Method for treating pickling wastewater and recovering byproducts through reduced pressure and low temperature catalytic fractionation
A technology of pickling wastewater and low-temperature catalysis, which is applied in the fields of metallurgical wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. The effect of environmental pollution and high utilization rate
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[0027] The present invention will be further described below in conjunction with the accompanying drawings and examples, but no limitation is made hereto.
[0028] As shown in Fig. 1, the process of the present invention includes preparation (catalyst mixing), low-pressure fractionation, solid-liquid separation, metal salt separation, catalyst concentration, regenerated acid absorption, catalyst reflux and other operations.
[0029] The technical process of the present invention is to fully mix the multi-effect catalyst with the pickling waste liquid at a concentration of 35% to 48% and pour it into a low-pressure fractionator, and the mixed liquid is injected into a high-efficiency heat exchanger from the bottom of the low-pressure fractionator by an acid-resistant pump for forced circulation heating , the heated mixed liquid is sprayed from the top of the high-efficiency heat exchanger into the low-pressure fractionator, and the gas enters the condensing heat exchanger under ...
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