Processing system for preparing sodium silicate by using iron tailings sand

Abstract

The application provides a processing system for preparing sodium silicate by using iron tailings, compared with the prior art, the application comprises an initial screening module for receiving crushed particles of a solid sodium silicate crude product and performing screening and rolling pressure treatment on the crushed particles, a reaction tank for receiving the crushed particles treated by the initial screening module, a stirrer for performing stirring treatment in the reaction tank, a first quantitative liquid feeder for quantitatively adding pure water into the reaction tank, a heater for performing heating treatment on the reaction tank, a circulating flow module for discharging filtrate in the reaction tank to outside of the reaction tank while storing filtrate in the reaction tank, a liquid discharge pipe for discharging liquid sodium silicate in the reaction tank to outside of the reaction tank, and a discharge valve for controlling the communication between the liquid discharge pipe and the reaction tank. The application adopts efficient screening and rolling pressure design, and improves the preparation efficiency of the sodium silicate product through wave airflow output, ultrasonic vibration and dynamic limiting plate adjustment.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of sodium silicate production, and in particular to a processing system for preparing sodium silicate by using iron tailings sand. BACKGROUND

[0002] Iron tailings are solid wastes generated in the mineral processing process and are an important part of global industrial solid wastes. According to statistics, more than 10 billion tons of tailings and waste rocks are discharged worldwide every year, among which the comprehensive utilization rate of tailings in China is only 7%, and the amount of stacked iron tailings reaches more than 10 billion tons, accounting for nearly one-third of the total amount of tailings. These stacked iron tailings not only occupy a large amount of land resources, but also may cause environmental pollution, so how to efficiently utilize the iron tailings resources has become a research hotspot in the current industry and academia. The application is dedicated to the comprehensive utilization of solid wastes and focuses on solving the problem of high-value utilization of iron tailings. The separated iron tailings sand is mixed with sodium hydroxide, and then subjected to a melting reaction at 700-850 DEG C for 30-40 minutes to obtain a solid sodium silicate crude product. Subsequently, the solid sodium silicate crude product is dissolved in warm water at 60-80 DEG C, and a high-purity sodium silicate solution is obtained through simple filtration, and a solid sodium silicate is obtained by further water removal. The innovation of the application lies in that the high-iron-content iron tailings sand is used as a raw material for the first time, which not only reduces the accumulation of solid wastes, but also realizes the high-value utilization of iron tailings; a low-temperature rapid preparation process of sodium silicate is developed, and the melting time is as short as 30-40 minutes; and through warm water dissolution and simple filtration, efficient and low-energy-consumption post-processing is realized to obtain a high-purity sodium silicate product.

[0003] The experimental team has long been engaged in the research on the related technology of iron tailings processing, and has carried out a large number of related experiments by relying on relevant resources. Through a large amount of retrieval, it is found that the existing technologies such as CN104556079B, CN113058284B, CN113731624B and CN117599891A exist, such as the existing technology discloses a granulating and crystallizing device for the preparation process of sodium metasilicate, which relates to the technical field of sodium metasilicate production equipment, and comprises a crystallizing tank, a discharging mechanism, a granulating and crystallizing mechanism, a wall scraping mechanism, a motor arranged at the top end of the crystallizing tank, a slag discharge pipe arranged at the bottom end of the crystallizing tank, a slag discharge valve arranged on one side of the outer wall of the slag discharge pipe, and a cooling liquid inlet pipe, a raw liquid inlet pipe and a seed crystal inlet pipe arranged on one side of the outer wall of the crystallizing tank. The present application can realize the rapid separation of crystalline particles by setting the crystallizing tank, the crystallizing bin, the motor, the filter plate, the water suction cylinder, the water suction groove hole, the rotating shaft, the spiral blade, the first connecting rod, the stirring rod, the second connecting rod, the vertical scraper, the raw liquid inlet pipe and the seed crystal inlet pipe, and effectively improves the working efficiency of sodium metasilicate crystallization.

[0004] This invention addresses the common problems in the field, such as reliance on fixed physical and mechanical designs without integrated intelligent sensors or data acquisition modules, which prevent real-time acquisition of key parameters during production; the lack of intelligent feedback mechanisms, which prevents automatic adjustment of parameters to optimize production efficiency based on changes during production, potentially leading to unstable product quality. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings existing in the field by proposing a processing system for preparing sodium silicate using iron tailings.

