An apparatus for preparing cryolite from high-concentration fluoride-containing wastewater

Abstract

This utility model relates to an apparatus for preparing cryolite using high-concentration fluoride-containing wastewater, comprising a calcium hydroxide mixing tank, a sodium aluminate mixing tank, a sodium hydroxide storage tank, and a fluoride-containing wastewater storage tank. The calcium hydroxide mixing tank is equipped with a calcium hydroxide output pipeline connected to a secondary crystallization system and a wastewater treatment system. The sodium aluminate mixing tank is equipped with a sodium aluminate output pipeline connected to a primary crystallization system and a secondary crystallization system. The sodium hydroxide storage tank is equipped with a sodium hydroxide output pipeline connected to the primary crystallization system, the secondary crystallization system, and the wastewater treatment system. The fluoride-containing wastewater storage tank is equipped with a fluoride-containing wastewater output pipeline connected to the primary crystallization system. The liquid phase output from the primary crystallization system is connected to the secondary crystallization system, and the liquid phase output from the secondary crystallization system is connected to the wastewater treatment system. This apparatus facilitates the conversion of fluoride ions into byproducts for recycling, significantly reducing the subsequent hazardous (solid) waste treatment volume.

Description

Technical Field

[0001] This utility model relates to an apparatus for preparing cryolite using high-concentration fluoride-containing wastewater. Background Technology

[0002] Currently, the main treatment methods for fluoride-containing wastewater (of different concentrations) include chemical precipitation, flocculation precipitation, adsorption, reverse osmosis, electrodialysis, and ion exchange. However, each treatment method has its limitations when dealing with different concentrations of fluoride ions.

[0003] Traditional methods for treating fluoride-containing wastewater mainly involve converting fluoride ions from the liquid phase to the solid phase through chemical (precipitation) and physical (adsorption) processes, thus generating hazardous waste. However, these methods suffer from drawbacks such as low recovery rates and large volumes of hazardous waste. Examples include chemical precipitation, flocculation precipitation, and adsorption. Other technologies also have disadvantages such as high energy consumption, high investment costs, and limitations in handling fluoride concentrations, including reverse osmosis, electrodialysis, and ion exchange. Utility Model Content

[0004] The purpose of this invention is to provide a device for preparing cryolite using high-concentration fluoride-containing wastewater. This device helps to convert F ions into by-products for recycling and treatment, which can greatly reduce the amount of subsequent hazardous (solid) waste to be treated.

[0005] The technical solution of this utility model is as follows: an apparatus for preparing cryolite using high-concentration fluoride-containing wastewater, comprising a calcium hydroxide mixing tank, a sodium aluminate mixing tank, a sodium hydroxide storage tank, and a fluoride-containing wastewater storage tank. The calcium hydroxide mixing tank is provided with a calcium hydroxide output pipeline connected to a secondary crystallization system and a wastewater treatment system. The sodium aluminate mixing tank is provided with a sodium aluminate output pipeline connected to a primary crystallization system and a secondary crystallization system. The sodium hydroxide storage tank is provided with a sodium hydroxide output pipeline connected to the primary crystallization system, the secondary crystallization system, and the wastewater treatment system. The fluoride-containing wastewater storage tank is provided with a fluoride-containing wastewater output pipeline connected to the primary crystallization system. The liquid phase output from the primary crystallization system is connected to the secondary crystallization system, and the liquid phase output from the secondary crystallization system is connected to the wastewater treatment system.

[0006] Furthermore, the top of the calcium hydroxide mixing tank is provided with a first industrial water inlet pipe, the inside of the calcium hydroxide mixing tank is provided with a stirring structure, one end of the calcium hydroxide output pipeline is connected to the bottom of the calcium hydroxide mixing tank, and the calcium hydroxide output pipeline is provided with a calcium hydroxide circulating discharge pump and a calcium hydroxide return pipeline connected to the top of the calcium hydroxide mixing tank.

[0007] Furthermore, the top of the sodium aluminate mixing tank is provided with a second industrial water inlet pipe and a first steam inlet pipe. The sodium aluminate mixing tank is provided with a stirring structure. One end of the sodium aluminate output pipe is connected to the bottom of the sodium aluminate mixing tank. The sodium aluminate output pipe is provided with a sodium aluminate circulating discharge pump and a sodium aluminate return pipe connected to the top of the sodium aluminate mixing tank.

