硝酸水溶液のリサイクル方法、それを用いた電解加工方法、硝酸水溶液のリサイクル液、及びリサイクルシステム

Japanese Patent JP7269850

B2

To provide a recycling method for aqueous nitric acid solution with excellent manufacturing stability.SOLUTION: A recycling method for reusing a waste liquid containing nitrate ions, water, and chromium ions, has a reduction step in which Cr6+ contained in the waste liquid is reduced to Cr3+ so that the concentration of Cr6+ in the waste liquid is 5.0 ppm or less, and a separation step in which the wastewater containing Cr3+ is permeated through a reverse osmosis membrane to obtain the permeate containing nitrate ions and water after the reduction step.SELECTED DRAWING: Figure 1

WO/2024/114370	PREPARATION METHOD FOR NANOFILTRATION MEMBRANE AND NANOFILTRATION MEMBRANE PREPARED BY USING SAME
JPH04108653	PRODUCTION OF UNGLAZED CERAMICS AND PRODUCTION OF ECOLOGICAL WATER
WO/2003/022745	SELF CONTAINED WATER FILTER HAVING ZEOLITES, FILTRATION MEMBRANES AND WATER FLOW RATE CONTROL MEANS

Shunjiro Watanabe
Kazuhiro Ando
Shinya Oka
Tomoaki Kuroda

JP2019166918A

May 09, 2023

September 13, 2019

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Electric Discharge Precision Processing Laboratory Co., Ltd.

C02F1/44; B01D61/02; B01D61/04; B01D65/06; B23H3/10; C02F1/70

JP57190692A
JP50061379A
JP2016172219A
JP53115557A
JP2011025114A
JP2018089614A
JP2012196590A

Shinji Hayami

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