摘要
采用分步硫化沉淀法处理铜、砷含量较高的废硫酸，先用石灰乳中和废硫酸制得石膏，然后用硫化钠分步沉淀铜、砷，控制一级硫化反应ｐＨ 值２ 、氧化还原电位值２００ ～２５０ ｍ Ｖ、反应温度５０ ～６０ ℃、反应时间２ ｈ ，优先实现铜的沉淀；控制二级硫化反应ｐＨ 值１５ ～２ 、氧化还原电位０ ～５０ ｍ Ｖ，实现砷的沉降。铜滤饼返回熔炼系统，砷滤饼堆存。
First,waste sulphuric acid is neutralized by lime to produce gypsum,and then,Cu,As in waste acid are precipitated by adding sodium sulphide in two continuative stages Cu is precipitated at pH?2 and 50～60?℃ with oxidation reduction potential of 200～250mV and resident time of 2h in the first stage and As is precipitated at pH1 5～2 with oxidation reduction potential of 0～50mV in the second stage Cu filter cake is returned to smelting system and As filter cake is landfilled
出处
《硫酸工业》
CAS
1999年第5期24-27,55,共4页
Sulphuric Acid Industry
关键词
硫酸厂
废酸处理
分步硫化
沉淀法
废水处理
Smelter Sulphuric acid plant Waste sulphuric acid treatment Sulphiding precipitation Operation
