CN114130275B - Cadmium chloride mixed crystal hydrate solution production system - Google Patents
Cadmium chloride mixed crystal hydrate solution production system Download PDFInfo
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- CN114130275B CN114130275B CN202111421797.9A CN202111421797A CN114130275B CN 114130275 B CN114130275 B CN 114130275B CN 202111421797 A CN202111421797 A CN 202111421797A CN 114130275 B CN114130275 B CN 114130275B
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- cadmium chloride
- hcl
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- crystal hydrate
- tank
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- YKYOUMDCQGMQQO-UHFFFAOYSA-L cadmium dichloride Chemical compound Cl[Cd]Cl YKYOUMDCQGMQQO-UHFFFAOYSA-L 0.000 title claims abstract description 417
- 239000013078 crystal Substances 0.000 title claims abstract description 140
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 132
- 229910001868 water Inorganic materials 0.000 claims abstract description 130
- 238000002156 mixing Methods 0.000 claims abstract description 98
- 238000004891 communication Methods 0.000 claims abstract description 60
- CXKCTMHTOKXKQT-UHFFFAOYSA-N cadmium oxide Inorganic materials [Cd]=O CXKCTMHTOKXKQT-UHFFFAOYSA-N 0.000 claims abstract description 40
- CFEAAQFZALKQPA-UHFFFAOYSA-N cadmium(2+);oxygen(2-) Chemical compound [O-2].[Cd+2] CFEAAQFZALKQPA-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000002360 preparation method Methods 0.000 claims abstract description 31
- 238000011049 filling Methods 0.000 claims abstract description 25
- 238000011065 in-situ storage Methods 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims description 88
- 238000005070 sampling Methods 0.000 claims description 83
- 238000006243 chemical reaction Methods 0.000 claims description 70
- 238000001514 detection method Methods 0.000 claims description 52
- 230000005484 gravity Effects 0.000 claims description 23
- 238000005303 weighing Methods 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 12
- 238000003860 storage Methods 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 6
- 229910000041 hydrogen chloride Inorganic materials 0.000 abstract description 96
- 239000000243 solution Substances 0.000 description 135
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 99
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 95
- 239000007789 gas Substances 0.000 description 11
- 238000009472 formulation Methods 0.000 description 9
- 239000000843 powder Substances 0.000 description 8
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000001103 potassium chloride Substances 0.000 description 2
- 235000011164 potassium chloride Nutrition 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000013019 agitation Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- HUKFCVYEXPZJJZ-UHFFFAOYSA-N cadmium;hydrate Chemical compound O.[Cd] HUKFCVYEXPZJJZ-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Abstract
The utility model provides a cadmium chloride mixed crystal hydrate solution production system, which comprises a cadmium chloride solution preparation part, a cadmium chloride crystal hydrate mixing part, a filling part and a PLC control operation station; the cadmium chloride solution preparation part is used for directly preparing the cadmium chloride solution by adopting water, HCl and cadmium oxide together in situ; the cadmium chloride crystal hydrate mixing part is used for mixing the cadmium chloride solution prepared by the crystal hydrate and cadmium chloride solution preparing part to form a cadmium chloride mixed crystal hydrate solution; the filling part is used for filling the cadmium chloride mixed crystal hydrate solution formed by the cadmium chloride crystal hydrate mixing part; the PLC control operation station is in communication connection with the cadmium chloride solution preparation part, the cadmium chloride crystal hydrate mixing part and the filling part. The preparation precision of the cadmium chloride mixed crystal hydrate solution is realized by controlling the communication connection of the operation stations through the PLC.
Description
Technical Field
The disclosure relates to the field of cadmium chloride solution application, in particular to a production system of a cadmium chloride mixed crystal hydrate solution.
Background
In thin film solar cells, cadmium chloride solutions are often used to form a cadmium chloride modification layer to improve the electron transport efficiency of the thin film solar cell.
Cadmium chloride solutions are typically prepared by first preparing cadmium chloride and then formulating the cadmium chloride with water. To further improve the performance of the thin film solar cell, it is generally adopted to further add a crystal hydrate (e.g., potassium chloride) to the cadmium chloride solution, thereby forming a cadmium chloride mixed crystal hydrate solution.
Most of the existing cadmium chloride mixed crystal hydrate solutions are manually configured, and the efficiency is low.
In addition, the control precision of manually preparing the cadmium chloride mixed crystal hydrate solution is low.
Disclosure of Invention
In view of the problems in the background art, an object of the present disclosure is to provide a cadmium chloride mixed crystal hydrate solution production system capable of improving the preparation accuracy of a cadmium chloride mixed crystal hydrate solution.
Thus, in some embodiments, a cadmium chloride mixed crystal hydrate solution production system includes a cadmium chloride solution formulation portion, a cadmium chloride crystal hydrate mixing portion, a filling portion, and a PLC control station; the cadmium chloride solution preparation part is used for directly preparing the cadmium chloride solution by adopting water, HCl and cadmium oxide together in situ; the cadmium chloride crystal hydrate mixing part is used for mixing the cadmium chloride solution prepared by the crystal hydrate and cadmium chloride solution preparing part to form a cadmium chloride mixed crystal hydrate solution; the filling part is used for filling the cadmium chloride mixed crystal hydrate solution formed by the cadmium chloride crystal hydrate mixing part; the PLC control operation station is in communication connection with the cadmium chloride solution preparation part, the cadmium chloride crystal hydrate mixing part and the filling part.
In some embodiments, the cadmium chloride solution formulation portion includes a water supply line, an HCl supply line, a cadmium oxide supply line, and a reaction vessel, the water supply line for supplying water into the reaction vessel; the HCl supply line is used for supplying HCl solution into the reaction kettle; the cadmium oxide supply line is used for supplying cadmium oxide into the reaction kettle; the reaction kettle is used for enabling cadmium oxide and HCl which are fed into the reaction kettle to react to form cadmium chloride, and the formed cadmium chloride and water form a cadmium chloride solution; the PLC control operation station is in communication connection with the water supply line, the HCl supply line and the cadmium oxide supply line.
