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        Acid Purification Unit

        This retardation process is based on the separation of the free acid from the metals in a resin bed. Practically it is suitable for all pickling solutions such as HF/HNO3, H2SO4, and HF/H2SO4 etc.


        In the Steuler Acid Pruitfication Unit (SAPU) the free acid is separated from the metals in a resin bed.

        The acid absorbed in the resin bed is eluted with water in a second step and returned to the pickling

        line,  while the solution that contains metal salts and is deficient in acid is disposed  at waste water treatment plant.


        Process description:
        In order to guarantee the long-term and safe application of  the Steuler Acid Purification Unit (SAPU)

        it is necessary to pretreat the hot,solid-containing pickling solutions: In principal always a complete

        solid removal is required  ensuring that no particles at all permeate into resin bed and thus causing blockings, increased pressure loss and reduced capacity. This can be done by our Steuler Acid Micro-

        filtration (SAM).


        According to the temperature, the kind of the pickling acid and the pickling concentrations, it is nece-

        ssary to cool acid liquor before the Steuler Acid Purification Unit (SAPU) in order to adjust the optimal operating temperature.  This concerns,  in particular, the recovery of hot sulfuric acid and mixed acid purification. The cooling is designed like the one for the Steuler Acid Microfiltration (SAM):  as a cost-

        efficient single-stage or two-stage cooling based on heat recovery.


        The Steuler Acid Purification Unit (SAPU) uses  an ion exchange resin  that adsorbs the strong acids

        from the solution. With water the acid can be desorbed from the resin once again, though. Thus the alternating passing of metal-containing acid and water  through a bed of resin makes it possible to separate the free acid from the metal salts.


        There are two steps in the basic Steuler Acid Purification Unit (SAPU) process:  the upstroke and the downstroke.  During the upstroke filtered, metal-containing acid is pumped into the bottom of  resin

        bed.  The acid is adsorbed by resin and  the remaining de-acidified metallic salt solution is  collected

        from the top of the bed.  During the following downstroke water is pumped into the top of the bed,

        where it desorbs the purified acid from the resin, and is returned to the pickling line as regenerated

        acid. The total cycle lasts a few minutes and is automatically controlled.

        The waste acid from the regeneration is collected  together with the concentrated sludge  from the

        pre-filtration/sedimentation in the sump pit and conveyed to the waste water treatment plant.


        The main benefits are:
        — High recovery rate of the free acid entailing a short payback period for small-sized plants, in particular for mixed acid (HF/HNO3)
        — Saving in operating costs by reduced sludge production and consumption of neutralizer in the waste water treatment plant
        — Easy plant design and operation of the recovery system
        — Pre-assembly of the plants ensures short delivery periods with low assembly costs at the job-site

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