Defluorination device for pre-deironing liquid

Abstract

The utility model discloses an iron removal pre-liquid defluorination device which comprises a first reaction part, a second reaction part and a defluorination device, the first reaction part is provided with a first reaction cavity for containing iron removal pre-liquid, and the first reaction part selectively conveys zinc powder into the first reaction cavity; the second reaction part is provided with a second reaction cavity communicated with the first reaction cavity, the second reaction cavity is suitable for containing the iron removal pre-liquid flowing out of the first reaction cavity, and the second reaction part can selectively convey limestone milk into the second reaction cavity; and the third reaction piece is provided with a third reaction cavity communicated with the second reaction cavity, the third reaction cavity is suitable for containing the iron removal pre-liquid flowing out of the second reaction cavity, and the third reaction piece can selectively convey a fluorine removal agent into the third reaction cavity. Therefore, the fluorine ions in the iron removal pre-liquid can be efficiently removed.

Description

Technical Field

[0001] The utility model relates to the technical field of defluorination of pre-iron removal liquid, in particular to a defluorination device for pre-iron removal liquid. Background Art

[0002] The recycling process of zinc-containing secondary resources presents difficulties in removing impurities such as fluorine, chlorine, potassium, and sodium. Alkaline washing and water washing of the raw materials almost completely remove chlorine, potassium, and sodium, but the removal effect of fluorine is average. During the reduction leaching of the leached residue, a large amount of fluorine enters the post-reduction solution. After copper precipitation and pre-neutralization, the fluorine is not removed. Therefore, the pre-iron removal solution contains a large amount of fluorine. If it is directly introduced into the autoclave without treatment, it will cause serious corrosion and damage to the autoclave during the high-temperature and high-pressure process of hematite formation. Therefore, how to remove the impurity element fluorine in the pre-iron removal solution has become an urgent problem to be solved. Utility Model Content

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a defluorination device for a pre-iron removal solution, which can efficiently remove fluoride ions in the pre-iron removal solution.

[0004] According to the defluorination device for the pre-ironing liquid of the embodiment of the present application, it includes: a first reaction piece, the first reaction piece is provided with a first reaction chamber for accommodating the pre-ironing liquid, and the first reaction piece can selectively transport zinc powder into the first reaction chamber; a second reaction piece, the second reaction piece is provided with a second reaction chamber connected to the first reaction chamber, the second reaction chamber is suitable for accommodating the pre-ironing liquid flowing out of the first reaction chamber, and the second reaction piece can selectively transport limestone milk into the second reaction chamber; a third reaction piece, the third reaction piece is provided with a third reaction chamber connected to the second reaction chamber, the third reaction chamber is suitable for accommodating the pre-ironing liquid flowing out of the second reaction chamber, and the third reaction piece can selectively transport a defluorinating agent into the third reaction chamber.

[0005] According to the defluorination device for the pre-iron removal liquid of the embodiment of the present application, by setting the pre-iron removal liquid to flow through the first reaction chamber, the second reaction chamber and the third reaction chamber in sequence, the pre-iron removal liquid can be subjected to multi-step treatment using zinc powder, limestone milk and a defluoridant respectively. The zinc powder can replace indium through the reaction, thereby eliminating the influence of indium on subsequent reactions. The limestone milk can adjust the pH value of the solution to provide conditions for the reaction of the defluoridant, and the defluoridant uses its adsorption and ion exchange capacity to remove fluoride ions in the pre-iron removal liquid, thereby efficiently removing fluoride ions in the pre-iron removal liquid.

[0006] According to some embodiments of the present application, the defluorination device for the pre-iron removal liquid further includes: a filter component, which is connected between the first reaction chamber and the second reaction chamber, and is used to separate and filter the pre-iron removal liquid flowing out of the first reaction chamber.

[0007] According to the defluorination device for the pre-ironing liquid of some embodiments of the present application, the filtering component includes a thickener, the thickener includes a sedimentation piece and a discharge valve, the sedimentation piece is provided with a sedimentation chamber connected to the first reaction chamber, the sedimentation chamber is suitable for accommodating the pre-ironing liquid flowing out of the first reaction chamber and separating the sediment, the discharge valve is connected to the sedimentation chamber, and the discharge valve is used to be selectively opened to form a discharge channel.

