Processing method of stainless steel cold rolling pickling wastewater
A technology for pickling wastewater and its treatment method, which is applied in the fields of metallurgical wastewater treatment, water/sewage treatment, adsorbed water/sewage treatment, etc., and can solve the problems of high cost of chemicals, difficulty in effective utilization of filter residues, secondary pollution of heavy metal concentrates, etc.
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[0125] Example 1
[0126] Use shot blasting iron powder from the cold rolling process of stainless steel, soak in 10% NaOH lye for 30 minutes to remove oil, rinse to neutral pH, and then immerse in 3% HCl acid solution for 30 minutes to remove rust. After activation treatment Then, it is mixed with activated carbon particles and porous ceramic fillers in a ratio of 1:0.2:0.3 to form the filter material of the iron filings filter; the iron filings filter adopts one for use and one preparation, and each filter adopts the dynamics of water inlet at the bottom and water outlet at the top. Upstream filtration method; iron powder is contained in a stack of shallow tray structures. There are 6 layers in the shallow tray. The thickness of the filter material at the bottom of the tray is 200mm. The tray can be dynamically added or removed. 0.01m 3 / h of pickling wastewater is introduced into the iron filings filter, and the test aeration head is used for aeration, the aeration intensity i...
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[0138] Example 2
[0139] The acid regenerated iron powder from the cold rolling process of stainless steel is selected. After soaking in 10% NaOH lye for 30 minutes to remove oil, after washing until the PH value is neutral, it is soaked in 3% HCl acid solution for 30 minutes to remove rust, and then activated. Then, it is mixed with activated carbon particles and porous ceramic fillers in a ratio of 1:0.1:0.5 to form the filter material of the iron filings filter; the iron filings filter adopts one use and two preparations, and each filter adopts the dynamics of water inlet at the bottom and water outlet at the top. Upstream filtration method; iron powder is contained in a stack of shallow tray structures. There are 10 layers in the shallow tray. The thickness of the filter material at the bottom of the tray is 10mm. The shallow tray can be dynamically added or removed. 10m 3 / h of pickling wastewater is introduced into the iron filings filter, and the test aeration head is use...
Example Embodiment
[0151] Example 3
[0152] Select acid reclaimed iron powder and shot blasted iron powder (half each) from the cold rolling process of stainless steel. After soaking in 10% NaOH lye for 30 minutes to remove oil, rinse until the pH is neutral, then use 3% HCl Soak in acid solution for 30 minutes to remove rust. After activation treatment, mix with activated carbon particles and porous ceramic filler at a ratio of 1:0.1:0.5 to form the filter material of the iron filings filter; the iron filings filter adopts one for use and one for each filter. The pond adopts a dynamic upflow filtration method with water at the bottom and water at the top; the iron powder is contained in a stack of shallow tray structures. There are 12 layers in the shallow tray, and the thickness of the filter material at the bottom of the tray is 50mm. The shallow tray can be dynamically added or removed . 10m 3 / h of pickling wastewater is introduced into the iron filings filter, and the test aeration head is ...
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