Acid-containing sewage treatment device for lead-zinc smelting

Abstract

The utility model relates to the technical field of acid-containing sewage treatment, in particular to a lead-zinc smelting acid-containing sewage treatment device, which comprises an acid-containing sewage tank, a neutralizing tank, a sedimentation tank, a vulcanization tank, a thickening tank, an oxidation tank, an adsorption tank and a clean water tank, a bottom outlet of the acid-containing sewage tank is fixedly communicated with the neutralizing tank, and the bottom of the neutralizing tank is fixedly communicated with the sedimentation tank. The bottom of the sedimentation tank is fixedly communicated with a vulcanization tank, the bottom of the vulcanization tank is provided with a thickening tank, the bottom of the thickening tank is fixedly communicated with an oxidation tank, the bottom of the oxidation tank is fixedly communicated with an adsorption tank, and the bottom of the adsorption tank is fixedly communicated with a clean water tank; according to the acid-containing sewage treatment device, the neutralization tank, the sedimentation tank, the oxidation tank, the adsorption tank and the like are arranged to carry out neutralization, sedimentation, filtration reaction, adsorption and the like on acid-containing sewage, precipitates are separated out firstly in the treatment process and then are treated, so that the problem that the sewage treatment effect is poor due to the fact that the precipitates exist in the sewage all the time is solved; the acid-containing sewage treatment device is simple in structure, high in treatment efficiency and wide in application range.

Description

TECHNICAL FIELD

[0001] The utility model relates to acid-containing sewage treatment technical field especially relates to a lead and zinc smelting acid-containing sewage treatment device. BACKGROUND

[0002] The wastewater produced by non-ferrous metal smelting is mainly flue gas purification wastewater, which is formed by the volatilization of toxic and harmful element compounds in the high-temperature sintering or smelting process and the enrichment in the flue dust, and then enters the flue gas purification wastewater in the flue gas pickling process. The flue gas purification wastewater is commonly known as waste acid, which accounts for about 20%-30% of the total amount of wastewater of lead and zinc smelting enterprises. Due to the factors such as the high number of flue gas purification dilute acid recycling, the toxic and harmful concentration in the flue gas purification wastewater of lead and zinc smelting enterprises is high, and 80% of the toxic elements in lead and zinc smelting are discharged into the external environment through waste acid treatment. The main treatment technologies for toxic wastewater include oxidation method, precipitation method, and adsorption method. The oxidation method is suitable for pretreatment, the precipitation method is relatively mature and has a wide range of applications, and the adsorption method has a high cost and is suitable for deep treatment of wastewater. At present, the wastewater treatment process of lead and zinc smelting in China is mainly the precipitation method, but the pollutants removed by the precipitation method are mainly lead, cadmium, arsenic, and other pollutants in the wastewater, and the discharge standards of these pollutants require the wastewater discharge standards issued by the state and local governments, which causes great pollution to the environment, soil, and groundwater, and needs to be urgently curbed. CONTENT

[0003] The lead and zinc smelting acid-containing sewage treatment device provided by the utility model overcomes the above-mentioned deficiencies of the prior art, and effectively solves the problem of poor sewage treatment effect caused by the use of the precipitation device for precipitation treatment in the existing acid-containing sewage treatment.

[0004] To solve the above problems, the lead and zinc smelting acid-containing sewage treatment device provided by the utility model comprises an acid-containing sewage pool, a neutralization tank, a sedimentation tank, a sulfidation tank, a thickening tank, an oxidation tank, an adsorption pool, and a clean water pool. The bottom outlet of the acid-containing sewage pool is fixedly connected with the neutralization tank, the bottom of the neutralization tank is fixedly connected with the sedimentation tank, the bottom of the sedimentation tank is fixedly connected with the sulfidation tank, the bottom of the sulfidation tank is provided with the thickening tank, the bottom of the thickening tank is fixedly connected with the oxidation tank, the bottom of the oxidation tank is fixedly connected with the adsorption pool, and the bottom of the adsorption pool is fixedly connected with the clean water pool. A filter press device is arranged above the sedimentation tank, a screw sludge conveyor is arranged at the bottom of the sedimentation tank, a sludge hole penetrating through the inside and outside of the sedimentation tank is arranged on the side wall of the sedimentation tank at one end of the screw sludge conveyor, a sludge conveying motor is connected to the outside of the sedimentation tank after the other end of the screw sludge conveyor extends to the outside of the sedimentation tank, a sedimentation plate is arranged in the sedimentation tank between the screw sludge conveyor and the filter press device, and one side of the sedimentation tank at the bottom and above the sedimentation plate is fixedly connected with the sulfidation tank. A filter is fixedly connected to the outside of the lower part of the oxidation tank, and the outlet end of the filter is fixedly connected with the adsorption pool.

