Slurry filter pressing treatment device

Abstract

The utility model discloses a slurry filter-pressing treatment device which comprises a slurry tank, a filter press, a mother liquor water tank, a clear water tank, a primary washing water tank and at least one N-time washing water tank, and the filter press is provided with an inlet header pipe, an outlet header pipe, a washing water inlet header pipe and a washing water outlet header pipe, an outlet of the slurry tank is connected with an inlet of the filter press through an inlet header pipe provided with a slurry pump and a control valve, an outlet of the filter press is connected with an outlet header pipe, a washing water inlet header pipe is connected to the inlet header pipe, and the outlet header pipe is connected to a washing water outlet header pipe. The washing water outlet header pipe is respectively connected to inlets of the mother liquid tank, the primary washing tank and the N-time washing tank through pipelines with control valves, an outlet of the clear water tank and an outlet of the N-time washing tank are respectively connected to the washing water inlet header pipe through pipelines with control valves and pumps, and an outlet of the primary washing tank is connected to an inlet of the slurry tank through a return pipe. The filter press can effectively save the use amount of clear water for filter pressing treatment and ensure the quality of filter cakes, and can be used for treating iron oxide red slurry or similar slurry.

Description

Technical Field

[0001] This utility model relates to the preparation of iron oxide red, and in particular to a slurry treatment device suitable for pressure filtration of iron oxide red slurry and washing of filter cake. Background Technology

[0002] Currently, iron oxide red is the inorganic pigment with the largest production and usage volume besides titanium dioxide. Traditional preparation methods for iron oxide red include dry and wet processes. Dry processes include calcination of ferrous sulfate, calcination of iron yellow, calcination of iron black, and calcination of ferrous sulfate-soda ash. Wet processes include sulfate, nitrate, and mixed acid salt processes.

[0003] In the wet process of producing iron oxide red, the calcined iron oxide red is fed into a slurry tank to form a primary slurry. The primary slurry is then ground, dissolved, mixed, filtered, and washed to obtain an iron oxide red filter cake. The iron oxide red filter cake is then dried and pulverized to obtain the finished iron oxide red product.

[0004] After the initial slurry is filtered, the mother liquor is discharged from the filter press. The mother liquor contains a certain amount of water-soluble substances, and the filter cake formed after filtration also contains water-soluble substances. These water-soluble substances have a significant impact on the quality of iron oxide red products. Therefore, it is necessary to wash the filter cake to dissolve as much of the water-soluble substances as possible, thereby greatly reducing the content of water-soluble substances in the filter cake and meeting the standard requirements of iron oxide red products.

[0005] The patent application number is CN202322365650.1. This utility model provides a washing device for iron oxide red. Iron oxide red solution and chloride ion removal agent are added to a stirring tank through a dosing pipe and stirred. Then, an electric motor and an electromagnetic rod are used to adsorb and remove impurities from the iron oxide red. After the electromagnetic rod with adsorbed impurities is transferred to a washing tank for cleaning, the washing of iron oxide red and the separation of impurities are realized.

[0006] The utility model relates to a filter cake washing system, with application number CN202320128275.8. The system includes a filtration system, an atomization system, and a positive pressure system. The atomization system can atomize and transfer the washing liquid to the filtration system, and the positive pressure system can inject the atomized washing liquid into the filter cake, which can achieve uniform washing of the filter cake. The system is detachable and can provide all-round spraying and washing.

[0007] Some technologies for the comprehensive utilization of wastewater generated during the washing of iron oxide red filter cake have also been reported. For example, the paper "Research on Wastewater Treatment and Resource Utilization of Iron Oxide Red Plant" by Ge Qilong focuses on the optimal process parameters for treating acidic wastewater from an iron oxide red plant, demonstrating the feasibility of using the wastewater to produce iron oxide red pigment and determining the optimal reaction conditions. Experimental results show that after treatment with NaOH solution, the precipitated iron-containing sludge can be used as iron oxide red seed crystals for the production of iron oxide red pigment, achieving a certain degree of resource utilization of the wastewater.

