Efficient filtering system for producing titanium dioxide by sulfuric acid method

Abstract

The utility model relates to a high-efficiency filtering system for producing titanium dioxide by a sulfuric acid method. The high-efficiency filtering system is characterized in that a production water pipe and a crystallized titanium liquid pipe are arranged above a disc filter; a first washing liquid outlet pipe of a first washing area of the disc filter is connected to a first gas-liquid separator, a liquid outlet pipe of the first gas-liquid separator is connected to a first section of liquid seal tank, and qualified titanium liquid is used for a concentration process; a second washing liquid outlet pipe of the second washing area is connected to a second gas-liquid separator, a liquid outlet pipe of the second gas-liquid separator is connected to a second-section liquid seal tank, and dilute titanium liquid returns to the first washing area of the disc filter; a third washing liquid outlet pipe of the third washing area is connected to a third gas-liquid separator, a liquid outlet pipe of the third gas-liquid separator is connected to a third section of liquid seal tank, and dilute titanium liquid returns to the second washing area of the disc filter. The disc filter is adopted, a vacuum system of the disc filter is good in sealing performance, filter cloth of the filter is not prone to being blocked through back flushing, the filtering effect is stable, the system is compact in overall structure and small in occupied space, and the automation control degree is improved.

Description

Technical Field

[0001] This utility model belongs to the field of titanium dioxide production technology, specifically relating to a high-efficiency filtration system for the production of titanium dioxide using the sulfuric acid process. Background Technology

[0002] In the production process of titanium dioxide, the freeze crystallization section includes processes such as black slag filtration, freeze crystallization, and ferrous sulfate separation. The main function of the ferrous sulfate separation process is to separate ferrous sulfate from the titanium liquid through filtration, thereby purifying the titanium liquid. Existing filtration technologies generally use belt filters. This process has the following problems: first, its vacuum system is prone to negative pressure leakage, leading to unstable filtration results; second, the filter cloth is easily damaged, affecting filtration efficiency and increasing maintenance costs; and third, it requires a large footprint, resulting in a relatively small effective filtration area, thus affecting production efficiency. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high-efficiency filtration system for the production of titanium dioxide using the sulfuric acid process.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a high-efficiency filtration system for the production of titanium dioxide using the sulfuric acid process, comprising a disc filter, which is provided with a cloth feeding area, a first washing area, a second washing area, a third washing area, a discharge area, and a filter cloth regeneration area. The disc filter is characterized in that a production water pipe and a crystallizing titanium liquid pipe are provided above the disc filter.

[0005] The bottom outlet of the first washing zone is connected to a washing liquid outlet pipe, which is connected to the first gas-liquid separator. The first liquid outlet pipe at the bottom of the first gas-liquid separator is connected to a liquid seal tank. The qualified titanium liquid output pipe at the bottom of the liquid seal tank is connected to the filtered titanium liquid tank through the first pump for use in the concentration process.

[0006] The bottom outlet of the second washing zone is connected to the second washing liquid outlet pipe, which is connected to the second gas-liquid separator. The second liquid outlet pipe at the bottom of the second gas-liquid separator is connected to the second-stage liquid seal tank. The dilute titanium liquid output pipe at the bottom of the second-stage liquid seal tank is returned to the first washing zone connected to the disc filter through the second pump.

[0007] The bottom outlet of the three washing zone is connected to the three washing liquid outlet pipe, which is connected to the No. 3 gas-liquid separator. The No. 3 liquid outlet pipe at the bottom of the No. 3 gas-liquid separator is connected to the three-section liquid seal tank. The dilute titanium liquid output pipe at the bottom of the three-section liquid seal tank is returned to the second washing zone connected to the disc filter through the No. 3 pump.

[0008] A screw feeder is installed on the unloading area, and a ferrous chute is installed at the outlet of the screw feeder. An air hammer is installed on the outer wall of the ferrous chute to prevent material from sticking to the wall.

[0009] The bottom backflush port of the filter cloth regeneration zone is connected to a backflush pipe, which is connected to a self-compressed air buffer tank.

[0010] The dilute titanium liquid output pipe at the bottom of the three-section liquid seal tank is also connected to the inlet of pump No. 4, and the outlet of pump No. 4 is connected to a small water tank after filtration for acid hydrolysis.

[0011] The exhaust pipes at the top of the No. 1, No. 2, and No. 3 gas-liquid separators are respectively connected to the exhaust manifold, which is connected to the vacuum buffer tank. The gas in the vacuum buffer tank is extracted by a vacuum pump to facilitate the complete discharge of liquid from the gas-liquid separator. The drain port at the bottom of the vacuum buffer tank is connected to a three-section liquid seal tank.

