Recovery device for titanium dioxide in titanium dioxide wastewater

Abstract

The utility model relates to a device for recovering titanium dioxide in titanium dioxide wastewater, which is characterized in that a water outlet at the lower part of a wastewater storage tank is connected into a gas-liquid separator through a wastewater pump via a wastewater pipe, a liquid phase outlet at the bottom of the gas-liquid separator is connected into a CN precision filter, and a discharge pipe at the bottom of the CN precision filter is connected into a recovery tank; a lower outlet of the recovery tank is connected to a hydrolysis process through a recovery pump; an inclined plate is arranged in the middle of the CN precision filter, a grid is arranged at the upper part of the CN precision filter, and a plurality of small filter balls are arranged between the inclined plate and the grid; the lower part of the CN precision filter is connected with a bottom exhaust pipe; the bottom exhaust pipe is connected into an emptying header pipe. Titanium dioxide in the wastewater is adsorbed by the filter balls, and the filter balls are regularly subjected to back flushing, so that the recovery rate of titanium dioxide in the wastewater is remarkably improved, and resource recycling is realized; meanwhile, the influence of residual titanium dioxide on the subsequent process is reduced, the environmental protection pressure is relieved, and the system is simple and convenient to operate, use and maintain.

Description

Technical Field

[0001] This utility model belongs to the field of titanium dioxide production technology, specifically relating to a device for recovering titanium dioxide from titanium dioxide wastewater. Background Technology

[0002] In the production process of titanium dioxide, the washing section includes processes such as primary washing, bleaching, secondary washing, salting, and calcination of seed crystals. Large amounts of hot water are needed to wash the materials, removing impurities such as iron ions and ensuring that the iron ion concentration is controlled within acceptable limits. This washing process generates a large amount of wastewater containing suspended titanium dioxide.

[0003] In existing technologies, useful substances in wastewater, such as titanium dioxide, are discharged with the wastewater without being effectively separated and reused. This results in resource waste and reduces the overall efficiency of resource utilization. Furthermore, it affects the quality of subsequent processes and increases environmental pressure. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a device for recovering titanium dioxide from titanium dioxide wastewater.

[0005] To achieve the above objectives, the technical solution of this utility model is: a device for recovering titanium dioxide from titanium dioxide wastewater, comprising a wastewater storage tank, characterized in that: the outlet at the bottom of the wastewater storage tank is connected to a gas-liquid separator via a wastewater pump and a wastewater pipe, the liquid phase outlet at the bottom of the gas-liquid separator is connected to a CN precision filter, the discharge pipe at the bottom of the CN precision filter is connected to a recovery tank, and the outlet at the bottom of the recovery tank is connected to a hydrolysis process via a recovery pump;

[0006] The CN precision filter has an inclined plate in the middle and a grid at the top, with several filter balls installed between the inclined plate and the grid; the bottom of the CN precision filter is connected to a bottom exhaust pipe, which is connected to the main exhaust pipe.

[0007] The CN precision filter has a first vent pipe and a second vent pipe connected from bottom to top on the inner wall where the filter balls are located. Both the first vent pipe and the second vent pipe are connected to the main vent pipe. The first vent pipe is equipped with a vent control valve.

[0008] The number of filter balls occupies 2 / 3 of the space volume.

[0009] The first vent pipe is connected to a backflush pipe, which is connected to the main compressed air pipe, which is connected to the compressed air storage tank; the backflush pipe is equipped with a backflush control valve.

[0010] Both the wastewater storage tank and the recovery tank are equipped with level gauges, and the discharge pipe is equipped with a discharge valve. The discharge valve and the level gauge are respectively interlocked with the recovery pump for control.

[0011] The CN precision filter is connected to an overflow pipe at the top, which is connected to the waste acid water tank area.

[0012] The gas phase outlet at the top of the gas-liquid separator is connected to the main vent pipe.

[0013] It also includes a flocculant storage tank, the lower outlet of which is connected to a dosing pipe via a delivery pump, and the dosing pipe is connected to a wastewater pipe via a tee.

[0014] The recycling tank is equipped with a stirrer.

