Method for preparing nanometer iron ferric oxide from iron and steel pickling wastewater
A ferroferric oxide and steel pickling technology, which is applied to ferrous oxides, chemical instruments and methods, iron oxide/iron hydroxide, etc., can solve serious secondary pollution, large equipment investment, and blockage of equipment pipelines and other problems, to achieve the effect of reducing the concentration of ferrous ions
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Embodiment 1
[0025] The method for preparing nano-scale ferroferric oxide by iron and steel pickling wastewater consists of the following steps:
[0026] (1) Filter the steel pickling wastewater to remove suspended solids in the wastewater, and heat to 30°C;
[0027] (2) Add hydrogen peroxide to oxidize part of the ferrous ions in the waste water to ferric ions, and control the molar ratio of ferrous ions to ferric ions to be 1:1.7, stop adding hydrogen peroxide;
[0028] (3) add sodium citrate, control the concentration of sodium citrate in the waste water to be 1g / L;
[0029] (4) Add sodium hydroxide, after the pH value of waste water is adjusted to 10, stop adding sodium hydroxide; Add sodium metasilicate afterwards, the addition of sodium metasilicate is 2g / L;
[0030] (5) Continue heating the solution obtained in step (4) to 60° C., keep it warm for 1 hour, and then cool it naturally to room temperature;
[0031] (6) After solid-liquid separation, the obtained solid powder is washed...
Embodiment 2
[0033] The method for preparing nano-scale ferroferric oxide by iron and steel pickling wastewater consists of the following steps:
[0034] (1) Filtrate the steel pickling wastewater to remove suspended matter in the wastewater, and heat it to 40°C;
[0035] (2) Add hydrogen peroxide to oxidize part of the ferrous ions in the waste water into ferric ions, and control the molar ratio of ferrous ions to ferric ions to be 1:1.8, stop adding hydrogen peroxide;
[0036] (3) add sodium citrate, control the concentration of sodium citrate in the waste water to be 3g / L;
[0037] (4) Add sodium hydroxide, after the pH value of waste water is adjusted to 11, stop adding sodium hydroxide; Add sodium metasilicate afterwards, the addition of sodium metasilicate is 3g / L;
[0038] (5) Continue heating the solution obtained in step (4) to 70° C., keep it warm for 2 hours, and then cool it naturally to room temperature;
[0039] (6) After solid-liquid separation, the obtained solid powder i...
Embodiment 3
[0041] The method for preparing nano-scale ferroferric oxide by iron and steel pickling wastewater consists of the following steps:
[0042] (1) Filtrate the steel pickling wastewater to remove suspended solids in the wastewater, and heat to 50°C;
[0043] (2) Add hydrogen peroxide to oxidize part of the ferrous ions in the waste water into ferric ions, and control the molar ratio of ferrous ions to ferric ions to be 1:1.9, stop adding hydrogen peroxide;
[0044] (3) add sodium citrate, control the concentration of sodium citrate in the waste water to be 5g / L;
[0045] (4) Add sodium hydroxide, after the pH value of waste water is adjusted to 12, stop adding sodium hydroxide; Add sodium metasilicate afterwards, the addition of sodium metasilicate is 4g / L;
[0046] (5) Continue heating the solution obtained in step (4) to 80° C., keep it warm for 3 hours, and then cool it naturally to room temperature;
[0047] (6) After solid-liquid separation, the obtained solid powder is w...
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