Water treatment equipment based on thallium removal agent of modified biochar and preparation method of thallium removal agent

Abstract

The application provides a water treatment equipment based on a modified biochar thallium removal agent and a preparation method of the thallium removal agent. The application relates to the technical field of water pollution treatment, and the water treatment equipment based on the modified biochar thallium removal agent comprises a treatment box, a driving mechanism and a discharging mechanism. An inlet pipe is arranged on the side wall of the treatment box. A top plate is arranged on the upper surface of the treatment box through bolts. The driving mechanism comprises a moving plate. The dosing mode of the application has integrated operation of mixing, grinding and discharging. The molten salt modified biochar thallium removal agent and lime or sodium hydroxide are more beneficial to contact and dissolve with lithium mica brine in the treatment box, so that the water body can be fully adsorbed, the utilization rate of the molten salt modified biochar thallium removal agent is maximized, efficient thallium removal is ensured, the pH value of the whole water body can be further adjusted, thallium elements in the lithium mica brine are effectively removed, water pollution is avoided, and the development of environmental protection is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water pollution treatment, in particular to a water treatment equipment based on a modified biochar thallium removal agent and a preparation method of the thallium removal agent. BACKGROUND

[0002] In recent years, with the explosive growth of the new energy industry, lithium ion batteries, as the main power source of new energy vehicles, cannot be prepared without the core component of the positive material. The preparation of the core component of the positive material cannot be separated from the battery-grade lithium carbonate. However, thallium elements are associated with lithium mica minerals. In the lithium mica ore sulfate roasting-water leaching process for extracting lithium, thallium elements will be dissolved in the leaching solution together with lithium. Thallium (Tl) is a highly toxic heavy metal element. In order to meet environmental protection requirements, thallium removal has become an inevitable process in the lithium carbonate industry.

[0003] At present, the removal technology of Tl+ in water mainly includes sulfidation precipitation method, oxidation method, ion exchange method and adsorption method. Among them, the adsorption method is favored because of its simple operation and controllable cost, but the traditional adsorption materials (such as activated carbon, clay minerals) generally have low adsorption capacity, poor selectivity and weak regeneration performance. Biochar, as a kind of green and low-cost carbon material, has been tried to be used for heavy metal adsorption, but its original surface function group is single (mainly hydroxyl and carboxyl), and the pore structure is disordered, which makes it difficult to meet the actual demand for adsorption capacity and selectivity of Tl+. In recent years, molten salt can be used as a reaction medium and a template at high temperature, and can be used to cooperatively control the material structure through etching, oxidation and ion exchange, so it has attracted much attention.

[0004] However, in the prior art, the modified biochar thallium removal agent is not uniformly mixed with lithium mica brine during adsorption treatment, and it is not convenient for users to uniformly and stably add the modified biochar thallium removal agent to the water environment during the dosing process, which may cause poor treatment effect of lithium mica brine and poor treatment of internal thallium elements. In addition, it is not convenient to adjust the pH value.

[0005] Therefore, it is necessary to provide a water treatment equipment based on a modified biochar thallium removal agent and a preparation method of the thallium removal agent to solve the above technical problems. SUMMARY

[0006] The present application provides a water treatment equipment based on a modified biochar thallium removal agent and a preparation method of the thallium removal agent, which solves the technical problem of uneven mixing of the modified biochar thallium removal agent with lithium mica brine during adsorption treatment in the related art, resulting in poor treatment effect.

[0007] To solve the above technical problems, the water treatment equipment based on a modified biochar thallium removal agent provided by the present application comprises a treatment box, a driving mechanism and a discharging mechanism.

[0008] An inlet pipe is installed on the side wall of the treatment box.

[0009] The upper surface of the processing box is provided with a top plate through bolt mounting, the driving mechanism comprises a moving plate, the upper surface of the moving plate is provided with a driving motor through bolt mounting, the upper surface of the moving plate and located on one side of the driving motor is fixedly provided with a positioning cover, the outer wall of the positioning cover is provided with a first mounting plate, a blanking bin and a second mounting plate through bolt mounting, the output shaft key groove of the driving motor close to one side of the positioning cover is connected with a driving rod, the outer wall key groove of the driving rod is connected with a first gear, the inside of the first mounting plate and above the driving rod is rotatably connected with a driven rod, the outer wall key groove of the driven rod is connected with a second gear, the top of the blanking bin is fixedly provided with a top pipe, the bottom of the blanking bin is fixedly provided with a discharge pipe, the inside of the blanking bin and the outer wall of the driving rod and the driven rod are respectively connected with a first rotating plate and a second rotating plate through key groove, the inside of the two sides of the first rotating plate and the second rotating plate is provided with a grinding sleeve through bolt mounting, the top end flange of the top pipe is provided with a first feeding pipe and a second feeding pipe.

[0010] Preferably, the shaft center of the first gear and the second gear is rotatably connected with the first mounting plate through a bearing, and the two ends of the driving rod and the driven rod are rotatably connected with the second mounting plate and the positioning cover through bearings.

[0011] Preferably, the length of the first rotating plate is longer than the length of the second rotating plate, and a gap is left between the limit position of the two sides of the second rotating plate and the inner wall of the blanking bin, and the first gear and the second gear are engaged with each other.