[0015] The working principle of CN precision filter: Inclined plates can increase the sedimentation area, making the settling of suspended particles more efficient under the action of gravity, which helps to remove fine particles; the grid is used to intercept larger suspended and floating objects, thereby protecting subsequent treatment equipment from clogging or damage; the inclined plates and the grid work together to achieve effective pretreatment and solid-liquid separation of the fluid inside the CN precision filter for wastewater.

[0016] The beneficial effects of this utility model are as follows: a CN precision filter with a special structure is designed, which adsorbs titanium dioxide in wastewater through filter balls. The filter balls are backflushed regularly, which significantly improves the recovery rate of titanium dioxide in wastewater and realizes resource recycling. At the same time, it also reduces the impact of residual titanium dioxide on subsequent processes, alleviates environmental pressure, and the system is simple, easy to operate, and convenient to use and maintain. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the present invention;

[0018] In the diagram: 1-Wastewater storage tank, 2-Wastewater pump, 3-Gas-liquid separator, 4-CN precision filter, 41-Inclined plate, 42-Grate, 43-Filter balls, 5-Recovery tank, 6-Recovery pump, 7-Flocculant storage tank.

[0019] A - Compressed air main pipe, A1 - Backflush pipe, B - Exhaust main pipe, B1 - First exhaust pipe, B2 - Second exhaust pipe, B3 - Bottom exhaust pipe, L1 - Wastewater pipe, L2 - Discharge pipe, C - Additives pipe, F - Discharge valve, F1 - Exhaust control valve, F2 - Backflush control valve. Detailed Implementation

[0020] See Figure 1A device for recovering titanium dioxide from titanium dioxide wastewater includes a wastewater storage tank 1. The device is characterized in that: the outlet at the bottom of the wastewater storage tank 1 is connected to a gas-liquid separator 3 via a wastewater pump 2 and a wastewater pipe L1; the liquid phase outlet at the bottom of the gas-liquid separator 3 is connected to a CN precision filter 4; the discharge pipe L2 at the bottom of the CN precision filter 4 is connected to a recovery tank 5; a stirrer is installed in the recovery tank 5; and the outlet at the bottom of the recovery tank 5 is connected to a hydrolysis process via a recovery pump 6; the outlet at the bottom of the flocculant storage tank 7 is connected to an additive addition pipe C via a delivery pump; and the additive addition pipe C is connected to the wastewater pipe L1 via a tee.

[0021] The CN precision filter 4 has an inclined plate 41 in the middle and a grid 42 at the top. Several filter balls 43 are installed between the inclined plate 41 and the grid 42. The CN precision filter 4 is connected to the bottom exhaust pipe B3 at the bottom, and the bottom exhaust pipe B3 is connected to the main exhaust pipe B.

[0022] The CN precision filter 4 has a first vent pipe B1 and a second vent pipe B2 connected from bottom to top on the inner wall where the filter balls 43 are located. Both the first vent pipe B1 and the second vent pipe B2 are connected to the main vent pipe B. The first vent pipe B1 is equipped with a vent control valve F1.

[0023] The number of filter balls 43 occupies 2 / 3 of the space volume.

[0024] The first vent pipe B1 is connected to the backflush pipe A1, the backflush pipe A1 is connected to the self-compressed air main pipe A, and the self-compressed air main pipe (A) is connected to the self-compressed air storage tank; the backflush pipe A1 is equipped with a backflush control valve F2.

[0025] Both the wastewater storage tank 1 and the recovery tank 5 are equipped with level gauges, and the discharge pipe L2 is equipped with a discharge valve F. The discharge valve F and the level gauge are respectively interlocked with the recovery pump 6.

[0026] The CN precision filter 4 is connected to an overflow pipe at the top, and the overflow pipe is connected to the waste acid water tank area.

[0027] The gas phase outlet at the top of the gas-liquid separator 3 is connected to the vent manifold B.

