Leaching device

Abstract

The utility model relates to a leaching device which is arranged on the upper side of a belt filter (A), and the belt filter (A) is provided with belt filter cloth (A1) moving forwards; the leaching device comprises a storage tank (2) and a leaching pipe (1), the storage tank (2) is a rectangular box body fixedly arranged on the upper side of the belt type filter cloth (A1), the storage tank (2) is provided with a transverse strip-shaped opening (21), the leaching pipe (1) is communicated with a leaching liquid tank, and a vacuum pump is arranged in the middle of the leaching pipe (1) and used for pumping leaching liquid into the storage tank (2); the direction of the strip-shaped opening (21) is perpendicular to the moving direction of the belt type filter cloth (A1), and the length of the strip-shaped opening (21) is not less than the width of a filter area of the belt type filter cloth (A1). The vacuum pump pumps leacheate into the storage tank (2) through the leaching pipe (1), and then the leacheate flows out of the uniform leacheate water curtain through the strip-shaped opening (21), so that the filter cake layer (A2) can be leached uniformly and seamlessly, the filter cake layer is not easy to block, and the pressure and flow of water flow do not need to be controlled deliberately.

Description

Technical Field

[0001] The utility model relates to equipment for the production of inorganic salts, in particular to a rinsing device for rinsing a filter cake layer obtained by a belt filter. Background Art

[0002] In the process of producing salt ore by the crystallization method, a belt filter is often used to separate the solid and liquid of the salt ore slurry. During the filtration process, fresh water is required to rinse the filter cake layer obtained by filtration to remove the residual filtrate therein.

[0003] For example, in the process of producing potassium chloride products by the hot dissolution crystallization method, first, carnallite ore is used to dissolve magnesium chloride in the filtrate, and then the belt filter is used to filter to obtain a filter cake layer, namely artificial sylvite. Then, the artificial sylvite is hot-melt crystallized to obtain potassium chloride products.

[0004] Too high content of magnesium chloride in artificial sylvite will make it difficult to control the subsequent process and also lead to poor quality of potassium chloride products. It has been found through research that magnesium chloride mainly comes from the filtrate remaining in the filter cake layer. Spraying the filter cake layer with a rinsing device can displace the filtrate remaining in the filter cake layer, thereby reducing the content of magnesium chloride in artificial sylvite. Figure 4 The structure of the existing rinsing equipment is shown, including a rinsing water pipe 01 horizontally arranged above the belt filter A. A plurality of small holes 011 are arranged on the lower side of the rinsing water pipe 01. During production, the belt filter cloth A1 of the belt filter A filters and carries the filter cake layer A2 forward. After the rinsing liquid is pumped into the rinsing water pipe 01, it is sprayed out from the small holes 011 to form a fan-shaped water column 012 to rinse the filter cake layer A2. However, there are three problems with the existing rinsing equipment:

[0005] First, there are gaps between the water columns sprayed out from the small holes, resulting in part of the filter cake layer not being rinsed;

[0006] Second, to ensure that a fan-shaped water column can be sprayed out from the small holes, the diameter of the small holes must be small, resulting in the small holes being more likely to be blocked;

[0007] Third, it is difficult to control the pressure and flow rate of the rinsing liquid. If the pressure and flow rate are too low, the sprayed fan-shaped water column is too narrow and it is more difficult to cover the filter cake layer; if the pressure and flow rate are too high, the impact force of the water column on the filter cake layer is large, resulting in uneven thickness of the filter cake layer, which will instead affect the filtration effect of the belt filter and also waste water resources. Summary of the Utility Model

[0008] The purpose of the utility model is to provide a rinsing device that can rinse the filter cake layer of the belt filter evenly and without gaps, is not easily blocked, and is easy to control the pressure and flow rate of the water flow.

[0009] For the above purpose, the utility model provides a rinsing device, which is arranged on the upper side of the belt filter A.

[0010] The belt filter A has a belt filter cloth A1 that moves forward.

[0011] The flushing device includes: a storage tank 2 and a flushing pipe 1.