[0012] Preferably, the upper surface of the top plate is provided with a rack and a limiting plate respectively, one end of the output shaft of the driving motor and away from one side of the positioning cover is connected with a guide wheel through key groove, the upper surface of the moving plate and located on one side of the positioning cover is fixedly provided with a side plate, and the bottom of the moving plate is rotatably connected with a plurality of rollers.

[0013] Preferably, the shaft center of the guide wheel is rotatably connected with the side plate through a bearing, the outer wall of the guide wheel is closely attached to the inner wall of the limiting plate, and the plurality of rollers are in contact with the upper surface of the top plate.

[0014] Preferably, it further comprises a spreading mechanism, the spreading mechanism comprises a mounting frame mounted on the outer wall of the second mounting plate, the inside of the mounting frame and the outer end of the driving rod are connected with a driving gear through key groove, one side of the driving gear is engaged with a driven gear, the shaft center of the driven gear is connected with a rotating rod through key groove, the bottom end of the rotating rod is fixedly provided with a spreading disc, and the outer wall of the discharge pipe is fixedly provided with a baffle.

[0015] Preferably, the outer wall of the rotating rod is rotatably connected with the mounting frame through a bearing, and the two sides of the baffle are set at forty-five degrees with respect to the vertical direction of the shaft center of the discharge pipe.

[0016] Preferably, the reciprocating mechanism further comprises a filter plate fixed to the inner wall of the treatment box in the same horizontal direction as the exhaust pipe, and positioning plates are fixed to both sides of the filter plate, and a lever frame is slidably connected to the opposite side of the positioning plate, and two slide rods are fixed to the inner wall of the treatment box directly above the filter plate, and a reciprocating plate is slidably connected to the outer wall of the two slide rods, and two reset springs are sleeved to the outer wall of the two slide rods on one side of the reciprocating plate, and a connecting plate is rotatably connected to the bottom of the reciprocating plate.

[0017] The two reset springs are fixedly connected to the inner wall of the treatment box and the reciprocating plate, the bottom end of the connecting plate is rotatably connected to the outer wall of the lever frame, the side wall of the moving plate is fixedly provided with a resisting plate, and the inner part of the top plate is provided with a sliding groove.

[0018] A preparation method of a thallium removal agent, comprising the following preparation steps:

[0019] S1: ball milling biomass and potassium salt at a mass ratio of 1:(0.5-3), or ball milling biomass, potassium salt and pure water at a mass ratio of 1:(0.5-3):10 at 80 DEG C for 6-12 hours to obtain a mixture, and pyrolyzing the mixture under a protective atmosphere to obtain a molten salt modified biochar thallium removal agent, wherein the biomass is corn starch,

[0020] S2: based on S1, one of the potassium salt is potassium chloride, and the other is any one of potassium carbonate or potassium bicarbonate, the mass ratio of the two potassium salts is 1:1, the ball milling time is 0.2-1h, and the pyrolysis mode is gradient heating, the first stage pyrolysis temperature is 300-350 DEG C, the pyrolysis time is 1-2h, the second stage pyrolysis temperature is 550-850 DEG C, and the pyrolysis time is 1-2h;

[0021] S3: based on S2, after pyrolysis, further comprising: removing excess potassium salt or surface dissolved substances by dilute hydrochloric acid and deionized water.

[0022] Compared with the related art, the water treatment equipment based on the modified biochar thallium removal agent has the following beneficial effects:

[0023] Compared with the traditional direct dosing design, the present application first designs two independent pipes for partitioned dosing of the molten salt modified biochar thallium removal agent and lime or sodium hydroxide in the interior of the discharge bin, although the interior of the discharge bin is provided with two first rotating plates and second rotating plates of the same structure, the length of the first rotating plate is longer than that of the second rotating plate, forming a gap between the second rotating plate and the inner wall of the discharge bin, so that the first step can grind the solid material into an equal volume of solid material for large blocks and caked solid materials formed during conveying;

[0024] Secondly, the first rotating plate is entered to form two-stage grinding to fine powder state and is put into the treatment box. Such design makes the dosing mode have integrated operation of mixing, grinding and discharging. The thallium removal agent of modified biochar of molten salt and lime or sodium hydroxide are more beneficial to contact and dissolve with the lithium mica brine in the treatment box, so that the water body can fully realize adsorption, the utilization rate of the thallium removal agent of modified biochar of molten salt is maximized, efficient thallium removal is ensured, and the pH value of the whole water body can be adjusted, the thallium element in the lithium mica brine is effectively removed, water pollution is avoided, and the development of environmental protection is beneficial. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained according to the structures shown in the drawings without creative labor for those skilled in the art.

[0026] Figure 1 The best structure schematic diagram provided by the present application is shown in the figure.

[0027] Figure 2 The side view structure schematic diagram is shown in the figure. Figure 1 The enlarged structure schematic diagram of A shown in the figure.

[0028] Figure 3 The side view structure schematic diagram is shown in the figure. Figure 1 The treatment box cross-section structure schematic diagram is shown in the figure.

[0029] Figure 4 The driving mechanism and the discharging mechanism are shown in the figure. Figure 1 The driving mechanism and the discharging mechanism are shown in the figure.