[0008] Furthermore, the sodium hydroxide output pipeline is connected to the bottom of the sodium hydroxide storage tank, and a sodium hydroxide discharge pump is installed on the sodium hydroxide output pipeline.

[0009] Furthermore, one end of the fluoride-containing wastewater output pipeline is connected to the bottom of the fluoride-containing wastewater storage tank, and a fluoride-containing wastewater discharge pump is installed on the fluoride-containing wastewater output pipeline.

[0010] Furthermore, the primary crystallization system includes a primary crystallization tank with an internal stirring structure, a second steam inlet pipe at the top of the primary crystallization tank, a primary centrifuge connected to the bottom of the primary crystallization tank via a pipe, a fixed material outlet of the primary centrifuge, a primary centrifugal liquid storage tank connected to the liquid outlet of the primary centrifuge via a pipe, a primary centrifugal liquid output pipe connected to the secondary crystallization system, and a primary centrifugal discharge pump installed on the primary centrifugal liquid output pipe.

[0011] Furthermore, the secondary crystallization system includes a secondary crystallization tank with an internal stirring structure, a third steam inlet pipe at the top of the secondary crystallization tank, a secondary centrifuge connected to the bottom of the secondary crystallization tank via a pipeline, a fixed material outlet of the secondary centrifuge, a secondary centrifugal liquid storage tank connected to the liquid outlet of the secondary centrifuge via a pipeline, a secondary centrifugal liquid output pipeline connected to a wastewater treatment system, and a secondary centrifugal discharge pump installed on the secondary centrifugal liquid output pipeline.

[0012] Furthermore, the wastewater treatment system includes a calcium fluoride precipitation tank with an internal stirring structure. The top of the calcium fluoride precipitation tank is equipped with a fourth steam inlet pipe, and the bottom of the calcium fluoride precipitation tank is connected to a calcium fluoride centrifuge via a pipeline. The calcium fluoride centrifuge is equipped with a solid waste outlet, and the liquid phase outlet of the calcium fluoride centrifuge is connected to a qualified wastewater storage tank via a pipeline.

[0013] Furthermore, the qualified wastewater storage tank is equipped with an external discharge pipeline with a qualified wastewater discharge pump.

[0014] Furthermore, both the liquid phase output pipeline of the primary crystallization system and the liquid phase output pipeline of the secondary crystallization system are provided with external discharge branches.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. Based on the principle of chemical precipitation, this device is designed to recover and treat fluoride-containing wastewater of different concentrations (up to 10%) generated during the production and operation of hydrofluoric acid and the use of gas and liquid. It converts F ions into by-products for recycling, which can not only greatly reduce the amount of subsequent hazardous (solid) waste to be treated and reduce warehouse inventory, but also create additional economic value.

[0017] 2. This device treats fluoride-containing wastewater of different concentrations through multiple crystallization reactions and centrifugal filtration; it also helps to reduce the cost of fluoride-containing wastewater treatment.

[0018] 3. This device can treat low-concentration fluoride wastewater within the range of 5000ppm; while existing similar treatment processes require fluoride wastewater to be above 10000ppm, otherwise the crystallization effect is poor. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a partial enlargement of the present invention. Figure 1 ;

[0021] Figure 3 This is a partial enlargement of the present invention. Figure 2 ;

