Centrifugal extraction device and method

Abstract

The invention provides a centrifugal extraction device and method.The centrifugal extraction device comprises a centrifugal machine, the centrifugal machine comprises a shell and a rotary drum arranged in the shell and used for being connected with a driving motor, a mixed material inlet is formed in the bottom of the shell and connected with an emulsifying and mixing unit, and the emulsifying and mixing unit is connected with an emulsifying and mixing unit; the emulsifying and mixing unit is used for emulsifying and mixing the light phase and the heavy phase and then feeding the mixture into the rotary drum for centrifugal separation; the emulsifying and mixing unit comprises a stator and a rotor, a feeding cylinder is arranged at the mixed material inlet, a fixing plate is mounted on the feeding cylinder, the stator is rotationally mounted on the fixing plate, a feeding hole is formed in the fixing plate, the rotor is rotationally and hermetically mounted at the mixture feeding hole, and the rotor is fixedly connected with the rotary drum; and a liquid inlet channel communicated with the interior of the rotary drum is arranged on the rotor. The device can effectively realize combination of emulsification extraction and centrifugal phase separation, extraction and phase separation are continuously carried out, and the technical problem of scale deposition in the phase separation process is effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of phosphoric acid treatment, and in particular to a centrifugal extraction device and method. Background Art

[0002] During the start-up process of wet purification phosphoric acid emulsification extraction, the stratification of the organic phase (solvent) and the inorganic phase is achieved by natural sedimentation in the phase separation tank. The emulsifier and the phase separation tank are connected by a pipeline, and the continuity of extraction and phase separation is not high. Since the mixed phase solution has a long overall residence time in the phase separation tank, especially the inorganic phase at the bottom of the container, the flow rate is slow. The slow flow rate makes it easy for scale to accumulate at the bottom of the tank, which is difficult to clean after scaling, and the cleaning safety risk is high.

[0003] In the prior art, the extraction of wet purified phosphoric acid is similar to the emulsification extraction technology, and there is also micro-reaction extraction. Micro-reaction extraction is similar to emulsification extraction, and extraction and phase separation are two independent units, which cannot meet the requirements of continuity and not easy to settle and foul.

[0004] The current emulsification extraction has the following shortcomings:

[0005] First, the phase separation residence time after extraction is too long, and the solvent causes fouling;

[0006] Second, cleaning after fouling takes a long time and has high safety risks;

[0007] Third, if the scale is not cleaned for a long time, the volume of the phase separation tank will become smaller, reducing the extraction rate. If it is cleaned frequently, the start-up rate will be low and the consumption will be high. Summary of the invention

[0008] The object of the present invention is to provide a centrifugal extraction device and method, which can effectively realize the combination of emulsified extraction and centrifugal phase separation, and the extraction and phase separation are carried out continuously, which effectively solves the technical problem of fouling during the phase separation process and improves the emulsified extraction and phase separation effect and efficiency.

[0009] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0010] A centrifugal extraction device, comprising a centrifuge, the centrifuge comprising a housing, a drum arranged inside the housing and connected to a driving motor, a mixed material inlet arranged at the bottom of the housing, the mixed material inlet connected to an emulsifying and mixing unit, the emulsifying and mixing unit being used to emulsify and mix a light phase and a heavy phase and then enter the drum for centrifugal separation;

[0011] The emulsifying and mixing unit comprises a stator and a rotor, a feed cylinder is provided at the inlet of the mixed material, a fixed plate is installed on the feed cylinder, the stator is rotatably installed on the fixed plate, a feed hole is provided on the fixed plate, the rotor is rotatably sealed and installed at the feed inlet of the mixed material, and the rotor is fixedly connected to the drum; a liquid inlet channel communicating with the inside of the drum is provided on the rotor;

[0012] After the light phase and the heavy phase enter the feed barrel, they are mixed and emulsified in the emulsifying and mixing unit, and then enter the drum from the liquid inlet channel for centrifugal phase separation.

[0013] Wherein, a rotating sealing ring is arranged between the rotor and the housing.

[0014] Furthermore, the rotor includes a rotor body and a connecting part, the connecting part is fixedly connected to the rotor body, the feed channel is arranged in the connecting part, the connecting part is fixedly connected to the drum, and a liquid outlet hole is arranged on a side of the connecting part.

[0015] Preferably, there are multiple liquid outlet holes, and they are evenly arranged on the side of the connecting part.