[0030] Figure 5 The driving mechanism and the discharging mechanism are shown in the figure. Figure 2 The driving mechanism and the discharging mechanism are shown in the figure.

[0031] Figure 6 The driving mechanism and the discharging mechanism are shown in the figure. Figure 5 The driving mechanism and the discharging mechanism are shown in the figure.

[0032] Figure 7 The driving mechanism and the discharging mechanism are shown in the figure.

[0033] Figure 8 The driving mechanism and the discharging mechanism are shown in the figure. Figure 7 The driving mechanism and the discharging mechanism are shown in the figure.

[0034] Figure 9 The driving mechanism and the discharging mechanism are shown in the figure. Figure 5 The driving mechanism and the discharging mechanism are shown in the figure.

[0035] Figure 10 for Figure 9 The diagram shows the working state of the rotary grinding mechanism for the feeding mechanism.

[0036] Figure 11 This is a schematic diagram of the material spreading mechanism provided by the present invention;

[0037] Figure 12 This is a schematic diagram of the reciprocating mechanism structure provided by the present invention;

[0038] Figure 13 for Figure 12 The enlarged structural diagram at point B is shown below;

[0039] Figure 14 A comparison of the thallium removal rates of thallium-removing agents prepared at different pyrolysis temperatures in lepidolite brine.

[0040] Figure 15 A comparison chart showing the removal rate of thallium in lepidolite brine by different dosages of thallium removal agent;

[0041] Figure 16 A comparison of the thallium removal rates of thallium in lepidolite brine prepared with different mass ratios.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Processing box;

[0044] 2. Top plate; 3. Rack; 4. Limiting plate; 5. Slide groove;

[0045] 6. Drive mechanism; 61. Moving plate; 62. Side plate; 63. Positioning cover; 64. Drive motor; 65. Guide wheel; 66. Contact plate; 67. Roller.

[0046] 7. Feeding mechanism; 71. First mounting plate; 72. Feeding bin; 73. Second mounting plate; 74. Drive rod; 75. First gear; 76. Second gear; 77. Top tube; 78. First feed pipe; 79. Second feed pipe; 710. Discharge pipe; 711. Baffle; 712. First rotating plate; 713. Second rotating plate; 714. Grinding sleeve; 715. Driven rod;

[0047] 8. Spreading mechanism; 81. Mounting frame; 82. Drive gear; 83. Driven gear; 84. Rotating rod; 85. Spreading disc;

[0048] 9. Reciprocating mechanism; 91. Slide rod; 92. Reciprocating plate; 93. Return spring; 94. Connecting plate; 95. Filter plate; 96. Positioning plate; 97. Lever bracket.

[0049] 10. Discharge pipe;

[0050] 11. Enter the tube. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort fall within the protection scope of the present application.

[0052] The present application provides a water treatment device based on a modified biochar thallium removal agent and a preparation method of the thallium removal agent.

[0053] First embodiment:

[0054] The preparation method of the thallium removal agent comprises the following steps:

[0055] S1: ball milling biomass and potassium salt at a mass ratio of 1:(0.5-3), or stirring biomass, potassium salt and pure water at a mass ratio of 1:(0.5-3):10 at 80℃ for 6-12h to obtain a mixture, and pyrolyzing the mixture under a protective atmosphere to obtain a molten salt modified biochar thallium removal agent, wherein the biomass is corn starch,

[0056] S2: based on S1, one of the potassium salt is potassium chloride, and the other is any one of potassium carbonate or potassium bicarbonate, the mass ratio of the two potassium salts is 1:1, the ball milling time is 0.2-1h, and the pyrolysis mode is gradient heating, the first stage pyrolysis temperature is 300-350℃, the pyrolysis time is 1-2h, the second stage pyrolysis temperature is 550-850℃, and the pyrolysis time is 1-2h;

[0057] S3: based on S2, after pyrolysis, further comprising: removing excess potassium salt or surface dissolved substances by dilute hydrochloric acid and deionized water.

[0058] Based on the above preparation method, the modified biochar thallium removal agent also has the following detailed preparation methods:

[0059] The first method is (1) ball milling corn starch and potassium salt at a mass ratio of 1:1.5 for 0.5h, wherein the potassium salt is potassium chloride and potassium carbonate, and the mass ratio is 1:1;

[0060] (2) pyrolyzing the mixture under a protective atmosphere by gradient heating, the first stage pyrolysis temperature is 350℃, the pyrolysis time is 2h, the second stage pyrolysis temperature is 650℃, and the pyrolysis time is 1h, to obtain a molten salt modified biochar thallium removal agent.

[0061] The prepared thallium removal agent is used to treat lithium mica brine, wherein the reaction conditions are: the dosage is 0.6 g / L, and the adsorption time is 4 h. The thallium removal rate of the molten salt modified biochar thallium removal agent prepared by the method to thallium in lithium mica brine is 99.32%.

[0062] Secondly, (1) corn starch, potassium salt and pure water are stirred at 80 DEG C for 6 hours according to the mass ratio of 1:1:10, to obtain a mixture;

[0063] (2) the mixture is pyrolyzed under a protective atmosphere by gradient temperature rising, the first stage pyrolysis temperature is 350 DEG C, the pyrolysis time is 2 hours, the second stage pyrolysis temperature is 650 DEG C, and the pyrolysis time is 1 hour, to obtain a molten salt modified biochar thallium removal agent.

