Continuous leaching device for crude barium sulfide

Abstract

The utility model discloses a continuous leaching device for crude barium sulfide. The continuous leaching device comprises a feeding system, an auger leaching system, a clarifying and washing system and a deslagging system, the feeding system, the auger leaching system, the clarifying and washing system and the deslagging system are sequentially connected, the feeding system is used for conveying coarse barium to the auger leaching system, the coarse barium in the auger leaching system is mixed with production return water injected into the auger leaching system, first leaching is completed, and a coarse barium sulfide solution is obtained; the crude barium sulfide solution enters the clarifying and washing system, the crude barium sulfide solution is subjected to continuous multiple clarification and washing in the clarifying and washing system to complete secondary leaching, and finished brine and sludge are obtained; the finished marinating liquid is fed into a finished product tank, and the slag sludge is discharged through the slag discharging system. And the extraction rate of barium sulfide is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the production of barium salt, in particular to a continuous leaching device for crude barium sulfide in the production of barium sulfate, barium carbonate and other barium salt. BACKGROUND

[0002] In the production process of barium sulfate, barium carbonate and other barium salt, barite is first calcined to produce crude barium sulfide (referred to as "crude barium"). The content of barium sulfide in crude barium varies depending on the grade of barite, usually between 45-75%. The soluble barium sulfide in crude barium needs to be extracted to become qualified barium sulfide solution for subsequent production. The content and particle size of crude barium affect the extraction rate of barium sulfide leaching.

[0003] Currently, the leaching process of crude barium usually uses a leaching tank (referred to as tank) for leaching. This method is to set a liquid outlet pipe at the bottom of the tank, and support the filter layer above the screen with fixed supports. Crude barium is poured onto the filter layer, and the tank should not be filled with crude barium, leaving a certain space above the tank. Then hot water is poured into the tank, and after the tank is filled with water, it is soaked for a certain period of time. Then the halogen discharge gate is opened, and the barium sulfide brine (also known as "yellow water") is discharged. The tank is manually fed, and the advanced one is mechanically fed. After the leaching is completed, the slag is discharged by excavator, and the advanced one is mechanically discharged.

[0004] The above-mentioned tank leaching has many disadvantages: 1. The production is intermittent operation, and the consistency of the barium sulfide solution is poor; 2. The labor intensity of workers is high; 3. The operating environment is poor, the temperature is high in summer, and it is easy to get heatstroke; although the temperature is low in winter, the visibility is poor due to the diffusion of steam in the workshop, and safety accidents are easy to occur.

[0005] The prior art CN220294161U discloses a barium sulfide black ash leaching device and a continuous leaching production system. The barium sulfide black ash leaching device is rotated in a closed space by a spiral blade with holes for leaching. The continuous feeding and slag discharge are realized by the inlet and outlet, and the steam outlet is provided to facilitate the collection and treatment of tail gas, which can be connected to the absorption system. The production system using the leaching device can realize continuous leaching, continuous absorption of waste gas, and filtration of brine. This prior art has the following problems: the crude barium and the brine in the leaching device cannot be fully mixed, and the material slag after the leaching device is filtered by a belt filter and discharged as waste. This method cannot completely leach the barium sulfide in the material slag, and the waste still contains a large amount of unextracted barium sulfide, causing waste. CONTENT OF THE INVENTION

[0006] In view of the defects of the prior art, the present application provides a continuous leaching device for crude barium sulfide.

[0007] A continuous leaching apparatus for crude barium sulfide includes a feeding system, a screw conveyor leaching system, a clarification and washing system, and a slag discharge system. The feeding system, screw conveyor leaching system, clarification and washing system, and slag discharge system are connected sequentially. The feeding system transports crude barium to the screw conveyor leaching system, where the crude barium is mixed with recycled production water injected into the screw conveyor leaching system to complete the first leaching, obtaining a crude barium sulfide solution. The crude barium sulfide solution then enters the clarification and washing system, where it undergoes multiple clarification and washing processes to complete a second leaching, obtaining a finished brine and sludge. The finished brine is sent to a finished product tank, and the sludge is discharged through the slag discharge system.