[0008] "Treatment and Utilization of Wastewater from Iron Oxide Production" by Wang Handong mentions that solids, ammonia nitrogen, sulfate, etc., in washing wastewater can be separated and recovered. The treated water can be recycled in the iron oxide production process without affecting the quality of the iron oxide product. The remaining washing wastewater can be filtered, dried, and roasted to recover iron oxide. After a series of treatments, such as neutralization and precipitation with lime milk to remove sulfate, the filtrate can also obtain ammonia water with a mass fraction of about 15%, which can be sold as a product or used in iron oxide production.

[0009] The existing technologies mentioned above involve washing the iron oxide red filter cake with pure water or clean water, which leads to a large amount of pure water and clean water being used. As for the comprehensive utilization of the washing water for iron oxide red filter cake, it is mainly reused for the production of iron oxide red and not reused for washing the iron oxide red filter cake. Utility Model Content

[0010] To overcome the technical problems of high water consumption and high cost in the existing iron oxide red production technology for filter cake washing, this utility model provides a slurry pressure filtration treatment device. This device can effectively remove water-soluble substances in the iron oxide red filter cake by reusing the washing water of the filter cake, and effectively save water consumption.

[0011] The technical solution adopted by this utility model to solve its technical problem is as follows: a slurry filtration treatment device, including a slurry tank, a filter press, a mother liquor tank, and a clean water tank, and further including a primary wash water tank, a secondary wash water tank, and a tertiary wash water tank. The filter press is equipped with an inlet manifold, an outlet manifold, a wash water inlet manifold, and a wash water outlet manifold. The outlet of the slurry tank is connected to the inlet of the filter press through the inlet manifold equipped with a slurry pump and a feed control valve. The outlet of the filter press is connected to the outlet manifold. The wash water inlet manifold is connected to the inlet manifold of the filter press. The outlet manifold is connected to the wash water outlet manifold. The wash water outlet manifold is connected to the inlet of the mother liquor tank and the outlet of the clean water tank through a pipe equipped with a first control valve. The outlet of the tertiary wash tank is connected to the main wash water inlet pipe via a pipe equipped with a second control valve and a wash water pump. The outlet of the secondary wash tank is connected to the main wash water inlet pipe via a pipe equipped with a third control valve and another wash water pump. The outlet of the secondary wash tank is connected to the main wash water inlet pipe via a pipe equipped with a fourth control valve and yet another wash water pump. The main wash water outlet pipe is connected to the inlet of the primary wash tank via a pipe equipped with a fifth control valve. The main wash water outlet pipe is connected to the inlet of the secondary wash tank via a pipe equipped with a sixth control valve. The main wash water outlet pipe is connected to the inlet of the tertiary wash tank via a pipe equipped with a seventh control valve. The outlet of the primary wash tank is connected to the inlet of the slurry tank via a return pipe equipped with a return pump.

[0012] In the above-mentioned device, by adding a primary washing water tank and an Nth washing water tank, the washing water formed by washing the filter cake multiple times with clean water is stored in stages. Since there is a concentration difference between the water-soluble substances in the washing water and the water-soluble substances in the filter cake during the previous and subsequent washing processes, the washing water stored in stages can be reused for washing the filter cake to achieve the washing effect and save clean water. In addition, considering that the solids concentration in the slurry obtained from the first washing water of the filter cake is relatively high, the primary washing water can be sent back to the slurry tank for further filtration.

[0013] Depending on the concentration of the slurry used or the quality requirements, there may be one, two or more N-stage washing tanks. A more balanced approach is to have two N-stage washing tanks, including a secondary washing tank and a tertiary washing tank, to wash the filter cake three times. This achieves water conservation and also yields a higher quality filter cake with less water-soluble matter.

[0014] The beneficial effects of this invention are: it can effectively save the amount of clean water used in the slurry pressure filtration process and ensure the quality of the filter cake; it can be used for the pressure filtration of iron oxide red or similar slurries. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the slurry pressure filtration device in Embodiment 1 of this utility model.

[0016] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of this utility model.

[0017] Figure 3 This is a structural schematic diagram of Embodiment 3 of this utility model.