[0005] The sewage pump is further arranged, and the outlet of the sewage pump is fixedly connected with the acid-containing sewage pool.

[0006] The acid-containing sewage tank is fixedly connected with a neutralizing tank, a sedimentation tank, a sulfidation tank, a thickening tank, an oxidation tank and an adsorption tank.

[0007] The oxidation tank is fixedly connected with a delivery pipeline at the outside of the lower part, and the other end of the delivery pipeline is fixedly connected with a filter, and a second control valve is fixedly installed on the delivery pipeline.

[0008] The clean water tank is fixedly connected with a liquid outlet pipe at the outside of the lower part, and a third control valve is installed on the liquid outlet pipe.

[0009] The acid-containing sewage is neutralized, precipitated, filtered and adsorbed by the neutralizing tank, the sedimentation tank, the oxidation tank and the adsorption tank, and the sedimentation is separated first, and then the sewage is treated, so that the problem of poor sewage treatment effect caused by the existence of the sedimentation in the sewage is avoided, the treatment efficiency of the acid-containing sewage is improved, the structure is simple, the treatment efficiency is high, and the application range is wide. BRIEF DESCRIPTION OF DRAWINGS

[0010] The specific embodiments of the utility model will be further described in detail below with reference to the drawings.

[0011] Figure 1 The utility model discloses a structure schematic view.

[0012] In the drawing: 1-acid-containing sewage tank, 2-neutralizing tank, 3-sedimentation tank, 4-sulfidation tank, 5-thickening tank, 6-oxidation tank, 7-adsorption tank, 8-clean water tank, 9-filter pressing device, 10-spiral sludge delivery device, 11-sludge hole, 12-sludge delivery motor, 13-sedimentation plate, 14-filter, 15-sewage pump, 16-first control valve, 17-delivery pump, 18-second control valve, 19-liquid outlet pipe, 20-third control valve. DETAILED DESCRIPTION

[0013] The utility model is not limited by the following embodiments, and the specific embodiments can be determined according to the technical scheme and actual situation of the utility model.

[0014] The utility model will be further described below in combination with the embodiments and drawings:

[0015] For example, Figure 1As shown, a kind of lead-zinc smelting acid-containing sewage treatment device, including acid-containing sewage pool 1, neutralization tank 2, sedimentation tank 3, sulfurization tank 4, thickening tank 5, oxidation tank 6, adsorption pool 7 and clean water pool 8, the bottom outlet of acid-containing sewage pool 1 is fixedly connected with neutralization tank 2, the bottom of neutralization tank 2 is fixedly connected with sedimentation tank 3, the bottom of sedimentation tank 3 is fixedly connected with sulfurization tank 4, the bottom of sulfurization tank 4 is provided with thickening tank 5, the bottom of thickening tank 5 is fixedly connected with oxidation tank 6, the bottom of oxidation tank 6 is fixedly connected with adsorption pool 7, the bottom of adsorption pool 7 is fixedly connected with clean water pool 8;Pressure filter device 9 is arranged above sedimentation tank 3, screw sludge feeder 10 is arranged at the bottom of sedimentation tank 3, sludge hole 11 is arranged on the side wall of sedimentation tank 3 at the position of one end of screw sludge feeder 10, sludge feeder motor 12 is connected after screw sludge feeder 10 extends to the outside of sedimentation tank 3, sedimentation plate 13 is arranged in sedimentation tank 3 between screw sludge feeder 10 and pressure filter device 9, one side of sedimentation tank 3 at the bottom and above sedimentation plate 13 is fixedly connected with sulfurization tank 4;Filter 14 is fixedly connected with adsorption pool 7 at the outlet end of filter 14.

[0016] Wherein, the inner cavity of sulfurization tank 4 is designed in wave shape, to prevent turbulent flow during mixing of sodium sulfide, and to make liquid mixing more uniform at a faster speed;The adsorbent in adsorption pool 7 is irregular column pile, which can better filter harmful substances in liquid;Filter 14 is designed in drawer type, when adsorption material is saturated, clogging is serious, and filter speed is reduced, filter screen can be replaced.

[0017] When working, waste acid liquid generated in non-ferrous metal smelting process is collected in acid-containing sewage pool 1, acid-containing sewage in acid-containing sewage pool 1 flows into neutralization tank 2, after adding lime milk at the top of neutralization tank 2 and stirring, PH of acid-containing sewage is adjusted, and then it is transported to pressure filter device 9 for sludge dewatering, after pressure filtration, sludge sinks to the bottom of sedimentation tank 3, and liquid enters sulfurization tank 4, while sludge is discharged from sludge hole 11 under the action of screw sludge feeder 10 driven by sludge feeder motor 12, after liquid enters sulfurization tank 4, sodium sulfide is added at one side of the top of sulfurization tank 4, sodium sulfide reacts with liquid, reacted liquid enters thickening tank 5, after sedimentation separation in thickening tank 5, it is pumped into oxidation tank 6, after adding oxidizing agent and PAM in oxidation tank 6, it is filtered in filter 14, after filtering in filter 14, it is treated in adsorption pool 7, after adsorption treatment, clean liquid enters clean water pool 8, after purification treatment in the whole process, the content of toxic and harmful substances in purified liquid is less than 0.03 mg / L.