[0016] Furthermore, a flange is provided at the upper end of the feed barrel, and the feed barrel is fixedly connected to the shell through the flange.

[0017] Among them, the rotor and the stator are multi-stage.

[0018] A centrifugal extraction method, the specific method is as follows:

[0019] Step 1: Adding an empty extraction solvent and phosphoric acid into the feed barrel;

[0020] Step 2: The emulsification and mixing unit performs strong emulsification and mixing on the empty extraction solvent and phosphoric acid;

[0021] Step 3: After the strong emulsification and mixing in step 3, the unloaded extraction solvent and phosphoric acid enter the drum for high-speed centrifugal phase separation, and the residual acid is discharged from the heavy phase outlet on the shell along the wall; the loaded solvent is discharged from the light phase outlet along the rotating shaft inside the drum.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] In actual use, the present invention adds an empty extraction solvent and phosphoric acid into the feed barrel, and the emulsification mixing unit strongly emulsifies and mixes the empty extraction solvent and phosphoric acid. The empty extraction solvent and phosphoric acid after strong emulsification mixing enter the drum for high-speed centrifugal phase separation, and the residual acid is discharged from the heavy phase outlet on the shell along the wall; the loaded solvent is discharged from the light phase outlet along the rotating shaft in the drum. The present invention combines emulsification with a centrifuge. Compared with traditional emulsification extraction, the extraction and phase separation can achieve continuity. Centrifugal extraction and centrifugal phase separation can greatly reduce the fouling of the phase separation equipment, reduce the cleaning workload and safety risks during cleaning, and more importantly, ensure the phase separation effect and avoid the influence of insufficient phase separation space on the extraction rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 It is a schematic diagram of the connection relationship between the emulsifying mixing unit and the shell of the present invention.

[0026] Figure 2 It is a schematic diagram of the overall structure of the present invention.

[0027] Figure 3 It is a schematic diagram of the connection relationship between the feed unit and the shell of the present invention.

[0028] Reference numerals:

[0029] 101 centrifuge, 102 shell, 103 drive motor, 104 drum, 105 mixed material inlet, 106 emulsification mixing unit, 107 stator, 108 rotor, 109 feed barrel, 110 fixed plate, 111 feed hole, 112 liquid inlet channel, 113 rotor body, 114 connecting part, 115 liquid outlet, 116 feed unit, 117 inner barrel, 118 outer barrel, 119 first feed pipe, 120 second feed pipe, 121 first injection head, 122 injection hole, 123 second injection head, 124 first tapered hole, 125 connecting hole, 126 second tapered hole, 127 mixing barrel, 128 first liquid inlet hole, 129 heavy phase outlet, 130 light phase outlet. DETAILED DESCRIPTION

[0030] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0031] In the description of the embodiments of the present invention, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0034] In the embodiments of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] The disclosure below provides many different embodiments or examples to implement different structures of the embodiments of the present invention. In order to simplify the disclosure of the embodiments of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present invention. In addition, the embodiments of the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0036] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0037] See also Figure 1-Figure 3 This embodiment discloses a centrifugal extraction device, including a centrifuge 101, wherein the centrifuge 101 includes a housing 102, a drum 104 disposed inside the housing 102 and connected to a driving motor 103, a mixed material inlet 105 is disposed at the bottom of the housing 102, and the mixed material inlet 105 is connected to an emulsifying and mixing unit 106, wherein the emulsifying and mixing unit is used to emulsify and mix the light phase and the heavy phase and then enter the drum 104 for centrifugal separation;

[0038] The emulsifying and mixing unit includes a stator 107 and a rotor 108. A feed barrel 109 is provided at the mixed material inlet 105. A fixed plate 110 is installed on the feed barrel 109. The stator 107 is rotatably installed on the fixed plate 110. The fixed plate 110 is provided with a feed hole 111. The rotor 108 is rotatably sealed and installed at the mixed material feed port, and the rotor 108 is fixedly connected to the drum 104. The rotor 108 is provided with a liquid inlet channel 112 that is connected to the inside of the drum 104.

[0039] After the light phase and the heavy phase enter the feed barrel 109, they are mixed and emulsified in the emulsifying and mixing unit, and then enter the drum 104 through the liquid inlet channel 112 for centrifugal phase separation.