[0018] The markings in the diagram are as follows: 1-Slurry tank, 2-Filter press, 3-Mother liquor tank, 4-Clear water tank, 5-Primary wash water tank, 6-Secondary wash water tank, 7-Tertiary wash water tank, 8-Inlet manifold, 9-Outlet manifold, 10-Return pipe, 11-Wash water inlet manifold, 12-Slurry pump, 13-Wash water outlet manifold, 14-Wash water pump, 15-Return pump, 16-Fourth wash water tank, 18-Eighth control valve, 19-Ninth control valve, 20-Feed control valve, 21-First control valve, 22-Second control valve, 23-Third control valve, 24-Fourth control valve, 25-Fifth control valve, 26-Sixth control valve, 27-Seventh control valve. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Example 1:

[0021] like Figure 1 As shown, the slurry filtration device of this utility model is used for filtration of iron oxide red slurry and washing of iron oxide red filter cake. The slurry treatment device includes a slurry tank 1, a filter press 2, a mother liquor tank 3, a clean water tank 4, a primary wash water tank 5, a secondary wash water tank 6, and a tertiary wash water tank 7. The filter press 2 is equipped with an inlet manifold 8, an outlet manifold 9, a wash water inlet manifold 11, and a wash water outlet manifold 13. The outlet of the slurry tank 1 is connected to the inlet of the filter press 2 through the inlet manifold 8, which is equipped with a slurry pump 12 and a feed control valve 20. The outlet of the filter press 2 is connected to the outlet manifold 9. The wash water inlet manifold 11 is connected to the inlet manifold 8 of the filter press 1. The outlet manifold 9 is connected to the wash water outlet manifold 13. The wash water outlet manifold 13 is connected to the inlet of the mother liquor tank 3 through a pipe equipped with a first control valve 21. The outlet of the clean water tank 4 is connected to the inlet of the mother liquor tank 3 through a pipe equipped with a second control valve 22 and a wash water pump 12. Pipe 4 is connected to the wash water inlet main pipe 11. The outlet of the tertiary wash water tank 7 is connected to the wash water inlet main pipe 11 through a pipe equipped with a third control valve 23 and another wash water pump 14. The outlet of the secondary wash water tank 6 is connected to the wash water inlet main pipe 11 through a pipe equipped with a fourth control valve 24 and another wash water pump 14. The wash water outlet main pipe 13 is connected to the inlet of the primary wash water tank 5 through a pipe equipped with a fifth control valve 25. The wash water outlet main pipe 13 is connected to the inlet of the secondary wash water tank 6 through a pipe equipped with a sixth control valve 26. The wash water outlet main pipe 13 is connected to the inlet of the tertiary wash water tank 7 through a pipe equipped with a seventh control valve 27. The outlet of the primary wash water tank 5 is connected to the inlet of the slurry tank 2 through a return pipe 10 equipped with a return pump 15.

[0022] In the iron oxide red slurry filtration stage, the slurry is sent from the slurry tank 1 to the filter press 2 for filtration, the resulting filtrate is sent to the mother liquor tank 3, and the resulting filter cake is left in the filter press 2 for washing.

[0023] In the initial stage of washing the iron oxide red filter cake, when there is no wash water in the primary wash tank 5, the iron oxide red filter cake is washed with clean water for the first time to form primary wash water, which is stored in the primary wash tank 5. In the initial stage of washing the iron oxide red filter cake, when there is no wash water in the secondary wash tank 6, the iron oxide red filter cake is washed with clean water for the second time to form secondary wash water, which is stored in the secondary wash tank 6. In the initial stage of washing the iron oxide red filter cake, when there is no wash water in the tertiary wash tank 7, the iron oxide red filter cake is washed with clean water for the third time to form tertiary wash water, which is stored in the tertiary wash tank 7. After the initial stage, when washing the iron oxide red filter cake formed due to the continuation of production and the re-feeding of the filter press, the iron oxide red filter cake is washed for the first time with secondary wash water, and the water after washing the filter cake is called primary wash water; the iron oxide red filter cake is washed for the second time with tertiary wash water, and the water after washing the filter cake is called secondary wash water; the iron oxide red filter cake is washed for the third time with clean water, and the water after washing the filter cake is called tertiary wash water.

[0024] Since there is a concentration difference between the water-soluble substances in the wash water and the water-soluble substances in the filter cake during the previous and subsequent washing processes, the wash water stored in stages can be reused for washing the filter cake to achieve the washing effect and save clean water. In addition, considering that the solids concentration in the slurry obtained from the first wash water of the filter cake is relatively high, the first wash water can be sent back to the slurry tank for further filtration.