[0008] Optionally, the feeding system includes a coarse barium feeding auger and a ball mill. The coarse barium feeding auger is connected to the inlet of the ball mill, and a coarse barium feeding hopper is provided on the coarse barium feeding auger. The outlet of the ball mill is connected to the auger leaching system via a feed chute. A dilute brine inlet is installed at the inlet of the ball mill, and the dilute brine comes from the clarification and washing system. The particle size of the ball mill is 6-10 mesh, with a residue of 1-5%. The auger leaching system consists of multiple interconnected leaching augers. The feed inlet of the first leaching auger is connected to the feed chute. A liquid inlet is provided on the second-to-last leaching auger, and the production return water is injected through the liquid inlet of the second-to-last leaching auger. The last leaching auger is a slag-removing auger, on which a tap water spray pipe is installed. The clarification and washing system contains multiple interconnected clarification and washing units, each of which... The unit comprises interconnected continuous clarification tanks and mud mixing and washing tanks, both equipped with stirring mechanisms. A first set of clarification and washing units is used to extract concentrated brine from the first continuous clarification tank, and a second set of clarification and washing units is used to supply grinding water to the feeding system from the second continuous clarification tank. Each of the multiple sets of clarification and washing units contains a mud mixing and washing tank for washing the mud to extract barium sulfide. During the mud washing process, the preceding clarification and washing unit uses diluted brine from the following set of clarification and washing units spaced apart from it. A main partition is provided between the multiple spiral blades of the leaching auger, and the main partition is vertically fixed to the auger shaft. A secondary partition is provided on the spiral blades of the auger, the diameter of which is smaller than the diameter of the main partition. The auger leaching system includes a feeding auger, the diameter of which gradually increases from the inlet end to the outlet end.

[0009] The beneficial effects of this new invention are as follows: It solves the problems of discontinuous leaching, unstable barium sulfide quality, and poor operating conditions. It achieves continuous leaching production, sealed leaching equipment, stable leaching indicators, and a more environmentally friendly leaching process. The screw conveyor leaching system uses multiple screw conveyors for continuous leaching. Baffles are added to the screw conveyors, dividing them into multiple segments, allowing for thorough mixing of crude barium and the leaching brine, thus improving the leaching rate. Furthermore, this invention includes a clarification and washing system, which continuously washes the slurry during the production process, thereby completely extracting barium sulfide from the slurry, improving the extraction rate of barium sulfide from waste slurry, and avoiding waste. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the continuous leaching device;

[0011] Figure 2 This is a schematic diagram of the immersion auger structure;

[0012] Figure 3 for Figure 2 Enlarged view of a section of the auger used for immersion extraction;

[0013] Figure 4 This is a schematic diagram of the immersion auger in Example 2;

[0014] Figure 5A This is a three-dimensional structural diagram of the immersion auger in Example 3;

[0015] Figure 5B This is a cross-sectional view of the immersion auger in Example 3;

[0016] Figure 6A This is a perspective view of the clarification and washing system in Example 4;

[0017] Figure 6B This is a top view of the clarification and washing system in Example 4;

[0018] Figure 6C This is a cross-sectional view of the clarification and washing system in Example 4. Detailed Implementation

[0019] To make the above-mentioned objects, features, and advantages of this invention more apparent and understandable, the specific embodiments of this invention will be described in detail below with reference to the accompanying drawings, making the above-mentioned and other objects, features, and advantages of this invention clearer. In all the drawings, the same reference numerals indicate the same parts. The drawings are not intentionally drawn to scale; the focus is on illustrating the main idea of ​​this invention.

