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Treatment method of fluoride-ion-containing sulfate trivalent chromium plating wastewater
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A treatment method and technology of trivalent chromium, which are applied in the fields of metallurgical wastewater treatment, water/sewage treatment, neutralization water/sewage treatment, etc., can solve the problems of electroplating wastewater failing to meet the standard, and achieve good market application prospects, simple process, low cost effect of dosage
Active Publication Date: 2020-01-03
GUANGZHOU ULTRA UNION CHEM LTD
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[0005] Based on this, it is necessary to provide a treatment method for sulfate trivalent chromium plating wastewater containing fluorine ions, so that the complexing agent and trivalent chromium in the treated trivalent chromium chromium plating wastewater can be effectively treated, and solve the existing problems. Difficulties in treating the electroplating wastewater that cannot meet the standard
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Embodiment 1
[0047] The present embodiment provides a kind of treatment method of sulfate trivalent chromium plating waste water, handles the trivalent chromium plating waste water containing trivalent chromium ion 300mg / L, citric acid 400mg / L, fluorideion 20mg / L, comprises the following steps:
[0049] The sulfate trivalent chromium plating wastewater containing fluorine ions is imported from the wastewater regulating tank to the sedimentation tank A, and under mechanical stirring, 25L of heavy metalscavenger A is added to each ton of wastewater, and the pH of the wastewater is adjusted to 10 by adding limeemulsion. ~12, trivalent chromium ions, citrate and fluoride ions generate precipitates.
[0061] The present embodiment provides a kind of treatment method of sulfate trivalent chromium-plating waste water, handles the trivalent chromium-plating waste water containing trivalent chromium ion 220mg / L, malic acid 500mg / L, fluorine ion 20mg / L, comprises the following steps:
[0063] The sulfate trivalent chromium plating wastewater containing fluorine ions is imported from the wastewater regulating tank to the sedimentation tank A, and under mechanical stirring, 30L of heavy metal scavenger B is added to each ton of wastewater, and limeemulsion is added to adjust the pH of the wastewater to 10 ~12, trivalent chromium ions, malate and fluoride ions generate precipitates.
[0065] Wastewater flows from sedimentation tank A into sedimentation tank B. Under mechanical stirring, 15L of ferrous chloride solution is added to each ton of wastewater, and lime emulsion is added to keep the pH of the...
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Abstract
The invention provides a treatment method of fluoride-ion-containing sulfate trivalent chromium plating wastewater. By means of a synergistic effect of a heavy metal chelate agent, ferrous ions and calcium ions, under an alkaline condition, trivalent chromium ions are precipitated with a dimethyldithiocarbamic acid sodium salt or sodium diethyldithiocarbamatre, citric acid or malic acid is precipitated with the ferrous ions and the calcium ions, and fluoride ions are precipitated with the calcium ions, so that trivalent chromium and a complexing agent of the trivalent chromium are effectivelyremoved. Organic additives in the wastewater are destroyed by a sodiumhypochlorite solution, so that COD of the wastewater is reduced. Therefore, treated trivalent chromium plating wastewater meets the requirements of electroplatingpollutantdischarge standard.
Description
technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to a treatment method for sulfate trivalent chromium plating wastewater containing fluorine ions. Background technique [0002] Trivalent chromium plating has been put into large-scale production for a short period of time, and there are still some problems to be solved in the treatment of its wastewater. [0003] Sulfate trivalent chromium plating wastewater contains citric acid or malic acid. Citric acid has strong oxidizing properties. The efficiency of destroying citric acid by traditional oxidation methods is low. Generally, it is necessary to add a large amount of oxidant to destroy citric acid. The treatment cost is very high. It is also difficult to effectively remove citric acid in winter. Tests have shown that chromium salt raw materials used in trivalent chromium plating (such as liquid chromium sulfate, etc.) often contain fluorine im...
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