A water rinsing system for alumina production

Abstract

This utility model belongs to the field of alumina production and relates to a water rinsing system in alumina production. It includes a water-washing plate and frame filter press, a water-washing settling tank, and a washing water tank. The inlet of the water-washing plate and frame filter press is connected to the underflow pipe of the water-washing settling tank, and the outlet of the water-washing plate and frame filter press is connected to the washing water tank. The washing water tank is connected to a main pipe, and several washing water pipes are connected to the outer wall of the main pipe. These washing water pipes are respectively connected to the washing water inlet of the water-washing plate and frame filter press and the inlet end of the water-washing settling tank. Each washing water pipe is equipped with a washing water pump. This utility model eliminates the original rinsing water conveying equipment, utilizes existing process equipment and procedures to provide rinsing water for the settling process, saves on the number of equipment used, and reduces energy consumption.

Description

Technical Field

[0001] This utility model belongs to the field of alumina production and relates to a water rinsing system in alumina production. Background Technology

[0002] In the sedimentation process of alumina production using the Bayer process, most materials exist in solid form, such as sedimented bottom flow red mud and discharged red mud. After equipment switchover or pipeline removal from the process, a flushing water process must be connected to flush the relevant equipment and facilities. This is because residual red mud can cause equipment blockages, leading to a series of production accidents.

[0003] Currently, the common flushing method in the process is to install a separate high-pressure water pump to draw hot water from a wastewater tank to flush various equipment and facilities. However, in practical applications, this flushing method has many drawbacks. Frequent start-ups and shutdowns of the high-pressure water pump significantly increase the workload of on-site personnel, and energy consumption remains high. Furthermore, the high speed of the high-pressure water pump during operation makes it difficult to reduce equipment damage rates, leading to continuously increasing maintenance costs. These problems not only affect production efficiency but also increase the company's operating costs. Therefore, there is an urgent need to research a more energy-efficient, high-performance, and low-cost flushing equipment method to solve the problems faced in the current flushing process. Utility Model Content

[0004] The purpose of this invention is to provide a water rinsing system for alumina production. This invention eliminates the original rinsing water conveying equipment and utilizes existing process equipment and procedures to provide rinsing water for the settling process, thereby saving the number of equipment used and reducing energy consumption.

[0005] The technical solution adopted by this utility model is a water rinsing system for alumina production, including a water-rinsing plate and frame filter press, a water-rinsing settling tank, and a washing water tank. The feed inlet of the water-rinsing plate and frame filter press is connected to the underflow pipe of the water-rinsing settling tank, and the liquid outlet of the water-rinsing plate and frame filter press is connected to the washing water tank. The washing water tank is connected to a main pipe, and several washing water pipes are connected to the outer wall of the main pipe. The several washing water pipes are respectively connected to the washing water inlet of the water-rinsing plate and frame filter press and the inlet end of the water-rinsing settling tank. Each washing water pipe is equipped with a washing water pump.

[0006] The features of this utility model also include:

[0007] Preferably, the water washing settling tank is equipped with an overflow pipe, and the outlet end of the overflow pipe is connected to the washing water tank.

[0008] Preferably, the inlet of the water washing settling tank is provided with an end cap.

[0009] Preferably, the underflow pipe of the water washing settling tank is equipped with an underflow pump.

[0010] Preferably, the outlets of the wash pumps for each pair of lines are connected to the same wash pipe.

[0011] Preferably, a Y-type valve is installed between the outlet of the wash water pump and the wash water manifold for isolation.

[0012] Preferably, there are multiple washing and settling tanks, which are raised one by one on a stepped platform. A mixing tank is provided on the outer side of the upper part of each washing and settling tank, and the mixing tank is connected to the adjacent washing and settling tank through an underflow pipe.

[0013] Preferably, the mixing tank at the highest point is connected to a fresh water inlet pipe.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. Based on the existing process, this utility model does not add new equipment, but uses a continuously running washing water pump to provide hot water for the sedimentation and rinsing process. This ensures the normal operation of the sedimentation and rinsing water process, reduces the amount of process operation, and lowers energy consumption and labor costs.

[0016] 2. By eliminating the high-pressure water pump, this utility model reduces the costs that may be incurred due to the operation and maintenance of the high-pressure water pump, and lowers the equipment maintenance cost.

