Method and device for fixing lead with modified sisal fiber reinforced filling body by physical and chemical combination

Abstract

The application discloses a method and device for fixing lead by using a physical-chemical combined modified sisal fiber reinforced filling body, and belongs to the technical field of tailings treatment. The method comprises the following steps: S1, physical pretreatment of sisal fiber; S2, alkali immersion pretreatment of sisal fiber; S3, modification pretreatment of sisal fiber; S4, preparation of high-concentration full tailings slurry from low-concentration full tailings slurry; and S5, mixing and stirring of the modified sisal fiber obtained in the step S3, high-concentration full tailings slurry, Portland cement and industrial water to form a homogeneous filling material slurry. Through the physical and chemical combined pretreatment of the sisal fiber, the mechanical properties of the filling body and the lead fixing capacity are improved under the condition of low cement consumption, the addition of the sisal fiber to the filling material slurry prevents the migration of heavy metal lead in the underground and causes influence on the environment, and the problem of tailings storage is reduced to a certain extent.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tailings treatment, and particularly relates to a method and device for modifying and fixing lead of a filling body reinforced by physical and chemical combined modified sisal fibers. BACKGROUND

[0002] The storage of tailings is a worldwide problem, which not only occupies a large amount of land, but also has the risk of dam collapse. The most important point is that the surface of the tailings contains a large amount of active heavy metal ions, which, after a long time of large storage and rainwater erosion, will flow to the surrounding farmland or underground water source, thereby causing heavy metal pollution and great harm to people and the environment. Therefore, the treatment of tailings should meet the requirements of economy saving and environmental safety. Under this background, the present application proposes a method for modifying and fixing lead of a filling body reinforced by physical and chemical combined modified sisal fibers.

[0003] Sisal fiber is a natural plant bast fiber and a renewable resource, which is low in price and widely available. It is used in the underground filling system to meet the development concept of energy saving and environmental protection. At present, sisal fiber has been widely used in the composite material of reinforced concrete. Modified sisal fiber can also be used in sewage treatment, but it is rarely used in the field of underground filling and heavy metal fixation. SUMMARY

[0004] The present application aims to solve the problems in the prior art and provides a method and device for modifying and fixing lead of a filling body reinforced by physical and chemical combined modified sisal fibers.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0006] A method for modifying and fixing lead of a filling body reinforced by physical and chemical combined modified sisal fibers, comprising the following steps:

[0007] S1, physical pretreatment of sisal fiber: the fiber is placed in a stirring barrel to clean the surface impurities, and then high-temperature drying treatment is carried out at 120 DEG C. After that, the fiber is crushed into small pieces of about 2 cm for standby use;

[0008] S2, alkali immersion pretreatment of sisal fiber: the crushed sisal fiber is placed in a stirring barrel containing 15% NaOH solution and soaked for 3-4 hours to dissolve hemicellulose and lignin in the sisal fiber and destroy the molecular structure of cellulose. Stirring is required during soaking to fully destroy the lignin and hemicellulose in the fiber. The stirring speed is 30 r / min. After alkali immersion, the fiber is cleaned with clean water;

[0009] S3, modification pretreatment of sisal fiber: the alkali immersed sisal fiber is placed in a stirring barrel containing 10% silane coupling agent solution and soaked for 24 hours. The purpose is to improve the compatibility between the fiber and the matrix and improve the interface bonding strength. ​Carboxyl groups in the solution are grafted on the broken cellulose molecules to enhance the fixing ability of heavy metal lead; in order to enable as many carboxyl functional groups as possible to be grafted on the cellulose molecules, uniform stirring at 30 r / min is carried out during the soaking process, so as to prepare the modified sisal fibers;

[0010] S4, the full tailings slurry with a mass concentration of 10% to 15% from the lead-zinc mine dressing plant is pumped to a deep cone thickener or a vertical sand bin thickening device by a slurry pump to form high-concentration full tailings slurry with a concentration of 73% to 75%;

