Method for removing heavy metal in rare earth extraction waste water
An extraction and wastewater technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of high price of sodium sulfide or recapture agent, difficulty in treatment and recovery of heavy metals, excessive heavy metal elements, etc. In large-scale production, stable treatment effect, and the effect of reducing process cost
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[0025] Example 1:
[0026] A method for removing heavy metals in rare earth extraction wastewater of the present invention includes the following steps:
[0027] (1) Add precipitant sodium hydroxide to 20L rare earth extraction wastewater for pretreatment, press filter to remove residue after pretreatment, and the waste liquid enters the reaction tank for subsequent treatment, and the pH value of the resulting waste liquid is 10;
[0028] (2) Add polyaluminum chloride, a coagulant aid, to the waste liquid after step (1). The amount of coagulant aid added is 100 mg / m based on the volume of the waste liquid. 3 , And then put the waste liquid together with the coagulant aid into the reaction chamber of the electro-flocculation reactor with a peristaltic pump, start the electro-flocculation reactor for flocculation treatment, the current density is 150A / m 2 After the flocculation treatment is completed, the adsorbent polyacrylamide is first added to the water outlet of the electro-floccul...
Example Embodiment
[0033] Example 2:
[0034] A method for removing heavy metals in rare earth extraction wastewater of the present invention includes the following steps:
[0035] (1) Add precipitant quicklime to 20L rare earth extraction wastewater for pretreatment, press filter to remove residue after pretreatment, and the waste liquid enters the reaction tank for subsequent treatment, and the pH value of the resulting waste liquid is 9.5;
[0036] (2) Add coagulant aid aluminum sulfate to the waste liquid after step (1), and the amount of coagulant aid added is 50 mg / m based on the volume of the waste liquid 3 , And then put the waste liquid together with the coagulant aid into the reaction chamber of the electro-flocculation reactor with a peristaltic pump, start the electro-flocculation reactor for flocculation treatment, the current density is 100A / m 2 After the flocculation treatment is completed, the adsorbent polyacrylamide is added to the water outlet of the electro-flocculation reactor, and ...
Example Embodiment
[0039] Example 3:
[0040] A method for removing heavy metals in rare earth extraction wastewater of the present invention includes the following steps:
[0041] (1) Add precipitant lime to 20L rare earth extraction wastewater for pretreatment, press filter to remove residue after pretreatment, and the waste liquid enters the reaction tank for subsequent treatment, and the pH value of the resulting waste liquid is 9.5;
[0042] (2) Add coagulant aid aluminum sulfate to the waste liquid after step (1), and the amount of coagulant aid added is 50 mg / m based on the volume of the waste liquid 3 , And then put the waste liquid together with the coagulant aid into the reaction chamber of the electro-flocculation reactor with a peristaltic pump, start the electro-flocculation reactor for flocculation treatment, the current density is 150A / m 2 After the flocculation treatment is completed, the adsorbent polyacrylamide is added to the water outlet of the electro-flocculation reactor, and then ...
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