[0012] The storage tank 2 is a rectangular box fixedly arranged above the belt filter cloth A1. The storage tank 2 has a transverse strip-shaped opening 21, and a vacuum pump pumps the flushing liquid into the storage tank 2 through the flushing pipe 1.

[0013] The direction of the strip-shaped opening 21 is perpendicular to the moving direction of the belt filter cloth A1, and the length of the strip-shaped opening 21 is not less than the width of the filtering area of the belt filter cloth A1.

[0014] During use, after starting the belt filter A, the belt filter cloth A1 filters the solid-liquid mixture and carries the filter cake layer A2 forward. The vacuum pump pumps the flushing liquid into the storage tank 2 through the flushing pipe 1. Then, the flushing liquid forms a uniform flushing liquid water curtain from the strip-shaped opening 21 to flush the filter cake layer A2.

[0015] Therefore, the flushing liquid water curtain can flush the filter cake layer A2 evenly and without gaps, and there will be no situation where part of the filter cake layer cannot be flushed; the cross-section of the strip-shaped opening 21 is larger than that of the small holes of the existing flushing pipe, so it is not easy to be blocked; the use of the storage tank 2 can relieve the pressure generated by pumping the flushing liquid, so there is no need to deliberately control the pressure and flow rate of the water flow, and only need to prevent the flushing liquid from overflowing from the upper side of the storage tank 2.

[0016] Preferably, the upper side of the storage tank 2 is open to form an opening 200. The flushing pipe 1 includes a horizontal pipe section 11 arranged above the storage tank 2. The end of the horizontal pipe section 11 is sealed, and a plurality of water outlet holes 110 facing the storage tank 2 are evenly arranged on the lower side.

[0017] The meaning of "evenly" here is that the water outlet holes 110 are arranged along the horizontal pipe section 11, and the distance between every two adjacent water outlet holes 110 is equal. Such a structure can disperse the water outlet pressure of the flushing liquid, prevent local splashing or overflow in the storage tank 2 due to the impact of the flushing liquid, and can ensure that the amount of water entering the storage tank 2 is uniform and stable.

[0018] Preferably, the strip-shaped opening 21 is arranged in the upper middle part of the front or rear side of the storage tank 2, so that the flushing liquid flows out evenly from the strip-shaped opening 21 and flows along the outer wall of the storage tank 2. That is, the outer wall can play a guiding role, and can further make the flushing liquid water curtain evenly flush the filter cake layer A2.

[0019] Preferably, a guide plate 22 is arranged below the strip-shaped opening 21. The guide plate 22 is a rectangular plate covering not less than the strip-shaped opening 21, and the included angle with the side wall of the storage tank 2 where the strip-shaped opening 21 is located is an obtuse angle. The guide plate 22 can play a better guiding role and further make the flushing liquid water curtain evenly flush the filter cake layer A2.

[0020] Preferably, the flow guide plate 22 is a flexible plate with elasticity and corrosion resistance, which can play a buffering role, so that the overflow water flowing vertically downward along the outer wall of the storage tank is changed to flow gently along the slope to the filter cake layer, thereby slowing down the flow rate, making the water output more stable and uniform, guiding the overflow water evenly along the slope to the passing filter cake layer A2, and realizing dead-angle-free full-coverage flushing.

[0021] Preferably, the storage tank 2 is provided with a liquid level measuring device, and the flushing pipe 1 is provided with a liquid level control valve 121. The liquid level measuring device is interlocked with the liquid level control valve 121 to control the liquid level of the flushing liquid in the storage tank 2 to be maintained between the strip-shaped opening 21 and the storage tank 2, so as to avoid the situation of insufficient or overflowing flushing liquid.

[0022] Preferably, the liquid level measuring device selects a float liquid level controller 23.

[0023] Preferably, a contactor 3 is further provided. The contactor 3 is fixedly arranged on the upper side of the belt filter cloth A1, and a contact head 31 is arranged at the bottom end for sensing the pressure exerted by the material.