[0012] The No. 3, No. 2, and No. 1 outlet pipes are also connected to cleaning water discharge branch pipes. The cleaning water discharge branch pipes are equipped with manual control valves and are connected to the wastewater main pipe, which is connected to the drainage ditch.

[0013] The first liquid seal tank is equipped with a No. 1 level gauge that is interlocked with the No. 1 pump; the second liquid seal tank is equipped with a No. 2 level gauge that is interlocked with the No. 2 pump; and the third liquid seal tank is equipped with a No. 3 level gauge that is interlocked with the No. 3 and No. 4 pumps. The No. 2 pump is equipped with a pressure gauge that facilitates constant pressure control.

[0014] The first washing zone has two outlets at the bottom, each connected to a first washing liquid outlet branch pipe, and the first washing liquid outlet branch pipe is connected to a first washing liquid outlet pipe; the third washing zone has two outlets at the bottom, each connected to a third washing liquid outlet branch pipe, and the third washing liquid outlet branch pipe is connected to a third washing liquid outlet pipe.

[0015] The beneficial effects of this utility model are as follows: the use of a disc filter has good vacuum system sealing performance, which can provide a more stable vacuum environment. Backflushing makes the filter cloth less prone to clogging, increases the filtration area, stabilizes the filtration effect, and reduces maintenance costs. An air hammer is installed on the ferrous chute to prevent material from sticking to the wall. The overall system structure is compact, occupies less space, improves the degree of automation control, reduces manual intervention, and improves product quality and yield. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the present invention;

[0017] In the diagram: A - Disc filter, a1 - First wash outlet pipe, a2 - Second wash outlet pipe, a3 - Third wash outlet pipe, B1 - First gas-liquid separator, B2 - Second gas-liquid separator, B3 - Third gas-liquid separator, b1 - First outlet pipe, b2 - Second outlet pipe, b3 - Third outlet pipe, C1 - First stage liquid seal tank, C2 - Second stage liquid seal tank, C3 - Third stage liquid seal tank, D - Main exhaust pipe, E - Main wastewater pipe, P1 - First pump, P2 - Second pump, P3 - Third pump, P4 - Fourth pump, L1 - First level gauge, L2 - Second level gauge, L3 - Third level gauge, 1 - Screw feeder, 2 - Ferrous iron chute, 3 - Air hammer, 4 - Production water pipe, 5 - Crystallized titanium liquid pipe, 6 - Backflush pipe, 7 - Compressed air buffer tank, 8 - Vacuum buffer tank. Detailed Implementation

[0018] See Figure 1 A high-efficiency filtration system for the production of titanium dioxide using the sulfuric acid process includes a disc filter A, which is provided with a cloth feeding area, a first washing area, a second washing area, a third washing area, a discharge area, and a filter cloth regeneration area. The disc filter A is characterized in that a production water pipe 4 and a crystallizing titanium liquid pipe 5 are provided above the disc filter A.

[0019] The bottom outlet of the first washing zone is connected to a washing liquid outlet pipe a1, the washing liquid outlet pipe a1 is connected to the first gas-liquid separator B1, the first liquid outlet pipe b1 at the bottom of the first gas-liquid separator B1 is connected to a section of liquid seal tank C1, and the qualified titanium liquid output pipe at the bottom of the section of liquid seal tank C1 is connected to the filtered titanium liquid tank through the first pump P1 for use in the concentration process.

[0020] The bottom outlet of the second washing zone is connected to the second washing liquid outlet pipe a2, the second washing liquid outlet pipe a2 is connected to the second gas-liquid separator B2, the second liquid outlet pipe b2 at the bottom of the second gas-liquid separator B2 is connected to the second liquid seal tank C2, and the dilute titanium liquid output pipe at the bottom of the second liquid seal tank C2 is returned to the first washing zone connected to the disc filter A through the second pump P2.

[0021] The bottom outlet of the three washing zone is connected to the three washing liquid outlet pipe a3, the three washing liquid outlet pipe a3 is connected to the No. 3 gas-liquid separator B3, the No. 3 liquid outlet pipe b3 at the bottom of the No. 3 gas-liquid separator B3 is connected to the three-section liquid seal tank C3, and the dilute titanium liquid output pipe at the bottom of the three-section liquid seal tank C3 returns to the second washing zone connected to the disc filter A through the No. 3 pump P3.

