Treatment system for rare earth carbon precipitation wastewater

Abstract

The utility model provides a treatment system for rare earth carbon precipitation wastewater, which is used for solving the problems of high treatment cost, low resource utilization rate and the like of the existing system. The utility model provides a rare earth carbon precipitation wastewater treatment system which comprises an oil separation precipitation tank (1), a regulating tank (2), a closed oxidation tank (3), an adsorption column (4), a closed calcium removal tank (5) and a stirring heavy metal removal tank (6). Separating and recovering valuable rare earth elements in the carbon precipitation wastewater in the form of bottom mud by using an oil separation precipitation tank; the step-by-step efficient removal of organic matters in the carbon precipitation wastewater is realized by utilizing the oil separation precipitation tank and the closed oxidation tank; and separating calcium, manganese and other heavy metals in the carbon precipitation wastewater by utilizing an adsorption column, a closed calcium removal tank and a stirring heavy metal removal tank, and recovering the manganese in the form of oxide.

Description

TECHNICAL FIELD

[0001] The utility model relates to rare earth industry wastewater advanced treatment and resource field, especially, relate to a kind of rare earth carbon deposition wastewater treatment system. BACKGROUND

[0002] In the production process of the present rare earth industry, a large amount of wastewater containing heavy metals and COD will be generated in the process of carbon deposition, which is commonly known as rare earth carbon deposition wastewater. This type of wastewater contains a variety of heavy metal pollutants and valuable rare earth elements such as Sr, and has a high COD concentration, making it difficult to recycle and meet the discharge standards. The existing carbon deposition wastewater treatment system does not have targeted quality treatment and recovery based on the properties of the wastewater, resulting in high treatment costs and low resource utilization. With the continuous improvement of wastewater treatment requirements in the rare earth industry and the continuous upgrading of emission standards, how to recover rare earth elements from carbon deposition wastewater while ensuring that the effluent meets the standards is a difficult problem facing the rare earth industry. SUMMARY

[0003] The utility model aims at providing a kind of rare earth carbon deposition wastewater treatment system to solve the problems of high treatment cost and low resource utilization of existing system.

[0004] To solve the above problems, the utility model provides a kind of rare earth carbon deposition wastewater treatment system, which comprises an oil separation and sedimentation tank (1), a regulating tank (2), a closed oxidation tank (3), an adsorption column (4), a closed calcium removal tank (5) and a stirring heavy metal removal tank (6). The oil separation and sedimentation tank (1) comprises a water inlet valve (7), a sludge discharge valve A (11) and an oil discharge valve (12). The water outlet pipeline on the upper side of the oil separation and sedimentation tank (1) is connected to the top of the regulating tank (2). The bottom pipeline of the regulating tank (2) is connected to the closed oxidation tank (3) through a lifting pump A (13) and a lifting pump outlet valve A (14). The closed oxidation tank (3) comprises a reagent valve A (16) and a sludge discharge valve B (17). The bottom pipeline of the closed oxidation tank (3) is connected to the top of the closed oxidation tank (3) through a lifting pump A (13) and a lifting pump outlet valve B (18). The bottom pipeline of the closed oxidation tank (3) is connected to the top of the adsorption column (4) through a lifting pump B (19) and a lifting pump outlet valve C (20). The bottom pipeline of the adsorption column (4) is connected to the closed calcium removal tank (5) through a water discharge valve (22). The closed calcium removal tank (5) comprises a reagent valve B (21), a reagent valve C (23) and a sludge discharge valve C (24). The bottom pipeline of the closed calcium removal tank (5) is connected to the top of the stirring heavy metal removal tank (6) through a lifting pump C (25) and a lifting pump outlet valve D (26). The stirring heavy metal removal tank (6) comprises a sludge discharge valve D (29) and a water outlet valve (30).

[0005] Further, the oil separation and sedimentation tank (1) is provided with an inlet baffle (8) and an outlet baffle (9), the inlet baffle (8) is 0.2-0.5m higher than the tank, and the baffle is 0.5-1m away from the tank bottom.

[0006] Further, the oil separation and sedimentation tank (1) is provided with an oil collecting pipe (10), the distance between the oil collecting pipes is 0.5-1m, and the outlet of the oil collecting pipe (10) is connected with an oil discharge valve (12).

[0007] Further, the closed oxidation tank (3) is provided with fillers (15), the distance between the fillers in each layer is 1-1.5m, and the fillers in a single layer are arranged at intervals of 0.2-0.5m.