[0006] To overcome the shortcomings of the prior art, the present invention adopts the following technical solution:

[0007] A processing system for preparing sodium silicate from iron tailings, comprising the following steps:

[0008] Step 1: After thoroughly mixing the iron ore tailings and sodium hydroxide, the mixture is fed into a horseshoe flame furnace for a melting reaction at 700-850 degrees Celsius.

[0009] Step 2: After the iron ore tailings and sodium hydroxide are melted, the resulting molten material remains in the furnace for 30-40 minutes to obtain solid crude sodium silicate. The solid crude sodium silicate is then crushed into granules using a crusher.

[0010] Step 3: Add the crushed particles to pure water and slowly heat to 60-80 degrees Celsius to dissolve them, obtaining a solution. Filter out the filtrate from the solution and use the filtrate as liquid sodium silicate.

[0011] Step 4: Add a mixed acid solution dropwise to liquid sodium silicate to produce a snowflake-like precipitate of silicic acid, obtaining a mixed solution. The mixed acid is selected from any one or a combination of two or more of sulfuric acid, hydrochloric acid, and nitric acid.

[0012] Step 5: After washing the mixed solution twice with pure water to remove the silica precipitate, filter the solution to obtain a white, crude filter cake.

[0013] Step 6: Dehydrate the white filter cake at a temperature below 60 degrees Celsius to obtain ultrapure silica solid powder;

[0014] The feature is that the processing system for preparing sodium silicate using iron tailings includes:

[0015] The primary screening module receives the crushed particles and performs screening and rolling treatment on the crushed particles, the reaction tank receives the crushed particles treated by the primary screening module, the stirrer performs stirring treatment in the reaction tank, the first quantitative liquid feeder quantitatively adds pure water into the reaction tank, the heater performs heating treatment on the reaction tank, the flow circulation module discharges the filtrate in the reaction tank to the outside of the reaction tank while retaining the filtrate in the reaction tank, the liquid discharge pipe is used to discharge the liquid sodium silicate in the reaction tank to the outside of the reaction tank, and the discharge valve is used to control the communication of the liquid discharge pipe and the reaction tank.

[0016] Further, the primary screening module comprises a box body with a communication opening at the upper and lower ends, a funnel member arranged in communication with the top of the box body and the lower end of the box body and arranged in communication with the reaction tank, a fixed frame sleeved on the outer wall of the box body, a buffer spring column with the top end connected and fixed with the fixed frame and the bottom end fixedly connected with the top wall of the tank of the reaction tank, a filter plate horizontally arranged in the box body, a moving plate horizontally penetrating through one of the side walls of the box body and internally provided with an airflow channel, a rolling assembly fixedly arranged with the moving plate and used to repeatedly roll the crushed particles on the filter plate, a plurality of ultrasonic generators respectively arranged on the outer wall of the box body, a moving drive unit used to drive the moving plate to move horizontally back and forth, and an air inlet unit used to perform airflow transmission on the airflow channel in the moving plate.

[0017] Further, a through hole is arranged on the side wall of the box body, the moving plate is horizontally arranged through the through hole, and the inner wall of the through hole is uniformly embedded with balls to reduce the resistance of the moving plate during horizontal movement.

[0018] Further, the moving drive unit comprises a vertical plate located outside the box body and vertically fixed to the bottom wall of the moving plate, a linear hydraulic motor fixed to the side wall of the box body through a corresponding mounting seat and horizontally telescopic, and a locking member used to fixedly connect the driving end of the linear hydraulic motor with the vertical plate, the linear hydraulic motor drives the moving plate to stably horizontally move back and forth in the through hole through telescopic action.

[0019] Further, the rolling assembly comprises a base plate located in the box body and horizontally arranged on the bottom wall of the moving plate, at least two rolling rods fixedly arranged on the bottom of the base plate through corresponding bearing seats and rotatable, a limiting plate vertically arranged below the base plate, a telescopic driving member with the top end fixedly connected with the base plate and the bottom end fixedly connected with the limiting plate, and an insulation sleeve sleeved on the outer wall of the telescopic driving member, and the initial posture of the rolling assembly is that the limiting plate is in abutment with the side wall of the box body provided with the through hole.

[0020] The limiting plate mainly has the effects of intercepting the crushing particles that are not crushed to the preset particle size and piling them in the rolling area between the rolling roller and the box to form a high-density crushing particle layer, so as to improve the rolling efficiency of the rolling roller.

