Iron and steel industry nitric acid-hydrofluoric acid mixed acid pickling waste liquid treatment method and system
A nitric acid hydrofluoric acid, industry-leading technology, applied in the direction of metallurgical wastewater treatment, filtration treatment, multi-stage water treatment, etc., can solve the problems of low acid recovery rate, low energy consumption, etc., achieve simple process, long service life, occupying an area The effect of less area
Inactive Publication Date: 2017-03-15
辽宁中成永续水工科技有限公司
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This method has the advantages of low energy consumption, easy selection of equipment and materials, but low recovery rate of acid
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[0027] Attached below Figure 1-4 To further describe the present invention in detail, it should be pointed out that the following examples are intended to facilitate the understanding of the present invention, but do not limit it in any way.
[0028] like Figure 1-3As shown, the application provides a treatment and recovery system for nitric acid hydrofluoric acid mixed acid pickling waste liquid in the iron and steel industry A treatment and recovery system for nitric acid hydrofluoric acid mixed acid pickling waste liquid in the iron and steel industry includes a primary filter unit 1, The reaction unit 2 and the secondary filter unit 3, the waste acid liquid inlet 4 is connected to the filter inlet on the top of the primary filter unit 1 through the pipeline through the water pump 5 and the valve 6, because the mixed acid of nitric acid and hydrofluoric acid is volatile, in order to prevent The mixed acid of nitric acid and hydrofluoric acid volatilizes during the reacti...
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The invention discloses a nitric acid-hydrofluoric acid mixed acid pickling waste liquid treatment and recycling method and system. An acid liquid prepared through a bipolar membrane electrodialysis device is used for pickling a steel material in an iron and steel industry pickling production line so that a raw material cost is saved. An alkali liquor prepared through the bipolar membrane electrodialysis device is used for treating a nitric acid-hydrofluoric acid mixed acid waste liquid. A method of aeration at the bottom of a reaction water tank is used so that the reaction liquids are fully mixed, and enough oxygen is continuously fed into the mixed solution so that reaction time is greatly shortened. A bag-type filter filters the reacted mixed solution and realizes solid-liquid separation of a supernatant and precipitates. After the reaction, nitrate radical and fluoride ions in the nitric acid-hydrofluoric acid mixed acid waste liquid are replaced, Fe<2+> in the nitric acid-hydrofluoric acid mixed acid waste liquid forms precipitates and is separated. The supernatant filtered through the bag-type filter can be returned to the bipolar membrane electrodialysis device and is used for acid and base preparation. The precipitates can be aired and then recovered so that a raw material cost is greatly reduced.
Description
technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a treatment and recovery method and system for nitric acid hydrofluoric acid mixed acid waste liquid in the iron and steel industry. Background technique [0002] The surface of stainless steel and alloy steel in the iron and steel industry produces a layer of oxide during processing, which is usually removed by mixed pickling. At present, manufacturers at home and abroad mostly use nitric acid-hydrofluoric acid mixed pickling to remove oxides. Pickling with mixed acid of nitric acid and hydrofluoric acid has the advantages of fast pickling speed, not easy to over-pickling, and the surface after pickling remains good. These three are beyond the reach of other pickling. After repeated pickling, the metal ions in the pickling liquid increase to a certain concentration, and the acid content drops to a certain percentage, that is, it loses the pickling ability ...
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IPC IPC(8): C02F9/04C23G1/36C02F103/16
CPCC23G1/36C02F9/00C02F2103/16C02F2209/06C02F2301/08C02F1/001C02F1/66C02F1/4693
Inventor 李雨桐邹锦元杨增强张传浩李宁穆冠宁张东晓贾跃武
Owner 辽宁中成永续水工科技有限公司