[0064] The prepared thallium removal agent is used to treat lithium mica brine, wherein the reaction conditions are: the dosage is 0.6 g / L, and the adsorption time is 4 h. The thallium removal rate of the molten salt modified biochar thallium removal agent prepared by the method to thallium in lithium mica brine is 99.32%.

[0065] Thirdly, the method explores the influence of pyrolysis temperature on the performance of the molten salt modified biochar thallium removal agent. The preparation method is consistent with the first method. Only the second stage pyrolysis temperature is changed to 450 DEG C, 550 DEG C, 650 DEG C and 750 DEG C to prepare the corresponding adsorbents. The prepared thallium removal agent is used to treat lithium mica brine, wherein the reaction conditions are: the dosage is 0.6 g / L, and the adsorption time is 4 h.

[0066] Figure 14 The results show that when the pyrolysis temperature of the molten salt modified biochar thallium removal agent is too low, the thallium removal performance decreases due to insufficient surface oxidation and potassium ion doping. When the pyrolysis temperature is too high, the thallium removal performance decreases due to excessive graphitization leading to pore collapse.

[0067] Fourthly, the method explores the influence of dosage on the performance of the molten salt modified biochar thallium removal agent. The preparation method is consistent with the first method. Only the dosage of the thallium removal agent is changed. The prepared thallium removal agent is used to treat lithium mica brine, wherein the reaction conditions are: the dosage is 0.2 g / L, 0.4 g / L, 0.6 g / L, 0.8 g / L and 1 g / L, and the adsorption time is 4 h.

[0068] Figure 15 The test results show that as the dosage of the molten salt modified biochar thallium removal agent increases, the thallium removal rate increases. When the dosage reaches 0.2 g / L, the thallium removal performance is good.

[0069] The fifth method: the method explores the influence of the mass ratio of corn starch and potassium salt on the performance of the thallium removal agent of the molten salt modified biochar. The preparation method of the method is consistent with the first method. Only the mass ratio of corn starch and potassium salt is changed to 1:1, 1:1.5 and 1:2. The prepared thallium removal agent is used to treat lithium mica brine, wherein the reaction conditions are: the dosage is 0.6 g / L, and the adsorption time is 4 h.

[0070] Figure 16 The results show that when the mass ratio of corn starch and potassium salt of the thallium removal agent of the molten salt modified biochar is low, the doping amount of potassium ions is low, and the thallium removal performance is also reduced. When the mass ratio of corn starch and potassium salt is high, the pores are blocked by the excess molten potassium salt, and the carbon skeleton structure is damaged due to excessive etching at high temperature, which finally leads to the decrease of the thallium removal performance.

[0071] It can be known from the above that: by using the mixed molten salt system to modify the biochar, the high-temperature etching, surface oxidation and potassium ion doping triple effects of the molten salt are utilized to construct the functionalized biochar with high specific surface area, rich oxygen-containing functional groups and stable ion exchange sites. The material retains the low-cost and renewable advantages of biochar, and can break through the bottleneck of the adsorption capacity and selectivity of traditional adsorbents to Tl+, and provides an innovative solution for the efficient treatment of high-toxicity thallium contaminated water.

[0072] The embodiment has the following beneficial effects:

[0073] The conventional KOH activation method has strong corrosion and high energy consumption, and the direct pyrolysis modification of biochar by K2CO3 will lead to single pore structure and uneven loading of potassium elements. The biochar is modified by the mixed molten salt system in the present application, the pore structure is moderately controlled by the liquid phase reaction of the molten salt method to avoid excessive etching, and the uniform doping of potassium elements and the hierarchical control of pores are realized by the fluidity of the molten salt.

[0074] In the mixed molten salt system, CO2 generated by the decomposition of CO32- etches the starch carbon layer at a low temperature stage to form hierarchical pores (micropores-mesopores synergistically) and improve the diffusion efficiency. At a high temperature, CO32- reacts with the carbon skeleton to generate carboxyl and hydroxyl groups, which capture Tl+ / Tl3+ through complexation. The residual K+ can exchange with Tl+ to significantly improve the adsorption kinetics. The three synergistically improve the adsorption performance of Tl+.

[0075] The traditional biochar raw materials (such as wood and straw) have low porosity, while corn starch is more prone to form developed pores due to its high carbon content. At the same time, through the gradient temperature rising method, the pore structure of the corn starch itself is retained at a low temperature pyrolysis, and CO2 release is promoted to form pores; at a high temperature stage, K2CO3 reacts with the carbon skeleton to generate active sites, avoiding the collapse of the pores due to excessive graphitization.

[0076] The second embodiment:

[0077] Please refer to Figures 1 to 6 , Figure 9 and Figure 10 , the water treatment equipment based on the thallium removal agent of modified biochar includes a treatment box 1, a driving mechanism 6 and a feeding mechanism 7.

[0078] An inlet pipe 11 is mounted on the side wall of the treatment box 1.