[0021] The isolation sleeve is a folded cylinder structure connected by a plurality of annular folded corrugations, and can freely expand or contract with the movement of the telescopic driving member.

[0022] Further, the moving plate comprises a plate body, air outlet holes uniformly distributed on the bottom wall of the plate body, connecting holes arranged on the side wall of the plate body, a main air flow channel horizontally arranged in the plate body and in communication with the connecting holes, a shunt channel vertically extending from the main air flow channel to each air outlet hole, and an air inlet pipe in air-tight communication with the connecting holes.

[0023] The bottom wall of the moving plate is divided into a left side where the vertical plate is fixed and a right side where the rolling assembly is fixed by the limiting plate, and the air outlet holes are arranged on the left side of the moving plate.

[0024] Further, the air inlet unit comprises a compressed air pump mounted on the side wall of the box through a corresponding fixed base, a connecting pipeline for connecting the air outlet end of the compressed air pump with the air inlet pipe to generate a preset strength air flow in each air outlet hole, and a control unit for controlling the air flow output of the negative pressure air pump.

[0025] Further, the control unit controls the compressed air pump to output P(t) air flow speed according to the operation time of the linear hydraulic motor.

[0026]

[0027] wherein t is the duration of the linear hydraulic operation, P(t) is the air flow speed output by the compressed air pump corresponding to the duration t of the linear hydraulic operation, t is in seconds, Qmin is the minimum air flow speed output by the compressed air pump, which is not limited, Qmin is in square meters per second, A is the air flow intensity variation range, A∈[0.5×Qmin, 2×Qmin], u is the periodic adjustment factor, u is in seconds, u∈[1 second, 10 seconds], and Qmin is greater than 0 to avoid the air outlet holes being blocked by dust particles.

[0028] The present application has the following advantages:

[0029] 1. The application adopts efficient screening and rolling design, improves the uniformity and dissolution efficiency of the crushed particles through wave airflow output, ultrasonic vibration and dynamic limiting plate adjustment, ensures the high purity and stability of sodium silicate products, effectively solves the problem of difficult efficient utilization of iron tailings sand, and effectively improves the utilization of solid waste resources and green production.

[0030] 2. The processing system of the application realizes accurate optimization of the particle size of the crushed particles through dynamic adjustment and intelligent control, significantly improves the uniformity and dissolution efficiency of the crushed particles, thereby greatly improving the preparation efficiency of sodium silicate, and the processing system of the application adopts efficient crushing and screening design, reduces manual intervention, improves the automation degree and stability of equipment operation, and has wide applicability, providing efficient technical support for the industrial value improvement of iron tailings sand resource preparation of sodium silicate.

[0031] 3. In the process of rolling and screening, the application combines wave airflow, ultrasonic vibration and dynamic rolling components to improve the processing efficiency of the crushed particles, the high-strength material and precision machining of the filter plate ensure the durability and accuracy of the equipment, and the intelligent adjustment and dynamic adaptation of the overall system provide a stable, efficient and energy-saving solution for efficient screening and preparation of sodium silicate from iron tailings sand in industry.

[0032] 4. The application improves the utilization rate of the dissolved liquid and significantly improves the reaction efficiency and product purity of sodium silicate preparation by precise separation of the filtrate and the filtrate, and significantly improves the utilization efficiency of iron tailings sand resources and the reaction efficiency of sodium silicate preparation, solves the problem of difficult efficient utilization of iron tailings sand, and provides an environmentally friendly, efficient and economical technical solution for sodium silicate production. BRIEF DESCRIPTION OF DRAWINGS

[0033] The application can be further understood from the following description in conjunction with the accompanying drawings. The components in the drawings are not necessarily drawn to scale, but emphasis is placed on showing the principles of the embodiments. In different views, the same reference numerals designate corresponding parts.

[0034] Figure 1 is a partial structure schematic diagram of the processing system for preparing sodium silicate from iron tailings sand of the application.

[0035] Figure 2 is a partial structure schematic diagram of the primary screening module of the application.

[0036] Figure 3 is a structure schematic diagram of one of the rolling components of the application.

[0037] Figure 4 is another structure schematic diagram of the rolling component of the application.

[0038] Figure 5 Structure diagram of the moving plate of the application.

[0039] Figure 6 Structure diagram of the filter cartridge of the application.

[0040] Figure 7 Experimental simulation diagram of the air flow speed output by the compression air pump of the application.