[0011] S5, the modified sisal fibers obtained in step S3 are transported to a mixing barrel by a belt conveyor as an additive; the high-concentration full tailings slurry in step S4 is pumped to the mixing barrel by a slurry pump as a filling aggregate; the PO425 Portland cement in the cement bin is transported to the mixing barrel by a screw conveyor; the industrial water in the water bin is transported to the mixing barrel by a clean water pump; after uniform stirring in the mixing barrel for 10 to 20 min, the homogeneous filling material slurry with a concentration of 61% to 65% is formed;

[0012] S6, the homogeneous filling material slurry is transported to the underground goaf by pumping or self-flowing pipe transportation;

[0013] S7, after curing for 7d, 14d and 28d underground, the in-situ filling body is drilled and cored, processed into a standard sample, and then tested for uniaxial compressive strength according to the standard GB / T51450-2022; then the in-situ filling body is tested for toxicity leaching according to the standard HJ557-2010.

[0014] Preferably, in the step S5, the number of parts of the full tailings in the homogeneous filling material slurry concentration is 60, the number of parts of the cement is 10, and the number of parts of the modified sisal fibers is 1 to 2.

[0015] Preferably, the main chemical components of the lead-zinc mine full tailings in step S4 are Al203, SiO2 and FeS2; the particle size distribution is D03=1.474μm, D06=2.521μm, D30=9.570μm, D70=74.53μm and D97=253.4μm.

[0016] A device for fixing lead by a physicochemical combined modified sisal fiber reinforced filling body, comprising a stirring barrel in a method for fixing lead by a physicochemical combined modified sisal fiber reinforced filling body, the stirring barrels in steps S1, S2 and S3 are the same in structure, each comprising a barrel body, a rotating pipe rotatably connected in the barrel body, a plurality of stirring blades fixed at the bottom of the rotating pipe, a rotating rod rotatably connected in the barrel body, and a stirring motor fixed at the bottom of the barrel body and used for driving the rotating rod to rotate.

[0017] Preferably, a connecting pipe connected with the rotating pipe is fixedly arranged in the barrel, a lifting plate is slidably connected between the connecting pipe and the rotating rod, a feeding shell is fixedly arranged on the top of the connecting pipe, a lifting assembly for lifting the lifting plate is arranged on the feeding shell, a discharging shell is communicated with the top of the feeding shell, a pushing assembly for pushing the discharging shell to drop the material in the feeding shell is arranged in the feeding shell, and the lifting assembly is connected with the pushing assembly.

[0018] Preferably, the lifting assembly comprises a support fixedly arranged on the feeding shell, a first rotating rod and a second rotating rod are rotatably connected on the support, a first gear is arranged on the first rotating rod, a second gear meshing with the first gear is arranged on the second rotating rod, a second winding drum is arranged on the second rotating rod, a second pulling rope is wound and connected on the second winding drum, one end of the second pulling rope away from the second winding drum penetrates through the feeding shell and the connecting pipe and is fixedly connected with the lifting plate, the feeding shell is further fixedly arranged with a winding motor for driving the first rotating rod to rotate through a supporting plate, a first winding drum is arranged on the first rotating rod, a first pulling rope is wound and connected on the first winding drum, and one end of the first pulling rope away from the first winding drum penetrates through the feeding shell and is connected with the pushing assembly.

[0019] Preferably, the outer ring teeth of the first gear are provided with a vacancy, and the first gear is intermittently meshed with the second gear.

[0020] Preferably, the pushing assembly comprises a sliding plate slidably connected in the feeding shell and connected with the first pulling rope, a first elastic element is arranged between the sliding plate and the inner wall of the feeding shell, a second elastic element is fixedly arranged on the side of the sliding plate away from the first elastic element, a pushing seat is connected at one end of the second elastic element away from the sliding plate, the pushing seat is slidably connected in the feeding shell, a recess hole communicating with the connecting pipe is arranged on the pushing seat, and a baffle for shielding the opening at the bottom of the discharging shell is fixedly arranged on the pushing seat.

[0021] Preferably, a first pneumatic elastic telescopic pipe is arranged on the connecting pipe and movably abuts against the lifting plate, a second pneumatic elastic telescopic pipe is fixedly arranged at the bottom of the feeding shell, a gas pipe is communicated between the first pneumatic elastic telescopic pipe and the second pneumatic elastic telescopic pipe, and two positioning grooves are arranged on the baffle and inserted with the second pneumatic elastic telescopic pipe.