[0020] It should be understood that the singular forms “a,” “an,” and “the” include plural objects unless the context explicitly indicates otherwise. Thus, for example, referring to a “module” includes referring to one or more such modules. The advantages and features of this invention, as well as methods of implementing it, can be more readily understood by referring to the detailed description and accompanying drawings of the embodiments below. However, this invention can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the concept of this invention to those skilled in the art.

[0021] This novel continuous leaching device for crude barium sulfide consists of a feeding system, a screw conveyor leaching system, a clarification and washing system, and a slag discharge system. These systems are connected sequentially. The feeding system transports crude barium to the screw conveyor leaching system, where it is continuously propelled forward by the rotating screw conveyor and mixed with injected production return water (low-concentration brine) to complete the first leaching, yielding a crude barium sulfide solution. This solution then enters the clarification and washing system, where it undergoes multiple clarification and washing processes to complete the second leaching, yielding a finished brine and sludge. The finished brine is then sent to a finished product tank, while the sludge is discharged through the slag discharge system.

[0022] Example 1

[0023] See Figure 1 The feeding system includes a crude barium feeding auger 1 and a ball mill 4. The crude barium feeding auger 1 is connected to the inlet 3 of the ball mill 4. A crude barium feeding bin 2 is installed on the crude barium feeding auger 1. The outlet 5 of the ball mill 4 is connected to the auger leaching system through a feed chute 6. The crude barium feeding bin 2 is located above the crude barium feeding auger 1. The crude barium feeding auger 1 is driven to rotate by a motor. The crude barium raw material in the crude barium feeding bin 2 falls onto the crude barium feeding auger 1 under the action of gravity, and enters the ball mill 4 under the action of the crude barium feeding auger 1. The ball mill 4 pulverizes the crude barium, and the pulverized crude barium enters the auger leaching system through the feed chute 6.

[0024] During production, crude barium is fed into the crude barium feed silo 2 using a loader or elevator. A feeding auger 1 is connected to the bottom of the silo, and the auger's output end is connected to the inlet 3 of the ball mill 4. An electronic weighing device is installed in the crude barium feed silo 2, and the feeding weight is set via computer, automatically controlling the rotation speed of the feeding auger 1. The purpose of ball milling is to crush the granular and large agglomerated crude barium formed in the crude barium roasting furnace into suitable particle sizes, facilitating leaching, brine extraction, slag washing, and slag removal. The fineness of the ball mill can be controlled by adjusting the rotation speed and the amount of grinding balls added. The amount of grinding balls of different sizes (diameters) added should be in a specified ratio; this control also allows for fineness control. In this new type, the ball mill 4 uses wet grinding. A dilute brine (i.e., dilute barium sulfide solution, hereinafter the same) inlet is installed at the inlet 3 of the ball mill 4, and the dilute brine flow rate is adjusted proportionally according to the set feed rate of the auger leaching system. The feed flow rate of this diluted brine should not be too high, otherwise it will affect the washing effect of the slag in the subsequent screw conveyor. The particle size of the ball mill pulverizer 4 is 6-10 mesh, with a residue of 1-5%. If the pulverization is too fine, it will increase the load on the concentrated brine clarification equipment and the mud washing equipment, making production operation difficult; conversely, if the pulverization is too coarse, it will cause insufficient dissolution of barium sulfide.

[0025] The auger leaching system consists of multiple interconnected leaching augers. Figure 1 The auger leaching system consists of six augers: A, B, C, D, E, and F. However, those skilled in the art should understand that the number of augers can be adjusted adaptively according to actual process requirements, for example, fewer than six or more than six. The minimum number of augers can be three, and the maximum number can be ten. The residence time of crude barium in the augers is about 5 hours. In actual production, it has been found that a larger number of augers has no significant impact on improving the leaching rate of barium sulfide.