[0041] Brief description of the drawings: 1-box; 2-fixed frame; 3-buffer spring column; 4-stirrer; 5-reaction tank; 6-drainage pipe; 7-retention pipe; 8-liquid inlet pipe; 9-filter cartridge; 10-moving plate; 11-bearing seat; 12-rolling stick; 13-filter plate; 14-hopper; 15-linear hydraulic motor; 16-vertical plate; 17-telescopic driving part; 18-base plate; 19-limiting plate; 20-insulating sleeve; 21-air inlet pipe; 22-plate body; 23-air outlet hole; 24-shunt channel; 25-main air flow channel; 26-cylinder; 27-inclined intercepting piece; 28-circular arc intercepting piece. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the application more clear and understandable, the application will be further described in detail below in combination with the embodiments thereof; it is pointed out that the specific embodiments described herein are only used to explain the application and are not used to limit the case. For those skilled in the art, other systems, methods and / or features of the embodiments will become apparent after reading the following detailed description. And the terms used to describe the positional relationship in the drawings are only used for illustrative description, and cannot be understood as a limitation of the patent. For those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0043] Embodiment one: in combination with the attached Figure 1 , attached Figure 2 , attached Figure 3 , attached Figure 4 , attached Figure 5 , attached Figure 6 and attached Figure 7 , the embodiment constructs a processing system for preparing sodium silicate by using iron tailings, wherein the preparation steps for preparing sodium silicate by using iron tailings include:

[0044] Step one: after mixing the iron tailings and sodium hydroxide uniformly, send them to the horse-shoe flame kiln, and carry out the melting reaction at 700-850 degrees Celsius;

[0045] Step two: after the melting of the iron tailings and sodium hydroxide, the generated molten material stays in the furnace for 30-40 minutes to obtain the solid sodium silicate crude product, and the solid sodium silicate crude product is crushed into crushed particles by the crusher;

[0046] Step three: the crushed particles are added into pure water and slowly heated to 60-80 degrees Celsius for dissolution, obtaining a dissolution solution, filtering out the filtrate in the dissolution solution, and taking the filtrate of the dissolution solution as liquid sodium silicate;

[0047] Step four: a mixed acid solution is added dropwise into the liquid sodium silicate to produce snowflake-like silicic acid precipitate, obtaining a mixed solution, wherein the mixed acid is selected from any one or a combination of two or more of sulfuric acid, hydrochloric acid and nitric acid;

[0048] Step five: the silicic acid precipitate in the mixed solution is washed twice by pure water and then filtered to obtain a white filter cake crude product;

[0049] Step six: the white filter cake is dehydrated at a temperature below 60 degrees Celsius to obtain an ultra-pure silicon dioxide solid powder.

[0050] The processing system for preparing sodium silicate from iron tailings sand comprises an initial screening module for receiving the crushed particles and performing screening and rolling pressure treatment on the crushed particles, a reaction tank for receiving the crushed particles treated by the initial screening module, a stirrer for performing stirring treatment in the reaction tank, a first quantitative liquid feeder for quantitatively adding pure water into the reaction tank, a heater for performing heating treatment on the reaction tank, a circulating flow module for discharging the filtrate in the reaction tank to the outside of the reaction tank while retaining the filtrate in the reaction tank, a liquid discharge pipe for discharging the liquid sodium silicate in the reaction tank to the outside of the reaction tank, and a discharge valve for controlling the communication between the liquid discharge pipe and the reaction tank.

[0051] The processing system performs screening and rolling pressure treatment on the crushed particles by the initial screening module, and the treated crushed particles enter the reaction tank. Meanwhile, the first quantitative liquid feeder accurately controls the injection of pure water into the reaction tank. The heater raises the temperature in the reaction tank to 60-80 degrees Celsius. Under the uniform stirring action of the stirrer, the crushed particles are dissolved in the dissolution tank to obtain a dissolution solution.

[0052] The heater is a heating device of the prior art, which will not be described again. The initial screening module comprises a box body with a communication opening at the upper and lower ends, a funnel piece provided in communication with the top of the box body and the lower end of the box body and provided in communication with the bottom of the reaction tank, a fixed frame sleeved on the outer wall of the box body, a buffer spring column fixedly connected to the top end of the fixed frame and fixedly connected to the top wall of the tank of the reaction tank at the bottom end, a filter plate horizontally arranged in the box body, a moving plate horizontally penetrating through one of the side walls of the box body and internally provided with an airflow channel, a rolling pressure assembly fixedly arranged with the moving plate for repeatedly rolling the crushed particles on the filter plate, a plurality of ultrasonic generators respectively arranged on the outer wall of the box body, a moving drive unit for driving the moving plate to move horizontally back and forth, and an air inlet unit for air flow conveying of the airflow channel in the moving plate.