[0008] Further, the closed oxidation tank (3) is provided with a top cover, the connecting pipeline of the outlet valve B (18) of the lifting pump and the closed oxidation tank (3) has 4-6 water outlets which are uniformly distributed along the section of the closed oxidation tank.

[0009] Further, the adsorption column (4) is located at the upper portion of the closed calcium removal tank (5), and the top of the closed calcium removal tank (5) is sealed.

[0010] Further, the outlet of the medicament valve B (21) of the closed calcium removal tank (5) is 0.5-1m away from the bottom of the calcium removal tank, and the outlet of the medicament valve B (21) is located below the liquid level of the top of the calcium removal tank by 0.2-0.1m.

[0011] Further, the inlet pipeline of the stirring heavy removal tank (6) is connected with the medicament valve D (27) and the jet device (28).

[0012] Further, the stirring heavy removal tank (6) is provided with stirring paddles, and the stirring paddles are 0.5-1.5m away from the bottom of the tank.

[0013] Further, ORP, pH and TDS instruments are arranged in the closed oxidation tank (3), the adsorption column (4), the closed calcium removal tank (5) and the stirring heavy removal tank (6).

[0014] The utility model has the following beneficial effects: according to the characteristics of carbon deposition wastewater, the utility model realizes the separate quality treatment and recovery of COD and heavy metals in carbon deposition wastewater. The valuable rare earth elements in carbon deposition wastewater are separated and recovered in the form of sludge by using the oil separation and sedimentation tank. The organic matters in carbon deposition wastewater are removed in steps and efficiently by using the oil separation and sedimentation tank and the closed oxidation tank. Calcium, manganese and other heavy metals in carbon deposition wastewater are separated, and manganese is recovered in the form of oxide by using the adsorption column, the closed calcium removal tank and the stirring heavy removal tank. The setting of fillers in the closed oxidation tank and the backflow of the lifting pump improves the operation efficiency and eliminates the need for external stirring. The design of the height of the dosing pipeline in the closed calcium removal tank avoids the short flow of medicaments. The setting of the jet device in the pipeline of the stirring heavy removal tank improves the reaction efficiency.

[0015] In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The present application will be described in further detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, and are incorporated in and constitute a part of this application. The embodiments illustrated in the drawings, and their description, serve to explain the present application. They do not limit the present application in any manner. In the drawings:

[0017] Figure 1 is a system schematic diagram of the preferred embodiment of the present application;

[0018] In the figure: 1 - oil separation and sedimentation tank, 2 - adjustment tank, 3 - closed oxidation tank, 4 - adsorption column, 5 - closed calcium removal tank, 6 - stirring and heavy substance removal tank, 7 - water inlet valve, 8 - water inlet baffle, 9 - water outlet baffle, 10 - oil collection pipe, 11 - sludge discharge valve A, 12 - oil discharge valve, 13 - lifting pump A, 14 - lifting pump outlet valve A, 15 - filler, 16 - reagent valve A, 17 - sludge discharge valve B, 18 - lifting pump outlet valve B, 19 - lifting pump B, 20 - lifting pump outlet valve C, 21 - reagent valve B, 22 - water discharge valve, 23 - reagent valve C, 24 - sludge discharge valve C, 25 - lifting pump C, 26 - lifting pump outlet valve D, 27 - reagent valve D, 28 - jet device, 29 - sludge discharge valve D, 30 - water outlet valve DETAILED DESCRIPTION

[0019] The embodiments and examples of the present application will be described in detail below with reference to the drawings, but the present application can be implemented in various different ways limited and covered by the claims.

[0020] As Figure 1 shown, a rare earth carbon-containing waste water treatment system includes an oil separation and sedimentation tank (1), an adjustment tank (2), a closed oxidation tank (3), an adsorption column (4), a closed calcium removal tank (5), and a stirring and heavy substance removal tank (6).