[0079] A top plate 2 is mounted on the upper surface of the treatment box 1 through bolts, the driving mechanism 6 includes a moving plate 61, a driving motor 64 is mounted on the upper surface of the moving plate 61 through bolts, a positioning cover 63 is fixed on the upper surface of the moving plate 61 and located at one side of the driving motor 64, a first mounting plate 71, a feeding bin 72 and a second mounting plate 73 are mounted on the outer wall of the positioning cover 63 through bolts, a driving rod 74 is connected with the output shaft key groove of the driving motor 64 close to one side of the positioning cover 63, a first gear 75 is connected with the outer wall key groove of the driving rod 74, a driven rod 715 is rotatably connected with the inside of the first mounting plate 71 and located above the driving rod 74, a second gear 76 is connected with the outer wall key groove of the driven rod 715, a top pipe 77 is fixed on the top of the feeding bin 72, a discharge pipe 710 is fixed on the bottom of the feeding bin 72, a first rotating plate 712 and a second rotating plate 713 are respectively connected with the outer wall key grooves of the driving rod 74 and the driven rod 715 inside the feeding bin 72, grinding sleeves 714 are mounted on the inside of the first rotating plate 712 and the second rotating plate 713 through bolts, and a first feeding pipe 78 and a second feeding pipe 79 are mounted on the top flange of the top pipe 77.

[0080] Please refer to Figure 1 and Figure 3 : the dosage of the molten salt modified biochar thallium removal agent is 0.2-1g / L based on the volume of the lithium mica brine, and the adsorption time is 2-24h, and the molten salt modified biochar thallium removal agent used in this embodiment is derived from the thallium removal agent in the first embodiment;

[0081] Secondly, the pH of the wastewater is adjusted to alkaline (9-10) by adding lime or sodium hydroxide, and the user mainly adds the lithium mica brine to be treated into the inside of the treatment box 1 through the inlet pipe 11 during use;

[0082] Please refer to Figure 5 : the molten salt modified biochar thallium removal agent and lime or sodium hydroxide can be separately conveyed in the first feeding pipe 78 and the second feeding pipe 79, so that the two kinds of solid materials enter the feeding bin 72 through the top pipe 77;

[0083] The starting drive motor 64 can control the driving rod 74 to rotate counterclockwise, and the counterclockwise rotating driving rod 74 can control the first gear 75 to rotate counterclockwise and engage the transmission control second gear 76 to drive the driven rod 715 to rotate clockwise;

[0084] Please refer to Figure 6 : the driving rod 74 rotates counterclockwise, and the driven rod 715 rotates clockwise, so as to realize the counterclockwise rotation of the first rotating plate 712, and the clockwise rotation of the second rotating plate 713.

[0085] The shaft centers of the first gear 75 and the second gear 76 are rotatably connected with the first mounting plate 71 through bearings, and the two ends of the driving rod 74 and the driven rod 715 are rotatably connected with the second mounting plate 73 and the positioning cover 63 through bearings.

[0086] The length of the first rotating plate 712 is longer than the length of the second rotating plate 713, and there is a gap between the two side limit positions of the second rotating plate 713 and the inner wall of the discharging bin 72, and the first gear 75 and the second gear 76 are engaged with each other.

[0087] Please refer to Figure 9 : when the first rotating plate 712 and the second rotating plate 713 are in the initial state, the first rotating plate 712 and the second rotating plate 713 are in the horizontal direction, and the inner wall of the discharging bin 72 is designed in a circular arc shape, and there is a gap a between the two side positions of the second rotating plate 713 and the inner wall of the discharging bin 72, and the two sides of the first rotating plate 712 are in a state of adhesion with the inner wall of the discharging bin 72;

[0088] Please refer to Figure 10 : the molten salt modified biochar thallium removal agent and lime or sodium hydroxide dropped from the top pipe 77 fall on the second rotating plate 713, and with the clockwise rotation of the second rotating plate 713, the solid material is driven to the inner wall of the discharging bin 72, realizing that one side of the rotating second rotating plate 713 grinds the solid material in the form of lumps or blocks to the volume of the solid material with a value of a;

[0089] After grinding, the solid material is rotated to the first rotating plate 712, and then the first rotating plate 712 rotates counterclockwise to drive the solid material to contact the inner wall of the discharging bin 72 to grind the solid material to a fine powder state, and finally with the continuous rotation of the first rotating plate 712, the treated solid material is dropped from the discharge pipe 710 into the treatment box 1.

[0090] It can be understood that in combination with Figure 5 and Figure 6 It can be seen that the first gear 75 and the second gear 76 are fully enclosed in the interior of the positioning cover 63, which can ensure stable transmission and also can well protect the first gear 75 and the second gear 76;

[0091] And the grinding sleeve 714 adopts a detachable design, which is convenient for users to disassemble and assemble the excessively worn grinding sleeve 714.

[0092] Compared with the traditional direct dosing design, the present application first designs two independent pipes for the dosing of the thallium removal agent for molten salt modified biochar and lime or sodium hydroxide in the internal part of the feeding bin 72. Although the internal part of the feeding bin 72 is provided with two first rotating plates 712 and second rotating plates 713 which are the same in structure, the length of the first rotating plate 712 is longer than that of the second rotating plate 713, forming a gap between the second rotating plate 713 and the inner wall of the feeding bin 72. Therefore, the first step can grind the solid material into an equal volume of solid material for the large blocks and the solid material formed during the conveying process.