[0024] The flushing pipe 1 is provided with a solenoid valve 122. The contactor 3 is interlocked with the solenoid valve 122 and is used to open after the contact head 31 senses the pressure exerted by the material.

[0025] That is, when the filter cake layer A2 reaches below the contactor 3, the filter cake layer A2 presses the contact head 31 upward, and the contactor 3 controls the solenoid valve 122 to open; when there is no filter cake layer A2 conveyed on the belt filter A, the contact head 31 loses pressure, and the contactor 3 controls the solenoid valve 122 to close.

[0026] Preferably, there is a distance between the bottom end of the contact head 31 and the belt filter cloth A1 to prevent the contact head 31 from scratching the belt filter cloth A1.

[0027] A rotating piece 32 is arranged at the lower end of the contactor 3. The rotating piece 32 is hinged to the rear side of the contact head 31 through a hinge 33. The center line L11 of the hinge 33 is perpendicular to the advancing direction of the belt filter cloth A1, and the rotating piece 32 can rotate around the center line L11 as an axis.

[0028] That is, by using the rotating piece 32 to increase the force-bearing area of the contact head 31, when the filter cake layer A2 reaches below the contactor 3, the rotating piece 32 at the lower end of the contactor 3 is pushed by the filter cake layer A2 and rotates upward, pressing the contact head 31 upward, so that the soft filter cake layer can lift the contact head 31.

[0029] Preferably, the lower end of the rotating piece 32 is bent upward to form a smooth arc, and the included angle between the normal line L2 of the rotating piece 32 and the moving direction of the belt filter cloth A1 is an acute angle, that is, the rotating piece 32 is inclined forward. This can prevent the lower end of the rotating piece 32 from scratching the belt filter cloth A1, and is beneficial for the filter cake layer to push (rotate) the rotating piece 32 forward, preventing the rotating piece 32 from blocking the advancement of the filter cake layer and causing damage to the contactor 3 due to dragging. Description of the Drawings

[0030] Figure 1 is a structural diagram of the flushing device;

[0031] Figure 2 is a structural diagram of the contactor;

[0032] Figure 3 is a diagram showing the use state of the flushing device;

[0033] Figure 4 is a structural diagram of the existing flushing device.

[0034] Reference numerals: A - belt filter; A1 - belt filter cloth; A2 - filter cake layer; 1 - flushing pipe; 11 - horizontal pipe section; 110 - water outlet hole; 121 - liquid level control valve; 122 - solenoid valve; 111 - flushing liquid water column; 2 - storage tank; 200 - opening; 21 - strip-shaped opening; 22 - guide plate; 23 - float liquid level controller; 231 - float; 211 - flushing liquid water curtain; 3 - contactor; 30 - bracket; 31 - contact head; 32 - rotating piece; L2 - normal line of the rotating piece; 33 - hinge; L1 - center line of the hinge; 01 - flushing water pipe; 011 - small hole; 012 - fan-shaped water column. Detailed Embodiment

[0035] The present invention will be described in detail below with reference to the drawings. The following description is a specific implementation of the claims of the present invention.

[0036] Figure 1 shows a structural diagram of the flushing device, Figure 3 shows the use state of the flushing device. Refer to Figure 1 , the flushing device is arranged on the upper side of the belt filter A. The flushing device includes: a storage tank 2, a flushing pipe 1, and a contactor 3.

[0037] As Figure 1 shown, the belt filter A has a belt filter cloth A1 that moves forward. The belt filter cloth A1 is used for solid-liquid separation of solid-liquid mixed materials (such as the slurry obtained after cold decomposition of carnallite in the hot melt crystallization process), and a filter cake layer A2 is formed on the upper side of the belt filter cloth A1. The filtrate passes through the belt filter cloth A1 and falls into the lower collection tank (not shown in the figure), and the belt filter cloth A1 also carries the filter cake layer A2 forward during the filtration process.

[0038] As shown Figure 1 in FIG. 1, the storage tank 2 is a rectangular box made of stainless steel fixedly arranged above the belt filter cloth A1. The upper side is open to form an opening 200. A horizontal strip-shaped opening 21 is arranged in the middle of the front side wall for uniformly flowing out the flushing liquid.