[0017] 3. This utility model relates to a system where the outlets of the wash water pumps for every two lines are connected to the same wash water manifold, and a DN200 Y-type valve is installed between the wash water pump outlet and the wash water manifold for isolation. When it is necessary to perform maintenance, repair, or replacement operations on a specific wash water pump or related pipeline, the connection between the wash water pump and the wash water manifold can be cut off by closing the Y-type valve, preventing the continued flow of flushing water, avoiding water leakage from interfering with the maintenance work, ensuring the safety of maintenance personnel, and also preventing equipment from being damaged due to operation with water. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a connection diagram of the present invention;

[0020] Figure 2 This is a schematic diagram of the water washing settling tank structure of this utility model;

[0021] In the diagram, 1. Washing plate and frame filter press; 2. Washing settling tank; 3. Mixing tank; 4. Fresh water inlet pipe; 5. Washing water tank; 6. Main pipe; 7. Washing water pipe; 8. Washing water combination pipe; 9. Overflow pipe; 10. Washing water pump; 11. Washing underflow pump; 12. End cover; 21. Primary washing settling tank; 22. Secondary washing settling tank; 23. Tertiary washing settling tank; 24. Quaternary washing settling tank. Detailed Implementation

[0022] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] The following is in conjunction with the appendix Figure 1 To be continued Figure 2 The present invention will be described in detail with reference to specific embodiments:

[0024] A water rinsing system for alumina production, reference Figure 1 , 2 The system includes a plate and frame filter press 1, a washing settling tank 2, and a washing tank 5. The inlet of the plate and frame filter press 1 is connected to the underflow pipe of the washing settling tank, and the outlet of the plate and frame filter press 1 is connected to the washing tank 5. The washing tank 5 is connected to a main pipe 6, and the outer wall of the main pipe 6 is connected to several washing pipes 7. The several washing pipes 7 are respectively connected to the washing water inlet of the plate and frame filter press 1 and the inlet end of the washing settling tank 2. Each washing pipe 7 is equipped with a washing water pump 10. In the original process, a high-pressure water pump was installed on the main pipe 6 alone. The high-pressure water pump drew hot water from the washing tank 5 to rinse the equipment and facilities. After modification, the outer wall of the main pipe 6 is connected to several washing pipes 7, and the several washing pipes 7 are respectively connected to the washing water inlet of the plate and frame filter press 1 and the inlet end of the washing settling tank 2. Each washing pipe 7 is equipped with a washing water pump 10. In the on-site process, the wash water pump 10 operates continuously, providing a stable supply of hot water for the settling and rinsing process. Meanwhile, the high-pressure water pump is no longer used.

[0025] To ensure the pressure and flow rate of the flushing water, the outlets of the flushing water pumps 10 of each pair of lines are connected to the same flushing water manifold 8.

[0026] The outlet of the wash water pump 10 is isolated from the wash water manifold 8 by a DN200 Y-type valve. When it is necessary to perform maintenance, repair or replacement of a specific wash water pump or related pipeline, the connection between the wash water pump and the wash water manifold can be cut off by closing the Y-type valve to prevent the flushing water from continuing to flow, avoid water leakage from interfering with the maintenance work, ensure the safety of maintenance personnel, and also prevent the equipment from being damaged due to operation with water.

[0027] The water washing settling tank 2 is equipped with an overflow pipe 9, and the outlet end of the overflow pipe 9 is connected to the washing tank 5.

[0028] The opening of the water washing settling tank 2 is equipped with an end cap 12.

[0029] The underflow pipe of the water washing settling tank 2 is equipped with a washing underflow pump 11.

[0030] There are multiple water washing and settling tanks 2. The water washing and settling tanks 2 are raised one by one on the stepped platform. The upper outer side of each water washing and settling tank 2 is equipped with a mixing tank 3. The mixing tank 3 is connected to the adjacent water washing and settling tank 2 through a pipe.

[0031] The mixing tank 3, located at the highest point, is connected to a fresh water inlet pipe 4, which supplies fresh water to the mixing tank 6.

[0032] refer to Figure 2 In this embodiment, the washing and settling tank 2 includes a primary washing and settling tank 21, a secondary washing and settling tank 22, a tertiary washing and settling tank 23, and a quaternary washing and settling tank 24. The primary washing and settling tank 2, the secondary washing and settling tank 3, the tertiary washing and settling tank 4, and the quaternary washing and settling tank 5 are sequentially raised and fixedly set on a stepped platform. The primary washing and settling tank 21, the secondary washing and settling tank 22, the washing and settling tank 23, and the quaternary washing and settling tank 24 have the same structure, and the tank opening is provided with an end cap 12.