[0026] In this new type of auger, the feed inlet of auger A is connected to the feed chute 6. Coarse barium powder enters auger A through chute 6. The discharge outlet of auger A is connected to the feed inlet of auger B, the discharge outlet of auger B is connected to the feed inlet of auger C, and so on, with augers A, B, C, D, E, and F connected sequentially. An outlet is provided at one end of auger A, and an inlet is provided on auger E (the penultimate auger). Production return water is injected through the inlet of auger E. A slag-lifting auger (the last auger) is installed on auger F, with a tap water spray pipe 6-1 installed on it. The residue exiting auger F is conveyed out by a slag conveyor 6-2.

[0027] In this new type, the feed chute 6 is connected to the feed inlet of the first auger (A auger). A solid-liquid mixture containing a small amount of solid sludge enters the A auger from the feed inlet. The liquid level of the brine inside the auger shell is 200mm-300mm above the auger spiral blades. A level gauge is installed inside the shell to control the liquid level. An overflow baffle is installed on one side of the auger shell to reduce the solid content in the overflowing brine and prevent the sludge inside the auger shell from flowing directly into the side where the discharge pump pipe is located, causing blockage of the discharge pump. A discharge pump is installed on one side of the A auger shell, which transfers the semi-finished brine in the A auger into the continuous clarification tank 13.

[0028] See also Figure 2 and Figure 3 For the leaching auger, a rotating auger shaft 14-1 is set at the center of the auger, and multiple spiral blades 14 are fixed on the auger shaft 14-1. The multiple spiral blades 14 are spirally distributed along the auger shaft 14-1. When the auger shaft 14-1 rotates, the multiple spiral blades 14 push the crude barium solid-liquid mixture in the auger forward. As the crude barium moves forward, it forms convection with the dilute brine entering from the E auger (the penultimate auger), and the barium sulfide in the crude barium is gradually dissolved.

[0029] The leaching auger is equipped with a heating jacket, through which steam is circulated for heating and maintaining the temperature of the barium brine solution inside the auger. The temperature of the barium sulfide brine solution inside the auger shell is controlled at 70-80℃. The steam valve is automatically opened and closed based on temperature changes. Power is transmitted to each leaching auger via a motor, gearbox, chain, and sprocket mounted at one end of the auger. The auger can be supported either inside or outside the auger shell.

[0030] In this new type of leaching auger, the first and second leaching augers can be installed horizontally, while the third, fourth, and fifth leaching augers are installed at an inclination of 1-4 degrees. The sixth auger is a slag-lifting auger equipped with spray pipes and uses tap water to wash the slag, ensuring that the barium sulfide content in the barium slag is ≤0.5%. Production return water is added from the fifth auger.

[0031] See again Figure 1 In the clarification and washing system, the crude barium sulfide solution undergoes a second leaching process after multiple consecutive clarification and washing stages. The clarification and washing system contains multiple clarification and washing units, each comprising interconnected continuous clarification tanks and mud mixing washing tanks, both equipped with stirring mechanisms. For example... Figure 1As shown, the No. 1 clarification and washing unit includes a No. 1 continuous clarification tank 13 and a No. 1 mud mixing and washing tank 9-1, with the bottom mud outlet of the No. 1 continuous clarification tank 13 and the feed inlet of the No. 1 mud mixing and washing tank 9-1 connected by a pipeline; correspondingly, the No. 2 clarification and washing unit includes a No. 2 continuous clarification tank 12 and a No. 2 mud mixing and washing tank 9-2, with the bottom mud outlet of the No. 1 continuous clarification tank 12 and the feed inlet of the No. 2 mud mixing and washing tank 9-2 connected by a pipeline; the No. 3 clarification and washing unit includes a No. 3 continuous clarification tank 11 and a No. 3 mud mixing and washing tank 9-3, with the bottom mud outlet of the No. 3 continuous clarification tank 11 and the feed inlet of the No. 3 mud mixing and washing tank 9-3 connected by a pipeline; the No. 4 clarification and washing unit includes a No. 4 continuous clarification tank 10 and a No. 4 mud mixing and washing tank 9-4, with the bottom mud outlet of the No. 4 continuous clarification tank 10 and the feed inlet of the No. 4 mud mixing and washing tank 9-4 connected by a pipeline.