[0039] As shown Figure 1 in FIG. 2, the strip-shaped opening 21 is perpendicular to the moving direction of the belt filter cloth A1, that is, arranged in the left-right direction. The length of the strip-shaped opening 21 is not less than the width of the filtering area of the belt filter cloth A1, so that the flushing liquid can fully flush the filter cake layer A2.

[0040] The flushing pipe 1 is connected to a flushing liquid tank (not shown in the figure). A vacuum pump (not shown in the figure) is arranged in the middle of the flushing pipe 1 for pumping the flushing liquid into the storage tank 2. The flushing pipe 1 includes a horizontal pipe section 11 arranged above the storage tank 2. The end of the horizontal pipe section 11 is sealed, and a plurality of water outlet holes 110 facing the storage tank 2 are uniformly arranged on the lower side.

[0041] A deflector 22 is arranged below the strip-shaped opening 21. The deflector 22 is a rectangular plate with a length not less than that of the strip-shaped opening 21. The included angle between the deflector and the outer side wall of the storage tank 2 is an obtuse angle. The deflector 22 is a flexible plate with elasticity and corrosion resistance, and the surface is smooth and straight.

[0042] As shown Figure 1 in FIG. 3, the storage tank 2 is provided with a liquid level measuring device. The lower limit of measurement of the liquid level measuring device is not less than the position of the strip-shaped opening 21, and the upper limit of measurement is not higher than the upper edge of the storage tank 2. In this embodiment, a floating ball liquid level controller 23 is selected as the liquid level measuring device.

[0043] The above floating ball liquid level controller is an existing device. In the embodiment, a side-mounted floating ball liquid level controller is selected, which has a floating ball 231 that can float on the liquid surface, and a sensor is also arranged to be able to determine according to the height where the floating ball 231 is located, which will not be elaborated here.

[0044] The flushing pipe 1 is provided with a liquid level control valve 121. The liquid level measuring device is interlocked with the liquid level control valve 121 to control the liquid level of the flushing liquid in the storage tank 2 to be maintained between the strip-shaped opening 21 and the storage tank 2.

[0045] Figure 2 FIG. 4 shows the structure of the contactor. In combination Figure 1 with 3 FIG. 5, the contactor 3 is supported by a bracket 30 and is fixedly arranged above the belt filter cloth A1 and in front of the storage tank 2. A contact 31 is arranged at the bottom end, which can sense the pressure exerted by the material, so as to detect whether the material passes through. There is a distance between the bottom end of the contact 31 and the belt filter cloth A1.

[0046] The elution pipe 1 is provided with a solenoid valve 122. The contactor 3 is interlocked with the solenoid valve 122. When the contact head 31 is squeezed, the contactor 3 controls the solenoid valve 122 to open; when the contact head 31 resets due to the disappearance of the pressure received, the solenoid valve 122 closes.

[0047] Combined with Figure 2 、 3 It can be seen that a rotating piece 32 is provided at the lower end of the contactor 3. The rotating piece 32 is hinged to the rear side of the contact head 31 through a hinge 33. The center line L11 of the hinge 33 is perpendicular to the advancing direction of the belt filter cloth A1, and the rotating piece 32 can rotate around the center line L11 as an axis.

[0048] There is a distance of 4 mm between the bottom end of the contact head 31 and the belt filter cloth A1.

[0049] Combined with Figure 1 、 Figure 3 It can be seen that during use, after starting the belt filter A, the belt filter cloth A1 filters the solid-liquid mixture and carries the filter cake layer A2 forward. When the filter cake layer A2 reaches below the contactor 3, the rotating piece 32 at the lower end of the contactor 3 is pushed by the filter cake layer A2 and rotates upward, pressing the contact head 31, and the contactor 3 controls the solenoid valve 122 to open.