[0022] In the diagram: 1-Calcium hydroxide mixing tank; 101-Calcium hydroxide output pipeline; 102-Calcium hydroxide return pipeline; 2-Calcium hydroxide circulating discharge pump; 3-Sodium aluminate mixing tank; 301-Sodium aluminate output pipeline; 302-Sodium aluminate return pipeline; 4-Sodium aluminate circulating discharge pump; 5-Sodium hydroxide storage tank; 501-Sodium aluminate output pipeline; 6-Sodium hydroxide discharge pump; 7-Fluoride wastewater storage tank; 701-Fluoride wastewater output pipeline; 8-Fluoride wastewater discharge pump; 9-Primary crystallization tank; 10-Primary centrifuge; 11-Primary centrifuge liquid storage tank; 1101-Primary centrifuge liquid output pipeline; 1102- External discharge branch 12 - Primary centrifugal liquid discharge pump 13 - Secondary crystallization tank 14 - Secondary centrifuge 15 - Secondary centrifugal liquid storage tank 1501 - Secondary centrifugal liquid output pipeline 1502 - External discharge branch 16 - Secondary centrifugal liquid discharge pump 17 - Calcium fluoride precipitation kettle 18 - Calcium fluoride centrifuge 19 - Qualified wastewater storage tank 20 - Qualified wastewater external discharge pump 21 - External discharge pipeline A - Industrial water transmission pipeline A1 - First industrial water inlet pipe A2 - Second industrial water inlet pipe B - Steam transmission pipeline B1 - First steam inlet pipe B2 - Second steam inlet pipe B3 - Third steam inlet pipe B4 - Fourth steam inlet pipe Detailed Implementation

[0023] To make the above-mentioned features and advantages of this utility model more easily understood, specific embodiments are described below in conjunction with the accompanying drawings, but this utility model is not limited thereto.

[0024] refer to Figures 1 to 3

[0025] An apparatus for preparing cryolite using high-concentration fluoride-containing wastewater includes a calcium hydroxide mixing tank 1, a sodium aluminate mixing tank 3, a sodium hydroxide storage tank 5, and a fluoride-containing wastewater storage tank 7. The calcium hydroxide mixing tank 1 is equipped with a calcium hydroxide output pipeline 101 connected to a secondary crystallization system and a wastewater treatment system. The sodium aluminate mixing tank 3 is equipped with a sodium aluminate output pipeline 301 connected to a primary crystallization system and a secondary crystallization system. The sodium hydroxide storage tank 5 is equipped with a sodium hydroxide output pipeline 501 connected to the primary crystallization system, the secondary crystallization system, and the wastewater treatment system. The fluoride-containing wastewater storage tank 7 is equipped with a fluoride-containing wastewater output pipeline 701 connected to the primary crystallization system. The liquid phase output from the primary crystallization system is connected to the secondary crystallization system, and the liquid phase output from the secondary crystallization system is connected to the wastewater treatment system.

[0026] In this embodiment, the top of the calcium hydroxide mixing tank 1 is provided with a first industrial water inlet pipe A1 connected to the industrial water conveying pipeline A. The calcium hydroxide mixing tank 1 is equipped with a motor-driven stirring structure. One end of the calcium hydroxide output pipeline 101 is connected to the bottom of the calcium hydroxide mixing tank 1. The calcium hydroxide output pipeline 101 is equipped with a calcium hydroxide circulating discharge pump 2 and a calcium hydroxide return pipeline 102 connected to the top of the calcium hydroxide mixing tank 1. The calcium hydroxide solution can be circulated for later use through the calcium hydroxide circulating discharge pump 2 and the calcium hydroxide return pipeline 102.

[0027] In this embodiment, the top of the sodium aluminate mixing tank 3 is equipped with a second industrial water inlet pipe A2 connected to the industrial water conveying pipeline A and a first steam inlet pipe B1 connected to the steam conveying pipeline B. The sodium aluminate mixing tank 3 is equipped with a motor-driven stirring structure. One end of the sodium aluminate output pipeline 301 is connected to the bottom of the sodium aluminate mixing tank 3. The sodium aluminate output pipeline 301 is equipped with a sodium aluminate circulating discharge pump 4 and a sodium aluminate return pipeline 302 connected to the top of the sodium aluminate mixing tank. The sodium aluminate solution can be circulated for later use through the sodium aluminate circulating discharge pump 4 and the sodium aluminate return pipeline 302.

[0028] In this embodiment, the sodium hydroxide output pipeline 501 is connected to the bottom of the sodium hydroxide storage tank 5, and a sodium hydroxide discharge pump 6 is installed on the sodium hydroxide output pipeline 501.

[0029] In this embodiment, one end of the fluoride-containing wastewater output pipeline 701 is connected to the bottom of the fluoride-containing wastewater storage tank 7, and a fluoride-containing wastewater discharge pump 8 is installed on the fluoride-containing wastewater output pipeline 701.