[0053] The box side wall of the box is provided with a through hole, the through hole is provided with the moving plate horizontally, and the inner hole wall of the through hole is uniformly embedded with a plurality of rolling balls, and the rolling balls reduce the resistance of the moving plate during horizontal movement.

[0054] The moving drive unit comprises a vertical plate located outside the box and vertically fixed to the plate bottom wall of the moving plate, a linear hydraulic motor fixed to the box side wall through a corresponding mounting seat and horizontally telescopic, and a locking piece for fixedly connecting the driving end of the linear hydraulic motor with the vertical plate, and the linear hydraulic motor drives the moving plate to move horizontally and stably in the through hole through telescopic action.

[0055] The rolling assembly comprises a base plate located inside the box and horizontally laid on the plate bottom wall of the moving plate, at least two rolling rods which are respectively fixed to the bottom of the base plate through corresponding bearing seats and can be axially rotated, a limiting plate vertically arranged below the base plate, a telescopic drive member fixedly connected with the base plate at the top end and fixedly connected with the limiting plate at the bottom end, and an isolation sleeve sleeved on the outer wall of the telescopic drive member, and the initial posture of the rolling assembly is that the limiting plate is attached to the box side wall provided with the through hole.

[0056] The limiting plate mainly intercepts the crushed particles which are not crushed to the preset particle size and accumulates them in the rolling area between the rolling rods and the box, forming a high-density crushed particle layer to improve the rolling efficiency of the rolling rods, and in the operation process of the rolling assembly, the limiting plate can control the dynamic interception of the crushed particles of different particle sizes through the extension drive of the telescopic drive member, thereby improving the rolling efficiency of the rolling assembly on the crushed particles.

[0057] The isolation sleeve is a folded cylinder structure connected by a plurality of annular folded corrugations, and the isolation sleeve can freely expand or contract with the movement of the telescopic drive member, and the isolation sleeve is made of silica gel coated fiber cloth, has dustproof and tear-resistant properties, is suitable for complex dust and particle working environments, the flexible structure of the isolation sleeve can effectively isolate the erosion of particles, dust and liquid to the telescopic drive member, prolong the service life of the telescopic drive member, and ensure the smoothness of the movement of the telescopic drive member, and the rolling rods are arranged in parallel.

[0058] The processing system of the present application realizes the accurate optimization of the particle size of the crushed particles through dynamic adjustment and intelligent control, significantly improves the uniformity and dissolution efficiency of the crushed particles, and greatly improves the preparation efficiency of sodium silicate, the processing system of the present application adopts efficient crushing and screening design, reduces manual intervention, improves the automation degree and stability of equipment operation, and has wide applicability, and provides efficient technical support for improving the industrial value of the preparation of sodium silicate from iron tailings.

[0059] Example two: combined with Figure 1 , appendixFigure 2 , the accompanying Figure 3 , the accompanying Figure 4 , the accompanying Figure 5 , the accompanying Figure 6 and the accompanying Figure 7 , in addition to containing the contents of the above embodiments, further lies in that the moving plate comprises a plate body, air outlet holes uniformly distributed on the bottom wall of the plate body, a connecting hole provided on the side wall of the plate body, a main airflow channel horizontally arranged in the plate body and in communication with the connecting hole, a shunt channel vertically extending from the main airflow channel to each air outlet hole in sequence, and an air inlet pipe in airtight communication with the connecting hole.

[0060] Wherein, the bottom wall of the moving plate is divided into a left side fixed with a vertical plate and a right side fixed with a rolling assembly by the limiting plate as a boundary, the air outlet holes are correspondingly arranged in the area of the left side of the moving plate, and the air inlet unit comprises a compressed air pump mounted on the side wall of the box through a corresponding fixed base, a connecting pipeline for connecting the air outlet end of the compressed air pump with the air inlet pipe so as to make each air outlet hole generate airflow of a preset intensity, and a control unit for controlling the compressed air pump to output airflow.