[0050] After the solenoid valve 122 is opened, the vacuum pump pumps the eluent into the elution pipe 1, and uniform eluent water columns 111 (represented by dotted lines) flow out from each water outlet hole 110. These eluent water columns 111 enter the storage tank 2 through the opening 200, and the liquid level in the storage tank 2 rises.

[0051] Refer to Figure 3 . After the liquid level in the storage tank 2 rises to the strip-shaped opening 21, the eluent uniformly flows out from the strip-shaped opening 21 and flows along the outer wall of the front side of the storage tank 2 and the flow guide plate 22 to form a uniform eluent water curtain 211 (represented by dotted lines) to wash the advancing filter cake layer A2.

[0052] When there is no filter cake layer A2 being conveyed on the belt filter A, the rotating piece 32 at the lower end of the contactor 3 rotates downward by its own gravity, the contact head 31 loses pressure, the contactor 3 controls the solenoid valve 122 to close, and the supply of the eluent is interrupted.

[0053] Therefore, compared with the prior art, the present utility model has the following beneficial effects:

[0054] The eluent water curtain 211 can wash the filter cake layer A2 evenly and without gaps, and there will be no situation where part of the filter cake layer cannot be washed; the cross-section of the strip-shaped opening 21 is larger than that of the small holes of the existing elution pipe, and it is not easy to be blocked; the use of the storage tank 2 can relieve the pressure generated by pumping the eluent, so there is no need to deliberately control the pressure and flow rate of the water flow, and only need to prevent the eluent from overflowing from the upper side of the storage tank 2.

[0055] The lower side of the horizontal pipe section 11 is evenly provided with water outlet holes 110. The meaning of "evenly" here is that each of the water outlet holes 110 is arranged along the horizontal pipe section 11, and the distance between every two adjacent water outlet holes 110 is equal. Such a structure can disperse the water outlet pressure of the eluent, avoid local splashing or overflow in the storage tank 2 caused by the impact of the eluent, and ensure that the amount of water entering the storage tank 2 is uniform and stable.

[0056] The strip-shaped opening 21 is arranged in the upper middle part of the front or rear side of the storage tank 2, so that the eluent flows out evenly from the strip-shaped opening 21 and flows along the outer wall of the storage tank 2 and the flow guide plate 22. That is, the outer wall and the flow guide plate 22 can play a role in guiding the flow, and can further make the eluent water curtain evenly wash the filter cake layer A2.

[0057] In addition, the flow guide plate 22 can also play a buffering role, changing the overflow water flowing vertically downward along the outer wall of the storage tank to flow gently along the slope to the filter cake layer, thereby slowing down the flow rate, making the water outlet amount more stable and uniform, and guiding the overflow water evenly along the slope to the passing filter cake layer A2 to achieve a non-dead-angle full-coverage washing.

[0058] By using a liquid level measuring device (float liquid level controller 23) and a liquid level control valve 121, the liquid level of the eluent in the storage tank 2 is controlled to be maintained between the strip-shaped opening 21 and the storage tank 2, which can avoid the situation of insufficient or overflow of the eluent.

[0059] By using a contactor 3 with a contact head 31 at the bottom end and a solenoid valve 122, automatic supply of the eluent can be realized.

[0060] There is a distance of 4 mm between the bottom end of the contact head 31 and the belt filter cloth A1, that is, it can prevent the contact head 31 from scratching the belt filter cloth A1.

[0061] The rotating piece 32 is preferably a square and thin iron sheet. By using the rotating piece 32, the force-bearing area of the contact head 31 can be increased. When the filter cake layer A2 reaches below the contactor 3, the rotating piece 32 at the lower end of the contactor 3 is pushed by the filter cake layer A2 and rotates upward, pressing up the contact head 31, so that the soft filter cake layer can lift the contact head 31.

[0062] The lower end of the rotating piece 32 is bent upward to form a smooth arc, and the included angle between the normal line L2 of the rotating piece 32 and the moving direction of the belt filter cloth A1 is an acute angle, that is, the rotating piece 32 is inclined forward. This can prevent the lower end of the rotating piece 32 from scratching the belt filter cloth A1, and is beneficial for the filter cake layer to push (rotate) the rotating piece 32 forward, preventing the rotating piece 32 from blocking the advancement of the filter cake layer and causing damage to the contactor 3 due to dragging.