[0022] A screw feeder 1 is provided on the unloading area, and a ferrous chute 2 is provided at the outlet of the screw feeder 1. An air hammer 3 is provided on the outer wall of the ferrous chute 2 to prevent the material from sticking to the wall.

[0023] The bottom backflush port of the filter cloth regeneration zone is connected to the backflush pipe 6, and the backflush pipe 6 is connected to the self-compressed air buffer tank 7.

[0024] The dilute titanium liquid output pipe at the bottom of the three-section liquid seal tank C3 is also connected to the inlet of pump P4, and the outlet of pump P4 is connected to the filtered small water tank for acid hydrolysis.

[0025] The exhaust pipes at the top of the No. 1 gas-liquid separator B1, the No. 2 gas-liquid separator B2, and the No. 3 gas-liquid separator B3 are respectively connected to the exhaust manifold D, and the exhaust manifold D is connected to the vacuum buffer tank 8; the drain port at the bottom of the vacuum buffer tank 8 is connected to the three-section liquid seal tank C3.

[0026] The No. 3 outlet pipe b3, the No. 2 outlet pipe b2, and the No. 1 outlet pipe b1 are also connected to cleaning water discharge branch pipes. The cleaning water discharge branch pipes are equipped with manual control valves and are connected to the wastewater main pipe E. The wastewater main pipe E is connected to the ditch.

[0027] The first liquid seal tank C1 is equipped with a first liquid level gauge L1, which is interlocked with the first pump P1; the second liquid seal tank C2 is equipped with a second liquid level gauge L2, which is interlocked with the second pump P2; and the third liquid seal tank C3 is equipped with a third liquid level gauge L3, which is interlocked with the third pump P3 and the fourth pump P4. The second pump P2 is equipped with a pressure gauge for easy control of constant pressure.

[0028] The first washing zone has two outlets at the bottom, each connected to a first washing liquid outlet branch pipe, and the first washing liquid outlet branch pipe is connected to a first washing liquid outlet pipe a1; the third washing zone has two outlets at the bottom, each connected to a third washing liquid outlet branch pipe, and the third washing liquid outlet branch pipe is connected to a third washing liquid outlet pipe a3.

[0029] Work process:

[0030] Rotate the disc filter A to the material distribution area below the titanium crystallization liquid pipe 5. After the titanium crystallization liquid is evenly distributed, it passes through the first washing zone, the second washing zone, and the third washing zone. Under the action of the vacuum system, the titanium crystallization liquid passes through the filter cloth in the first washing zone. The first washing filtrate enters the first liquid seal tank C1 through the first gas-liquid separator B1, and is then transported to the filtered titanium liquid tank by the first pump P1 for use in the concentration process.

[0031] The filter residue containing ferrous sulfate and the residual filtrate are washed in the second washing zone. The washed second washing dilute filtrate enters the second-stage liquid seal tank C2 through the second gas-liquid separator B2, and is then transported by the second pump P2 to the first washing zone of the disc filter A.

[0032] After passing through the second washing zone, the ferrous sulfate and the residual filtrate are washed in the third washing zone. The washed third washing diluted filtrate enters the third-stage liquid seal tank C3 through the third gas-liquid separator B3. Part of the third washing diluted filtrate in the third-stage liquid seal tank C3 is transported to the second washing zone of the disc filter A by the third pump P3, and the other part is transported to the small water tank by the fourth pump P4 for use in the acid hydrolysis process.

[0033] After being washed three times, ferrous sulfate is unloaded into ferrous chute 2 by screw feeder 1 when it passes through the unloading area, and then sent to the next process by belt conveyor.

[0034] After unloading, the filter disc of disc filter A rotates to the filter cloth regeneration zone. Through the backflush pipe 6, the ferrous particles between the pores of the filter cloth are blown out, thus regenerating the filter cloth.

[0035] After being backflushed, the filter cloth rotates back to the cloth area for circulation. During circulation, the production water pipe 4 continuously corresponds to the three washing zones of the disc filter A, supplying washing water to the three washing zones.

[0036] The gas in gas-liquid separators B1, B2, and B3 is connected to vacuum buffer tank 8 through exhaust manifold D. The gas in vacuum buffer tank 8 is extracted by a vacuum pump to facilitate the complete discharge of liquid from the gas-liquid separators.

[0037] After running for a period of time, the disc filter A needs to be cleaned. During cleaning, close the crystallization titanium liquid pipe 5, let the disc filter A run idle, open the production water pipe 4 to rinse the filter cloth, and at the same time open the manual valve on the gas-liquid separator cleaning water discharge branch pipe to discharge the cleaning water to the ditch through the wastewater main pipe E.