[0061] The control unit controls the compressed air pump to output airflow at a speed of P(t) corresponding to the operation time of the linear hydraulic motor:

[0062]

[0063] Wherein, t is the duration of the linear hydraulic operation, P(t) is the airflow speed output by the compressed air pump corresponding to the duration t of the linear hydraulic operation, and t is in seconds, Qmin is the minimum airflow speed output by the compressed air pump, Qmin is in square meters per second, A is the airflow intensity variation range, and A ∈ [0.5 × Qmin, 2 × Qmin], u is a periodic adjustment factor, u is in seconds, u ∈ [1 second, 10 seconds], and in order to avoid the air outlet holes being blocked by dust particles, Qmin is greater than 0, and the specific value of Qmin is determined by a person skilled in the art based on actual needs and actual operation conditions of the compressed air pump, which is not limited here.

[0064] The control unit makes the rolling assembly generate airflow fluctuation of wavy intensity with 2u as a period during operation, and the control unit is used to control the compressed air pump to generate airflow of wavy intensity, drive the crushed particles on the sieve plate to move through periodic change, reduce the screening blind area, and make the rolling and screening processes of the rolling assembly more efficient.

[0065] The operation steps of the primary screening module for crushing and crushing the crushed particles are:

[0066] S101: The crushed particles enter the box of the primary screening module;

[0067] S102: The outer wall of the box is provided with a plurality of ultrasonic generators. Through the vibration signals of the ultrasonic generators and the support of the buffer spring column, the dispersion and screening of the crushed particles in the box are promoted;

[0068] S103: The linear hydraulic motor in the moving drive unit drives the rolling assembly to move horizontally and reciprocally from the initial posture. The rolling stick can rotate freely under the support of the bearing seat. When the moving plate moves reciprocally, the rolling stick repeatedly rolls the crushed particles on the filter plate to crush larger crushed particles.

[0069] S104: The air outlet outputs the wave-shaped air flow P(t) controlled by the compression air pump, further disperses the particles, prevents the crushed particles in the filter plate from accumulating and blocking, and further promotes the dispersion and screening of the crushed particles in the box.

[0070] s105: The crushed particles passing through the sieve plate enter the reaction tank.

[0071] The cross-sectional area of the funnel from top to bottom is arranged in turn in a decreasing manner, the filter plate is made of wear-resistant alloy steel, the thickness of the filter plate is more than 10mm, has excellent wear resistance and strength, the filter holes on the filter plate are uniformly distributed, the spacing between the filter holes is 2mm, the filter holes are processed by laser cutting technology, ensure that the hole diameter is accurate and the hole edge is smooth without burr, the surface of the filter plate is quenched to improve the wear resistance and impact resistance, the hardness of the filter plate reaches HRC50, can effectively resist the rolling and wear of iron tailing particles.

[0072] In the rolling and screening process, the wave-shaped air flow, ultrasonic vibration and dynamic rolling assembly are combined to improve the processing efficiency of the crushed particles, the high-strength material and precision machining of the filter plate ensure the durability and accuracy of the equipment, the intelligent adjustment and dynamic adaptation of the overall system provide a stable, efficient and energy-saving solution for the efficient screening and preparation of sodium silicate from industrial iron tailings.

[0073] Example three: combined with Figure 1 , appendix Figure 2 , appendix Figure 3 , appendix Figure 4 , appendix Figure 5 , appendix Figure 6 and appendix Figure 7 , in addition to containing the contents of the above examples, the circulating flow module comprises a circulating pipe, a driving liquid pump, a filter cartridge and a liquid inlet pipe, the filter cartridge comprises a cartridge body and an intercepting net horizontally arranged in the cartridge body, and the filter cartridge is arranged adjacent to the reaction tank.

[0074] One end of the circulating pipe is in communication with the bottom of the reaction tank, and the other end extends above the filter cartridge, and the circulating pipe is used for guiding the dissolved liquid in the reaction tank to the filter cartridge.

[0075] The driving liquid pump is used for driving the dissolved liquid in the reaction tank to flow to the filter cartridge from the circulating pipe, one end of the liquid inlet pipe is arranged in communication with the bottom of the filter cartridge, and the other end of the liquid inlet pipe is arranged in communication with the side wall of the reaction tank, and the other end of the liquid inlet pipe is higher than the height position of the upper limit of the liquid level of the reaction tank.

[0076] The interception net is provided with interception holes for intercepting the filtered material, and the filtrate in the dissolved liquid further flows back to the reaction tank through the liquid inlet pipe after passing through the filter cartridge, and the filtered material in the mixed liquid is intercepted in the filter cartridge.