[0032] The concentrated brine flowing from one side of the first leaching auger (A auger) is pumped out using a concentrated brine pump. This concentrated brine still contains suspended sludge particles and must undergo clarification. The concentrated brine is then pumped into the clarification and washing system. It first enters continuous clarification tank 13 (No. 1), where the agitator is activated. After settling, the solid and liquid components separate within tank 13. The clear, concentrated barium brine flows out from the overflow port at the top of tank 13 and enters the barium sulfide finished product tank for use in the next process. The sludge is discharged from the sludge outlet at the bottom of continuous clarification tank 13 and flows into the lower sludge mixing and washing tank 9-1.

[0033] During the mud washing process, a certain proportion of washing water is added to the No. 1 mud mixing and washing tank 9-1. The washing water in the No. 1 mud mixing and washing tank 9-1 is the clarified dilute brine from the No. 3 continuous clarification tank 11, which is separated from it. Then, the stirring mechanism in the No. 1 mud mixing and washing tank 9-1 is started to mix the mud with the dilute brine. Then, the mixed mud is transferred to the No. 2 continuous clarification tank 12. The clear dilute barium sulfide solution coming out of the No. 2 continuous clarification tank 12 is directly pumped into the ball mill 4 for use. The concentrated mud flowing out from the bottom directly enters the No. 2 mud mixing and washing tank 9-2.

[0034] Similar to mud mixing and washing tank 9-1, a certain proportion of washing water is added to mud mixing and washing tank 9-2. The washing water in mud mixing and washing tank 9-2 is the clarified dilute brine from the subsequent continuous clarification tank 10 4, which is separated from it. Then, the stirring mechanism in mud mixing and washing tank 9-2 is started to mix the mud with the dilute brine. Then, the mixed mud is transferred to continuous clarification tank 11 3.

[0035] The clear solution overflowing from the No. 3 continuous clarification tank 11 flows into the No. 1 mud mixing and washing tank 9-1. The concentrated mud flowing out of the No. 3 continuous clarification tank 11 enters the No. 3 mud mixing and washing tank 9-3. A certain proportion of washing water is added to the No. 3 mud mixing and washing tank 9-3. The washing water in the No. 3 mud mixing and washing tank 9-3 is dilute brine obtained from the subsequent slag discharge system. Then, the stirring mechanism in the No. 3 mud mixing and washing tank 9-3 is started to mix the mud with the dilute brine. Then, the mixed mud is transferred to the No. 4 continuous clarification tank 10.

[0036] The clear solution overflowing from the No. 4 continuous clarification tank 10 flows into the No. 2 mud mixing and washing tank 9-2. The concentrated mud flowing out of the No. 4 continuous clarification tank 10 enters the No. 4 mud mixing and washing tank 9-4. A certain proportion of clean water is added to the No. 4 mud mixing and washing tank 9-4 for washing. Then, the stirring mechanism in the No. 4 mud mixing and washing tank 9-4 is started to mix the mud with the clean water. Then, the mixed mud is pumped into the slag discharge system. After being filtered by the slag discharge system, the mud residue is sent to the slag treatment process.

[0037] The slag discharge system is used for the final filtration of the washed mud. The slag discharge system can be a plate and frame filter press or a belt filter. The filtrate after filtration by the plate and frame filter press or belt filter is sent to the No. 3 mud mixing and washing tank 9-3.

[0038] This novel clarification and washing system consists of multiple clarification and washing units. The first clarification and washing unit is used to extract concentrated brine (from continuous clarification tank 13), and the second clarification and washing unit is used to supply grinding water to the feeding system (from continuous clarification tank 12). Each clarification and washing unit contains a mud mixing and washing tank for washing the mud to extract barium sulfide from the mud. During the mud washing process, the previous clarification and washing unit uses diluted brine from the next clarification and washing unit, which is spaced apart from it, to complete the washing process. This can maximize the extraction rate of barium sulfide from the mud.

