摘要
针对半导体生产企业治理含氟废水过程中产生的含氟渣资源化利用问题,采用氟化物化学转型法使含氟渣转变为氟化钙,从而实现含氟渣的资源化利用。研究了氟化铵、氢氟酸-氟化铵、乙酸、乙酸-氟化铵等不同转型剂的转型效果,重点考察了转型剂种类、溶液pH、溶液氟浓度等对转型渣中氟化钙含量的影响。结果表明:采用乙酸-氟化铵转型剂将含氟渣转型为氟化钙的转型率最高;在液固体积质量比10 mL/1 g、乙酸用量为n(CH_(3)COOH)/[2×n(CaCO_(3))]=1.2和氟化铵用量为n(NH_(4)F)/[2×n(Ca)+4×n(Al)+6×n(Si)-n(F-)含氟渣]=1.1、搅拌时间1 h、溶液pH=3.5~4.0条件下,氟化钙质量分数为88.72%,氟化钙转型率为38.11%。通过乙酸-氟化铵分步转型,能够消除CaCO_(3)表层生成的CaF_(2)对内层CaCO_(3)进一步酸解的抑制作用,提高CaF_(2)含量和含氟渣的转型率,可为含氟渣的资源化利用提供技术参考。
To address the issue of resource utilization of fluoride-containing waste residues generated during the treatment of fluoride-containing wastewater from semiconductor manufacturing enterprises,a chemical transformation method is employed to convert fluoride residues into calcium fluoride,thereby achieving resource utilization of these residues.The transformation effects of different agents,including ammonium fluoride,hydrofluoric acid-ammonium fluoride,and acetic acid-ammonium fluoride were studied,focusing on the effects of the type of transformation agent,solution pH and fluoride concentration on the calcium fluoride content in the transformed residue.The results indicate that transformation rate is the highest for converting fluoride residues into calcium fluoride using acetic acid-ammonium fluoride as the transformation agent yields.Under conditions of liquid volume to solid mass ratio of 10 mL/1 g,acetic acid dosage of n(CH_(3)COOH)/[2×n(CaCO_(3))]=1.2,ammonium fluoride dosage of n(NH_(4)F)/[2×n(Ca)+4×n(Al)+6×n(Si)-n(F-)fluoride residue)]=1.1,stirring time of 1 h and solution pH between 3.5 and 4.0,the calcium fluoride content can reach 88.72%,with transformation rate of 38.11%.The stepwise transformation using acetic acid-ammonium fluoride can eliminate the inhibiting effect of calcium fluoride formed on the surface of calcium carbonate on the further acid dissolution of the inner layer of CaCO_(3),thereby increasing the content of CaF_(2)and the transformation rate of the fluoride-containing residues.It can provide a technical reference for the resource utilization ot fluorine-containing slag.
作者
马红周
党煜博
王耀宁
曾劲阳
王帅敏
关明华
张兴
李浩
MA Hongzhou;DANG Yubo;WANG Yaoning;ZENG Jinyang;WANG Shuaimin;GUAN Minghua;ZHANG Xing;LI Hao(School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Shaanxi Nonferrous Mining and Metallurgical Technology Co.,Ltd.,Xi’an 710077,China)
出处
《湿法冶金》
北大核心
2025年第3期353-360,共8页
Hydrometallurgy of China
关键词
氟化钙
含氟渣
转型
乙酸
氟化铵
calcium fluoride
fluorine-containing slag
transformation
acetic acid
ammonium fluoride
作者简介
第一作者:马红周(1973—),男,博士,副教授,主要研究方向为二次资源利用;通信作者:王耀宁(1975—),女,硕士,讲师,主要研究方向为材料加工。E-mail:yaoningwang@126.com。