[0033] The bottom-washing underflow pump 11 is turned on to deliver a mixed slurry containing red mud and flocculant to the adjacent and higher mixing tank 3. The red mud and flocculant delivered from the bottom of the water washing settling tank 2 into the mixing tank 3 are mixed in the mixing tank 3 and then flow by gravity into the lower water washing settling tank 2 to settle and form an upper clear liquid and a mixed slurry containing red mud and flocculant. The mixed slurry containing red mud and flocculant passes from low to high in the first washing settling tank 21, the second washing settling tank 22 and finally reaches the fourth washing settling tank 24. After four washings, it finally enters the feed inlet of the water washing plate and frame filter press 1 from the underflow pipe of the fourth washing settling tank 24.

[0034] The water rinsing system for alumina production provided in this embodiment works on the following principle:

[0035] After the fresh water enters the mixing tank 3 located at the highest point through the fresh water inlet pipe 4, the bottom flow pump 11 is turned on to transport the mixed slurry containing red mud and flocculant from the bottom of the water washing settling tank 2 (such as the primary water washing settling tank 21) to the mixing tank 3, so that it is mixed with the fresh water. The mixed slurry flows by gravity into the water washing settling tank 2 located at the lower point (such as the secondary water washing settling tank 22) for sedimentation and separation, forming an upper clear liquid and a mixed slurry containing red mud and flocculant. Subsequently, the mixed slurry containing red mud and flocculant flows sequentially from the primary water washing settling tank 21, the secondary water washing settling tank 22, and the water washing settling tank 23 to finally reach the fourth water washing settling tank 24. After four washing processes, the red mud and liquid are further separated.

[0036] The mixed slurry containing red mud and flocculant discharged from the underflow pipe of the four-stage washing settling tank 24 enters the feed inlet of the washing plate and frame filter press 1. The mixed slurry is sent to the washing plate and frame filter press for filtration. The filtrate discharged from the washing plate and frame filter press 1 is transported to the washing tank 5 through a pipeline. The hot water in the washing tank 5 is distributed by the main pipe 6 to several washing pipes 7. The washing pipes 7 are respectively connected to the washing water inlet of the washing plate and frame filter press 1 and the inlet end of the washing settling tank 2. Each washing pipe 7 is equipped with a washing water pump 10 to provide continuous and stable hot water for the settling and rinsing process.

[0037] Throughout the entire operation, the wash water pump 10 operates continuously, providing a stable supply of hot water for the settling and rinsing process, eliminating the need to use the high-pressure water pump on the main pipe 6, thus reducing energy consumption and equipment maintenance costs. Simultaneously, through a rational pipeline design and equipment layout, the red mud filtrate and wash water are recycled, improving resource utilization efficiency.

[0038] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the substance and scope of the present invention. Various modifications made by those skilled in the art to the above embodiments after reading this specification are all within the scope of protection of the present invention.

Claims

1. A water rinsing system for alumina production, characterized in that, The filter press includes a plate and frame filter press (1), a settling tank (2), and a washing tank (5). The feed inlet of the plate and frame filter press (1) is connected to the underflow pipe of the settling tank. The outlet of the plate and frame filter press (1) is connected to the washing tank (5). The washing tank (5) is connected to a main pipe (6). The outer wall of the main pipe (6) is connected to several washing pipes (7). The several washing pipes (7) are respectively connected to the washing water inlet of the plate and frame filter press (1) and the inlet end of the settling tank (2). Each washing pipe (7) is equipped with a washing pump (10).

2. The water rinsing system for alumina production according to claim 1, characterized in that, The water washing settling tank (2) is equipped with an overflow pipe (9), and the outlet end of the overflow pipe (9) is connected to the washing tank (5).

3. The water rinsing system for alumina production according to claim 1, characterized in that, The opening of the water washing settling tank (2) is equipped with an end cap (12).

4. The water rinsing system for alumina production according to claim 2, characterized in that, The underflow pipe of the water washing settling tank (2) is equipped with a washing underflow pump (11).

5. The water rinsing system for alumina production according to claim 2, characterized in that, The outlets of the two wash pumps (10) are connected to the same wash pipe (8).

6. The water rinsing system for alumina production according to claim 5, characterized in that, A Y-type valve is installed between the outlet of the wash water pump (10) and the wash water manifold (8) for isolation.

7. The water rinsing system for alumina production according to claim 1, characterized in that, There are multiple water washing sedimentation tanks (2). The water washing sedimentation tanks (2) are raised one by one on the stepped platform. A mixing tank (3) is provided on the upper outer side of each water washing sedimentation tank (2). The mixing tank (3) is connected to the adjacent water washing sedimentation tank (2) through a pipe.

8. The water rinsing system for alumina production according to claim 7, characterized in that, The mixing tank (3) located at the highest point is connected to a new water inlet pipe (4).

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