[0008] According to the defluorination device for pre-ferrification liquid of some embodiments of the present application, the thickener further includes a stirring separation rod, and the stirring separation rod is arranged in the precipitation chamber.

[0009] According to the defluorination device for the pre-ironing liquid of some embodiments of the present application, the filter assembly further includes an overflow member and a switch member, the overflow member is connected to the sedimentation chamber and is used to accommodate the pre-ironing liquid flowing out of the sedimentation chamber, and the switch member is used to selectively connect the overflow member and the second reaction chamber.

[0010] According to the defluorination device for pre-iron removal liquid in some embodiments of the present application, the switch component is configured to drive a pump.

[0011] According to the defluorination device for the pre-ironing liquid of some embodiments of the present application, the first reaction piece is provided with a first liquid inlet and a first feed inlet which are spaced apart from each other, the first liquid inlet is used to transport the pre-ironing liquid into the first reaction chamber, and the first feed inlet is used to transport zinc powder into the first reaction chamber.

[0012] According to the defluorination device for pre-iron removal liquid in some embodiments of the present application, the first reaction piece is provided with a stirring rod located in the first reaction chamber; and / or, the second reaction piece is provided with a stirring rod located in the second reaction chamber; and / or, the third reaction piece is provided with a stirring rod located in the third reaction chamber.

[0013] According to the defluorination device for pre-ferrification liquid of some embodiments of the present application, a plurality of stirring protrusions are provided at the end of the stirring rod.

[0014] According to the defluorination device for pre-ferrification liquid of some embodiments of the present application, the plurality of stirring protrusions are arranged at intervals in the same plane perpendicular to the stirring rod.

[0015] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 It is a structural schematic diagram of a defluorination device for pre-ferrification liquid according to an embodiment of the present application.

[0018] Reference numerals:

[0019] 100. Fluorination device for pre-iron removal liquid;

[0020] 1. First reaction element; 11. First reaction chamber; 12. First liquid inlet; 13. First material inlet;

[0021] 2. Second reaction element; 21. Second reaction chamber; 22. Second liquid inlet; 23. Second material inlet;

[0022] 3. Third reaction element; 31. Third reaction chamber; 23. Third liquid inlet; 23. Third material inlet;

[0023] 4. Filter assembly; 41. Thickener; 411. Sedimentation element; 412. Discharge valve; 413. Agitator and separator rod; 42. Overflow element; 43. Drive pump;

[0024] 5. Stirring rod; 51. Stirring protrusion. DETAILED DESCRIPTION

[0025] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0026] Hereinafter, with reference to the accompanying drawings, a defluorination device 100 for a pre-iron removal solution according to an embodiment of the present application will be described.

[0027] like Figure 1 As shown, according to the defluorination device 100 of the pre-iron removal liquid of the embodiment of the present application, the defluorination device 100 of the pre-iron removal liquid includes a first reaction member 1, a second reaction member 2 and a third reaction member 3. The first reaction member 1 is provided with a first reaction chamber 11 for accommodating the pre-iron removal liquid, and the first reaction member 1 can selectively transport zinc powder into the first reaction chamber 11. The second reaction member 2 is provided with a second reaction chamber 21 connected to the first reaction chamber 11, and the second reaction chamber 21 is suitable for accommodating the pre-iron removal liquid flowing out of the first reaction chamber 11, and the second reaction member 2 can selectively transport limestone milk into the second reaction chamber 21. The third reaction member 3 is provided with a third reaction chamber 31 connected to the second reaction chamber 21, and the third reaction chamber 31 is suitable for accommodating the pre-iron removal liquid flowing out of the second reaction chamber 21, and the third reaction member 3 can selectively transport a defluoridating agent into the third reaction chamber 31. In this way, fluoride ions in the pre-iron removal liquid can be efficiently removed.

[0028] First, if Figure 1As shown, the defluorination device 100 for the pre-ferrification liquid is provided with a first reaction member 1, a second reaction member 2, and a third reaction member 3. A first reaction chamber 11 is provided in the first reaction member 1. The first reaction chamber 11 is used to accommodate the pre-ferrification liquid. The first reaction member 1 can selectively transport zinc powder into the first reaction chamber 11. The zinc powder can displace indium in the pre-ferrification liquid, thereby eliminating the influence of indium on subsequent reactions.