[0025] Example 2:

[0026] like Figure 2 As shown, compared with Example 1, this embodiment removes the three-stage washing tank 7 and its attached third control valve 23, washing pump 14 and seventh control valve 27, and is suitable for situations where only the filter cake is washed twice and the quality requirements are not high.

[0027] Example 3:

[0028] like Figure 3 As shown, compared with Embodiment 1, this embodiment adds a fourth washing tank 16 and its attached eighth control valve 18, washing pump 14 and ninth washing control valve 19, which is suitable for situations where the filter cake needs to be washed four times and the quality requirements are higher.

[0029] In the initial stage of its use, the iron oxide red filter cake is washed for the fourth time with clean water to form four wash waters, which are then stored in the four wash water tank 16. After the initial stage, when washing the iron oxide red filter cake formed due to the continuation of production and the filter press being fed again, the iron oxide red filter cake is washed for the first time with the second wash water, and the water after washing the filter cake forms the first wash water; the iron oxide red filter cake is washed for the second time with the third wash water; the iron oxide red filter cake is washed for the third time with the fourth wash water, and the water after washing the filter cake forms the third wash water; the iron oxide red filter cake is washed for the fourth time with clean water, and the water after washing the filter cake forms the fourth wash water.

[0030] Obviously, this can be extrapolated in the same way.

[0031] In summary, when this utility model is used for the pressure filtration of slurry and the washing of the resulting filter cake, the method of cascading reuse of washing water can effectively save the amount of clean water used.

[0032] In the above embodiments, since the wash water is sent to the filter press through the wash water inlet manifold, the processing device of this utility model can flexibly choose to mix the primary wash water, secondary wash water, etc., with clean water in a certain proportion and then send it in as wash water to complete a certain washing cycle, according to the filter cake quality requirements, in order to improve the washing effect. Of course, doing so will sacrifice some water-saving effect.

Claims

1. A slurry filter pressing treatment device, comprising a slurry tank (1), a filter press (2), a mother liquor water tank (3), and a clean water tank (4), characterized in that: Also included are a primary washing water tank (5), a secondary washing water tank (6), and a tertiary washing water tank (7), the filter press (2) is provided with an inlet manifold (8), an outlet manifold (9), a washing water inlet manifold (11), and a washing water outlet manifold (13), the outlet of the slurry tank (1) is connected to the inlet of the filter press (2) through the inlet manifold (8) provided with a slurry pump (12) and a feed control valve (20), the outlet of the filter press (2) is connected to the outlet manifold (9), the washing water inlet manifold (11) is connected to the inlet manifold (8) of the filter press (1), the outlet manifold (9) is connected to the washing water outlet manifold (13), the washing water outlet manifold (13) is connected to the inlet of the mother liquor tank (3) through a pipeline provided with a first control valve (21), the outlet of the clean water tank (4) is connected to the washing water inlet manifold (11) through a pipeline provided with a second control valve (22) and a washing water pump (14), the outlet of the tertiary washing water tank (7) is connected to the washing water inlet manifold (11) through a pipeline provided with a third control valve (23) and another washing water pump (14), the outlet of the secondary washing water tank (6) is connected to the washing water inlet manifold (11) through a pipeline provided with a fourth control valve (24) and still another washing water pump (14), the washing water outlet manifold (13) is connected to the inlet of the primary washing water tank (5) through a pipeline provided with a fifth control valve (25), the washing water outlet manifold (13) is connected to the inlet of the secondary washing water tank (6) through a pipeline provided with a sixth control valve (26), the washing water outlet manifold (13) is connected to the inlet of the tertiary washing water tank (7) through a pipeline provided with a seventh control valve (27), and the outlet of the primary washing water tank (5) is connected to the inlet of the slurry tank (2) through a back feeding pipe (10) provided with a back feeding pump (15).

2. The slurry press filtration apparatus of claim 1, wherein: The tertiary washing water tank (7) and the third control valve (23), the washing water pump (14), and the seventh control valve (27) attached thereto are removed from the treatment device.

3. The slurry press filtration apparatus of claim 1, wherein: A quaternary washing water tank (16) and an eighth control valve (18), a washing water pump (14), and a ninth washing water control valve (19) attached thereto are added to the treatment device.

Images