Treatment method of arsenium-containing polluted acid wastewater generated by smelting flue gas
A technology of polluted acid wastewater and smelting flue gas, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of high investment, complicated process and waste of resources, etc. The effect of good treatment effect, simple operation and low consumption
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[0015] Example 1: The composition of the acid sample liquid from a smelter is shown in Table 1:
[0016] Table 1 Water sample composition
[0017]
[0018] Take 1L of this dirty acid for pretreatment to remove sulfate, add 144.2g of anhydrous calcium chloride, stir at 600r / min, and react for 20min. While continuing to stir, add flocculant PAM2.5mg, and stir at medium speed of 120r / min for 4.5 min, stirring at a slow speed of 30r / min for 10min, standing for 20min, and then performing solid-liquid separation; the filter residue is mainly calcium sulfate with an arsenic content of less than 0.1%, which is not a hazardous waste, and the sulfate removal rate is 65.50%; the filtrate enters pre-neutralization , Slowly add lime to neutralize to pH=0.5, stir at 600r / min, and react for 10min. While continuing to stir, add flocculant PAM1.5mg, medium speed 120r / min for 4.5min, slow speed 30r / min for 10min, Let stand for 20 minutes, the filter residue is mainly calcium sulfate, the content of...
Example Embodiment
[0019] Example 2: The composition of the acid sample liquid from a smelter is shown in Table 2:
[0020] Table 2 Water sample composition
[0021]
[0022] Take 1L of this dirty acid for pretreatment to remove sulfate, add the filtrate after three neutralization and removal of arsenic in Example 1, stirring at 600r / min, for 40min to react, while continuing to stir, add 0.6mg of flocculant PAM, medium speed 120r Stirring for 4.5min at 30r / min, stirring at a slow speed of 30r / min for 10min, standing for 20min, and then performing solid-liquid separation; the filter residue is mainly calcium sulfate with an arsenic content of less than 0.1%, which is not a hazardous waste, and the sulfate removal rate is 66.31%; filtrate Enter pre-neutralization, slowly add lime to neutralize to pH=1, stirring speed 600r / min, time 10min for reaction, while continuing to stir, add flocculant PAM2.0mg, medium speed 120r / min stirring 4.5min, slow speed 30r / Min stirring for 10 minutes, standing for 20 m...
Example Embodiment
[0023] Example 3: The composition of the acid sample liquid from a smelter is shown in Table 3:
[0024] Table 3 Water sample composition
[0025]
[0026] Take 1L of this dirty acid for pretreatment to remove sulfate, add 201.9g of anhydrous calcium chloride, stir at 600r / min, and react for 60min. While continuing to stir, add flocculant PAM1.5mg, and stir at a medium speed of 120r / min for 4.5 min, stirring at a slow speed of 30r / min for 10 min, standing for 20 min, and then performing solid-liquid separation; the filter residue is mainly calcium sulfate with an arsenic content of less than 0.1%, which is not a hazardous waste, and the sulfate removal rate is 78.23%; the filtrate enters the pre-neutralization , Slowly add lime to neutralize to pH=1, the stirring speed is 600r / min, the reaction time is 30min, while continuing to stir, add the flocculant PAM 0.6mg, the medium speed 120r / min stirs for 4.5min, the slow speed 30r / min stirs for 10min, Let stand for 20 minutes, the filt...
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