[0030] In this embodiment, the primary crystallization system includes a primary crystallization tank 9 whose top is connected to a sodium aluminate output pipeline 301, a sodium hydroxide output pipeline 501, and a fluoride-containing wastewater output pipeline 701. The primary crystallization tank 9 is equipped with a motor-driven stirring structure. A second steam inlet pipe B2, connected to a steam conveying pipeline B, is located at the top of the primary crystallization tank 9. A primary centrifuge 10 is connected to the bottom of the primary crystallization tank 9 via a pipeline. The primary centrifuge 10 has a fixed material outlet to discharge the solid material after solid-liquid separation—a byproduct: cryolite. The liquid phase outlet of the primary centrifuge 10 is connected to a primary centrifuge liquid storage tank 11 via a pipeline. The primary centrifuge liquid storage tank 11 has a primary centrifuge liquid output pipeline 1101 connected to the secondary crystallization system. A primary centrifuge discharge pump 12 is installed on the primary centrifuge liquid output pipeline 1101 to send the liquid from the primary centrifugation into the secondary crystallization system.

[0031] In this embodiment, the secondary crystallization system includes a secondary crystallization tank 13 whose top is connected to a calcium hydroxide output pipeline 101, a sodium aluminate output pipeline 301, a sodium hydroxide output pipeline 501, and a primary centrifugal liquid output pipeline 1101. The top of the secondary crystallization tank 13 is also provided with a third steam inlet pipe B3 connected to a steam conveying pipeline B. The secondary crystallization tank 13 is provided with a steam output structure connected to the third steam inlet pipe B3 and a stirring structure driven by a motor. The bottom of the secondary crystallization tank 13 is connected to a secondary centrifuge 14 via a pipeline. The secondary centrifuge 14 is provided with a fixed material outlet to discharge the solid material after solid-liquid separation—byproduct: cryolite. The liquid outlet of the secondary centrifuge 14 is connected to a secondary centrifuge liquid storage tank 15 via a pipeline. The secondary centrifuge liquid storage tank 15 is equipped with a secondary centrifuge liquid output pipeline 1501 connected to the wastewater treatment system. A secondary centrifuge discharge pump 16 is installed on the secondary centrifuge liquid output pipeline 1501 to send the liquid from the secondary centrifuge into the wastewater treatment system.

[0032] In this embodiment, the wastewater treatment system includes a calcium fluoride precipitation tank 17 connected at the top to a calcium hydroxide output pipeline 101, a sodium hydroxide output pipeline 501, and a secondary centrifugal liquid output pipeline 1501. The top of the calcium fluoride precipitation tank 17 is equipped with a fourth steam inlet pipe B4 connected to a steam conveying pipeline B. The calcium fluoride precipitation tank 17 has a steam output structure connected to the fourth steam inlet pipe B4, and a stirring structure driven by a motor. The bottom of the calcium fluoride precipitation tank 17 is connected via a pipeline to a calcium fluoride centrifuge 18, which has a solid waste outlet for discharging calcium fluoride. The liquid phase outlet of the calcium fluoride centrifuge 18 is connected via a pipeline to a qualified wastewater storage tank 19, which is equipped with an external discharge pipeline 21 equipped with a qualified wastewater discharge pump 20.

[0033] In this embodiment, the primary centrifugal liquid output pipeline is further provided with an external discharge branch 1102, and the secondary centrifugal liquid output pipeline is further provided with an external discharge branch 1502.

[0034] The method for treating high-concentration fluoride-containing wastewater using this device is as follows:

[0035] (1) Ingredients:

[0036] Sufficient industrial water is added to both the calcium hydroxide mixing tank 1 and the sodium aluminate mixing tank 3. Steam is then introduced into the sodium aluminate mixing tank 3 to raise its temperature and increase its solubility. Once the temperature of the sodium aluminate mixing tank 3 reaches 50-60℃, solid lime and sodium aluminate are added to both tanks. The mass ratio of solid lime to industrial water is 10-15%, and the mass ratio of sodium aluminate to industrial water is 8-12%. After the mixing is completed, the internal circulation pumps 2 (calcium hydroxide) and 4 (sodium aluminate) are started for later use.