In some embodiments, the water supply line includes a water supply line, a water supply pump, a water supply flow meter, and a water supply solenoid valve, the water supply line being connected between the water supply pump and the reaction tank; the water supply pump is used for pumping external water to the reaction kettle through the water supply pipeline; a water supply flow meter provided in the water supply pipe, the water supply flow meter measuring a flow rate of water in the water supply pipe; a water supply solenoid valve provided in the water supply line, the water supply solenoid valve being configured to adjust a flow rate of water in the water supply line; the PLC control operation station is connected to the water supply pump, the water supply flowmeter and the water supply solenoid valve in a communication manner.
In some embodiments, the HCl supply line includes an HCl tank, an HCl supply line, an HCl supply pump, an HCl supply flow meter, and an HCl supply solenoid valve, the HCl tank storing HCl solution; the HCl supply pipeline is connected between the HCl storage tank and the reaction kettle; the HCl supply pump is arranged on the HCl supply pipeline and is used for pumping the HCl solution in the HCl storage tank to the reaction kettle through the HCl supply pipeline; the HCl supply flowmeter is arranged on the HCl supply pipeline and is used for measuring the flow rate of the HCl solution in the HCl supply pipeline; the HCl supply solenoid valve is arranged on the HCl supply pipeline and is used for adjusting the flow rate of the HCl solution in the HCl supply pipeline; the PLC control operation station is connected to the pump for HCl supply, the flowmeter for HCl supply and the solenoid valve for HCl supply in communication.
In some embodiments, the reaction vessel comprises a vessel body in communication with a water supply line, an HCl supply line, a cadmium oxide supply line.
In some embodiments, the cadmium chloride solution formulation portion further comprises a first detection module and a constant volume agitation tank; the first detection module comprises a first pump, a first filter and a first sampling line, wherein an inlet of the first pump is controlled to be communicated with an outlet at the bottom of the reaction kettle, and an outlet of the first pump is controlled to be communicated with the reaction kettle; the inlet of the first filter is in controlled communication with the outlet of the first pump; the first sampling line is in controlled communication with the outlet of the first filter, and is used for sampling and detecting the pH value and the specific gravity of the cadmium chloride solution formed by the reaction kettle through the communicated first filter, the first pump and the reaction kettle; the constant volume stirring tank is controlled to be communicated with an outlet of the first filter; the PLC control station is communicatively coupled to the first pump and the first filter.
In some embodiments, the constant volume stirred tank is also in controlled communication with a water supply line for supplying water into the constant volume stirred tank; the constant volume stirring tank is also in controlled communication with the HCl supply line for supplying HCl solution into the constant volume stirring tank; the cadmium chloride solution preparation part also comprises a second detection module, the second detection module comprises a second pump, a second filter and a second sampling line, and the inlet of the second pump is controlled to be communicated with the bottom outlet of the constant volume stirring tank; the inlet of the second filter is in controlled communication with the outlet of the second pump; the second sampling line is in controlled communication with an outlet of the second filter and is used for sampling and detecting the pH value and specific gravity of the cadmium chloride solution in the constant-volume stirring tank through the communicated second filter, the second pump and the constant-volume stirring tank; the outlet of the second filter is controlled to be communicated with the cadmium chloride crystal hydrate mixing part; the PLC control station is communicatively coupled to the second pump and the second filter.
In some embodiments, the cadmium chloride crystal hydrate mixing portion includes a mixing and stirring tank, a crystal hydrate supply line, and a weighing mechanism, the mixing and stirring tank including a tank body in controlled communication with the cadmium chloride solution formulation portion to receive the cadmium chloride solution; the crystal hydrate supply line is used for supplying crystal hydrate to the tank body of the mixing stirring tank; the mixing stirring tank also comprises a stirrer, and the stirrer is used for stirring the mixture of the crystal hydrate and the cadmium chloride solution in the tank body; the weighing mechanism is positioned below the tank body of the mixing and stirring tank and is used for supporting the tank body of the mixing and stirring tank and is used for weighing the tank body of the mixing and stirring tank; the PLC control operation station is in communication connection with the stirrer, the crystal hydrate supply line and the weighing mechanism.
In some embodiments, the cadmium chloride crystal hydrate mixing portion further comprises a third detection module and a finished product constant volume tank; the third detection module comprises a third pump, a third filter and a third sampling line, wherein an inlet of the third pump is controlled to be communicated with a lower outlet of a tank body of the mixing and stirring tank; the inlet of the third filter is in controlled communication with the outlet of the third pump; the third sampling line is in controlled communication with the outlet of the third filter, and is used for sampling and detecting the cadmium chloride mixed crystal hydrate solution in the mixing stirring tank through the communicated third filter, the third pump and the mixing stirring tank so as to determine whether the content of crystal hydrate in the cadmium chloride mixed crystal hydrate solution in the mixing stirring tank meets the requirement; the outlet of the third filter is also controlled to be communicated with the mixing and stirring tank so as to return the cadmium chloride mixed crystal hydrate solution discharged from the lower outlet of the tank body of the mixing and stirring tank to the mixing and stirring tank after the sampling and detecting failure by the third sampling line; the finished product constant volume tank is controllably communicated with the outlet of the third filter to receive the qualified cadmium chloride mixed crystal hydrate solution from the mixing and stirring tank; the PLC control station is communicatively coupled to the third pump and the third filter.
In some embodiments, the cadmium chloride crystal hydrate mixing portion further comprises a fourth detection module; the fourth detection module comprises a fourth pump, a fourth filter and a fourth sampling line; the inlet of the fourth pump is controlled to be communicated with the lower discharge port of the finished product constant volume tank; the inlet of the fourth filter is in controlled communication with the outlet of the fourth pump; the fourth sampling line is in controlled communication with the outlet of the fourth filter, and is used for feeding and sampling and detecting the cadmium chloride mixed crystal hydrate solution in the finished product constant volume tank through the fourth filter, the fourth pump and the finished product constant volume tank which are in communication so as to determine whether the content of crystal hydrate in the cadmium chloride mixed crystal hydrate solution in the finished product constant volume tank meets the requirement; the outlet of the fourth filter is also controlled to be communicated with the finished product constant volume tank so as to return the cadmium chloride mixed crystal hydrate solution of the finished product constant volume tank to the finished product constant volume tank after the finished product constant volume tank is sampled and detected to be unqualified through a fourth sampling line; the outlet of the fourth filter is also controlled to be communicated with the tank body of the mixing and stirring tank so as to return the cadmium chloride mixed crystal hydrate solution of the finished product constant volume tank to the tank body of the mixing and stirring tank after the sampling and detection of the failure by the fourth sampling line; the PLC control station is communicatively coupled to the fourth pump and the fourth filter.