[0063] It should be noted that the above embodiments illustrate the present invention rather than limit the present invention.

[0064] Those skilled in the art can design alternative embodiments without departing from the scope of the appended claims. For example, the strip-shaped opening 21 and the flow guide plate can be arranged at the rear side of the storage tank 2, or an overflow tank, an overflow pipe and other structures can be arranged above the side of the storage tank 2. Before use, a part of the flushing liquid can be pre-filled in the storage tank 2 so that the flushing liquid can flow out faster.

[0065] The utility model has the advantages of simple structure, low cost, convenient use, can significantly reduce the residue of filtrate substances in the filter cake layer obtained by the belt filter, can significantly improve the quality of potassium chloride products in the production of the hot melt crystallization method, has strong practicability and is suitable for popularization.

Claims

1. A rinsing device is arranged above a belt filter (A), and the belt filter (A) has a belt filter cloth (A1) moving forward, characterized in that, Comprising: A storage tank (2) and a flushing pipe (1), The storage tank (2) is a rectangular box fixedly arranged above the belt filter cloth (A1). The storage tank (2) has a transverse strip-shaped opening (21). The flushing liquid is pumped into the storage tank (2) through the flushing pipe (1) by a vacuum pump, The direction of the strip-shaped opening (21) is perpendicular to the moving direction of the belt filter cloth (A1), and the length of the strip-shaped opening (21) is not less than the width of the filtering area of the belt filter cloth (A1).

2. The elution device according to claim 1, characterized in that, The upper side of the storage tank (2) is open to form an opening (200), The flushing pipe (1) includes a horizontal pipe section (11) arranged above the storage tank (2), The end of the horizontal pipe section (11) is sealed, and a plurality of water outlet holes (110) facing the storage tank (2) are evenly arranged on the lower side.

3. The elution device according to claim 2, wherein, The strip-shaped opening (21) is arranged in the upper middle part of the front or rear side of the storage tank (2).

4. The elution device according to claim 3, wherein A guide plate (22) is arranged below the strip-shaped opening (21), and the included angle between the guide plate (22) and the outer side wall of the storage tank (2) is an obtuse angle.

5. The elution device according to claim 4, characterized in that, The guide plate (22) is an elastic and corrosion-resistant flexible plate.

6. The elution device according to any one of claims 3 to 5, characterized in that, The storage tank (2) is provided with a liquid level measuring device, and the flushing pipe (1) is provided with a liquid level control valve (121). The liquid level measuring device is interlocked with the liquid level control valve (121) to control the liquid level of the flushing liquid in the storage tank (2) to be maintained between the strip-shaped opening (21) and the storage tank (2).

7. The elution device according to claim 6, wherein, The liquid level measuring device selects a float liquid level controller (23).

8. The elution device according to any one of claims 3 to 5, characterized in that, A contactor (3) is also provided. The contactor (3) is fixedly arranged above the belt filter cloth (A1), and a contact head (31) is arranged at the bottom end. The contact head (31) is used to sense the pressure exerted by the material, The flushing pipe (1) is provided with a solenoid valve (122). The contactor (3) is interlocked with the solenoid valve (122) and is used to open after the contact head (31) senses the pressure exerted by the material.

9. The elution device according to claim 8, characterized in that, There is a distance between the bottom end of the contact head (31) and the belt filter cloth (A1), A rotating piece (32) is arranged at the lower end of the contactor (3). The rotating piece (32) is hinged to the rear side of the contact head (31) through a hinge (33). The center line (L1) of the hinge (33) is perpendicular to the advancing direction of the belt filter cloth (A1), and the rotating piece (32) can rotate around the center line (L1).

10. The elution device according to claim 9, characterized in that, The lower end of the rotating piece (32) is bent upward to form a smooth arc, and the included angle between the normal line (L2) of the rotating piece (32) and the moving direction of the belt filter cloth (A1) is an acute angle.

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