[0029] A second reaction chamber 21 is provided in the second reaction member 2, and the second reaction chamber 21 is communicated with the first reaction chamber 11. The first reaction chamber 11 can pass the pre-iron removal liquid after indium removal into the second reaction chamber 21. The second reaction chamber 21 can accommodate the pre-iron removal liquid after indium removal, and the second reaction member 2 can selectively transport limestone milk into the second reaction chamber 21. The limestone milk can adjust the pH value of the pre-iron removal liquid to provide conditions for subsequent reactions.

[0030] The third reaction element 3 is provided with a third reaction chamber 31, which is connected to the second reaction chamber 21. The second reaction chamber 21 can pass the pH-adjusted pre-ironing liquid into the third reaction chamber 31. The third reaction chamber 31 can accommodate the pH-adjusted pre-ironing liquid, and the third reaction element 3 can selectively transport a defluorinating agent into the third reaction chamber 31. The defluorinating agent is used to remove fluorine atoms in the pre-ironing liquid.

[0031] In the specific working process, the iron removal pre-liquid can be first introduced into the first reaction chamber 11, and zinc powder can be added into the first reaction chamber 11. The zinc powder can react with the iron removal pre-liquid to precipitate and separate the indium in the iron removal pre-liquid, thereby eliminating the influence of indium on subsequent reactions. The separated indium slag is filtered and recovered, and the iron removal pre-liquid flows to the second reaction chamber 21; after the iron removal pre-liquid flows into the second reaction chamber 21, limestone milk can be added into the second reaction chamber 21. After the limestone milk reacts with the iron removal pre-liquid, gypsum is obtained. At this time The pH value of the pre-ironing liquid is adjusted to a suitable range to provide reaction conditions for the subsequent reaction of the defluorinating agent. The gypsum is filtered and recovered, and the pre-ironing liquid after pH adjustment flows into the third reaction chamber 31. After the pre-ironing liquid flows into the third reaction chamber 31, a defluorinating agent can be added into the third reaction chamber 31. The defluorinating agent removes fluoride ions in the pre-ironing liquid through adsorption and ion exchange capabilities and generates defluoridation slag. The defluoridation slag is filtered and recovered, and the filtered pre-ironing liquid can be used in working conditions such as hematite deironing that require a fluorine-free pre-liquid.

[0032] According to the defluorination device 100 for the pre-iron removal liquid of the embodiment of the present invention, by setting the pre-iron removal liquid to flow through the first reaction chamber 11, the second reaction chamber 21 and the third reaction chamber 31 in sequence, the pre-iron removal liquid can be subjected to multi-step treatment using zinc powder, limestone milk and a defluoridant respectively. The zinc powder can replace indium through the reaction, thereby eliminating the influence of indium on subsequent reactions. The limestone milk can adjust the pH value of the solution to provide conditions for the reaction of the defluoridant, and the defluoridant can remove fluoride ions in the pre-iron removal liquid by using its adsorption and ion exchange capabilities, thereby efficiently removing fluoride ions in the pre-iron removal liquid.

[0033] It should be noted that no wastewater is generated during the entire reaction process, which can reduce water pollution, reduce ecological damage and reduce sewage treatment costs. The pre-iron removal liquid defluorination device 100 can be fully automatically operated or remotely controlled, reducing labor costs.

[0034] like Figure 1 As shown, in some embodiments of the present application, the defluorination device 100 for the pre-iron removal liquid further includes: a filter component 4, which is connected between the first reaction chamber 11 and the second reaction chamber 21, and the filter component 4 is used to separate and filter the pre-iron removal liquid flowing out of the first reaction chamber 11.

[0035] It can be understood that the filter component 4 is arranged between the first reaction chamber 11 and the second reaction chamber 21. The filter component 4 further removes suspended matter, sediment and other solid impurities in the pre-ironing liquid flowing out of the first reaction chamber 11, such as indium slag and zinc powder, to avoid interfering with subsequent chemical reactions, such as affecting the reaction between the pre-ironing liquid and limestone milk, and can reduce the wear of the second reaction chamber 21 and its subsequent processing equipment, thereby extending the service life of the pre-ironing liquid defluorination device 100. The presence of the filter component 4 greatly reduces the risk of pipelines and equipment being blocked by impurities, thereby ensuring the smooth operation of the pre-ironing liquid defluorination device 100.