The beneficial effects of the present disclosure are as follows: the preparation precision of the cadmium chloride mixed crystal hydrate solution is realized by controlling the communication connection of the operation stations through the PLC. In particular, the adoption of the first detection module, the second detection module, the third detection module and the fourth detection module ensures the configuration precision and the quality stability.
Drawings
Fig. 1 is a schematic diagram of a cadmium chloride mixed crystal hydrate solution production system according to the present disclosure.
Wherein reference numerals are as follows:
outlet of 100 cadmium chloride mixed crystal hydrate solution production system 171b
1 cadmium chloride solution preparation portion 172 second Filter
11 water supply line 172a inlet
Outlet of line 172b for supplying 111 water
112 second sampling line of water supply pump 173
113 flowmeter 2 for supplying water cadmium chloride crystal hydrate mixing part
114 water supply solenoid valve 21 mixing stirring tank
12HCl supply line 211 tank body
121HCl storage tank 211a lower outlet
122HCl supply line 212 stirrer
Pump 22 crystal hydrate supply line for 123HCl supply
124HCl supply flowmeter 221 screw conveyor
125HCl is solenoid valve 23 weighing machine constructs for supply
13 cadmium oxide supply line 24 third detection module
Third pump of 131 screw conveyer 241
14 reaction vessel 241a inlet
141 kettle 241b outlet
142 wrap 242 third filter
143 condenser 242a inlet
143a barrel 242b outlet
143b third sampling line of condensing coil 243
144 agitating unit 25 finished product constant volume jar
145 integral temperature transmitter 251 lower exhaust port
146 bottom outlet 26 fourth detection module
15 first detection Module 261 fourth Pump
151 first pump 261a inlet
151a inlet 261b outlet
151b outlet 262 fourth filter
152 first filter 262a inlet
152a inlet 262b outlet
152b outlet 263 fourth sampling line
153 first sampling line 27 region tail gas suction horn
16 constant volume agitator tank 3 filling portion
161 bottom outlet 31 finished product filling barrel
162 tail gas air pipe 32 scale
17 second detection module 4PLC control operation station
171 second pump
171a inlet
Detailed Description
The drawings illustrate embodiments of the present disclosure, and it is to be understood that the disclosed embodiments are merely examples of the disclosure that may be embodied in various forms and that, therefore, specific details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously practice the disclosure.
Referring to fig. 1, a cadmium chloride mixed crystal hydrate solution production system 100 includes a cadmium chloride solution preparation portion 1, a cadmium chloride crystal hydrate mixing portion 2, and a filling portion 3.
The cadmium chloride solution preparation part 1 is used for directly preparing the cadmium chloride solution by adopting water, HCl and cadmium oxide together in situ. The cadmium chloride crystal hydrate mixing part 2 is used for mixing the cadmium chloride solution prepared by the crystal hydrate and cadmium chloride solution preparing part 1 to form a cadmium chloride mixed crystal hydrate solution. The filling part 3 is used for filling the cadmium chloride mixed crystal hydrate solution formed by the cadmium chloride crystal hydrate mixing part 2.
Compared with the method for preparing the cadmium chloride and then preparing the aqueous solution of the cadmium chloride by the cadmium chloride and the water, in the cadmium chloride solution preparation part 1, the cadmium chloride is formed by the reaction of HCl and cadmium oxide so that the cadmium chloride and the water form the cadmium chloride solution in situ, thereby saving the process steps and related equipment and reducing the production cost.
In the cadmium chloride mixed crystal hydrate solution production system 100, the automation degree of the preparation of the cadmium chloride mixed crystal hydrate solution is improved through the arrangement of the cadmium chloride solution preparation part 1, the cadmium chloride mixed crystal hydrate part 2 and the filling part 3.
As shown in fig. 1, in one example, the cadmium chloride solution formulation portion 1 includes a water supply line 11, an HCl supply line 12, a cadmium oxide supply line 13, and a reaction kettle 14.
The water supply line 11 is used for supplying water into the reaction kettle 14; the HCl supply line 12 is used for supplying HCl solution into the reaction vessel 14; the cadmium oxide supply line 13 is used for supplying cadmium oxide into the reaction kettle 14; the reaction vessel 14 is used for the cadmium oxide and HCl fed therein to react to form cadmium chloride and the formed cadmium chloride reacts with water to form a cadmium chloride solution.
Referring to fig. 1, in an embodiment, the water supply line 11 includes a water supply line 111, a water supply pump 112, a water supply flow meter 113, and a water supply solenoid valve 114. The water supply line 111 is connected between the water supply pump 112 and the reaction vessel 14. The water supply pump 112 pumps external water to the reaction tank 14 through the water supply pipe 111. A water supply flow meter 113 is provided in the water supply line 111, and the water supply flow meter 113 is used to measure the flow rate of water in the water supply line 111. The water supply solenoid valve 114 is provided in the water supply line 111, and the water supply solenoid valve 114 is used to adjust the flow rate of water in the water supply line 111.
The water supply pump 112 may be a stainless steel pure water pump.
The positional relationship between the water supply flow meter 113 and the water supply solenoid valve 114 on the water supply line 111 is not limited, and it is preferable that the water supply flow meter 113 is located upstream of the water supply solenoid valve 114 as shown in fig. 1. The water flows through the water supply flow meter 113 and then through the water supply solenoid valve 114, so that the accuracy of water supply is improved, and the water supply flow meter 113 measures the flow rate of the water in the water supply pipe 111 (i.e., the water delivery amount), and when the water delivery amount reaches a predetermined value (for example, communication with a PLC control operation station described later), the water supply solenoid valve 114 is immediately closed to stop water delivery (for example, by the PLC control operation station described later).
