Impurity removal device for monopotassium phosphate

Abstract

The utility model relates to the technical field of monopotassium phosphate production, and discloses an impurity removal device for monopotassium phosphate, which comprises an impurity removal pool, a crystallizing pool and a delivery pump, the bottom of the impurity removal pool and the bottom of the crystallizing pool are both communicated with a liquid discharge pipe, and a sealing valve is arranged at the port of the liquid discharge pipe; a mounting seat is fixedly mounted on the outer wall of the impurity removal pool, an electric sliding rail is fixedly mounted at the top of the mounting seat, a lifting plate is fixedly mounted at the movable end of the electric sliding rail, after the filter basket enters a solution, the solution can enter the filter basket, crystals separated out by impurities are intercepted by the filter basket, and the impurities are separated out by the lifting plate. The suction pipe in the filter basket sucks the solution entering the filter basket, the solution is transferred into the crystallizing pond through the delivery pump, the hose and the liquid inlet pipe, crystals separated out by impurity ions are still left in the impurity removal pond, and the filter is arranged before the transfer in the whole process, so that the state of the solution can be better maintained; therefore, the solution entering the crystallizing pond is pure enough.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of potassium dihydrogen phosphate production, specifically to a kind of potassium dihydrogen phosphate impurity removal device. BACKGROUND

[0002] To reduce production finished product, raw material phosphoric acid is generally directly used wet-process phosphoric acid, and wet-process phosphoric acid contains a large amount of impurities, among which metal cations such as aluminum, iron, calcium and magnesium cations directly affect the crystal form during potassium dihydrogen phosphate crystallization, so that the shape, length-diameter ratio and average particle size of the crystal are reduced, ultimately leading to the problems of prolonged crystallization time and poor crystallization effect. During the concentration and crystallization process, due to the influence of the solubility of various substances, salt substances corresponding to impurity ions will precipitate first, at which time an impurity removal device is needed to remove the crystallization of these impurity ions, so as to avoid the pollution of potassium dihydrogen phosphate crystals by impurities. The existing technology is to transfer the solution containing impurity crystals to a filtering device and then filter it. However, because of the transfer and then filtering process, the change in solution temperature during the transfer process will cause the impurity crystals to dissolve or the potassium dihydrogen phosphate crystals to precipitate, neither of which is conducive to the production of potassium dihydrogen phosphate. SUMMARY

[0003] The utility model aims to provide a kind of potassium dihydrogen phosphate impurity removal device to solve the problems raised in the above background.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a kind of potassium dihydrogen phosphate impurity removal device, including impurity removal pool, crystallization pool, delivery pump, the bottom of the impurity removal pool and the crystallization pool is communicated with drain pipe, and the port of the drain pipe is provided with sealing valve;

[0005] The outer wall of the impurity removal pool is fixedly installed with a mounting seat, the top of the mounting seat is fixedly installed with an electric sliding rail, the movable end of the electric sliding rail is fixedly installed with a lifting plate, the bottom of the lifting plate is fixedly installed with a connecting rod, the bottom end of the connecting rod is connected with a filter basket through a connecting piece, the filter basket extends into the impurity removal pool, a suction pipe is installed in the filter basket, the top end of the suction pipe is communicated with a hose, the end of the hose away from the suction pipe is communicated with the input end of the delivery pump, the output end of the delivery pump is communicated with a liquid inlet pipe, and the end of the liquid inlet pipe away from the delivery pump extends into the crystallization pool.

[0006] Further, the filter basket includes a top frame, a filter screen and a support frame, the support frame is provided with four, and is circumferentially arrayed at the bottom of the top frame, the support frame is fixedly installed on the bottom of the top frame, the filter screen is installed in the gap between the four support frames, and the top of the filter screen is fixedly connected with the bottom of the top frame, the outer diameter of the top frame is consistent with the inner diameter of the impurity removal pool, and the suction pipe is rotatably connected with the center of the top frame through a bearing.

