, and selectively dissolve the rare earth hydroxide, and then solid-liquid separation to recover and reuse the liquid containing the rare earth. Technology for the treatment of fluorine-containing wastewater, characterized in that consisting of a process of recovering.

Description

Treatment method of waste water containing fluorine

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 불소기 함유된 폐수의 처리 공정도, 제2도는 선택적 용해 공정인 PH 조정 공정을 거치기전과 후의 X 선회절 분석 결과의 피크(Peak)로서, (가)는 선택적 용해공정전의 상태도 (나)는 선택적 용해 공정후의 상태도.FIG. 1 is a process flow chart of wastewater containing fluorine groups, and FIG. 2 is a peak of X-ray diffraction analysis results before and after the pH adjustment process, which is a selective dissolution process. B) State diagram after the selective dissolution process.

Claims

The fluorine-free wastewater is added to the fluorine-containing waste water by adding 2-10 times the equivalent of a chemical reaction equivalent to fluorine, and controlling the pH, followed by the first step to solid-liquid separation to remove fluorine. The rare earth fluoride and rare earth hydroxide are sludge, and the inorganic acid is added to the sludge through the second step to adjust the pH, selectively dissolve the rare earth hydroxide, and then liquid-separate the liquid containing rare earth. A method for treating fluorine-containing wastewater, wherein the effluent is recovered and reused and the rare earth fluoride is recovered as a solid.

The method of treating fluorine-containing wastewater according to claim 1, wherein the soluble rare earth compound is a solution selected from chloride, sulfide and nitride as a soluble rare earth salt.

The method for treating fluorine-containing wastewater according to claim 1, wherein the fluorine-containing wastewater is formed in a first process having a pH of 5-10.

The method for treating fluorine-containing wastewater according to claim 1 or 3, wherein the rare earth hydroxide is dissolved to have a pH of 2.5-5.5 after the second process.

The method of treating wastewater containing fluorine according to claim 4, wherein the alkali used for pH adjustment is selected from caustic soda, potassium hydroxide and ammonia water.

The method of treating wastewater containing fluorine according to claim 4, wherein the acid used for pH adjustment is selected from hydrochloric acid, nitric acid and sulfuric acid.

※ Note: The disclosure is based on the initial application.