Referring to fig. 1, in one embodiment, HCl supply line 12 includes HCl tank 121, HCl supply line 122, HCl supply pump 123, HCl supply flow meter 124, and HCl supply solenoid valve 125. The HCl tank 121 stores HCl solution; an HCl supply line 122 is connected between the HCl tank 121 and the reaction vessel 14; an HCl supply pump 123 is provided on the HCl supply line 122, the HCl supply pump 123 being for pumping the HCl solution in the HCl tank 121 to the reaction tank 14 via the HCl supply line 122; an HCl supply flow rate 124 meter is provided in the HCl supply line 122, and the HCl supply flow rate meter 124 is configured to measure the flow rate of the HCl solution in the HCl supply line 122; the HCl supply solenoid valve 125 is provided in the HCl supply line 122, and the HCl supply solenoid valve 125 is used to adjust the flow rate of the HCl solution in the HCl supply line 122. In the present disclosure, the HCl solution in HCl tank 121 is an analytically pure hydrochloric acid solution. In order to prevent the corrosion of hydrochloric acid, the HCl supply pump 123 is a perfluorinated pump.
Referring to FIG. 1, in one embodiment, the cadmium oxide supply line 13 includes a screw conveyor 131. The screw conveyor 131 is used to supply cadmium oxide powder to the reaction kettle 14.
Referring to fig. 1, in one embodiment, the reaction vessel 14 includes a vessel body 141. The kettle body 141 is communicated with a water supply line 11, an HCl supply line 12 and a cadmium oxide supply line 13.
Referring to FIG. 1, in one embodiment, the reactor 14 further includes a jacket 142. The jacket 142 is sleeved on the outer periphery of the reaction kettle 14, and the jacket 142 is used for communicating with the circulating cooling water outside to cool the kettle 141. Since the reaction of cadmium oxide and hydrogen chloride in the reaction kettle 14 to form cadmium chloride is exothermic, the cooling of the reaction kettle 14 by simply using water to form a cadmium chloride solution is insufficient, and thus the cooling of the reaction kettle 14 by using external circulating cooling water is required.
Accordingly, the reactor 14 further includes a condenser 143. The condenser 143 is arranged on the kettle body 141, and the condenser 143 is used for condensing and converging the water vapor formed in the reaction process of the cadmium oxide and the hydrogen chloride into the reaction kettle 14, so that the water vapor is prevented from taking away part of the solution, and further, the influence on the amount of the formed cadmium chloride solution is avoided. As shown in fig. 1, the condenser 143 has a cylinder 143a and a condensing coil 143b. One end of the cylinder 143a is communicated with the inside of the kettle body 141, and the other end of the cylinder 143a can be controlled to be opened and closed, preferably the other end of the cylinder 143a is closed in the whole production process, so as to ensure that no cadmium chloride solution is carried out due to the fact that steam is discharged to the environment. The cylinder 143a may employ a glass tube. The condensing coil 143b is fed with circulating cooling water.
As shown in FIG. 1, in one example, the reactor 14 also includes a stirring mechanism 144. The stirring mechanism 144 is used for stirring the raw materials and the products of the reaction kettle 14 for generating the cadmium chloride solution. Thereby accelerating the reaction process of cadmium oxide and hydrogen chloride and the uniformity of the formed cadmium chloride solution.
As shown in FIG. 1, since the reaction of cadmium oxide and hydrogen chloride to form cadmium chloride is an exothermic reaction, the reactor 14 also includes an integral temperature transmitter 145 for monitoring the temperature. An integral temperature transmitter 145 passes through the kettle body 141, and the integral temperature transmitter 145 is used for detecting the temperature of reactants in the kettle body 141 when the cadmium chloride solution is generated. Based on the monitored temperature, the sheath 142 is correspondingly controlled to be filled with circulating cooling water to cool the reaction kettle 14, and then the cadmium chloride solution is cooled, so that the temperature of the reaction kettle 14 is controlled within a specified temperature. The integrated temperature transmitter 145 can realize high-reliability and high-precision temperature detection, and is beneficial to accurate control of the temperature of the reaction kettle 14.
Compared with the prior art that cadmium chloride is prepared firstly and then the cadmium chloride and water are prepared, in the cadmium chloride mixed crystal hydrate solution production system 100, the cadmium chloride solution preparation part 1 directly adopts water, HCl and cadmium oxide to prepare the cadmium chloride solution in situ (particularly in the kettle body 141 of the reaction kettle 14), so that the process and related equipment are simplified and the cost is reduced.
In order to further improve the preparation accuracy of the cadmium chloride solution, as shown in fig. 1, in an example, the cadmium chloride solution preparation portion 1 further includes a first detection module 15 and a constant volume stirring tank 16.
The first detection module 15 includes a first pump 151, a first filter 152, and a first sampling line 153. The inlet 151a of the first pump 151 is controlled to communicate with the bottom outlet 146 of the reaction vessel 14, and the outlet 151b of the first pump 151 is controlled to communicate with the reaction vessel 14. The inlet 152a of the first filter 152 is controlled to communicate with the outlet 151b of the first pump 151. The first sampling line 153 is in controlled communication with the outlet 152b of the first filter 152, and the first sampling line 153 is configured to sample and detect the pH and specific gravity of the cadmium chloride solution formed in the reaction vessel 14 via the first filter 152, the first pump 151 and the reaction vessel 14 in communication. The constant volume agitator tank 16 is in controlled communication with the outlet 152b of the first filter 152. Likewise, in one example, the first pump 151 employs a perfluorinated pump to avoid corrosion of the hydrogen chloride.
