Technology for purifying and reusing beneficiation wastewater of lead-zinc sulfide ore by coupling of hydrodynamic cavitation and H2O2

Abstract

The invention relates to a technology for purifying and reusing beneficiation wastewater of lead-zinc sulfide ore by coupling of hydrodynamic cavitation and H2O2. The technology comprises treatment steps as follows: (1), industrial-grade H2O2 is added to a buffer pool of lead-zinc sulfide ore beneficiation mixed wastewater through a pipeline; (2), the mixed wastewater treated in the step (1) is pumped and elevated from the buffer pool by a centrifugal pump and is conveyed by a conveying pipeline, the conveying pipeline comprises a main pipeline, and a flow meter, a pressure gauge and a hydrodynamic cavitation generation device are connected onto the main pipeline; (3), when the wastewater in the main pipeline passes the hydrodynamic cavitation generation device, pressure of the liquid during passing through a perforated plate is plunged under the flow resisting action of the perforated plate, a large quantity of cavitation bubbles are produced, and degradation of residual chemicals inthe beneficiation wastewater can be accelerated; (4), residual chemicals affecting reuse in the wastewater are purified under the actions of cavitation effect, strong oxidation effect of H2O2 and thecoupling effect; (5), the wastewater treated in the step (4) is totally returned to a beneficiation production system for reuse without influence on beneficiation indexes.

Description

technical field [0001] The invention belongs to the technical field of mine beneficiation wastewater and its reuse method, and relates to a hydraulic cavitation coupling H 2 o 2 Process for purifying lead-zinc sulfide ore beneficiation wastewater. Background technique [0002] Lead and zinc are important non-ferrous metal resources. Our country's lead and zinc resources are mainly sulfide ore. The purification treatment and return water utilization of lead and zinc sulfide mineral processing wastewater can not only eliminate pollution, but also save water resources. It has important economic and environmental benefits. benefit. [0003] As an important link in the lead-zinc production process, lead-zinc beneficiation produces a large amount of lead-zinc beneficiation wastewater while providing raw materials for the lead-zinc industry. Lead-zinc beneficiation wastewater is usually characterized by large quantities and extremely complex components. In addition to heavy meta...

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Problems solved by technology

Patent 201621129235.1 discloses a device for treating wastewater with hydraulic cavitation coupled with the Fenton method. In the process, acid is used to adjust pH, and ferrous ions are required to participate in catalysis; The sewage method is characterized in that an oxidant and a catalyst are added to sewage containing organic pollutants, and the organic pollutants are oxidatively degraded under the effect of cavitation; in the wastewater treatment processes or devices disclosed in the above four patent documents, There is a new impurity SO 4 2- Ions will continue to accumulate during circulation and affect reuse; and acid-base adjustment is required to control PH, especially if the amount of acid is large, the treatment effect is also unstable

Chinese patent 200810139592.X discloses a method for coupling hydraulic cavitation and ozone to treat sewage. This method utilizes the cavitation effect generated by the sewage passing through the cavitation generator and the infiltrated ozone gas flow coupling synergy to degrade the oxygen-consuming substances in the sewage. In order to achieve the purpose of reducing the COD of sewage; large-scale treatment of ozone generators requires a large investment, high ozone production costs, and irritating special odors. It is also necessary to solve the problem of filling ozone into wastewater and the amount of filling, which is difficult to promote and apply in industrialization

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