[0036] like Figure 1 As shown, in some embodiments of the present application, the filter assembly 4 includes a thickener 41, the thickener 41 includes a sedimentation piece 411 and a discharge valve 412, the sedimentation piece 411 is provided with a sedimentation chamber connected to the first reaction chamber 11, the sedimentation chamber is suitable for accommodating the pre-iron removal liquid flowing out of the first reaction chamber 11 and separating the sediment, the discharge valve 412 is located below the sedimentation piece 411 and connected to the sedimentation chamber, the discharge valve 412 is used to be selectively opened to form a discharge channel, the discharge channel can discharge the sediment in the sedimentation chamber to avoid continuous deposition of the sediment in the sedimentation chamber.

[0037] It can be understood that the thickener 41 can more effectively achieve solid-liquid separation, improve sedimentation efficiency, and improve the working efficiency of the pre-iron removal liquid defluorination device 100, and the setting of the discharge valve 412 can make the discharge of sediment more convenient, thereby reducing the operating difficulty of the pre-iron removal liquid defluorination device 100.

[0038] like Figure 1 As shown, in some embodiments of the present application, the thickener 41 further includes an agitating separation rod 413 , and the agitating separation rod 413 is disposed in the sedimentation chamber.

[0039] It can be understood that the stirring separation rod 413 can stir the pre-ironing liquid in the sedimentation chamber. The stirring effect can accelerate the sedimentation rate of the suspended matter, making the entire sedimentation process faster, reducing the processing time, and helping to break up and redistribute the fine particles and impurities suspended in the pre-ironing liquid. The broken particles are more likely to settle to the bottom of the sedimentation chamber under the action of gravity, thereby enhancing the sedimentation effect; the stirring effect can also reduce the thickness of the turbid liquid layer at the top of the sedimentation chamber, so that the separated pre-ironing liquid can quickly flow out from the top, further improving the efficiency of solid-liquid separation.

[0040] like Figure 1 As shown, in some embodiments of the present application, the filter assembly 4 also includes an overflow member 42 and a switch member. The overflow member 42 is connected to the sedimentation chamber and is used to accommodate the pre-iron removal liquid flowing out of the sedimentation chamber. The switch member is used to selectively connect the overflow member 42 and the second reaction chamber 21.

[0041] That is, the overflow member 42 is connected to the sedimentation chamber. During the sedimentation process of the thickener 41, the suspended matter and solid impurities in the pre-ironing liquid will gradually settle to the bottom of the sedimentation chamber to form sediment. The relatively clear pre-ironing liquid will float above the sedimentation chamber and flow into the overflow member 42. The overflow member 42 can be used to accommodate the separated pre-ironing liquid, and the switch member can selectively connect the overflow member 42 and the second reaction chamber 21. Specifically, when the switch member is opened to connect the overflow member 42 with the second reaction chamber 21, the overflow member 42 can centrally pass the pre-ironing liquid into the second reaction chamber 21; and when the switch member is closed to disconnect the overflow member 42 from the second reaction chamber 21, the overflow member 42 will not pass the pre-ironing liquid into the second reaction chamber 21.

[0042] Through the above arrangement, the thickener 41 and the second reaction element 2 can work simultaneously, which is beneficial to improving the working smoothness of the defluorination device 100 for the pre-ironing liquid and improving the working efficiency of the defluorination device 100 for the pre-ironing liquid.

[0043] like Figure 1As shown, in some embodiments of the present application, the switch element is configured as a drive pump 43. It is understandable that by configuring the switch element as the drive pump 43, the drive pump 43 can pump the pre-ironing liquid in the overflow element 42 into the second reaction chamber 21, thereby improving the outflow efficiency of the overflow element 42 and preventing the pre-ironing liquid in the second reaction chamber 21 from flowing back to the overflow element 42, so that the relative position between the overflow element 42 and the second reaction element 2 is more flexible. For example, the overflow element 42 can be disposed below the second reaction element 2, which helps to reduce the difficulty of arranging the pre-ironing liquid defluorination device 100.

[0044] like Figure 1 As shown, in some embodiments of the present application, the first reaction member 1 is provided with a first liquid inlet 12 and a first material inlet 13 which are spaced apart from each other. The first liquid inlet 12 is used to transport the pre-ironing liquid into the first reaction chamber 11, and the first material inlet 13 is used to transport zinc powder into the first reaction chamber 11.