[0039] This new invention solves the problems of discontinuous leaching, unstable barium sulfide quality, and poor operating conditions. It achieves continuous leaching production, sealed leaching equipment, stable leaching parameters, and a more environmentally friendly leaching process. Furthermore, this new invention incorporates a clarification and washing system to continuously wash the slurry during the production process, thereby completely extracting barium sulfide from the slurry, improving the extraction rate of barium sulfide from waste slurry, and avoiding waste.

[0040] Example 2

[0041] This embodiment focuses on its differences from Embodiment 1, while the similarities will not be repeated. This embodiment improves upon the immersion auger in Embodiment 1.

[0042] like Figure 4 As shown, in this embodiment, a main partition 16 is further provided between the multiple spiral blades 14 of the leaching auger. The main partition 16 is vertically fixed on the auger shaft 14-1. Multiple main partitions 16, such as four, can be provided inside the leaching auger. The main partitions 16 can divide the leaching auger into multiple segments. Through holes 16-1 can be provided on the main partitions 16, so that the brine in each segment can flow through from the position close to the spiral blades 14. Under the action of the main partitions 16, the brine can repeatedly collide and mix with the crude barium in the auger, so that the brine can have more sufficient contact with the crude barium, increase the leaching concentration of barium sulfide, and improve the washing effect. The main partition 16 can be provided in only one of the leaching augers, or it can be provided in all the leaching augers. For example, the second, third, fourth, and fifth augers can each have a main partition 16 installed between the spiral blades 14 of the auger, so that the sludge can be fully mixed with the dilute brine.

[0043] Furthermore, a secondary partition 15 can be provided on the screw conveyor 14. The diameter of the secondary partition 15 is smaller than that of the main partition 16. The secondary partition 15 does not have through holes. The secondary partition 15 mainly plays a delaying role for the crude barium mixture, which can prolong the residence time of the crude barium mixture in the leaching screw conveyor, so that the barium sulfide in the crude barium has sufficient time to dissolve, thereby improving the extraction rate of barium sulfide.

[0044] In this embodiment, the auger leaching system uses multiple leaching augers for continuous leaching. At the same time, main and auxiliary baffles are added to the leaching augers. Under the action of the baffles, the leaching augers are divided into multiple sections, so that the crude barium and the leaching brine can be fully mixed, thereby improving the leaching rate.

[0045] Example 3

[0046] See again Figure 3 In this novel design, we define the vertical distance D between the apex of the auger blade and the next apex as the blade diameter (or "auger diameter"). In Example 1, the blade diameters in each auger are equal, which is feasible for subsequent augers such as auger B and auger C. However, for the feed auger (i.e., auger A), the following problem exists: Since the feed inlet of auger A contains freshly ground but unleached crude barium, and the feed inlet and brine outlet are located at the same end of the auger, some of the unleached crude barium is washed away by the brine from the brine outlet, reducing the leaching rate of barium sulfide.

[0047] To address the aforementioned issues, this embodiment modifies the blade diameter, causing the diameter of the feed auger to gradually increase from the feed end to the discharge end. See also... Figure 5A and Figure 5B Feed auger 18 ( Figure 1The feed auger 18 (A type) has a shell 18-1, on which a crude barium inlet and a brine outlet are provided. The crude barium inlet and brine outlet are located at one end of the shell 18-1 (feed end); the other end of the shell 18-1 (discharge end) has a crude barium outlet and a brine inlet. The blade diameter of the feed auger 18 gradually increases from the feed end to the discharge end. This structure allows for a smaller feed end space, where the crude barium is subjected to greater compression, making it easier for the crude barium to adhere more tightly. The adhered crude barium is not easily washed away by the brine. As the rear end space of the feed auger 18 gradually increases, the crude barium can more easily move into the rear end space and disperse in the larger rear end space, which is beneficial for the leaching of barium sulfide.