[0077] The interception net comprises a circular-arc interception piece in a circular-arc structure and two inclined interception pieces symmetrically fixed at two ends of the circular-arc interception piece, the middle part of the circular-arc interception piece is arranged to be relatively upward protruding, and the circular-arc interception piece extends downward.

[0078] The end of the inclined interception piece located on the lower side is used for being connected and fixed with the circular-arc interception piece, and the end of the inclined interception piece located on the upper side is connected and fixed with the inner wall of the reaction tank.

[0079] The arc design of the circular-arc interception piece and the inclination angle of the inclined interception piece make the intercepted particles be uniformly distributed to both sides of the cylinder body, avoid the material accumulation in a single area of the interception net, the upward protruding design of the middle part of the circular-arc interception piece provides a preferential channel for the filtrate, which is helpful for the rapid discharge of the filtrate, reduces the residence time of the filtrate, and improves the filtration speed of the filtrate.

[0080] The circular-arc interception piece disperses the impact force from the particles, avoids the single-point stress damage of the circular-arc interception piece, and the inclined interception piece further transmits part of the particle load to the inner wall of the cylinder body, further enhances the stability of the overall structure of the interception net.

[0081] The present application improves the utilization rate of the dissolved liquid, and significantly improves the reaction efficiency of sodium silicate preparation and the product purity, significantly improves the utilization efficiency of iron tailings sand resources and the reaction efficiency of sodium silicate preparation, solves the problem that the iron tailings sand is difficult to be effectively utilized, and provides an environmental protection, high efficiency and economic technical scheme for sodium silicate production.

[0082] While the application has been described with reference to various embodiments, it will be understood that many modifications and variations of the present application are possible. It is therefore understood that within the scope of the application, that the application can be practiced otherwise than as specifically described. That is, the methods, systems and devices discussed above are examples. Various configurations can omit, substitute, or add various procedures or components as appropriate. For instance, the methods described can be performed in an order different from that described, and / or various steps can be added, omitted or combined. Also, features described with respect to certain configurations can be combined in other configurations, for example, features described with respect to one configuration can be combined with features described with respect to a different configuration. Also, control and signal lines can be conveyed by a variety of means known in the art and the example embodiment, such as a bus, a signal path, a wired connection, wireless connection, etc. Additionally, a plurality of different creative synthesis mechanisms can be employed. Also, the word "comprising" does not exclude the presence of elements or steps other than those listed and the word "a" or "an" preceding the name of an element does not exclude the presence of a plurality of such elements or steps. It is further understood that devices of the present application can optionally include one or more elements, features or steps described herein.