[0045] It can be understood that the first liquid inlet 12 and the first feed inlet 13 are arranged to be spaced apart, which can ensure that the pre-ironing liquid and the zinc powder remain relatively independent before entering the first reaction chamber 11. After the pre-ironing liquid and the zinc powder enter the first reaction chamber 11 through their respective inlets, they will be more fully mixed in the first reaction chamber 11. This diversion and mixing method helps to increase the contact area and reaction rate between the reactants, thereby improving the efficiency of the entire iron removal process. The independent design of the first liquid inlet 12 and the first feed inlet 13 makes it more convenient for maintenance and cleaning. One of the inlets can be cleaned or replaced separately without affecting the normal use of the other inlet. It reduces maintenance costs and time and improves the overall reliability of the equipment.

[0046] For example, the second reaction element 2 is provided with a second liquid inlet 22 and a second material inlet 23, which are spaced apart from each other. The second liquid inlet 22 is used to deliver the pre-iron removal solution into the second reaction chamber 21, and the second material inlet 23 is used to deliver limestone milk into the second reaction chamber 21. The third reaction element 3 is provided with a third liquid inlet 23 and a third material inlet 23, which are spaced apart from each other. The third liquid inlet 23 is used to deliver the pre-fluorination solution into the third reaction chamber 31, and the third material inlet 23 is used to deliver the defluorination agent into the third reaction chamber 31.

[0047] like Figure 1As shown, in some embodiments of the present application, the first reaction member 1 is provided with a stirring rod 5 located in the first reaction chamber 11. It is understandable that by providing the stirring rod 5 in the first reaction chamber 11, after the pre-ironing liquid and the zinc powder are added, the rotational motion of the stirring rod 5 can drive the zinc powder to rotate with the pre-ironing liquid, and the concentration gradient between the zinc powder and the pre-ironing liquid is eliminated through the stirring and rotating mixing, so that the zinc powder and the pre-ironing liquid are more evenly distributed in the reaction chamber, thereby improving the uniformity and consistency of the reaction between the zinc powder and the pre-ironing liquid, so that the zinc powder and the pre-ironing liquid are fully mixed, and the reaction efficiency of the zinc powder and the pre-ironing liquid is improved.

[0048] In some embodiments of the present application, the second reaction member 2 is provided with a stirring rod 5 located in the second reaction chamber 21. It is understandable that by providing the stirring rod 5 in the second reaction chamber 21, after the pre-iron removal liquid flows into the second reaction member 2 and the limestone milk is added, the rotational motion of the stirring rod 5 drives the limestone milk to rotate along with the pre-iron removal liquid in the second reaction member 2, and the concentration gradient between the limestone milk and the pre-iron removal liquid flowing into the second reaction member 2 is eliminated through the stirring and rotating mixing, so that the limestone milk and the pre-iron removal liquid flowing into the second reaction member 2 are more evenly distributed in the reaction chamber, thereby improving the uniformity and consistency of the reaction between the limestone milk and the pre-iron removal liquid flowing into the second reaction chamber 21, so that the limestone milk and the pre-iron removal liquid flowing into the second reaction chamber 21 are fully mixed, and the reaction efficiency of the limestone milk and the pre-iron removal liquid flowing into the second reaction chamber 21 is improved.

[0049] In some embodiments of the present application, the third reaction member 3 is provided with a stirring rod 5 located in the third reaction chamber 31. It is understandable that by providing the stirring rod 5 in the third reaction chamber 31, after the pre-ironing liquid flows into the third reaction member 3 and the defluorinating agent is added, the rotational motion of the stirring rod 5 drives the defluorinating agent and the pre-ironing liquid in the third reaction member 3 to rotate, and the concentration gradient between the defluorinating agent and the pre-ironing liquid flowing into the third reaction member 3 is eliminated through the stirring and rotating mixing, so that the defluorinating agent and the pre-ironing liquid flowing into the third reaction member 3 are more evenly distributed in the reaction chamber, thereby improving the uniformity and consistency of the reaction between the defluorinating agent and the pre-ironing liquid flowing into the third reaction chamber 31, so that the defluorinating agent and the pre-ironing liquid flowing into the third reaction chamber 31 are fully mixed, and the reaction efficiency of the defluorinating agent and the pre-ironing liquid flowing into the third reaction chamber 31 is improved.