In operation, if the pH value detected by sampling is low, the amount of cadmium oxide powder needs to be added to raise the pH value, i.e., the cadmium oxide supply line 13 increases the amount of cadmium oxide powder needed to be added; if the pH of the sample test is too high, then the amount of hydrogen chloride solution needs to be increased to lower the pH, i.e., the HCl supply line 12 will increase the amount of hydrogen chloride solution needed to be increased (specifically by the HCl supply flow meter 124); if the specific gravity of the cadmium chloride solution detected by sampling is low, the amount of cadmium oxide powder needs to be added to increase the specific gravity, i.e. the cadmium oxide supply line 13 increases the amount of the cadmium oxide powder needed to be added; if the specific gravity of the cadmium chloride solution detected by sampling is high, the amount of the hydrogen chloride solution needs to be increased to decrease the specific gravity, i.e., the HCl supply line 12 increases the amount of the hydrogen chloride solution needed to be increased (specifically, by the HCl supply flow meter 124). Further, for the pH value lower/higher and the specific gravity lower/higher detected by sampling (which are all disqualified), the outlet 151b of the first pump 151 is communicated with the reaction kettle 14 and is disconnected from the constant volume stirring tank 16, the cadmium chloride solution formed by the reaction kettle 14 is pumped back into the reaction kettle 14 through the bottom outlet 146 of the reaction kettle 14, the first pump 151 and the top inlet of the reaction kettle 14 until the pH value and the specific gravity detected by sampling are qualified, the outlet 151b of the first pump 151 is disconnected from the communication with the reaction kettle 14 and is communicated with the constant volume stirring tank 16, and the qualified cadmium chloride solution is supplied to the constant volume stirring tank 16. Note that in the cadmium chloride mixed crystal hydrate solution production system, both the pH reference at which the pH value is low/high and the specific gravity reference at which the specific gravity is low/high are judged to be in the ranges, and the amount of the aforementioned increased hydrogen chloride solution and the amount of the cadmium oxide powder are determined on the pH reference and the specific gravity reference. The sample detection of pH and specific gravity can be measured by any suitable well-known instrument.
The constant volume stirring tank 16 is also in controlled communication with the water supply line 11 for supplying water into the constant volume stirring tank 16; the constant volume stirring tank 16 is also in controlled communication with the HCl supply line 12 for supplying HCl solution into the constant volume stirring tank 16; the cadmium chloride solution preparation part 1 further comprises a second detection module 17, wherein the second detection module 17 comprises a second pump 171, a second filter 172 and a second sampling line 173, and an inlet 171a of the second pump 171 is in controlled communication with the bottom outlet 161 of the constant volume stirring tank 16; the inlet 172a of the second filter 172 is in controlled communication with the outlet 171b of the second pump 171; the second sampling line 173 is controllably communicated with the outlet 172b of the second filter 172, and the second sampling line 173 is used for sampling and detecting the pH value and the specific gravity of the cadmium chloride solution in the constant volume stirring tank 16 through the communicated second filter 172, the second pump 171 and the constant volume stirring tank 16; the outlet 172b of the second filter 172 is in controlled communication with the cadmium chloride crystal hydrate mixing portion 2. Likewise, the second pump 171 employs a perfluorinated pump to avoid corrosion of the hydrogen chloride.
The function of the second detection module 17 is the same as that of the first detection module 15, and it is determined whether the pH value deviates from the pH reference and the specific gravity deviates from the specific gravity reference, the target of the first detection module 15 is the reaction tank 14, and the target of the second detection module 17 is the constant volume stirring tank 16.
If the cadmium chloride solution sampled through the second sampling line 173 is acceptable, the cadmium chloride solution in the constant volume stirring tank 16 enters the cadmium chloride crystal hydrate mixing section 2 via the bottom outlet 161, the second pump 171, and the second filter 172.
If the cadmium chloride solution sampled through the second sampling line 173 is not acceptable, specifically, if the pH value detected through the second sampling line 173 is low, the amount of water needs to be added to raise the pH value, i.e., the amount of water needs to be increased to the constant volume stirring tank 16 through the water supply line 12; if the pH value detected by the sampling through the second sampling line 173 is higher, the amount of hydrogen chloride needs to be added to raise the pH value, that is, the amount of the hydrogen chloride solution to be added is increased to the constant volume stirring tank 16 through the HCl supply line; if the specific gravity detected by the sampling through the second sampling line 173 is low, the cadmium chloride solution in the constant volume stirring tank 16 is returned to the constant volume stirring tank 16 via the bottom outlet 161 and the second pump 171 and the amount of the cadmium oxide powder to be added is increased to the reaction tank 14 through the aforementioned cadmium oxide supply line 13 (specifically, communication control by the PLC control operation station 4 described later); if the specific gravity detected by the sampling through the second sampling line 173 is high, the amount of water to be added is required to reduce the specific gravity, i.e., the amount of water to be added is increased to the constant volume tank 16 through the water supply line 12. Further, for the lower/higher pH value and lower/higher specific gravity (both of these are unacceptable) of the sampling test, the cadmium chloride solution in the constant volume stirring tank 16 is returned to the constant volume stirring tank 16 via the bottom outlet 161 and the second pump 171. Until the detected pH and specific gravity are acceptable by sampling through the second sampling line 173, the cadmium chloride solution in the constant volume stirring tank 16 is supplied to the cadmium chloride crystal hydrate mixing section 2 via the second pump 171 and the second filter 172.
The constant volume stirring tank 16 is also provided with a tail gas air pipe 162; the vent gas plenum 162 is configured to provide a slight negative pressure to prevent vent gas from escaping from the constant volume blender jar 16. The value of the slight negative pressure may be such that the off-gas in the stirring tank 16 is prevented from overflowing.
Referring to fig. 1, in one embodiment, a cadmium chloride crystal hydrate mixing portion 2 includes a mixing agitator tank 21, a crystal hydrate supply line 22, and a weighing mechanism 23. The mixing tank 21 comprises a tank body 211, and the tank body 211 is in controlled communication with the cadmium chloride solution preparation part 1 to receive the cadmium chloride solution, namely, the qualified cadmium chloride solution of the cadmium chloride solution preparation part 1. The crystal hydrate supply line 22 is used to supply crystal hydrate to the tank body 211 of the mixing tank 21. The mixing tank 21 further includes a stirrer 212, and the stirrer 212 is used for stirring the mixture of the crystal hydrate and the cadmium chloride solution in the tank 211. The weighing mechanism 23 is located below the tank 211 of the mixing tank 21 and supports the tank 211 of the mixing tank 21, and the weighing mechanism 23 is used for weighing the tank 211 of the mixing tank 21.
Specifically, the tank body 211 of the mixing tank 21 is controlled to be connected to the outlet 172b of the second filter 172 of the second detection module 17 of the cadmium chloride solution preparing unit 1, and after the second sampling line 173 of the second detection module 17 samples and detects the passing of the detection, the passing cadmium chloride solution is pumped by the second pump 171 and filtered by the second filter 172 to be supplied to the tank body 211 of the mixing tank 21.