Claims

1. A high-efficiency filtration system for the production of titanium dioxide using the sulfuric acid process, comprising a disc filter (A), wherein the disc filter (A) is provided with a cloth feeding area, a first washing area, a second washing area, a third washing area, a discharge area, and a filter cloth regeneration area, characterized in that: The disc filter (A) is equipped with a production water pipe (4) and a crystallizing titanium liquid pipe (5) above it. The bottom outlet of the first washing zone is connected to a washing liquid outlet pipe (a1), which is connected to the first gas-liquid separator (B1). The first liquid outlet pipe (b1) at the bottom of the first gas-liquid separator (B1) is connected to a liquid seal tank (C1). The qualified titanium liquid output pipe at the bottom of the liquid seal tank (C1) is connected to the filtered titanium liquid tank through the first pump (P1) for use in the concentration process. The bottom outlet of the second washing zone is connected to the second washing liquid outlet pipe (a2), which is connected to the second gas-liquid separator (B2). The second liquid outlet pipe (b2) at the bottom of the second gas-liquid separator (B2) is connected to the second-stage liquid seal tank (C2). The dilute titanium liquid output pipe at the bottom of the second-stage liquid seal tank (C2) is returned to the first washing zone connected to the disc filter (A) through the second pump (P2). The bottom outlet of the three washing zone is connected to the three washing liquid outlet pipe (a3), which is connected to the No. 3 gas-liquid separator (B3). The No. 3 liquid outlet pipe (b3) at the bottom of the No. 3 gas-liquid separator (B3) is connected to the three-stage liquid seal tank (C3). The dilute titanium liquid output pipe at the bottom of the three-stage liquid seal tank (C3) is returned to the second washing zone connected to the disc filter (A) through the No. 3 pump (P3). A screw feeder (1) is provided on the unloading area, and a ferrous chute (2) is provided at the outlet of the screw feeder (1). An air hammer (3) is provided on the outer wall of the ferrous chute (2) to prevent the material from sticking to the wall. The bottom backflush port of the filter cloth regeneration zone is connected to the backflush pipe (6), and the backflush pipe (6) is connected to the self-compressed air buffer tank (7).

2. The high-efficiency filtration system for the production of titanium dioxide using the sulfuric acid process according to claim 1, characterized in that: The dilute titanium liquid output pipe at the bottom of the three-section liquid seal tank (C3) is also connected to the inlet of pump No. 4 (P4), and the outlet of pump No. 4 (P4) is connected to a small water tank after filtration for acid hydrolysis.

3. The high-efficiency filtration system for the production of titanium dioxide using the sulfuric acid process according to claim 1, characterized in that: The exhaust pipes at the top of the No. 1 gas-liquid separator (B1), the No. 2 gas-liquid separator (B2), and the No. 3 gas-liquid separator (B3) are respectively connected to the exhaust manifold (D), and the exhaust manifold (D) is connected to the vacuum buffer tank (8); the drain port at the bottom of the vacuum buffer tank (8) is connected to the three-section liquid seal tank (C3).

4. The high-efficiency filtration system for the production of titanium dioxide using the sulfuric acid process according to claim 1, characterized in that: The No. 3 outlet pipe (b3), No. 2 outlet pipe (b2), and No. 1 outlet pipe (b1) are also connected to cleaning water discharge branch pipes. The cleaning water discharge branch pipes are equipped with manual control valves and are connected to the wastewater main pipe (E). The wastewater main pipe (E) is connected to the ditch.

5. The high-efficiency filtration system for the production of titanium dioxide using the sulfuric acid process according to claim 1, characterized in that: The first liquid seal tank (C1) is equipped with a first liquid level gauge (L1) that is interlocked with the first pump (P1); the second liquid seal tank (C2) is equipped with a second liquid level gauge (L2) that is interlocked with the second pump (P2); and the third liquid seal tank (C3) is equipped with a third liquid level gauge (L3) that is interlocked with the third pump (P3) and the fourth pump (P4). The second pump (P2) is equipped with a pressure gauge for easy control of constant pressure.

6. The high-efficiency filtration system for the production of titanium dioxide using the sulfuric acid process according to claim 1, characterized in that: The first washing zone has two bottom outlets, each connected to a first washing liquid outlet branch pipe, and the first washing liquid outlet branch pipe is connected to a first washing liquid outlet pipe (a1); the third washing zone has two bottom outlets, each connected to a third washing liquid outlet branch pipe, and the third washing liquid outlet branch pipe is connected to a third washing liquid outlet pipe (a3).

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