[0022] Preferably, the first and second pneumatic elastic telescopic pipes have the same structure, each comprising a sleeve, a piston slidingly connected in the sleeve, a third elastic element arranged between the piston and the inner wall of the sleeve, and a movable rod fixed on the piston, the end of the movable rod of the first pneumatic elastic telescopic pipe is provided with a circular arc surface, the circular arc surface is in movable abutment with the lifting plate, the movable rod of the second pneumatic elastic telescopic pipe comprises an elastic telescopic rod fixed with the piston and a positioning rod body fixed with the elastic telescopic rod, the positioning rod body is movably inserted into the positioning groove and in movable abutment with the sliding plate, the first and second inclined surfaces are respectively arranged on the two sides of the positioning rod body, and the cross-sectional length of the first inclined surface is greater than that of the second inclined surface.

[0023] Compared with the prior art, the present application provides a method and device for fixing lead in a modified sisal fiber reinforced filling body by physical and chemical combination, which has the following beneficial effects:

[0024] 1. The method and device for fixing lead in a modified sisal fiber reinforced filling body by physical and chemical combination, after physical and chemical treatment of natural sisal fibers, the porosity of the sisal fiber surface is increased, the cellulose molecules are destroyed, and functional groups such as carboxyl groups are grafted, thereby increasing the fixation sites for heavy metal lead; after adding the modified sisal fiber to the filling slurry and transporting it to the underground filling, the mechanical strength of the filling body can be improved, and the heavy metal lead in the slurry can be fixed to prevent migration of the heavy metal lead in the underground environment, thereby reducing the problem of tailings storage to a certain extent.

[0025] 2. The method and device for fixing lead in a modified sisal fiber reinforced filling body by physical and chemical combination, by simultaneously removing the sisal fiber material in the stirring cylinder and automatically feeding the modified sisal fiber material, the automation of material feeding and discharging is improved, the operation time is shortened, and the sisal fiber modification processing efficiency is improved.

[0026] 3. The method and device for fixing lead in a modified sisal fiber reinforced filling body by physical and chemical combination, when the lifting plate pushes the sisal fiber material in the cylinder, the intermittent meshing of the first and second gears causes the lifting plate to intermittently shake down during upward movement, which accelerates the dehydration effect of the sisal fiber material removed from the cylinder, facilitates subsequent rapid drying treatment, and further improves the sisal fiber modification processing efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The step flow chart of the present application;

[0028] Figure 2 The external structure diagram of the stirring cylinder of the present application;

[0029] Figure 3 The external structure diagram of the stirring cylinder of the present application; Figure 2 The partial enlarged structure diagram of A part in the present application;

[0030] Figure 4 A sectional view of the stirring barrel of the present application is shown in the figure.

[0031] Figure 5 A sectional view of the stirring barrel of the present application is shown in the figure. Figure 4 A sectional view of the stirring barrel of the present application is shown in the figure.

[0032] Figure 6 A sectional view of the stirring barrel of the present application is shown in the figure.

[0033] Figure 7 A sectional view of the stirring barrel of the present application is shown in the figure.

[0034] In the figure: 1, stirring barrel; 101, barrel body; 102, rotating tube; 103, stirring blade; 104, rotating rod; 105, stirring motor; 2, connecting tube; 3, lifting plate; 4, material conveying shell; 5, material discharging shell; 6, support; 601, first rotating rod; 6011, first gear; 6012, first winding drum; 6013, first pull rope; 602, second rotating rod; 6021, second gear; 6022, second winding drum; 6023, second pull rope; 603, winding motor; 7, empty part; 8, sliding plate; 801, first elastic element; 802, second elastic element; 803, pushing seat; 8031, recess; 8032, baffle; 9, first pneumatic elastic telescopic tube; 901, sleeve; 902, piston; 903, third elastic element; 904, movable rod; 9041, elastic telescopic rod; 9042, positioning rod body; 9043, first inclined surface; 9044, second inclined surface; 10, second pneumatic elastic telescopic tube; 11, positioning groove. DETAILED DESCRIPTION

[0035] 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 some of the embodiments of the present application, but not all the embodiments of the present application.