[0018] In conclusion, the acid-containing sewage is treated by neutralization, precipitation, filtration reaction and adsorption through the neutralization tank 2, the sedimentation tank 3, the oxidation tank 6 and the adsorption tank 7, the sedimentation is separated out first, and then the treatment is carried out, the problem of poor sewage treatment effect caused by the existence of the sediment in the sewage is avoided, the treatment efficiency of the acid-containing sewage is improved, the structure is simple, the treatment efficiency is high, and the application range is wide.

[0019] As shown in Figure 1 , it further comprises a sewage pump 15, and the outlet of the sewage pump 15 is fixedly communicated with the acid-containing sewage tank. Therefore, the sewage pump 15 is used for pumping the waste liquid of acid sewage generated in the non-ferrous metal smelting process into the acid-containing sewage tank 1 for collection.

[0020] As shown in Figure 1 , it further comprises a first control valve 16 and a delivery pump 17, and the lower outer side of the acid-containing sewage tank 1 is fixedly communicated with a liquid delivery pipeline, the other end of the liquid delivery pipeline is fixedly communicated with the neutralization tank 2, the first control valve 16 is installed on the liquid delivery pipeline, the delivery pump 17 is arranged at the inner bottom of the neutralization tank 2, and the outlet of the delivery pump 17 is fixedly communicated with the sedimentation tank 3. Therefore, the first control valve 16 controls the amount of acid-containing sewage entering the neutralization tank 2, and the delivery pump 17 is used for delivering the neutralized liquid in the neutralization tank 2 to the sedimentation tank 3.

[0021] As shown in Figure 1 , the lower outer side of the oxidation tank 6 is fixedly communicated with a delivery pipeline, the other end of the delivery pipeline is fixedly communicated with the filter 14, and the second control valve 18 is fixedly installed on the delivery pipeline. Therefore, the second control valve 18 is used for controlling the amount of liquid in the oxidation tank 6 entering the filter 14, so as to avoid too much liquid in the filter 14 and affect the filtration effect.

[0022] As shown in Figure 1 , the lower outer side of the clean water tank 8 is fixedly communicated with a liquid outlet pipe 19, and the third control valve 20 is installed on the liquid outlet pipe 19. Therefore, by opening the third control valve 20, the liquid in the clean water tank 8 can be discharged.

Claims

1. A lead-zinc smelting acid-containing wastewater treatment device, characterized in that, The acid-containing sewage tank is fixedly connected with the neutralizing tank at the bottom outlet, the neutralizing tank is fixedly connected with the sedimentation tank at the bottom, the sedimentation tank is fixedly connected with the sulfidation tank at the bottom, the sulfidation tank is provided with the thickening tank at the bottom, the thickening tank is fixedly connected with the oxidation tank at the bottom, the oxidation tank is fixedly connected with the adsorption tank at the bottom, and the adsorption tank is fixedly connected with the clean water tank at the bottom.

2. The device for treating acid-containing wastewater from lead-zinc smelting according to claim 1, characterized in that, The sewage pump is further included, and the outlet of the sewage pump is fixedly connected with the acid-containing sewage tank.

3. The device for treating acid-containing wastewater from lead-zinc smelting according to claim 1, characterized in that, The first control valve and the delivery pump are further included, the acid-containing sewage tank is fixedly connected with the liquid delivery pipeline at the lower outer side, the other end of the liquid delivery pipeline is fixedly connected with the neutralizing tank, the first control valve is installed on the liquid delivery pipeline, the delivery pump is arranged at the bottom inner side of the neutralizing tank, and the outlet of the delivery pump is fixedly connected with the sedimentation tank.

4. The device for treating acid-containing wastewater from lead-zinc smelting according to claim 1, characterized in that, The delivery pipeline is fixedly connected with the filter at the lower outer side of the oxidation tank, the other end of the delivery pipeline is fixedly connected with the filter, and the second control valve is fixedly installed on the delivery pipeline.

5. The device for treating acid-containing wastewater from lead-zinc smelting according to claim 1, characterized in that, The liquid outlet pipe is fixedly connected with the clean water tank at the lower outer side, and the third control valve is installed on the liquid outlet pipe.

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