[0040] In actual use, the present invention adds an empty extraction solvent and phosphoric acid into the feed barrel 109, and the emulsification and mixing unit strongly emulsifies and mixes the empty extraction solvent and phosphoric acid, and the empty extraction solvent and phosphoric acid after strong emulsification and mixing enter the drum 104 for high-speed centrifugal phase separation, and the raffinate is discharged from the heavy phase outlet 129 on the shell 102 along the wall; the loaded solvent is discharged from the light phase outlet 130 along the rotating shaft in the drum 104. The present invention combines emulsification with the centrifuge 101. Compared with traditional emulsification extraction, extraction and phase separation can achieve continuity, centrifugal extraction and centrifugal phase separation can greatly reduce the fouling of the phase separation equipment, reduce the cleaning workload and safety risks during cleaning, and more importantly, ensure the phase separation effect and avoid the influence of the extraction rate due to insufficient phase separation space.

[0041] The present application mainly realizes the combination of emulsification and centrifugation. An emulsification mixing unit 106 is set at the inlet of the centrifuge 101, so that the extracted material directly enters the centrifuge 101 for centrifugal separation, and the inorganic phase (heavy phase) passes through the outlet of the heavy liquid adjustable weir plate collecting chamber of the centrifuge 101 (heavy phase outlet 129) and is thrown out of the centrifuge 101, and the organic phase (light phase) passes through the discharge port of the adjustable weir plate collecting chamber (from the light phase outlet 130) and is discharged from the cylinder (shell).

[0042] In actual use, the emulsifying and mixing unit 106 adopts a stator 107 and a blade rotor 108 which are interlocked with each other, and the extraction is achieved after high-speed rotation and stirring. The rotor 108 is concentric with the rotating shaft of the centrifuge 101 drum 104, driving the centrifuge 101 to rotate to achieve centrifugal phase separation.

[0043] In actual use, a rotating sealing ring is provided between the rotor 108 and the housing to prevent the mixed material from entering the interior of the drum 104 through the gap.

[0044] The rotor 108 includes a rotor body 113 and a connecting portion 114, wherein the connecting portion 114 is fixedly connected to the rotor body 113, a feed channel is arranged in the connecting portion 114, the connecting portion 114 is fixedly connected to the drum 104, and a liquid outlet 115 is arranged on the side of the connecting portion 114. Such an arrangement can form an inner flow channel to ensure sufficient emulsification extraction of the mixed material.

[0045] Furthermore, there are multiple liquid outlet holes 115, which are evenly arranged on the side of the connecting portion 114. The centrifugal effect can be improved by discharging the material from the side.

[0046] Among them, a flange is provided at the upper end of the feed barrel 109, and the feed barrel 109 is fixedly connected to the shell 102 through the flange.

[0047] Furthermore, the rotor 108 and the stator 107 are multi-stage, and such an arrangement can improve the emulsification effect and the centrifugal effect.

[0048] This embodiment also discloses a centrifugal extraction method, the specific method is as follows:

[0049] Step 1: Adding an empty extraction solvent and phosphoric acid into the feed cylinder 109;

[0050] Step 2: The emulsification and mixing unit performs strong emulsification and mixing on the empty extraction solvent and phosphoric acid;

[0051] Step 3: After the strong emulsification and mixing in step 3, the unloaded extraction solvent and phosphoric acid enter the drum 104 for high-speed centrifugal phase separation, and the residual acid is discharged from the heavy phase outlet 129 on the shell 102 along the wall; the loaded solvent is discharged from the light phase outlet 130 along the rotating shaft inside the drum 104.

[0052] In some preferred implementation cases, a feeding unit 116 is arranged inside the feeding barrel 109, and the feeding unit 116 includes an inner barrel 117 and an outer barrel 118, the inner barrel 117 and the outer barrel 118 are coaxially arranged, and the inner barrel 117 is located inside the outer barrel 118, the outer barrel 118 is connected to a first feeding pipe 119, the first feeding pipe 119 extends out of the feeding barrel 109, the inner barrel 117 is connected to a second feeding pipe 120, the second feeding pipe 120 passes through the outer barrel 118 and then extends out of the feeding barrel 109, and a flow channel is formed between the inner barrel 117 and the outer barrel 118; a first injection head 121 is arranged at the end of the inner barrel 117, and the first injection head 121 has an injection hole 122 with a gradually decreasing inner diameter;

[0053] A second injection head 123 is connected to the end of the outer cylinder 118 , and is provided with a first conical hole 124 , a connecting hole 125 and a second conical hole 126 which are interconnected. The injection hole 122 is opposite to the connecting hole 125 , and the outlet port diameter of the injection hole 122 is smaller than the diameter of the connecting hole 125 .