[0028] Work process:

[0029] See Figure 1 Wastewater from the outlet of wastewater storage tank 1 is pumped by wastewater pump 2 through wastewater pipe L1 to gas-liquid separator 3. The separated gas phase enters the main vent pipe B, and the liquid phase enters CN precision filter 4. Titanium dioxide in the wastewater of CN precision filter 4 is adsorbed on the surface of filter balls 43. The titanium dioxide solution enters the recovery tank 5 through discharge pipe L2, and is then pumped to the hydrolysis process by recovery pump 6. The clear wastewater from the upper part of CN precision filter 4 is transported to the waste acid water tank area through overflow pipe.

[0030] Adding flocculant to wastewater via dosing pipe C can improve the adsorption of titanium dioxide and increase the yield.

[0031] During normal operation, close the backflush control valve F2 and open the vent control valve F1. The first vent pipe B1 is used for gas venting, and the second vent pipe B2 is normally open for gas venting.

[0032] During periodic backflushing, open the backflushing control valve F2 and close the venting control valve F1. Compressed air enters the CN precision filter 4 from the backflushing pipe A1 through the first venting pipe B1 to backflush the filter balls 43, blowing the titanium dioxide adsorbed on the surface of the filter balls 43 into the solution for recovery.

Claims

1. A device for recovering titanium dioxide from titanium dioxide waste water, comprising a waste water storage tank (1), characterized in that: The wastewater tank (1) lower part of the outlet through the wastewater pump (2) via wastewater pipe (L1) access gas-liquid separator (3), gas-liquid separator (3) bottom liquid phase outlet access CN precision filter (4), CN precision filter (4) bottom discharge pipe (L2) access to the recovery tank (5), recovery tank (5) lower part of the outlet through the recovery pump (6) access to the hydrolysis process; The CN precision filter (4) is provided with an inclined plate (41) in the middle, and a grid (42) is arranged at the upper part, and a plurality of filtering small balls (43) are arranged between the inclined plate (41) and the grid (42); the CN precision filter (4) is connected with a bottom exhaust pipe (B3) at the lower part, and the bottom exhaust pipe (B3) is connected with an exhaust main pipe (B).

2. The device for recovering titanium dioxide from titanium dioxide waste water according to claim 1, characterized in that: The inner wall of the CN precision filter (4) where the filtering small balls (43) are located is connected with a first exhaust pipe (B1) and a second exhaust pipe (B2) from bottom to top, and the first exhaust pipe (B1) and the second exhaust pipe (B2) are connected with the exhaust main pipe (B); the first exhaust pipe (B1) is provided with an exhaust control valve (F1).

3. The device for recovering titanium dioxide from titanium dioxide waste water according to claim 1, characterized in that: The number of the filtering small balls (43) accounts for 2 / 3 of the volume of the space.

4. The device for recovering titanium dioxide from titanium dioxide waste water according to claim 2, characterized in that: The first exhaust pipe (B1) is connected with a back flushing pipe (A1), the back flushing pipe (A1) is connected with a self-pressure air main pipe (A), and the pressure air main pipe (A) is connected with a self-pressure air storage tank. The back flushing pipe (A1) is provided with a back flushing control valve (F2).

5. The device for recovering titanium dioxide from titanium dioxide waste water according to claim 1, characterized in that: The wastewater tank (1) and the recovery tank (5) are both provided with a liquid level meter, and the discharge pipe (L2) is provided with a discharge valve (F), and the discharge valve (F) and the liquid level meter are respectively connected with the recovery pump (6) for interlocking control.

6. The device for recovering titanium dioxide from titanium dioxide waste water according to claim 1, characterized in that: The CN precision filter (4) is connected with an overflow pipe at the upper part, and the overflow pipe is connected with a waste acid tank area.

7. The device for recovering titanium dioxide from titanium dioxide waste water according to claim 1, characterized in that: The gas phase outlet of the gas-liquid separator (3) is connected with the exhaust main pipe (B).

8. The device for recovering titanium dioxide from titanium dioxide waste water according to claim 1, characterized in that: A flocculant tank (7) is further included, and the flocculant tank (7) is connected with an additive pipe (C) through a delivery pump at the lower part, and the additive pipe (C) is connected with the wastewater pipe (L1) through a three-way pipe.

9. The device for recovering titanium dioxide from titanium dioxide waste water according to claim 1, characterized in that: The recovery tank (5) is provided with a stirrer.

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