[0093] Secondly, the second rotating plate 713 forms a two-stage grinding into a fine powder state and is poured into the treatment box 1. Such a design makes the dosing method have the functions of mixing, grinding and discharging integrated operation, and the thallium removal agent for molten salt modified biochar and lime or sodium hydroxide is more beneficial to contact and dissolve with the lepidolite brine in the treatment box, ensuring that the water body can fully realize adsorption and maximize the utilization rate of the thallium removal agent for molten salt modified biochar, ensuring efficient thallium removal. In addition, it can also adjust the pH value of the entire water body, effectively removing the thallium element in the lepidolite brine, avoiding water pollution, and being conducive to environmental protection.

[0094] The working principle of the present application is that the thallium removal agent for molten salt modified biochar and lime or sodium hydroxide can be separately conveyed through the first feeding pipe 78 and the second feeding pipe 79 (the first feeding pipe 78 and the second feeding pipe 79 prefer to adopt a hose design, and the length of the first feeding pipe 78 and the second feeding pipe 79 can be designed according to the length of the treatment box 1, and the thallium removal agent for molten salt modified biochar and lime or sodium hydroxide can be independently stored in a tank, and vacuum conveying is preferred). In this way, the two kinds of solid materials will enter the feeding bin 72 through the top pipe 77.

[0095] The driving motor 64 rotates counterclockwise to control the driving rod 74 to rotate counterclockwise. The counterclockwise rotating driving rod 74 controls the first gear 75 to rotate counterclockwise and simultaneously engages the transmission control second gear 76 to drive the driven rod 715 to rotate clockwise, finally grinding the powder in the feeding bin 72 into a fine powder state and pouring it into the treatment box 1 for thallium removal and adsorption.

[0096] Third embodiment:

[0097] Please refer to Figure 7 , Figure 8 and Figure 11The upper surface of the top plate 2 is respectively provided with a rack 3 and a limiting plate 4, one end of the output shaft of the driving motor 64 is connected with a guide wheel 65 through a key groove away from the positioning cover 63, the upper surface of the moving plate 61 and located at one side of the positioning cover 63 is fixedly provided with a side plate 62, and the bottom of the moving plate 61 is rotatably connected with a plurality of rollers 67.

[0098] The axis of the guide wheel 65 is rotatably connected with the side plate 62 through a bearing, the outer wall of the guide wheel 65 is tightly combined with the inner wall of the limiting plate 4, and the plurality of rollers 67 are in contact with the upper surface of the top plate 2.

[0099] Please refer to Figure 7 : During the working process of the second embodiment, when the driving motor 64 rotates counterclockwise, the guide wheel 65 on one side will also rotate counterclockwise in the limiting plate 4;

[0100] Preferably, the guide wheel 65 can be made of rubber material;

[0101] Secondly, the first gear 75 is in meshing state with the rack 3, and the first gear 75 rotates counterclockwise on the rack 3 at the same time as the guide wheel 65 rotates counterclockwise in the limiting plate 4, so that the entire moving plate 61 and the discharging bin 72 move horizontally from the right side of the rack 3 to the left side;

[0102] It also includes a scattering mechanism 8, which includes a mounting frame 81 mounted on the outer wall of the second mounting plate 73, the inside of the mounting frame 81 and located at the outer end key groove of the driving rod 74 is connected with a driving gear 82, one side of the driving gear 82 is connected with a driven gear 83, the axis of the driven gear 83 is connected with a rotating rod 84 through a key groove, the bottom end of the rotating rod 84 is fixedly provided with a scattering disc 85, and the outer wall of the discharge pipe 710 is fixedly provided with a baffle 711.

[0103] The outer wall of the rotating rod 84 is rotatably connected with the mounting frame 81 through a bearing, and the two sides of the baffle 711 are arranged at forty-five degrees about the vertical direction of the axis of the discharge pipe 710.

[0104] Please refer to Figure 11 : During the working process of the first embodiment, the powder from the discharge pipe 710 will fall evenly on both sides of the scattering disc 85 through the baffle 711, and at the same time, the driving rod 74 will drive the driving gear 82 to rotate and drive the driven gear 83 to rotate in the mounting frame 81, so as to realize the rotating motion of the rotating rod 84 and the scattering disc 85.

[0105] The embodiment: on the basis of the first embodiment, the driving motor 64 rotates counterclockwise, and the moving trajectory of the entire moving plate 61 and the discharge bin 72 can be changed, and it can move from the rightmost side in the initial state to the left side. During the movement, the powder processed in the first embodiment can be rotated and scattered in the inside of the processing box 1;

[0106] Therefore, the moving and scattering work can be integrated, the moving trajectory can be formed freely according to the length of the processing box 1, the powder is uniformly distributed on the scattering disc 85 by the scattering front plate 711 before scattering, the powder is scattered on the water in the processing box 1 by the rotation of the scattering disc 85, the powder distribution is more uniform, and the effect of adsorbing and removing thallium is further improved. The uneven mixing of the thallium removal machine can be avoided. When falling on the scattering disc 85, the powder will first pass through the baffle 711 to both sides, so that the powder can be more dispersed, and the scattering can be more uniform.