[0050] like Figure 1 As shown, in some embodiments of the present application, a plurality of stirring protrusions 51 are provided at the end of the stirring rod 5 .

[0051] The design of the stirring protrusions 51 further enhances the stirring effect, allowing the various components in the pre-ironing solution to be evenly distributed, thereby improving the efficiency of chemical reactions and physical effects. Due to the improved mixing efficiency, the components in the pre-ironing solution can react with the additives more quickly, thereby shortening the reaction time of the entire treatment process.

[0052] like Figure 1 As shown, in some embodiments of the present application, a plurality of stirring protrusions 51 are arranged at intervals in the same plane perpendicular to the stirring rod 5 .

[0053] It is understandable that the stirring protrusions 51 are distributed in a plane perpendicular to the stirring rod 5, and when the stirring rod 5 rotates, the contact area and strength of the stirring rod 5 can be increased. These protrusions can more effectively cut into the solid particles and liquid in the pre-ironing liquid. This enhanced stirring intensity helps to promote a more uniform mixing of the substances in the pre-ironing liquid, thereby improving the stirring efficiency. The stirring protrusions 51 arranged at intervals can cover a wider stirring area and reduce blind spots during the stirring process. This means that each part of the pre-ironing liquid can be fully stirred to ensure the consistency of the overall treatment effect.

[0054] In some embodiments of the present application, the steps of the defluorination method of the pre-iron removal liquid defluorination device 100 are as follows:

[0055] Step 1: Ensure that the first reaction part 1, the second reaction part 2 and the third reaction part 3 are all in a usable state, and prepare sufficient zinc powder, limestone milk and defluoridating agent.

[0056] Step 2: Inject the pre-ironing solution to be treated into the first reaction chamber 11 of the first reaction element 1, and selectively transport zinc powder into the first reaction chamber 11 to perform a preliminary reaction treatment. It should be noted that, in order to ensure the smooth progress of the reaction, after the zinc powder is added, the pH value of the pre-ironing solution should be in the range of 4.5 to 5.0, such as the pH value of the pre-ironing solution can be set to 4.5, 4.6, 4.7, 4.8, 4.9, and 5.0, and the reaction temperature of the pre-ironing solution can be in the range of 70°C to 75°C, such as the reaction temperature of the pre-ironing solution can be set to 70°C, 71°C, 72°C, 73°C, 74°C, and 75°C, the particle size of the zinc powder is 200 mesh, and the addition coefficient of the zinc powder is in the range of 1.1 to 1.3, such as the addition coefficient of the zinc powder can be set to 1.1, 1.2, and 1.3, etc.

[0057] Step 3: Allow the pre-iron removal solution, after treatment in the first reaction chamber 11, to flow into the second reaction chamber 21 of the second reaction element 2. Limestone milk is selectively transported into the second reaction chamber 21 for further reaction treatment. It should be noted that to ensure the smooth progress of the reaction, before adding the limestone milk, limestone and water are slurried in a certain proportion to obtain limestone milk. The mass fraction of the limestone milk should be in the range of 25% to 50%. For example, the mass fraction of the limestone milk can be set to 25%, 30%, 35%, 40%, 45%, and 50%. After adding the limestone milk to the pre-iron removal solution, it is necessary to ensure that the pH at the reaction endpoint in the second reaction element 2 is in the range of 5.0 to 5.5. For example, the pH at the reaction endpoint in the second reaction element 2 can be 5.0, 5.1, 5.2, 5.3, 5.4, and 5.5.

[0058] Step 4: The pre-iron removal solution, after being treated in the second reaction chamber 21, is flowed into the third reaction chamber 31 of the third reaction element 3. A defluorinating agent is selectively delivered into the third reaction chamber 31 to remove fluoride from the pre-iron removal solution. It should be noted that, to ensure the smooth progress of the reaction, the reaction temperature of the de-iron removal solution in the third reaction element 3 is in the range of 70°C to 75°C. For example, the reaction temperature of the pre-iron removal solution in the third reaction element 3 can be set to 70°C, 71°C, 72°C, 73°C, 74°C, and 75°C. The concentration of the defluorinating agent should be in the range of 1.8 g / L to 2.0 g / L. For example, the concentration of the defluorinating agent can be set to 1.8 g / L, 1.9 g / L, and 2.0 g / L.