[0037] (2) Crystallization in one reaction:

[0038] After the batching is completed, sodium aluminate and high-concentration fluoride-containing wastewater from the sodium aluminate batching tank 3 and the fluoride-containing wastewater storage tank 7 are sequentially pumped into the primary crystallization tank 9 through the sodium aluminate circulating discharge pump 4 and the fluoride-containing wastewater discharge pump 8. The pumping ratio is 1:5.5~6 (this ratio is based on 10000 ppm F). - (Concentration), stop feeding when the liquid level in the primary crystallization tank 9 reaches 70-80%. Control the opening of the steam valve to keep the temperature of the primary crystallization tank 9 at 50-60℃. During the process, based on the pH value measured in the primary crystallization tank 9, pump the alkaline material (sodium hydroxide) from the sodium hydroxide storage tank 5 to the primary crystallization tank 9 through the sodium hydroxide discharge pump 6, keep the pH within 3.5-5, and allow the reaction to proceed for 6-12 hours.

[0039] After the reaction is completed, the solid and liquid materials from the primary crystallizer 9 are discharged through a pipeline to the primary centrifuge 10 for solid-liquid separation. The separated solid material—byproduct: cryolite—is dried and packaged; the liquid enters the primary centrifuge liquid storage tank 11 and is transported to the secondary crystallizer 13 through the primary centrifuge discharge pump 12.

[0040] (3) Secondary reaction crystallization:

[0041] As above, after the reaction in the secondary crystallization tank 13, the solid and liquid are separated by the secondary centrifuge 14. The solid material after solid-liquid separation—the by-product: cryolite—is dried and packaged. The liquid enters the secondary centrifugal liquid storage tank 15 and is then transported to the calcium fluoride precipitation tank 17 by the secondary centrifugal discharge pump 16.

[0042] (4) Wastewater treatment to meet standards:

[0043] After the material undergoes primary and secondary crystallization reactions (fluoride ion concentration < 500 ppm), it enters the calcium fluoride precipitation tank 17. The calcium hydroxide batching tank 1 then pumps the material to the calcium fluoride precipitation tank 17 via the calcium hydroxide discharge pump 2 for precipitation reaction, ensuring pH ≥ 12. After a reaction time of 3-4 hours, the material is discharged through a pipeline into the calcium fluoride centrifuge 18 for solid-liquid separation. The solid phase-calcium fluoride precipitate is treated as hazardous waste, while the separated liquid phase is discharged into the qualified wastewater storage tank 19 and then discharged externally via the qualified wastewater discharge pump 20.

[0044] If the terms "first" and "second" are used in the above description to define the components, those skilled in the art should know that the use of "first" and "second" is only for the convenience of distinguishing the components in the description. Unless otherwise stated, the above terms have no special meaning.

[0045] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws) or a non-detachable fixed connection (e.g., riveting or welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured using a casting process) (except where it is obviously impossible to use an integral forming process).

[0046] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model above include states or shapes that are similar to, close to, or approximate with them.

[0047] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0048] The above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the patent application of the present utility model shall be covered by the present utility model.

Claims

1. An apparatus for preparing cryolite using high-concentration fluoride-containing wastewater, comprising a calcium hydroxide mixing tank, a sodium aluminate mixing tank, a sodium hydroxide storage tank, and a fluoride-containing wastewater storage tank, characterized in that, The calcium hydroxide mixing tank is equipped with a calcium hydroxide output pipeline connected to the secondary crystallization system and the wastewater treatment system. The sodium aluminate mixing tank is equipped with a sodium aluminate output pipeline connected to the primary crystallization system and the secondary crystallization system. The sodium hydroxide storage tank is equipped with a sodium hydroxide output pipeline connected to the primary crystallization system, the secondary crystallization system, and the wastewater treatment system. The fluoride-containing wastewater storage tank is equipped with a fluoride-containing wastewater output pipeline connected to the primary crystallization system. The liquid phase output from the primary crystallization system is connected to the secondary crystallization system, and the liquid phase output from the secondary crystallization system is connected to the wastewater treatment system.

