Process for treating acid waste water containing copper, nickel and the like by membrane method

Abstract

The invention provides a process for treating acid waste water containing copper, nickel and the like by a membrane method, discloses a process for treating and recycling acid waste water containing noble metal ions for non-ferrous metal mine, smelting, ore dressing and the like through a sedimentation tank, a fiber filter, ultra-micro filtration and reverse osmosis / nano filtration, and belongs to the technical field of waste water treatment and resource recycle. The process is characterized by treating the waste water and furthest reclaiming valuable metal ions and water resources in the waste water at the same time so as to achieve the purposes of treating and recycling the waste water and basically realizing zero emission of the waste water. Moreover, the water produced by the reverse osmosis / nano filtration is used as back washing water for the filter and the ultra-micro filtration so as to improve the cleaning effect of the filter and the ultra-micro filtration and the reclaiming rate of valuable metals; the pollution and plugging of iron and silicon in the water to the membrane are effectively overcome by adopting ultra-micro filtration treatment, adding a reducing agent and using the produced water flushing function of the device; and the scaling problem of sulfate such as calcium, strontium, barium and the like in the thick water is effectively solved by adopting special design of a desalting system and special scale inhibiting technology, and the long-term stable operation of the system is ensured.

Description

Technical field: [0001] A process for treating acidic wastewater such as non-ferrous metal mines, smelting, mineral processing, and electroplating by ultra-microfiltration, reverse osmosis / nanofiltration, etc., which belongs to the technical field of wastewater treatment and resource reuse. The valuable metal ions and water resources in the waste water are recovered to the greatest extent, the waste water is treated as a resource, and the goal of zero discharge of waste water is basically realized. Background technique: [0002] Acidic wastewater containing copper and nickel is the most harmful industrial wastewater in a wide range of wastewater. It is widely found in non-ferrous metal mines, metal smelting, mineral processing and electroplating industries, such as mine water from copper mines, extracts from hydrometallurgical smelting, etc. Remaining liquid, mine beneficiation wastewater, etc. The traditional treatment methods mainly include lime neutralization method, sul...

AI Technical Summary

Problems solved by technology

Although there have been reports of application in China, such as a method for treating acidic wastewater by membrane method disclosed in Patent Application No. -200610086878.7, its essence is a kind of molybdenum ore dressing wastewater. Calcium, strontium sulfate, barium sulfate and other metal insoluble salts scaling problem (current polyacrylic acid or organic phosphorus scale inhibitors can only work in the neutral pH range, and the scale inhibition performance is lost under acidic conditions) and membrane iron fouling problem, its effectiveness in industrial applications is questionable

Another example is that disclosed in Patent Application No. 200610096133.9 is a technology that adopts nanofiltration technology to treat electroplating wastewater. Since the components of electroplating acidic wastewater are relatively simple, except for metal ions of copper and nickel in the wastewater, other metal ions are basically trace amounts. There is no scaling problem of calcium sulfate, strontium and barium, and no fouling problem of iron. Therefore, this invention is not comparable to the membrane technology for treating non-ferrous metal mines and smelting wastewater. In addition, since the nanofiltration membrane is used as the membrane for treatment , the product water contains a large amount of acid and other monovalent ions, the product water is not suitable for direct reuse as industrial water, and the secondary neutralization will also consume a large amount of alkali or lime

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