[0007] Further, the connecting piece comprises a positioning sleeve and a connecting bolt, the bottom end of the connecting rod is inserted into the positioning sleeve, the positioning sleeve is welded on the top of the top frame, and the connecting bolt fixedly connects the positioning sleeve and the connecting rod together.

[0008] Further, the impurity removal tank is a double-layer structure, cavities are arranged in the inner and outer interlayers of the impurity removal tank, the outer layer structure of the impurity removal tank is made of heat insulation material, and the inner layer structure of the impurity removal tank is made of heat conduction material.

[0009] Further, the cavity is internally provided with a spiral heat exchange pipe, the spiral heat exchange pipe spirally winds around the inner layer structure of the impurity removal tank, and the liquid inlet and the liquid outlet of the spiral heat exchange pipe are arranged to extend out of the cavity.

[0010] Further, the cavity is internally fixedly provided with a temperature sensor one and a temperature sensor two, the temperature sensor one is arranged at a position close to the bottom of the impurity removal tank, and the temperature sensor two is arranged at a position close to the top of the impurity removal tank.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] After the filter basket enters the solution, the solution can enter the filter basket, the crystallization of impurity ions is intercepted by the filter basket, the suction pipe in the filter basket sucks the solution in the filter basket, the solution is transferred to the crystallization tank through the conveying pump, the hose and the liquid inlet pipe, and the crystallization of impurity ions remains in the impurity removal tank, the filter is arranged before the transfer in the whole process, the state of the solution can be better maintained, and the solution in the crystallization tank is pure enough. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structural schematic view of the utility model;

[0014] Figure 2 It is a structural schematic view of the utility model Figure 1 It is a structural schematic view of the back view;

[0015] Figure 3 It is a structural schematic view of the impurity removal tank, the electric sliding rail and the filter basket of the utility model;

[0016] Figure 4 It is a structural schematic view of the impurity removal tank and the filter basket of the utility model;

[0017] Figure 5 It is a structural schematic view of the filter basket of the utility model.

[0018] In the figure: 1, impurity removal tank; 2, crystallization tank; 3, liquid discharge pipe; 4, sealing valve; 5, cavity; 6, spiral heat exchange pipe; 7, temperature sensor one; 8, temperature sensor two; 9, mounting seat; 10, electric sliding rail; 11, lifting plate; 12, connecting rod; 13, connecting piece; 1301, positioning sleeve; 1302, connecting bolt; 14, filter basket; 1401, top frame; 1402, filter screen; 1403, support frame; 15, suction pipe; 16, hose; 17, conveying pump; 18, liquid inlet pipe. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0020] Please refer to Figures 1-5 The utility model provides a kind of technical scheme: a kind of potassium dihydrogen phosphate impurity removal device, including impurity removal tank 1, crystallization tank 2, conveying pump 17, the bottom of impurity removal tank 1, crystallization tank 2 is all communicated with liquid discharge pipe 3, and sealing valve 4 is arranged at the port of liquid discharge pipe 3.

[0021] Impurity removal tank 1 is fixedly installed on the outer wall of mounting seat 9, and the top of mounting seat 9 is fixedly installed with electric sliding rail 10; the movable end of electric sliding rail 10 is fixedly installed with lifting plate 11; the bottom of lifting plate 11 is fixedly installed with connecting rod 12; the bottom end of connecting rod 12 is connected with filter basket 14 through connecting piece 13; filter basket 14 extends into impurity removal tank 1; suction pipe 15 is installed in filter basket 14; the top end of suction pipe 15 is communicated with hose 16; the end of hose 16 away from suction pipe 15 is communicated with the input end of conveying pump 17; the output end of conveying pump 17 is communicated with liquid inlet pipe 18; the end of liquid inlet pipe 18 away from conveying pump 17 extends into crystallization tank 2; after impurity ion in solution in impurity removal tank 1 is crystallized, keep existing temperature, then open electric sliding rail 10 to drive lifting plate 11 to move down, in turn drive connecting rod 12 to move down, so that connecting rod 12 drives filter basket 14 to move down, so that filter basket 14 enters into solution; at this time, solution can enter filter basket 14, and the crystallization of impurity is intercepted by filter basket 14; suction pipe 15 in filter basket 14 sucks solution in filter basket 14; the part of solution is transferred to crystallization tank 2 through conveying pump 17, hose 16 and liquid inlet pipe 18; and the crystallization of impurity ion remains in impurity removal tank 1; the whole process is filtered before transfer, can better maintain the state of solution (the state that impurity ion is precipitated and potassium dihydrogen phosphate is not precipitated), so that the solution in crystallization tank 2 is pure enough.

