拡散透析膜法によるステンレス鋼酸洗の定濃度操業
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概要
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An innovative technology of stainless steel pickling by fixed concentration HF/HNO3 mixtures through diffusion dialysis acid reclamation has been developed and put into practical operation by Daido Steel collaborated with UNITIKA. The system is composed of main parts.1. Automated analyzing controllers of HF, HNO3 and dissolved metal.2. Diffusion dialysis cells utilizing ion-selective membranes.3. Acid replenishment apparatuses.The system was installed in July, 1989 in 12000t/month capacity pickling line at Hoshizaki Work of Daido Steel. It has been in operation successfully, and has shown effective as follows.1. Short lead-time and less inventory300 series and 400 series stainless steel used to be pickled in different chances, but now they can be pickled at any time.2. Stable quality controlFixed concentrations leads to good reproductivity in descaling.3. Reduction by half of the acid costThe ion-selective membrane allows retrieving the acids from the waste acids.4. Ecological conservationThe reclamation of acids reduces waste generation by half.
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