[0054] In this way, in actual use, the light phase and the heavy phase enter from the first feed pipe 119 and the second feed pipe 120 respectively, and achieve the purpose of mobile mixing when flowing through the first injection head 121 and the second injection head 123, while ensuring continuous feeding and achieving preliminary emulsification mixing. Due to the provision of the injection hole 122, the first conical hole 124, the connecting hole 125 and the second conical hole 126, the light phase and the heavy phase can be preliminarily emulsified and mixed when moving, and the mixing ratio can also be adjusted at the feeding unit 116.

[0055] Furthermore, in some preferred implementation cases, the end of the second injection head 123 is connected to a mixing barrel 127, which is large at both ends and small in the middle, and a first liquid inlet hole 128 is provided at the upper end of the mixing barrel 127. The mixed material injected from the second conical hole 126 will directly enter the mixing barrel 127; the material is preliminarily mixed at the first injection head 121, mixed again at the second injection head 123, and three emulsification mixing is achieved in the mixing barrel, thereby improving the mixing uniformity of the light phase and the heavy phase, and making the emulsification mixing effect in the emulsification mixing unit 106 better.

[0056] In the mixing barrel 127, the material in the feeding barrel 109 can enter the mixing barrel again from the first liquid inlet hole 128 to achieve the purpose of cyclic mixing.

[0057] In actual use, the first injection head 121 is connected to the inner tube 117 through threads, and the second injection head 123 is connected to the outer tube 118 through threads.

[0058] In actual use, a discharge valve is provided at the bottom of the feed barrel 109 to facilitate the discharge of residual materials.

[0059] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A centrifugal extraction device, comprising a centrifuge, wherein the centrifuge comprises a housing, a drum disposed inside the housing and connected to a drive motor, characterized in that: A mixed material inlet is provided at the bottom of the shell, and the mixed material inlet is connected to an emulsifying and mixing unit, and the emulsifying and mixing unit is used to emulsify and mix the light phase and the heavy phase and then enter the inside of the drum for centrifugal separation; The emulsifying and mixing unit comprises a stator and a rotor, a feed cylinder is provided at the inlet of the mixed material, a fixed plate is installed on the feed cylinder, the stator is rotatably installed on the fixed plate, a feed hole is provided on the fixed plate, the rotor is rotatably sealed and installed at the feed inlet of the mixed material, and the rotor is fixedly connected to the drum; a liquid inlet channel communicating with the inside of the drum is provided on the rotor; After the light phase and the heavy phase enter the feed barrel, they are mixed and emulsified in the emulsifying and mixing unit, and then enter the drum from the liquid inlet channel for centrifugal phase separation.

2. A centrifugal extraction device according to claim 1, characterized in that: A rotating sealing ring is arranged between the rotor and the housing.

3. A centrifugal extraction device according to claim 1, characterized in that: The rotor comprises a rotor body and a connecting part, wherein the connecting part is fixedly connected to the rotor body, a feed channel is arranged in the connecting part, the connecting part is fixedly connected to the drum, and a liquid outlet hole is arranged on a side of the connecting part.

4. A centrifugal extraction device according to claim 3, characterized in that: There are multiple liquid outlet holes, which are evenly arranged on the side of the connecting part.

5. A centrifugal extraction device according to claim 3, characterized in that: A flange is arranged on the upper end of the feed barrel, and the feed barrel is fixedly connected to the shell through the flange.

6. A centrifugal extraction device according to claim 1, characterized in that: The rotor and stator are multi-stage.

7. A centrifugal extraction method, characterized in that: The method comprises using the centrifugal extraction device according to any one of claims 1 to 6, wherein the specific method is as follows: Step 1: Adding an empty extraction solvent and phosphoric acid into the feed barrel; Step 2: The emulsification and mixing unit performs strong emulsification and mixing of the empty extraction solvent and phosphoric acid; Step 3: After the strong emulsification and mixing in step 3, the empty extraction solvent and phosphoric acid enter the drum for high-speed centrifugal phase separation, and the residual acid is discharged from the heavy phase outlet on the shell along the wall; The loaded solvent is discharged from the light phase outlet along the rotating axis in the drum.

Images