[0059] Step 5: After the deironing pre-liquid is treated in the third reaction chamber 31 , the fluoride content thereof should be reduced to a desired level. The treated deironing pre-liquid is collected and stored for subsequent use or further processing.

[0060] In Example 1, the composition of the pre-iron removal solution is as follows: 0.25 g / L fluorine, 0.38 g / L chlorine, 0.087 g / L indium, 15.4 g / L iron, 10.28 g / L magnesium, and a pH of 2.51. In the first reaction element (1), 200-mesh zinc powder is added to the pre-iron removal solution at a factor of 1.1. The reaction temperature is controlled at 75°C, the pH of the pre-iron removal solution is 4.5, and indium slag is obtained by filtration. In the second reaction element (2), the pH of the pre-iron removal solution is adjusted to 5.3 using 25% limestone emulsion, the reaction temperature is controlled at 70°C to 75°C, and gypsum is obtained by filtration. The pre-iron removal solution, which flows into the third reaction element (3), is mixed with 2 g / L of a defluoridating agent for reaction, and filtered to obtain a pre-iron removal solution containing 0.045 g / L fluorine and a defluoridation slag. The defluoridation slag can be recycled through desorption, and the pre-iron removal solution is directly used in the hematite deferrification process. In this embodiment, the precipitation rate of indium is above 99%, the removal rate of fluorine is 82%, and the fluorine adsorption amount is 102 mg / g.

[0061] In Example 2, the composition of the pre-iron removal solution is as follows: 0.15 g / L fluorine, 0.091 g / L indium, 0.28 g / L chlorine, 13.4 g / L iron, 12.28 g / L magnesium, and a pH of 3.51. In the first reaction element (1), 200-mesh zinc powder is added to the pre-iron removal solution at a factor of 1.3. The reaction temperature is controlled at 75°C, the pH of the pre-iron removal solution is 4.8, and indium slag is obtained by filtration. In the second reaction element (2), the pH of the pre-iron removal solution is adjusted to 5.5 using 25% limestone emulsion, the reaction temperature is controlled at 70°C to 75°C, and gypsum is obtained by filtration. The pre-iron removal solution, which flows into the third reaction element (3), is mixed with 1.8 g / L of a defluoridating agent for reaction, and filtered to obtain a pre-iron removal solution containing 0.055 g / L fluorine and a defluoridation slag. The defluoridation slag can be recycled through desorption, and the pre-iron removal solution is directly used in the hematite deironing process. In this embodiment, the precipitation rate of indium is above 99%, the removal rate of fluorine is 63%, and the fluorine adsorption amount is 48 mg / g.

[0062] In Example 3, the composition of the pre-iron removal solution is as follows: 0.30 g / L fluorine, 0.078 g / L indium, 0.35 g / L chlorine, 14.6 g / L iron, 11.8 g / L magnesium, and a pH of 4.11. In the first reaction element (1), 200-mesh zinc powder is added to the pre-iron removal solution at a factor of 1.2. The reaction temperature is controlled at 75°C, the pH of the pre-iron removal solution is 5.0, and indium slag is obtained by filtration. In the second reaction element (2), the pH of the pre-iron removal solution is adjusted to 5.5 using 50% limestone milk, the reaction temperature is controlled at 70°C to 75°C, and gypsum is obtained by filtration. The pre-iron removal solution, which flows into the third reaction element (3), is mixed with 2 g / L of a defluoridating agent for reaction, and filtered to obtain a pre-iron removal solution containing 0.085 g / L fluorine and a defluoridating slag. The defluoridating slag can be recycled through desorption, and the pre-iron removal solution is directly used in the hematite deironing process. In this embodiment, the precipitation rate of indium is above 99%, the removal rate of fluorine is 72%, and the fluorine adsorption amount is 107 mg / g.