[0021] The oil separation and precipitation tank (1) comprises a water inlet valve (7), a sludge discharge valve A (11) and an oil discharge valve (12). The water outlet pipeline on the upper side of the oil separation and precipitation tank (1) is connected with the top of the adjusting tank (2). The bottom pipeline of the adjusting tank (2) is connected with the closed oxidation tank (3) through the lifting pump A (13) and the lifting pump outlet valve A (14). The closed oxidation tank (3) comprises a reagent valve A (16) and a sludge discharge valve B (17). The bottom pipeline of the closed oxidation tank (3) is connected with the top of the closed oxidation tank (3) through the lifting pump A (13) and the lifting pump outlet valve B (18). The bottom pipeline of the closed oxidation tank (3) is connected with the top of the adsorption column (4) through the lifting pump B (19) and the lifting pump outlet valve C (20). The bottom pipeline of the adsorption column (4) is connected with the closed calcium removal tank (5) through the water discharge valve (22). The closed calcium removal tank (5) comprises a reagent valve B (21), a reagent valve C (23) and a sludge discharge valve C (24). The bottom pipeline of the closed calcium removal tank (5) is connected with the top of the stirring and heavy substance removal tank (6) through the lifting pump C (25) and the lifting pump outlet valve D (26). The stirring and heavy substance removal tank (6) comprises a sludge discharge valve D (29) and a water outlet valve (30). The oil separation and precipitation tank (1) is provided with a water inlet baffle (8) and a water outlet baffle (9). The water inlet baffle (8) is 0.2-0.5m higher than the water inlet, and the distance between the baffle and the bottom of the tank is 0.5-1m. The oil separation and precipitation tank (1) is provided with an oil collecting pipe (10). The distance between the oil collecting pipes is 0.5-1m. The outlet of the oil collecting pipe (10) is connected with the oil discharge valve (12). The closed oxidation tank (3) is provided with a filler (15). The distance between the fillers in each layer is 1-1.5m. The single-layer fillers are arranged at intervals of 0.2-0.5m. The closed oxidation tank (3) is provided with a top cover. The connecting pipeline of the lifting pump outlet valve B (18) and the closed oxidation tank (3) has 4-6 water outlets, which are uniformly distributed along the cross section of the closed oxidation tank. The adsorption column (4) is located on the upper part of the closed calcium removal tank (5). The top of the closed calcium removal tank (5) is sealed. The distance between the outlet of the reagent valve B (21) of the closed calcium removal tank (5) and the bottom of the calcium removal tank is 0.5-1m. The outlet of the reagent valve B (21) is located below the liquid level of the top of the calcium removal tank by 0.2-0.1m. The inlet pipeline of the stirring and heavy substance removal tank (6) is connected with the reagent valve D (27) and the jet device (28). The stirring and heavy substance removal tank (6) is provided with a stirring paddle, and the distance between the stirring paddle and the bottom of the tank is 0.5-1.5m. ORP, pH and TDS instruments are arranged in the closed oxidation tank (3), the adsorption column (4), the closed calcium removal tank (5) and the stirring and heavy substance removal tank (6).

[0022] The operation process is as follows:

[0023] The rare earth carbon precipitation wastewater enters the oil separation and sedimentation tank (1) from the water inlet valve (7), and is buffered by the water inlet baffle (8) to reduce the impact of the water flow, and the rare earth sediment is settled at the bottom of the oil separation and sedimentation tank (1) and discharged from the sludge discharge valve A (11). The impact of the water flow on the sediment is reduced by the water outlet baffle (8), and the sediment is prevented from overflowing from the upper outlet. The oil organic matter in the wastewater enters the oil collection pipe and is discharged from the oil discharge valve (12). The remaining wastewater overflows from the upper outlet of the oil separation and sedimentation tank (1) to the adjusting tank (2).

[0024] The lifting pump A (13) and the lifting pump outlet valve A (14) are opened, the wastewater in the adjusting tank (2) enters the closed oxidation tank (3) from the bottom to the top, the closed oxidation tank (3) is provided with three layers of filler (15), the reagent valve A (16) is opened to add the oxidant, the lifting pump B (19) and the lifting pump outlet valve B (18) are opened to realize the mixing reaction of the reagent and the wastewater, and the sediment is discharged from the sludge discharge valve B (17) after the reaction is completed.

[0025] The lifting pump outlet valve B (18) is closed, the lifting pump outlet valve C (20) is opened, the wastewater enters the adsorption column (4), the drain valve (22) is opened, the wastewater treated by the adsorption column (4) flows into the closed calcium removal tank (5), the reagent valve B (21) and the reagent valve C (23) are opened, and the calcium removal reagents are added, the reagent of the reagent valve B (21) is a gas, and the gas is used to realize the sufficient mixing of the wastewater and the reagent in the closed calcium removal tank (5), and the sediment is discharged from the sludge discharge valve C (24) after the reaction is completed. The wastewater enters the stirring heavy removal tank (6) by opening the lifting pump C (25) and the lifting pump outlet valve D (26).