2. The device for preparing cryolite using high-concentration fluorine-containing wastewater according to claim 1, characterized by, The top of the calcium hydroxide mixing tank is equipped with a first industrial water inlet pipe, and the inside of the calcium hydroxide mixing tank is equipped with a stirring structure. One end of the calcium hydroxide output pipeline is connected to the bottom of the calcium hydroxide mixing tank, and the calcium hydroxide output pipeline is equipped with a calcium hydroxide circulating discharge pump and a calcium hydroxide return pipeline connected to the top of the calcium hydroxide mixing tank.

3. The device for preparing cryolite using high-concentration fluorine-containing wastewater according to claim 1 or 2, characterized in that, The sodium aluminate mixing tank is equipped with a second industrial water inlet pipe and a first steam inlet pipe at the top. The sodium aluminate mixing tank is equipped with a stirring structure. One end of the sodium aluminate output pipe is connected to the bottom of the sodium aluminate mixing tank. The sodium aluminate output pipe is equipped with a sodium aluminate circulating discharge pump and a sodium aluminate return pipe connected to the top of the sodium aluminate mixing tank.

4. The device for preparing cryolite using high-concentration fluorine-containing wastewater according to claim 1, characterized in that, The sodium hydroxide output pipeline is connected to the bottom of the sodium hydroxide storage tank, and a sodium hydroxide discharge pump is installed on the sodium hydroxide output pipeline.

5. The device for preparing cryolite using high-concentration fluorine-containing wastewater according to claim 1 or 4, characterized in that, One end of the fluoride-containing wastewater output pipeline is connected to the bottom of the fluoride-containing wastewater storage tank, and a fluoride-containing wastewater discharge pump is installed on the fluoride-containing wastewater output pipeline.

6. The apparatus for preparing cryolite from high-concentration fluoride-containing wastewater according to claim 1, characterized in that, The primary crystallization system includes a primary crystallization tank with an internal stirring structure. A second steam inlet pipe is provided at the top of the primary crystallization tank, and a primary centrifuge is connected to the bottom of the primary crystallization tank via a pipeline. The primary centrifuge is provided with a fixed material outlet, and the liquid phase outlet of the primary centrifuge is connected to a primary centrifugal liquid storage tank via a pipeline. The primary centrifugal liquid storage tank is provided with a primary centrifugal liquid output pipeline connected to the secondary crystallization system, and a primary centrifugal discharge pump is provided on the primary centrifugal liquid output pipeline.

7. The device for producing cryolite using high-concentration fluorine-containing wastewater according to claim 1, 2, 4 or 6, characterized by, The secondary crystallization system includes a secondary crystallization tank with an internal stirring structure. A third steam inlet pipe is installed at the top of the secondary crystallization tank, and a secondary centrifuge is connected to the bottom of the secondary crystallization tank via a pipeline. The secondary centrifuge has a fixed material outlet, and the liquid phase outlet of the secondary centrifuge is connected to a secondary centrifugal liquid storage tank via a pipeline. The secondary centrifugal liquid storage tank is equipped with a secondary centrifugal liquid output pipeline connected to a wastewater treatment system, and a secondary centrifugal discharge pump is installed on the secondary centrifugal liquid output pipeline.

8. The device for producing cryolite using high-concentration fluorine-containing wastewater according to claim 1, 2, 4 or 6, characterized by, The wastewater treatment system includes a calcium fluoride precipitation tank with an internal stirring structure. The top of the calcium fluoride precipitation tank is equipped with a fourth steam inlet pipe, and the bottom of the calcium fluoride precipitation tank is connected to a calcium fluoride centrifuge via a pipeline. The calcium fluoride centrifuge is equipped with a solid waste outlet, and the liquid phase outlet of the calcium fluoride centrifuge is connected to a qualified wastewater storage tank via a pipeline.

9. The device for producing cryolite using high-concentration fluorine-containing wastewater according to claim 8, characterized by The qualified wastewater storage tank is equipped with an external discharge pipeline with a qualified wastewater discharge pump.

10. The device for producing cryolite using high-concentration fluorine-containing wastewater according to claim 1, 2, 4, 6 or 9, characterized by, Both the liquid phase output pipeline of the primary crystallization system and the liquid phase output pipeline of the secondary crystallization system are equipped with external drainage branches.

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