[0022] The filter basket 14 comprises a top frame 1401, a filter screen 1402, and four support frames 1403 which are circumferentially arranged at the bottom of the top frame 1401 and fixedly installed on the bottom of the top frame 1401, the filter screen 1402 is installed in the gap between the four support frames 1403 and fixedly connected to the top of the top frame 1401, the outer diameter of the top frame 1401 is consistent with the inner diameter of the impurity removal tank 1, and the suction pipe 15 is rotatably connected to the center of the top frame 1401 through a bearing, the top frame 1401 and the support frames 1403 are arranged to form a frame, and then the filter screen 1402 is installed, and the filter screen 1402 is arranged to filter the solution and intercept the crystals, because the suction pipe 15 is rotatably connected to the top frame 1401 through a bearing, the suction pipe 15 can be lifted synchronously during the lifting of the filter basket 14, and the hose 16 connected to the suction pipe 15 can be better diverted and stretched.

[0023] The connecting piece 13 comprises a positioning sleeve 1301 and a connecting bolt 1302, the bottom end of the connecting rod 12 is inserted into the positioning sleeve 1301, the positioning sleeve 1301 is welded on the top of the top frame 1401, and the connecting bolt 1302 fixedly connects the positioning sleeve 1301 and the connecting rod 12 together, the connecting bolt 1302 is used to connect the connecting rod 12 and the positioning sleeve 1301, so that the connecting rod 12 and the positioning sleeve 1301 are detachable, which facilitates the subsequent cleaning of the impurity removal tank 1 and the filter basket 14.

[0024] The impurity removal tank 1 is a double-layer structure, the inner and outer interlayers of the impurity removal tank 1 are provided with cavities 5, the outer layer structure of the impurity removal tank 1 is made of heat insulation material, and the inner layer structure of the impurity removal tank 1 is made of heat conduction structure material, which can effectively control the temperature of the inner layer of the impurity removal tank 1 and reduce the loss of cold and heat.

[0025] The cavity 5 is provided with a spiral heat exchange pipe 6, the spiral heat exchange pipe 6 spirals around the inner layer structure of the impurity removal tank 1, the inlet and outlet of the spiral heat exchange pipe 6 extend out of the cavity 5, the heat exchange medium flowing in the spiral heat exchange pipe 6 exchanges heat with the inner layer structure of the impurity removal tank 1, thereby controlling the temperature change in the impurity removal tank 1 and enabling the crystallization temperature to reach the set value.

[0026] The cavity 5 is fixedly installed with a temperature sensor one 7 and a temperature sensor two 8, the temperature sensor one 7 is arranged near the bottom of the impurity removal tank 1, and the temperature sensor two 8 is arranged near the top of the impurity removal tank 1, which is used to measure the temperature at the top and bottom and determine whether the temperature in the impurity removal tank 1 meets the requirements.

[0027] Working principle: when using, the electric slide rail 10 is opened to lift the filter basket 14, so that the filter basket 14 is separated from the impurity removal tank 1, then the solution is poured into the impurity removal tank 1, the heat exchange medium is passed into the spiral heat exchange pipe 6 to adjust the temperature of the impurity removal tank 1, so that the impurity ions in the solution in the impurity removal tank 1 are crystallized, then the temperature is kept, the electric slide rail 10 is opened to drive the filter basket 14 to descend into the impurity removal tank 1, then gradually immerse into the solution, the solution can enter into the filter basket 14 through the filter screen 1402, while the crystal is blocked by the filter screen 1402, at this time, the conveying pump 17 is opened to suck the solution in the filter basket 14 from the suction pipe 15 into the hose 16, then is conveyed into the liquid inlet pipe 18, the solution in the liquid inlet pipe 18 enters into the crystallization tank 2 to produce potassium dihydrogen phosphate crystal by crystallization.