[0026] The reagent valve D (27) is opened, the reagent is synchronously introduced into the stirring heavy removal tank (6) from the jet (28), the mixing of the wastewater and the reagent is realized under the action of the stirring paddle, the sediment is discharged from the sludge discharge valve D (29) after the reaction is completed, and the water is discharged from the water outlet valve (30).

[0027] Through the above embodiment, the rare earth carbon precipitation wastewater is effectively treated, and the COD and heavy metals in the carbon precipitation wastewater are treated and recovered step by step.

[0028] The above only describes preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A treatment system for rare earth carbon precipitation wastewater, characterized in that: The system includes an oil-water separation sedimentation tank (1), an equalization tank (2), a closed oxidation tank (3), an adsorption column (4), a closed calcium removal tank (5), and a stirred degravimetric tank (6); the oil-water separation sedimentation tank (1) includes an inlet valve (7), a sludge discharge valve A (11), and an oil discharge valve (12). The outlet pipe on the upper side of the oil-water separation sedimentation tank (1) is connected to the top of the equalization tank (2). The bottom pipe of the equalization tank (2) is connected to the closed oxidation tank (3) via a lift pump A (13) and a lift pump outlet valve A (14). The closed oxidation tank (3) includes a reagent valve A (16) and a sludge discharge valve B (17). The bottom pipe of the closed oxidation tank (3) is connected to the closed oxidation tank (3) via a lift pump A (13) and a... The outlet valve B (18) of the booster pump is connected to the top of the closed oxidation tank (3). The bottom pipeline of the closed oxidation tank (3) is connected to the top of the adsorption column (4) via the booster pump B (19) and the booster pump outlet valve C (20). The bottom pipeline of the adsorption column (4) is connected to the closed calcium removal tank (5) via the drain valve (22). The closed calcium removal tank (5) includes the reagent valve B (21), the reagent valve C (23) and the sludge discharge valve C (24). The bottom pipeline of the closed calcium removal tank (5) is connected to the top of the stirred deweighting tank (6) via the booster pump C (25) and the booster pump outlet valve D (26). The stirred deweighting tank (6) includes the sludge discharge valve D (29) and the water outlet valve (30).

2. The rare earth carbon precipitation wastewater treatment system according to claim 1, characterized in that, The oil-water separator sedimentation tank (1) is equipped with an inlet baffle (8) and an outlet baffle (9). The inlet baffle (8) is 0.2-0.5m above the bottom of the tank and is 0.5-1m from the bottom of the tank.

3. The rare earth carbon precipitation wastewater treatment system according to claim 1, characterized in that, The oil-sedimentation tank (1) is equipped with an oil collection pipe (10) with a spacing of 0.5m-1m between the oil collection pipes. The outlet of the oil collection pipe (10) is connected to the oil discharge valve (12).

4. The rare earth carbon precipitation wastewater treatment system according to claim 1, characterized in that, The closed oxidation tank (3) is equipped with packing material (15), with a spacing of 1m-1.5m between each layer of packing material and a single layer of packing material spaced 0.2-0.5m apart.

5. The rare earth carbon precipitation wastewater treatment system according to claim 1, characterized in that, The closed oxidation tank (3) is equipped with a top cover, and the connection pipeline between the lift pump outlet valve B (18) and the closed oxidation tank (3) has 4-6 outlets, which are evenly distributed along the cross-section of the closed oxidation tank.

6. The rare earth carbon precipitation wastewater treatment system according to claim 1, characterized in that, The adsorption column (4) is located above the sealed calcium removal tank (5), and the top of the sealed calcium removal tank (5) is sealed.

7. The rare earth carbon precipitation wastewater treatment system according to claim 1, characterized in that, The outlet of the chemical valve B (21) of the closed calcium removal tank (5) is 0.5-1m from the bottom of the calcium removal tank, and the outlet of the chemical valve B (21) is 0.2-0.1m below the top liquid level of the calcium removal tank.

8. The rare earth carbon precipitation wastewater treatment system according to claim 1, characterized in that, The inlet pipe of the stirring deweight tank (6) is connected to the reagent valve D (27) and the ejector (28).

9. The rare earth carbon precipitation wastewater treatment system according to claim 1, characterized in that, The stirring and degravimetric tank (6) is equipped with a stirring paddle, which is 0.5-1.5m away from the bottom of the tank.

10. The rare earth carbon precipitation wastewater treatment system according to claim 1, characterized in that, The closed oxidation tank (3), adsorption column (4), closed calcium removal tank (5) and stirred degravation tank (6) are all equipped with ORP, pH and TDS meters.

Images