[0107] Please refer to Figure 1 and Figure 7 : In actual use, the discharge bin 72 is not limited to conveying powder, and liquid cleaning liquid can also be added in the discharge bin 72 in actual use. At this time, the rotation direction of the first rotating plate 712 and the second rotating plate 713 is changed, the liquid can be pumped into the inside of the processing box 1, so that the water washing function is formed. When the processing box 1 is used for a long time for removing thallium, the inner wall of the processing box 1 can be pumped and washed according to the actual situation.

[0108] Fourth embodiment:

[0109] Please refer to Figure 4 , Figure 7 , Figures 12 to 13 , further comprising a reciprocating mechanism 9, the side wall of the processing box 1 is provided with a discharge pipe 10, the reciprocating mechanism 9 comprises a filter plate 95 fixed to the inner wall of the processing box 1 and in the same horizontal direction as the discharge pipe 10, the two sides of the filter plate 95 are fixedly provided with positioning plates 96, the opposite side of the positioning plate 96 is slidably connected with a lever frame 97, the inner wall of the processing box 1 and located above the filter plate 95 is fixedly provided with two slide rods 91, the outer wall of the two slide rods 91 is slidably connected with a reciprocating plate 92, the outer wall of the two slide rods 91 and located on one side of the reciprocating plate 92 is sleeved with two reset springs 93, and the bottom of the reciprocating plate 92 is rotatably connected with a connecting plate 94;

[0110] The two sides of the two reset springs 93 are fixedly connected with the inner wall of the processing box 1 and the reciprocating plate 92, the bottom end of the connecting plate 94 is rotatably connected with the outer wall of the lever frame 97, the side wall of the moving plate 61 is fixedly provided with a resisting plate 66, and the inside of the top plate 2 is provided with a sliding groove 5.

[0111] Please refer toFigure 7 : In the working process of the third embodiment, the moving plate 61 will drive the abutting plate 66 to slide in the sliding groove 5 synchronously during the movement of the moving plate 61 on the top plate 2;

[0112] After the spreading is completed, the moving plate 61 is moved from the rightmost side of the top plate 2 to the leftmost side of the top plate 2;

[0113] Please refer to Figure 4 : In the process of treating the lithium mica brine in the treatment box 1, the entire driving mechanism 6 and the discharging mechanism 7 are moved to the leftmost side of the top plate 2 and need to be kept stationary;

[0114] Please refer to Figure 4 and Figure 12 : After the treatment of the lithium mica brine in the treatment box 1 is completed, the water in the treatment box 1 needs to be discharged through the discharge pipe 10. In the process of discharging, the user can reciprocally control the moving plate 61 to drive the abutting plate 66 to reciprocally stress the reciprocating plate 92 on the basis of the third embodiment. When the reciprocating plate 92 is pushed by the abutting plate 66, it will slide along the horizontal direction of the sliding rod 91. At this time, the return spring 93 will be compressed. When the reciprocating plate 92 slides to the left side, it will drive the connecting plate 94 at the bottom to move downward;

[0115] Please refer to Figure 12 and Figure 13 : When the connecting plate 94 moves downward, the bottom end of the connecting plate 94 will abut against the control lever frame 97 to move downward along the vertical direction of the filter plate 95. When the abutting plate 66 moves away from the reciprocating plate 92, the compressed return spring 93 automatically resets the reciprocating plate 92 to the initial state, thereby driving the connecting plate 94 to pull the lever frame 97 to rise along the vertical direction of the filter plate 95.

[0116] It can be understood that in combination with Figure 13 It can be seen that the two sides of the lever frame 97 are slidably connected with the positioning plates 96 on the two sides, and the positioning plates 96 are in the shape of "L" type structure. Such design can ensure that the lever frame 97 can stably slide upward along the vertical direction of the positioning plate 96, and the back of the lever frame 97 can stably adhere to the outer wall of the filter plate 95.

[0117] In this embodiment, after the working of the third embodiment is completed, the lithium mica brine and the modified biochar thallium removal agent mixed with the molten salt in the treatment box 1 are mixed. After the static adsorption process is completed, the user can control the moving plate 61 to move reciprocally;

[0118] The resistance plate 66 drives the reciprocating plate 92 to vertically reciprocate the pole frame 97 along the surface of the filter plate 95, so that the discharge pipe 10 has good sealing function when discharging the lithium mica wastewater. The traditional filter sealing design generally installs a separate filter system at the outer end of the discharge pipe 10. In this case, a filter plate 95 is arranged between the inner wall of the treatment box 1 and the discharge pipe 10 to preliminarily filter the sludge and adsorption groups. In addition, the reciprocating pole frame 97 formed by the driving mechanism 6 and the discharging mechanism 7 moves up and down outside the filter plate 95 during the filtering and discharging process. Thus, the sludge and adsorption groups adsorbed on the mesh of the filter plate 95 are stirred and treated to continue mixing in the lithium mica brine, which can ensure stable discharging of the discharge pipe 10 and avoid secondary blockage.

[0119] The above description is only the preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation, direct / indirect application in other related technical fields within the concept of the present application, and the contents of the present application specification and drawings are included in the patent protection scope of the present application.