In this embodiment, the weighing mechanism 23 displays and weighs in real time and is interlocked (i.e., communicatively connected) with the crystal hydrate supply line 22, and automatically stops the crystal hydrate supply line 22 from delivering crystal hydrate after the weight reaches the standard.
In one example, the crystalline hydrate is potassium chloride, but is not limited thereto, and any suitable crystalline hydrate may be employed as desired.
Referring to fig. 1, in one embodiment, similar to the cadmium oxide supply line 13 of the cadmium chloride solution formulation portion 1, the crystal hydrate supply line 22 includes a screw conveyor 221, the screw conveyor 221 being used to supply a metered amount of crystal hydrate powder to the mixing drum 21.
Referring to fig. 1, in one embodiment, similar to the cadmium chloride solution formulation portion 1, the cadmium chloride crystal hydrate mixing portion 2 further includes a third detection module 24 and a finished product metering tank 25.
The third detection module 24 includes a third pump 241, a third filter 242, and a third sampling line 243. The inlet 241a of the third pump 241 is controlled to be communicated with the lower outlet 211a of the tank body 211 of the mixing tank 21; the inlet 242a of the third filter 242 is in controlled communication with the outlet 241b of the third pump 241; the third sampling line 243 is controllably connected to the outlet 242b of the third filter 242, and the third sampling line 243 is used for sampling and detecting the cadmium chloride mixed crystal hydrate solution in the mixing and stirring tank 21 through the third filter 242, the third pump 241 and the mixing and stirring tank 21 which are connected to determine whether the content of crystal hydrate in the cadmium chloride mixed crystal hydrate solution in the mixing and stirring tank 21 meets the requirement; the outlet 242b of the third filter 242 is also controlled to be communicated with the mixing and stirring tank 21 so as to return the cadmium chloride mixed crystal hydrate solution discharged from the lower outlet 211a of the tank body 211 of the mixing and stirring tank 21 to the mixing and stirring tank 21 after the sampling and detection failure is detected through the third sampling line 243; the finished fixed volume tank 25 is in controlled communication with the outlet 242b of the third filter 242 to receive the qualified cadmium chloride mixed crystal hydrate solution from the mixing and stirring tank 21.
Likewise, for corrosion resistance, in one example, the third pump 241 is a perfluorinated pump.
Likewise, whether the content of the crystal hydrate in the cadmium chloride mixed crystal hydrate solution meets the requirement or not is based on the specified content range. If the crystal hydrate content is below the prescribed content range, the amount of crystal hydrate required is increased through the crystal hydrate supply line 22; if the crystal hydrate content is higher than the prescribed content range, the amount of supply of the qualified cadmium chloride solution is increased by pumping of the second pump 171 of the cadmium chloride solution formulation portion 1.
Referring to fig. 1, in one embodiment, the cadmium chloride crystal hydrate mixing portion 2 further includes a fourth detection module 26, similar to the second detection module 17 of the cadmium chloride solution formulation portion 1.
The fourth detection module 26 includes a fourth pump 261, a fourth filter 262, and a fourth sampling line 263. The inlet 261a of the fourth pump 261 is controlled to communicate with the lower discharge 251 of the finished constant volume tank 25. The inlet 262a of the fourth filter 262 is controlled to be in communication with the outlet 261b of the fourth pump 261. The fourth sampling line 263 is controllably connected to the outlet 262b of the fourth filter 262, and the fourth sampling line 263 is used for sampling and detecting the cadmium chloride mixed crystal hydrate solution in the finished product fixed volume tank 25 through the fourth filter 262, the fourth pump 261 and the finished product fixed volume tank 25 which are connected to determine whether the content of crystal hydrate in the cadmium chloride mixed crystal hydrate solution in the finished product fixed volume tank 25 meets the requirement. The outlet 262b of the fourth filter 262 is also in controlled communication with the finished product metering tank 25 to pump the cadmium chloride mixed crystal hydrate solution of the finished product metering tank 25 back to the finished product metering tank 25 after the sample detection failure via the fourth sampling line 263. The outlet 262b of the fourth filter 262 is also controlled to be communicated with the tank 211 of the mixing and stirring tank 21 so as to return the cadmium chloride mixed crystal hydrate solution of the finished product constant volume tank 25 to the tank 211 of the mixing and stirring tank 21 after the sampling and detecting failure through the fourth sampling line 263.
Likewise, for corrosion resistance, in one example, the fourth pump 261 is a perfluorinated pump.
Similarly, when the cadmium chloride mixed crystal hydrate solution in the finished product constant volume tank 25 is returned to the tank body 211 of the mixing and stirring tank 21 after the failure is sampled and detected via the fourth sampling line 263, the crystal hydrate supplied via the crystal hydrate supply line 22 and the cadmium chloride solution that is pumped by the second pump 171 of the cadmium chloride solution preparing portion 1 are adjusted as described above until the cadmium chloride mixed crystal hydrate solution in the finished product constant volume tank 25 is supplied to the filling portion 3 after the failure is sampled and detected via the fourth sampling line 263.
Referring to fig. 1, in one embodiment, the cadmium chloride crystal hydrate mixing portion 2 further includes a zone tail gas extraction horn 27. A zone exhaust draft horn 27 is provided above the mixing tank 21 for sucking exhaust gas or dust around the mixing tank 21. The tail gas around the mixing tank 21 comes from the tail gas overflowed from the mixing tank 21 through the interfaces (for example, the opening and closing of the interfaces of the crystal hydrate feeding line 2 for feeding the crystal hydrate), so that the environment of the production workshop of the cadmium chloride mixed crystal hydrate solution is guaranteed to be healthy to operators, and meanwhile, the problem that the preparation of the cadmium chloride mixed crystal hydrate solution in the mixing tank 21 is influenced due to the fact that the interfaces are directly sucked by the regional tail gas suction horns 27 is avoided. Dust comes from the crystal hydrate feed line 2.
Referring to fig. 1, in one example, the finish filling portion 3 includes a finish filling barrel 31 and a scale 32. The finished product filling barrel 31 is controllably communicated with the outlet of the fourth filter 262 to receive and pack the qualified cadmium chloride mixed crystal hydrate solution; the scale 32 is used to weigh the finished filling barrel 31.
The scale 32 may be an electronic scale, the accuracy of which may be determined by selecting an appropriate type.
