CAJ | 학술논문

提出一种处理高砷污酸的三段石灰-铁盐法。第一段利用石灰乳中和污酸中的硫酸,得到非危险固体石膏,可作为水泥生产添加剂;第二段通过调节pH值和（或）加入氧化剂生成亚砷酸钙或砷酸钙,将砷高度富集在渣中,以便后续资源化利用或稳定化处理;第三段利用铁盐去除残留砷,使水达标排放。该法在冶炼烟气制酸和硫铁矿制酸的污酸处理试验中取得了良好的结果。
제출일충처리고신오산적삼단석회-철염법。제일단이용석회유중화오산중적류산,득도비위험고체석고,가작위수니생산첨가제;제이단통과조절pH치화（혹）가입양화제생성아신산개혹신산개,장신고도부집재사중,이편후속자원화이용혹은정화처리;제삼단이용철염거제잔류신,사수체표배방。해법재야련연기제산화류철광제산적오산처리시험중취득료량호적결과。
A three-stage lime-ferric salt treatment process is proposed for treating high-arsenic waste acid from off-gas or pyrited-based sulphuric acid plants. In the first stage, non-dangerous solid gypsun waste is produced by neutralization with lime, which could be used as additive for cement production. In the second stage, arsenic is highly concentrated in residues by adjusting pH and/or adding oxidant to produce calcium arsenite or arsenate, which is suitable for recycle or stabilizing treatment. In the third stage, wastewater is treated by iron salt to further remove arsenic and meet industrial discharge standards. The good results were obtained in the tests treating waste acids from off-gas and pyrite-based sulphuric acid plants.