[0048] Example 4

[0049] This embodiment focuses on improving the clarification and washing system in Embodiment 1. In Embodiment 1, the clarification and washing system contains multiple clarification and washing units. Each clarification and washing unit includes an interconnected continuous clarification tank and a mud mixing and washing tank. Both the continuous clarification tank and the mud mixing and washing tank are equipped with a stirring mechanism. This arrangement of the clarification tank and the mud mixing and washing tank is decentralized, which occupies a large area and requires the construction of a large plant. The mud enters the mud mixing and washing tank from the clarification tank by gravity, which takes a long time and results in a slow production speed. Furthermore, the mud mixing and washing tank requires an additional stirring mechanism, increasing energy consumption.

[0050] like Figure 6A , Figure 6B , Figure 6C As shown, this embodiment provides an integrated clarification and washing unit, which includes a clarification tank 19, a feeding auger 25, a tee 24, a first sludge pump 20, a connector 21, a second sludge pump 22, a connecting pipe 23, and a drive shaft 26. The drive shaft 26 is a through shaft that passes sequentially through the feeding auger 25, the tee 24, the first sludge pump 20, the connector 21, and the second sludge pump 22. The clarification tank 19 is located above the feeding auger 25, and the clarification tank 19 and the feeding auger 25 can be integrally set. A valve hole 19-1 is provided at the bottom of the clarification tank 19. The valve hole 19-1 can be controlled to open or close. When the valve hole 19-1 is opened, the sludge at the bottom of the clarification tank 19 enters the feeding auger 25.

[0051] The first end of the tee 24 is connected to the feeding auger 25, the second end is connected to the inlet of the first sludge pump 20, and the third end 24-1 of the tee is the dilute brine inlet. The outlet of the first sludge pump 20 is connected to the inlet of the second sludge pump 22 through the connecting pipe 23, and the outlet of the second sludge pump 22 is connected to the next clarification and washing unit. The first sludge pump 20 and the second sludge pump 22 are fixed together by a connector 21.

[0052] The drive shaft 26 can be divided into three sections, such asFigure 6C As shown, it consists of a first section 26-1, a middle section 26-2, and a tail section 26-3, which are connected in sequence. The first section 26-1 passes through the housing of the feeding auger 25 and is connected to the motor. The middle section 26-2 is mainly located in the feeding auger 25. The middle section 26-2 is equipped with spiral blades 26-4. The tail section 26-3 passes through the tee 24 and is connected to the first sludge pump 20 and the second sludge pump 22, serving as the power input shaft for the first sludge pump 20 and the second sludge pump 22.

[0053] After clarification is completed, the clarification tank 19 opens the valve port 19-1, starts the motor, and the drive shaft 26 rotates under the drive of the motor. The spiral blades 26-4 rotate to start conveying slurry. At the same time, the tail section 26-3 of the drive shaft 26 drives the first sludge pump 20 and the second sludge pump 22 to work. The first sludge pump 20 and the second sludge pump 22 form a vacuum suction for the clarification and washing unit. Under the action of this suction force, the sludge and dilute brine are sucked into the first sludge pump 20 through the three-way valve 24. The first mixing is completed in the rotating chamber 20-1 of the first sludge pump 20. Since the path of the rotating chamber 20-1 is relatively short, in order to ensure that the sludge and dilute brine can be fully mixed, the first sludge pump 20 pumps the mixed sludge into the second sludge pump 22 through the connecting pipe 23. The second mixing is completed in the rotating chamber 22-1 of the second sludge pump 22, thereby achieving full mixing of sludge and dilute brine.

[0054] The clarification and washing unit in this embodiment has a compact structure. The mud conveying and mixing adopts the vacuum suction mixing principle, which can complete the mud conveying and mixing in a short time, improving production efficiency. Moreover, the conveying and mixing can be completed by a single motor, reducing energy consumption.