Claims

1. A processing system for preparing sodium silicate from iron tailings, the preparation steps for preparing sodium silicate from iron tailings comprising: Step 1: uniformly mixing iron tailings and sodium hydroxide and then sending the mixture to a horse-shoe flame kiln for melting reaction at 700-850 degrees Celsius, Step 2: after the melting of the iron tailings and sodium hydroxide, the generated molten material is retained in the furnace for 30-40 minutes to obtain solid sodium silicate crude product, and the solid sodium silicate crude product is crushed into crushed particles by a crusher, Step 3: adding pure water to the crushed particles and slowly heating to 60-80 degrees Celsius for dissolution to obtain a dissolution solution, filtering out the filtrate in the dissolution solution, and taking the filtrate of the dissolution solution as liquid sodium silicate, Step 4: adding a mixed acid solution to the liquid sodium silicate to produce snowflake-like silicic acid precipitate to obtain a mixed solution, wherein the mixed acid is selected from any one or a combination of two or more of sulfuric acid, hydrochloric acid and nitric acid, Step 5: washing the silicic acid precipitate of the mixed solution with pure water for 2 times and then filtering to obtain a white filter cake crude product, Step 6: dehydrating the white filter cake at a temperature below 60 degrees Celsius to obtain an ultra-pure silicon dioxide solid powder; characterized in that the processing system for preparing sodium silicate from iron tailings comprises: an initial screening module for receiving the crushed particles and performing screening and rolling treatment on the crushed particles, a reaction tank for receiving the crushed particles treated by the initial screening module, a stirrer for performing stirring treatment in the reaction tank, a first quantitative liquid feeder for quantitatively adding pure water into the reaction tank, a heater for performing heating treatment on the reaction tank, a circulating flow module for discharging the filtrate in the reaction tank to the outside of the reaction tank while retaining the filtrate in the reaction tank, a liquid discharge pipe for discharging the liquid sodium silicate in the reaction tank to the outside of the reaction tank, and a discharge valve for controlling the communication between the liquid discharge pipe and the reaction tank; the initial screening module comprises a box body with a communication opening at the top and bottom ends, a hopper piece provided in communication with the top of the box body and the bottom of the reaction tank, a fixed frame sleeved on the outer wall of the box body, a buffer spring column fixedly connected with the fixed frame at the top end and fixedly connected with the top wall of the reaction tank at the bottom end, a filter plate horizontally provided in the box body, a moving plate horizontally penetrating through one of the side walls of the box body and provided with an airflow channel inside, a rolling assembly fixedly provided with the moving plate for repeatedly rolling the crushed particles on the filter plate, a plurality of ultrasonic generators respectively arranged on the outer wall of the box body, a moving drive unit for driving the moving plate to move horizontally back and forth, and an air inlet unit for air flow conveying of the airflow channel in the moving plate; the moving plate comprises a plate body, air outlet holes uniformly distributed on the bottom wall of the plate body, a connecting hole provided on the side wall of the plate body, a main airflow channel horizontally provided inside the plate body and in communication with the connecting hole, a branch flow channel vertically extending from the main airflow channel to each air outlet hole in sequence, and an air inlet pipe in airtight communication with the connecting hole. The air inlet unit comprises a compressed air pump mounted on the side wall of the box through a corresponding fixed base, a connecting pipeline for connecting the air outlet end of the compressed air pump with the air inlet pipe to generate a preset strength airflow at each air outlet hole, and a control unit for controlling the compressed air pump to output airflow, The control unit controls the compressed air pump to output the P(t) air flow rate according to the operation time of the linear hydraulic motor: Wherein, t is the continuous working time of the linear hydraulic motor, P(t) is the airflow speed output by the compressed air pump corresponding to the continuous working time t of the linear hydraulic motor, the unit of t is second, Qmin is the minimum airflow speed output by the compressed air pump, which is not limited here, the unit of Qmin is square meter per second, A is the airflow intensity variation range, and A∈[0.5× Qmin, 2×Qmin], u is a periodic adjustment factor, the unit of u is second, u∈[1 second, 10 seconds], and Qmin is greater than 0 to avoid the air outlet hole being blocked by dust particles.

2. The processing system of claim 1, wherein, A through hole is arranged on the side wall of the box, the moving plate is horizontally arranged through the through hole, and the inner wall of the through hole is uniformly embedded with rolling balls to reduce the resistance of the moving plate during horizontal movement.

3. The processing system of claim 2, wherein, The moving drive unit comprises a vertical plate located outside the box and vertically fixed to the bottom wall of the moving plate, a linear hydraulic motor fixed to the side wall of the box through a corresponding mounting seat and horizontally telescopic moving, and a locking piece for fixedly connecting the driving end of the linear hydraulic motor with the vertical plate, and the linear hydraulic motor drives the moving plate to stably and horizontally reciprocate in the through hole through telescopic action.

4. The processing system of claim 3, wherein The rolling assembly comprises a base plate located in the box and horizontally laid on the bottom wall of the moving plate, at least two rolling rods rotatably fixed to the bottom of the base plate through corresponding bearing seats, a limiting plate vertically arranged below the base plate, a telescopic drive member fixedly connected with the base plate at the top end and fixedly connected with the limiting plate at the bottom end, and an isolation sleeve sleeved on the outer wall of the telescopic drive member, and the initial posture of the rolling assembly is that the limiting plate is attached to the side wall of the box provided with the through hole. The limiting plate mainly intercepts the crushed particles that are not crushed to the preset particle size and accumulates them in the rolling area between the rolling rod and the box to form a high-density crushed particle layer, thereby improving the rolling efficiency of the rolling rod, and during the operation of the rolling assembly, the limiting plate can dynamically intercept the crushed particles of different particle sizes through the extension drive of the telescopic drive member, thereby improving the rolling efficiency of the rolling assembly on the crushed particles. The isolation sleeve is a folded cylinder structure connected by a plurality of annular bellows, and the isolation sleeve can freely expand or contract with the movement of the telescopic drive member, and the isolation sleeve is made of silica gel coated fiber cloth, which has dustproof and tear-resistant properties.

5. The processing system of claim 4, wherein, The bottom wall of the moving plate is divided into a left side where the vertical plate is fixed and a right side where the rolling assembly is fixed by taking the limiting plate as a boundary, and the air outlet holes are arranged in the area of the left side of the moving plate.

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