Method for recovering stainless steel acid pickling waste sulfuric acid solution
A technology of waste sulfuric acid and stainless steel, applied in separation methods, chemical instruments and methods, metallurgical wastewater treatment, etc., can solve the problems of small footprint, intensive equipment, low operating energy consumption, etc. Effect
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Embodiment 1
[0020] Reference attached figure 1 , the invention provides a kind of recycling method of stainless steel pickling waste sulfuric acid solution, specifically comprises the following steps:
[0021] 1, be 5.1% with sulfuric acid content, iron content is that 2.2% stainless steel pickling waste sulfuric acid a is filtered through the precision filter I of 1 micron order, obtains pretreatment liquid b.
[0022] 2. The volume ratio of pretreatment liquid b and tap water c is 1:0.7, and the feed flow rate of pretreatment liquid b is 400L / h. The feed condition enters the cycle reverse pulse power supply diffusion dialysis-electrodialyzer for acid and metal salts separation and recycling. Further description: the pretreatment liquid b enters the waste acid chamber II, tap water c enters the recovery acid chamber III, and the process parameters of the periodic reverse pulse power supply 4 are set to voltage 10V-15V, output pulse frequency 10Hz, positive and negative pulse wave number...
Embodiment 2
[0025] With sulfuric acid content of 5.1%, iron content of 2.2% stainless steel pickling waste sulfuric acid a as raw material; the volume ratio of pretreatment liquid b and tap water c is 1:1, the feed flow rate of pretreatment liquid b is 500L / h, cycle The output pulse frequency of the reverse pulse power supply 4 is 50 Hz, and other steps are the same as those in Embodiment 1. A recovered acid d with an acid content of 5.5%, a metal salt content of 0.05%, and a raffinate e with an acid content of 0.5% were finally obtained.
Embodiment 3
[0027] The stainless steel pickling waste sulfuric acid a with a sulfuric acid content of 24.8% and an iron content of 2.0% is used as a raw material; the feed flow rate of the pretreatment liquid b is 300L / h, and the process parameters of the periodic reverse pulse power supply 4 are voltage 15V~20V, The output pulse wave frequency is 30Hz, and other steps are the same as those in Embodiment 1. Finally, a recovered acid d with an acid content of 29.8%, a metal salt content of 0.11%, and a raffinate e with an acid content of 0.5% were obtained.
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