[0055] While the technology has been described and illustrated with respect to one or more embodiments, changes and / or modifications may be made to the illustrated examples without departing from the spirit and scope of the appended claims. In particular, with respect to the various functions performed by the aforementioned components or structures (components, devices, circuits, systems, etc.), the terminology used to describe such components (including references to “apparatus”) is intended to correspond to any component or structure performing the specified function of the described component (e.g., functionally equivalent), even if structurally not equivalent to the disclosed structure performing the function of the illustrated embodiments described herein, unless otherwise specified. Furthermore, while a particular feature may have been disclosed with respect to one of several embodiments, such feature may be combined with one or more other features in other embodiments as may be desired and advantageous for any given or particular application. Moreover, with regard to the use of the terms “comprising,” “including,” “having,” “containing,” “comprising,” or variations thereof in the detailed description or claims, such terms are intended to be inclusive in a manner similar to the term “comprising.”

[0056] Many specific details have been set forth in the foregoing description to provide a full understanding of the present invention. However, the above description is merely a preferred embodiment of the present invention, and the present invention can be implemented in many other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed above. Furthermore, any person skilled in the art can make many possible variations and modifications to the present invention, or modify it into equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the present invention. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A continuous leaching apparatus for crude barium sulfide, characterized in that, It includes a feeding system, a screw conveyor leaching system, a clarification and washing system, and a slag discharge system; the feeding system, screw conveyor leaching system, clarification and washing system, and slag discharge system are connected in sequence. The feeding system is used to transport crude barium to the screw conveyor leaching system. In the screw conveyor leaching system, the crude barium is mixed with the production return water injected into the screw conveyor leaching system to complete the first leaching and obtain a crude barium sulfide solution. The crude barium sulfide solution then enters the clarification and washing system. After multiple clarification and washing processes in the clarification and washing system, the crude barium sulfide solution undergoes a second leaching to obtain finished brine and sludge. The finished brine is sent into a finished product tank, and the sludge is discharged through the sludge discharge system.

2. The continuous leaching apparatus for crude barium sulfide according to claim 1, characterized in that, The feeding system includes a coarse barium feeding auger and a ball mill. The coarse barium feeding auger is connected to the inlet of the ball mill. A coarse barium feeding hopper is provided on the coarse barium feeding auger. The outlet of the ball mill is connected to the auger leaching system through a feed chute. A dilute brine inlet is installed at the inlet of the ball mill. The dilute brine comes from the clarification and washing system.

3. The continuous leaching apparatus for crude barium sulfide according to claim 2, characterized in that, The ball mill pulverizer has a pulverizing particle size of 6-10 mesh, with a residue of 1-5%.

4. The continuous leaching apparatus for crude barium sulfide according to claim 3, characterized in that, The auger leaching system consists of multiple interconnected leaching augers. The feed inlet of the first leaching auger is connected to the feed chute. The penultimate leaching auger is equipped with a liquid inlet. The production return water is injected through the liquid inlet of the penultimate leaching auger. The last leaching auger is a slag removal auger, on which a tap water spray pipe is installed.

5. The continuous leaching apparatus for crude barium sulfide according to claim 1, characterized in that, The clarification and washing system contains multiple interconnected clarification and washing units. Each clarification and washing unit includes an interconnected continuous clarification tank and a mud mixing and washing tank. Both the continuous clarification tank and the mud mixing and washing tank are equipped with a stirring mechanism.

6. The continuous leaching apparatus for crude barium sulfide according to claim 5, characterized in that, The first set of clarification and washing units is used to extract concentrated brine from the No. 1 continuous clarification tank, and the second set of clarification and washing units is used to supply grinding water to the feeding system from the No. 2 continuous clarification tank.

7. The continuous leaching apparatus for crude barium sulfide according to claim 1, characterized in that, The auger leaching system includes a feed auger, the diameter of which gradually increases from the feed end to the discharge end.

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