Claims

1. A water treatment device based on modified biochar thallium removal agent, characterized in that, Includes a processing box, a drive mechanism, and a feeding mechanism; An inlet pipe is installed on the side wall of the processing box; The upper surface of the processing box is bolted with a top plate. The driving mechanism includes a moving plate. A drive motor is bolted to the upper surface of the moving plate. A positioning cover is fixed to the upper surface of the moving plate and to one side of the drive motor. A first mounting plate, a feeding bin, and a second mounting plate are bolted to the outer wall of the positioning cover. A drive rod is keyway connected to the output shaft of the drive motor near the positioning cover. A first gear is keyway connected to the outer wall of the drive rod. A driven rod is rotatably connected inside the first mounting plate and above the drive rod. A second gear is keyway connected to the outer wall of the driven rod. A top pipe is fixed to the top of the feeding bin. A discharge pipe is fixed to the bottom of the feeding bin. A first rotating plate and a second rotating plate are keyway connected to the outer walls of the drive rod and the driven rod, respectively. Grinding sleeves are bolted to the inner sides of both the first and second rotating plates. A first feed pipe and a second feed pipe are installed on the top flange of the top pipe. It also includes a reciprocating mechanism. A discharge pipe is installed on the side wall of the processing box. The reciprocating mechanism includes a filter plate fixed to the inner wall of the processing box and in the same horizontal direction as the discharge pipe. Positioning plates are fixed on both sides of the filter plate. A lever frame is slidably connected to the opposite side of the positioning plates. Two sliding rods are fixed on the inner wall of the processing box and directly above the filter plate. A reciprocating plate is slidably connected to the outer wall of the two sliding rods. Two return springs are sleeved on the outer wall of the two sliding rods and on one side of the reciprocating plate. A connecting plate is rotatably connected to the bottom of the reciprocating plate. The two return springs are fixedly connected to the inner wall of the processing box and the reciprocating plate on both sides. The bottom end of the connecting plate is rotatably connected to the outer wall of the lever frame. The side wall of the moving plate is fixedly provided with an abutment plate. The top plate has a sliding groove inside.

2. The water treatment equipment based on modified biochar thallium removal agent according to claim 1, characterized in that, The first gear and the second gear are rotatably connected to the first mounting plate at their shaft centers via bearings, and the two ends of the drive rod and the driven rod are rotatably connected to the second mounting plate and the positioning cover via bearings.

3. The water treatment equipment based on modified biochar thallium removal agent according to claim 1, characterized in that, The length of the first rotating plate is longer than the length of the second rotating plate. There is a gap between the two extreme positions of the second rotating plate and the inner wall of the feeding hopper. The first gear and the second gear mesh with each other.

4. The water treatment equipment based on modified biochar thallium removal agent according to claim 1, characterized in that, The top plate is equipped with a rack and a limiting plate on its upper surface. One end of the drive motor output shaft is connected to a guide wheel via a keyway on the side away from the positioning cover. The upper surface of the moving plate is fixed with a side plate on one side of the positioning cover. The bottom of the moving plate is rotatably connected with multiple rollers.

5. The water treatment equipment based on modified biochar thallium removal agent according to claim 4, characterized in that, The guide wheel is rotatably connected to the side plate via a bearing at its axis, the outer wall of the guide wheel is tightly fitted to the inner wall of the limiting plate, and the multiple rollers are in contact with the upper surface of the top plate.

6. The water treatment equipment based on modified biochar thallium removal agent according to claim 1, characterized in that, It also includes a material spreading mechanism, which includes a mounting frame installed on the outer wall of the second mounting plate. A drive gear is connected to the keyway inside the mounting frame and at the outer end of the drive rod. A driven gear is meshed with one side of the drive gear. A rotating rod is connected to the shaft of the driven gear via a keyway. A material spreading disc is fixed at the bottom end of the rotating rod. A baffle is fixed to the outer wall of the discharge pipe.

7. The water treatment equipment based on modified biochar thallium removal agent according to claim 6, characterized in that, The outer wall of the rotating rod is rotatably connected to the mounting frame via bearings, and the two sides of the baffle are set at a 45-degree angle to the axis of the discharge pipe.

8. A method for preparing a thallium removal agent, characterized in that, The modified biochar thallium removal agent is used in the water treatment equipment based on the modified biochar thallium removal agent as described in any one of claims 1-7, and includes the following preparation steps: S1: Ball mill biomass and potassium salt at a mass ratio of 1:(0.5-3), or stir biomass, potassium salt, and pure water at a mass ratio of 1:(0.5-3):10 at 80℃ for 6-12 hours to obtain a mixture. Pyrolyze the mixture under a protective atmosphere to obtain molten salt modified biochar thallium removal agent. The biomass is corn starch. S2: Based on S1, the potassium salt is either potassium chloride or either potassium carbonate or potassium bicarbonate, with a mass ratio of 1:

1. The ball milling time is 0.2-1 h. The pyrolysis method is gradient heating, with the first stage pyrolysis temperature at 300-350℃ and a pyrolysis time of 1-2 h, and the second stage pyrolysis temperature at 550-850℃ and a pyrolysis time of 1-2 h. S3: Based on S2, the pyrolysis process further includes: removing excess potassium salt or dissolved substances present on the surface by dilute hydrochloric acid and deionized water.

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