[0028] Based on the embodiments of the utility model, all other embodiments obtained by the ordinary skilled in the art without making creative labor belong to the scope of the utility model protection.

Claims

1. A device for removing impurities from potassium dihydrogen phosphate, comprising an impurity removal tank (1), a crystallization tank (2), and a delivery pump (17), characterized in that: The bottom of the impurity removal tank (1) and the bottom of the crystallization tank (2) are communicated with a liquid discharge pipe (3), and a sealing valve (4) is arranged at the port of the liquid discharge pipe (3). The outer wall of the impurity removal tank (1) is fixedly provided with a mounting seat (9), the top of the mounting seat (9) is fixedly provided with an electric sliding rail (10), the movable end of the electric sliding rail (10) is fixedly provided with a lifting plate (11), the bottom of the lifting plate (11) is fixedly provided with a connecting rod (12), the bottom end of the connecting rod (12) is connected with a filter basket (14) through a connecting piece (13), the filter basket (14) extends into the impurity removal tank (1), a suction pipe (15) is arranged in the filter basket (14), the top end of the suction pipe (15) is communicated with a hose (16), one end of the hose (16) away from the suction pipe (15) is communicated with the input end of a delivery pump (17), the output end of the delivery pump (17) is communicated with a liquid inlet pipe (18), and the other end of the liquid inlet pipe (18) away from the delivery pump (17) extends into the crystallization tank (2).

2. The device for removing impurities from potassium dihydrogen phosphate according to claim 1, characterized in that: The filter basket (14) comprises a top frame (1401), a filter screen (1402) and support frames (1403), the four support frames (1403) are circumferentially arranged at the bottom of the top frame (1401), the support frames (1403) are fixedly arranged at the bottom of the top frame (1401), the filter screen (1402) is arranged in the gap between the four support frames (1403), and the top of the filter screen (1402) is fixedly connected with the bottom of the top frame (1401), the outer diameter of the top frame (1401) is consistent with the inner diameter of the impurity removal tank (1), and the suction pipe (15) is rotatably connected with the center of the top frame (1401) through a bearing.

3. The device for removing impurities from potassium dihydrogen phosphate according to claim 1, characterized in that: The connecting piece (13) comprises a positioning sleeve (1301) and a connecting bolt (1302), the bottom end of the connecting rod (12) is inserted into the positioning sleeve (1301), the positioning sleeve (1301) is welded to the top of the top frame (1401), and the connecting bolt (1302) fixedly connects the positioning sleeve (1301) and the connecting rod (12) together.

4. The device for removing impurities from potassium dihydrogen phosphate according to claim 1, characterized in that: The impurity removal tank (1) is a double-layer structure, cavities (5) are arranged in the inner and outer interlayers of the impurity removal tank (1), the outer layer structure of the impurity removal tank (1) is made of heat insulation material, and the inner layer structure of the impurity removal tank (1) is made of heat conduction material.

5. The device for removing impurities from potassium dihydrogen phosphate according to claim 4, characterized in that: Spiral heat exchange pipes (6) are arranged in the cavities (5), the spiral heat exchange pipes (6) spiral around the inner layer structure of the impurity removal tank (1), and the inlet and outlet of the spiral heat exchange pipes (6) extend out of the cavities (5).

6. The device for removing impurities from potassium dihydrogen phosphate according to claim 4, characterized in that: Temperature sensor one (7) and temperature sensor two (8) are fixedly arranged in the cavities (5), the temperature sensor one (7) is arranged at a position close to the bottom of the impurity removal tank (1), and the temperature sensor two (8) is arranged at a position close to the top of the impurity removal tank (1).

Images