[0063] In Example 4, the composition of the pre-iron removal solution is as follows: 0.21 g / L fluorine, 0.091 g / L indium, 0.35 g / L chlorine, 12.6 g / L iron, 13.28 g / L magnesium, and a pH of 4.51. In the first reaction element (1), 200-mesh zinc powder is added to the pre-iron removal solution at a factor of 1.1. The reaction temperature is controlled at 75°C, the pH of the pre-iron removal solution is adjusted to 5.0, and indium slag is obtained by filtration. In the second reaction element (2), the pH of the pre-iron removal solution is adjusted to 5.5 using 50% limestone emulsion, the reaction temperature is controlled at 70°C to 75°C, and gypsum is obtained by filtration. The pre-iron removal solution, which flows into the third reaction element (3), is mixed with 2 g / L of a defluoridating agent for reaction, and filtered to obtain a pre-iron removal solution containing 0.038 g / L fluorine and a defluoridating slag. The defluoridating slag can be recycled through desorption, and the pre-iron removal solution is directly used in the hematite deironing process. In this embodiment, the precipitation rate of indium is above 99%, the removal rate of fluorine is 82%, and the fluorine adsorption amount is 86 mg / g.

[0064] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application 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 present application. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0065] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0066] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0067] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A defluorination device for pre-iron removal liquid, characterized in that: include: A first reaction member (1), wherein the first reaction member (1) is provided with a first reaction chamber (11) for accommodating a pre-iron removal liquid, and the first reaction member (1) can selectively transport zinc powder into the first reaction chamber (11); a second reaction element (2), the second reaction element (2) being provided with a second reaction chamber (21) communicating with the first reaction chamber (11), the second reaction chamber (21) being adapted to accommodate the pre-iron removal liquid flowing out of the first reaction chamber (11), and the second reaction element (2) being capable of selectively conveying limestone milk into the second reaction chamber (21); A third reaction piece (3), wherein the third reaction piece (3) is provided with a third reaction chamber (31) connected to the second reaction chamber (21), the third reaction chamber (31) is suitable for accommodating the pre-iron removal liquid flowing out of the second reaction chamber (21), and the third reaction piece (3) can selectively transport a defluorinating agent into the third reaction chamber (31).

2. The defluorination device for pre-iron removal according to claim 1, characterized in that: Also includes: A filter assembly (4), the filter assembly (4) being connected between the first reaction chamber (11) and the second reaction chamber (21), the filter assembly (4) being used for separating and filtering the pre-iron removal liquid flowing out of the first reaction chamber (11).

3. The defluorination device for pre-iron removal according to claim 2, characterized in that: The filter assembly (4) includes a thickener (41), the thickener (41) includes a sedimentation element (411) and a discharge valve (412), the sedimentation element (411) is provided with a sedimentation chamber connected to the first reaction chamber (11), the sedimentation chamber is suitable for accommodating the pre-iron removal liquid flowing out of the first reaction chamber (11) and separating the sediment, the discharge valve (412) is connected to the sedimentation chamber, and the discharge valve (412) is used to be selectively opened to form a discharge channel.

4. The defluorination device for pre-iron removal according to claim 3, characterized in that: The thickener (41) further comprises a stirring separation rod (413), and the stirring separation rod (413) is arranged in the precipitation chamber.

5. The defluorination device for pre-iron removal according to claim 3, characterized in that: The filter assembly (4) further comprises an overflow member (42) and a switch member, wherein the overflow member (42) is connected to the sedimentation chamber and is used to accommodate the pre-iron removal liquid flowing out of the sedimentation chamber, and the switch member is used to selectively connect the overflow member (42) and the second reaction chamber (21).

6. The defluorination device for pre-iron removal liquid according to claim 5, characterized in that: The switch member is configured to drive a pump (43).

7. The defluorination device for pre-iron removal liquid according to claim 1, characterized in that: The first reaction element (1) is provided with a first liquid inlet (12) and a first material inlet (13) which are spaced apart from each other. The first liquid inlet (12) is used to transport pre-iron removal liquid into the first reaction chamber (11), and the first material inlet (13) is used to transport zinc powder into the first reaction chamber (11).

8. The defluorination device for pre-iron removal according to any one of claims 1 to 7, characterized in that: The first reaction piece (1) is provided with a stirring rod (5) located in the first reaction chamber (11); and / or, the second reaction piece (2) is provided with a stirring rod (5) located in the second reaction chamber (21); and / or, the third reaction piece (3) is provided with a stirring rod (5) located in the third reaction chamber (31).

9. The defluorination device for pre-iron removal according to claim 8, characterized in that: The end of the stirring rod (5) is provided with a plurality of stirring protrusions (51).

10. The defluorination device for pre-iron removal liquid according to claim 9, characterized in that: The plurality of stirring protrusions (51) are arranged at intervals in the same plane perpendicular to the stirring rod (5).

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