Referring to fig. 1, the cadmium chloride solution preparing part 1 further includes a PLC control operation station 4, and the PLC control operation station 4 is communicatively connected to the cadmium chloride solution preparing part 1, the cadmium chloride crystal hydrate mixing part 2, and the filling part 3.
Specifically, for the cadmium chloride solution preparing unit 1, the plc control operation station 4 is communicatively connected to the water supply pump 112, the water supply flowmeter 113, the water supply solenoid valve 114, the HCl supply pump 123, the HCl supply flowmeter 124, the HCl supply solenoid valve 125, the screw conveyor 131, the stirring device 144, the integrated temperature transmitter 145, the first pump 151, the first filter 152, the second pump 171, and the second filter 172; for the cadmium chloride crystal hydrate mixing part, the PLC control operation station 4 is in communication connection with the stirrer 212, the screw conveyor 221, the weighing mechanism 23, the third pump 241, the third filter 242, the fourth pump 261, the fourth filter 262 and the regional exhaust air suction horn 27; for the filling section, the PLC control console 4 is communicatively connected to the scale 32.
The PLC controls the communication connection of the operation station 4, so that the preparation precision of the cadmium chloride mixed crystal hydrate solution is realized, and particularly, the adoption of the first detection module 15, the second detection module 17, the third detection module 24 and the fourth detection module 25 ensures the preparation precision and the quality stability.
Note that, in this context, "controlled communication" is performed by respective valves which can be communicatively connected to the PLC control station 4 to increase the degree of automation of production.
The exemplary embodiments are described using the above detailed description, but are not intended to be limited to the combinations explicitly disclosed herein. Thus, unless otherwise indicated, the various features disclosed herein may be combined together to form a number of additional combinations that are not shown for the sake of brevity.
Claims (7)
1. A cadmium chloride mixed crystal hydrate solution production system (100) is characterized by comprising a cadmium chloride solution preparation part (1), a cadmium chloride crystal hydrate mixing part (2), a filling part (3) and a PLC control operation station (4);
the cadmium chloride solution preparation part (1) is used for directly preparing the cadmium chloride solution by adopting water, HCl and cadmium oxide together in situ;
the cadmium chloride crystal hydrate mixing part (2) is used for mixing the cadmium chloride solution prepared by the crystal hydrate and cadmium chloride solution preparing part (1) to form a cadmium chloride mixed crystal hydrate solution;
the filling part (3) is used for filling the cadmium chloride mixed crystal hydrate solution formed by the cadmium chloride crystal hydrate mixing part (2);
the PLC control operation station (4) is in communication connection with the cadmium chloride solution preparation part (1), the cadmium chloride crystal hydrate mixing part (2) and the filling part (3);
the cadmium chloride solution preparation part (1) comprises a water supply line (11), an HCl supply line (12), a cadmium oxide supply line (13) and a reaction kettle (14),
the water supply line (11) is used for supplying water into the reaction kettle (14);
the HCl supply line (12) is used for supplying HCl solution into the reaction kettle (14);
a cadmium oxide supply line (13) for supplying cadmium oxide into the reaction kettle (14);
the reaction kettle (14) is used for enabling cadmium oxide and HCl which are fed into the reaction kettle to react to form cadmium chloride, and the formed cadmium chloride and water form a cadmium chloride solution;
the PLC control operation station (4) is in communication connection with a water supply line (11), an HCl supply line (12) and a cadmium oxide supply line (13);
the cadmium chloride solution preparation part (1) further comprises a first detection module (15) and a constant volume stirring tank (16);
the first detection module (15) comprises a first pump (151), a first filter (152) and a first sampling line (153),
an inlet (151 a) of the first pump (151) is controlled to be communicated with a bottom outlet (146) of the reaction kettle (14), and an outlet (151 b) of the first pump (151) is controlled to be communicated with the reaction kettle (14);
an inlet (152 a) of the first filter (152) is in controlled communication with an outlet (151 b) of the first pump (151);
the first sampling line (153) is controlled to be communicated with an outlet (152 b) of the first filter (152), and the first sampling line (153) is used for sampling and detecting the pH value and the specific gravity of the cadmium chloride solution formed by the reaction kettle (14) through the communicated first filter (152), the first pump (151) and the reaction kettle (14);
the constant volume stirring tank (16) is controlled to be communicated with an outlet (152 b) of the first filter (152);
the PLC control operation station (4) is connected to the first pump (151) and the first filter (152) in a communication mode;
the constant volume stirring tank (16) is also in controlled communication with the water supply line (11) for supplying water into the constant volume stirring tank (16);
the constant volume stirring tank (16) is also in controlled communication with the HCl supply line (12) for supplying HCl solution into the constant volume stirring tank (16);
the cadmium chloride solution preparation part (1) also comprises a second detection module (17),
the second detection module (17) comprises a second pump (171), a second filter (172) and a second sampling line (173),
an inlet (171 a) of the second pump (171) is in controlled communication with a bottom outlet (161) of the constant volume stirring tank (16);
an inlet (172 a) of the second filter (172) is in controlled communication with an outlet (171 b) of the second pump (171);
the second sampling line (173) is controlled to be communicated with an outlet (172 b) of the second filter (172), and the second sampling line (173) is used for sampling and detecting the pH value and the specific gravity of the cadmium chloride solution in the constant volume stirring tank (16) through the communicated second filter (172), the second pump (171) and the constant volume stirring tank (16);
the outlet (172 b) of the second filter (172) is in controlled communication with the cadmium chloride crystal hydrate mixing part (2);
the PLC control operation station (4) is connected to the second pump (171) and the second filter (172) in a communication manner.
2. The cadmium chloride mixed crystal hydrate solution production system (100) according to claim 1, wherein,
the water supply line (11) includes a water supply pipe (111), a water supply pump (112), a water supply flow meter (113), and a water supply solenoid valve (114),
a water supply pipe (111) is connected between the water supply pump (112) and the reaction vessel (14);
a water supply pump (112) for pumping external water to the reaction kettle (14) through a water supply pipe (111);
a water supply flow meter (113) is provided to the water supply pipe (111), and the water supply flow meter (113) is configured to measure the flow rate of water in the water supply pipe (111);
a water supply solenoid valve (114) provided in the water supply line (111), the water supply solenoid valve (114) being configured to adjust the flow rate of water in the water supply line (111);
the PLC control operation station (4) is connected to the water supply pump (112), the water supply flowmeter (113), and the water supply solenoid valve (114) in a communication manner.
