一种从含金属离子的废酸中回收纯酸并再生碱的方法

Method for recycling pure acid from metallic ion containing waste acid and regenerating alkali

Abstract

Disclosed is a method which recovers pure acid from the waste acid contains metallic ion and reproduces alkaline, and belongs to the environmental protection field. The process steps include that: (a) the waste acid solution with the acid concentration 10%-40% is processed with the first level diffusion dialysis; (b) the residue after the step a is processed with the second level diffusion dialysis; the volume ratio of the first level (or the second level) waste acid (or the first level diffusion residue) in the first level (or the second level) diffusion dialysis groove residue and the acid recovery chamber collected solution is 1:0.5-1:3.0; the flow rate of the waste acid (or the first level diffusion residue) is enabled to be 0.2-0.6L/h; the flow rate of the acid recovery chamber collected solution is 0.1-1.8L/h; (c) the second residue after the step b is processed with neutralization and deposition; (d) the neutralized filtrate after the solid-liquid separation-filtration is fed to the three compartment electrodialysis groove middle chamber, the electrodialysis is processed for 1-3h under the voltage 5-15V to obtain the reproduction acid and reproduction alkaline. The method which recovers pure acid from the waste acid contains metallic ion and reproduces alkaline has the advantages of high acid recovery rate, low production cost and energy-consumption, less film pollution, saving water, reducing discharge and no secondary pollution.
一种从含金属离子的废酸中回收纯酸并再生碱的方法,本发明属于环境保护领域。工艺步骤为:(a)先将酸浓度为10%~40%的废酸液进行第一级扩散渗析;(b)经步骤a后的一次残液进行第二级扩散渗析,第一级(或第二级)扩散渗析槽残液室的废酸(或一级扩散残液)与其酸回收室收集液的体积比为1∶0.5~1∶3.0,且使废酸(或一级扩散残液)的流量为0.2~0.6L/h,酸回收室收集液的流量均为0.1~1.8L/h;(c)经步骤b后的二次残液进行中和沉淀;(d)经固液分离-过滤后的中和滤液进入三隔室电渗析槽中间室,在电压5~15V条件下电渗析1~3h后,制得再生酸和再生碱。本发明具有酸回收率高、生产成本和能耗低、膜污染少、节水减排、无二次污染等优点。

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