3. The cadmium chloride mixed crystal hydrate solution production system (100) according to claim 1, wherein,
the HCl supply line (12) comprises a HCl storage tank (121), a HCl supply pipeline (122), a HCl supply pump (123), a HCl supply flowmeter (124) and a HCl supply solenoid valve (125),
an HCl storage tank (121) stores HCl solution;
the HCl supply pipeline (122) is connected between the HCl storage tank (121) and the reaction kettle (14);
an HCl supply pump (123) is provided on the HCl supply pipe (122), and the HCl supply pump (123) is used for pumping the HCl solution in the HCl storage tank (121) to the reaction kettle (14) through the HCl supply pipe (122);
an HCl supply flow meter (124) is provided to the HCl supply line (122), and the HCl supply flow meter (124) is configured to measure the flow rate of the HCl solution in the HCl supply line (122);
an HCl supply solenoid valve (125) is provided in the HCl supply line (122), and the HCl supply solenoid valve (125) is used for adjusting the flow rate of the HCl solution in the HCl supply line (122);
the PLC control operation station (4) is connected to the HCl supply pump (123), the HCl supply flowmeter (124) and the HCl supply solenoid valve (125) in a communication manner.
4. The cadmium chloride mixed crystal hydrate solution production system (100) according to claim 1, wherein,
the reaction kettle (14) comprises a kettle body (141), and the kettle body (141) is communicated with a water supply line (11), an HCl supply line (12) and a cadmium oxide supply line (13).
5. The cadmium chloride mixed crystal hydrate solution production system (100) according to claim 1, wherein,
the cadmium chloride crystal hydrate mixing part (2) comprises a mixing stirring tank (21), a crystal hydrate supply line (22) and a weighing mechanism (23),
the mixing stirring tank (21) comprises a tank body (211), and the tank body (211) is in controlled communication with the cadmium chloride solution preparation part (1) to receive the cadmium chloride solution;
a crystal hydrate supply line (22) for supplying crystal hydrate to a tank body (211) of the mixing tank (21);
the mixing and stirring tank (21) also comprises a stirrer (212), and the stirrer (212) is used for stirring the mixture of the crystal hydrate and the cadmium chloride solution in the tank body (211);
the weighing mechanism (23) is positioned below the tank body (211) of the mixing and stirring tank (21) and supports the tank body (211) of the mixing and stirring tank (21), and the weighing mechanism (23) is used for weighing the tank body (211) of the mixing and stirring tank (21);
the PLC control operation station (4) is in communication connection with the stirrer (212), the crystal hydrate supply line (22) and the weighing mechanism (23).
6. The system (100) for producing a cadmium chloride mixed crystal hydrate solution according to claim 5,
the cadmium chloride crystal hydrate mixing part (2) also comprises a third detection module (24) and a finished product constant volume tank (25);
the third detection module (24) comprises a third pump (241), a third filter (242) and a third sampling line (243),
an inlet (241 a) of the third pump (241) is controlled to be communicated with a lower outlet (211 a) of the tank body (211) of the mixing and stirring tank (21);
an inlet (242 a) of the third filter (242) is in controlled communication with an outlet (241 b) of the third pump (241);
a third sampling line (243) is controlled to be communicated with an outlet (242 b) of the third filter (242), and the third sampling line (243) is used for sampling and detecting the cadmium chloride mixed crystal hydrate solution in the mixing and stirring tank (21) through the communicated third filter (242), a third pump (241) and the mixing and stirring tank (21) so as to determine whether the content of crystal hydrate in the cadmium chloride mixed crystal hydrate solution in the mixing and stirring tank (21) meets the requirement;
the outlet (242 b) of the third filter (242) is also in controlled communication with the mixing and stirring tank (21) so as to return the cadmium chloride mixed crystal hydrate solution discharged from the lower outlet (211 a) of the tank body (211) of the mixing and stirring tank (21) to the mixing and stirring tank (21) after the sampling detection of the failure through the third sampling line (243);
the finished product constant volume tank (25) is controlled to be communicated with an outlet (242 b) of the third filter (242) so as to receive the qualified cadmium chloride mixed crystal hydrate solution from the mixing and stirring tank (21);
the PLC control operation station (4) is connected to the third pump (241) and the third filter (242) in a communication manner.
7. The system (100) for producing a cadmium chloride mixed crystal hydrate solution according to claim 6,
the cadmium chloride crystal hydrate mixing part (2) also comprises a fourth detection module (26);
the fourth detection module (26) comprises a fourth pump (261), a fourth filter (262) and a fourth sampling line (263);
an inlet (261 a) of the fourth pump (261) is controlled to be communicated with a lower discharge port (251) of the finished constant volume tank (25);
an inlet (262 a) of the fourth filter (262) is in controlled communication with an outlet (261 b) of the fourth pump (261);
the fourth sampling line (263) is controlled to be communicated with an outlet (262 b) of the fourth filter (262), and the fourth sampling line (263) is used for sampling and detecting the cadmium chloride mixed crystal hydrate solution in the finished product constant volume tank (25) through the communicated fourth filter (262), the fourth pump (261) and the finished product constant volume tank (25) so as to determine whether the content of crystal hydrate in the cadmium chloride mixed crystal hydrate solution in the finished product constant volume tank (25) meets the requirement or not;
the outlet (262 b) of the fourth filter (262) is also in controlled communication with the finished product constant volume tank (25) so as to return the cadmium chloride mixed crystal hydrate solution of the finished product constant volume tank (25) to the finished product constant volume tank (25) after the finished product constant volume tank (25) is failed in sampling detection through a fourth sampling line (263);
the outlet (262 b) of the fourth filter (262) is also controlled to be communicated with the tank body (211) of the mixing and stirring tank (21) so as to return the cadmium chloride mixed crystal hydrate solution of the finished product constant volume tank (25) to the tank body (211) of the mixing and stirring tank (21) after the sampling detection is failed through a fourth sampling line (263);
the PLC control operation station (4) is connected to the fourth pump (261) and the fourth filter (262) in a communication manner.
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