[0036] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0037] Embodiment 1: Refer to Figures 1-7 A method for fixing lead by using the modified sisal fiber reinforced filling body, comprising the following steps:

[0038] S1. Physical pretreatment of sisal fiber: The fiber is placed in a mixing drum 1 to wash away surface impurities, and then dried at a high temperature of 120°C. After that, the fiber is crushed into small pieces of about 2cm for later use.

[0039] S2. Alkali soaking pretreatment of sisal fiber: The crushed sisal fiber is soaked in a 15% NaOH solution in a stirring tank 1 for 3-4 hours to dissolve the hemicellulose and lignin in the sisal fiber and destroy the cellulose molecular structure. Stirring is required during soaking so that the lignin and hemicellulose in the fiber can be fully destroyed. The stirring speed is 30 r / min. After the alkali soaking is completed, rinse with clean water.

[0040] S3. Pretreatment of modified sisal fibers: Place the alkali-impregnated sisal fibers in a 10% solution. The solution was soaked in stirring tank 1 for 24 hours. The purpose of this was to... Carboxyl groups in the solution are grafted onto the damaged cellulose molecules to enhance the fixation ability of heavy metal lead; in order to graft as many carboxyl functional groups as possible onto the cellulose molecules, the mixture is stirred at a constant speed of 30 r / min during the soaking process to prepare modified sisal fibers; after soaking, the fibers are dried directly without washing.

[0041] S4. The tailings slurry with a mass concentration of 10% to 15% from the lead-zinc mine is pumped to a deep cone thickener or a vertical sand bin thickening device to form a high-concentration tailings slurry with a concentration of 73% to 75%.

[0042] S5. The modified sisal fiber obtained in step S3 is conveyed to the mixing tank via a belt conveyor as an additive; the high-concentration tailings mortar in step S4 is pumped to the mixing tank via a slurry pump as filling aggregate; the PO425 silicate cement in the cementitious material silo is conveyed to the mixing tank via a screw conveyor; the industrial water in the water silo is conveyed to the mixing tank via a clean water pump; after uniformly stirring in the mixing tank for 10-20 minutes, a homogeneous filling slurry with a concentration of 61%-65% is formed.

[0043] S6. The above-mentioned homogeneous filling slurry is pumped or piped to the underground goaf by gravity flow.

[0044] S7. After curing in the well for 7d, 14d, and 28d, core samples were taken from the in-situ filling material and processed into standard specimens. Three boreholes were drilled for each age, and three sets of filling material specimens were made from each borehole, for a total of nine sets of filling material specimens. The average value was taken as the compressive strength of the filling material at that age. The uniaxial compressive strength of the in-situ filling material was tested according to GB / T51450-2022 standard. Then, the toxicity leaching test of the in-situ filling material was conducted according to HJ557-2010 standard.

[0045] The application increases the porosity of the surface of natural sisal fibers, destroys the cellulose molecules, grafts functional groups such as carboxyl groups, and increases the fixation sites of heavy metal lead after physical treatment and chemical treatment; after the modified sisal fibers are added to the filling material slurry and transported to the underground filling, the mechanical strength of the filling body can be improved, the heavy metal lead in the slurry can be fixed, the migration of the heavy metal lead in the underground environment can be prevented, and the stacking problem of the tailings can be reduced to a certain extent.

[0046] As a preferred technical solution of the application, further, the number of portions of the full tailings in the homogeneous filling material slurry concentration in step S5 is 60, the number of portions of the ordinary portland cement is 10, and the number of portions of the modified sisal fiber is 1-2, and the mass concentration of the filling material slurry is 72%.

[0047] As a preferred technical solution of the application, further, the main chemical components of the lead-zinc mine full tailings in step S4 are Al2O3, SiO2, FeS2, etc.; and the particle size distribution is D03=1.474 μm, D06=2.521 μm, D30=9.570 μm, D70=74.53 μm, and D97=253.4 μm.

[0048] Embodiment 2: Refer to Figures 1-7 A device for fixing lead by the modified sisal fiber reinforced filling body in the physical and chemical combined modification, which comprises a stirring cylinder 1 in the method for fixing lead by the modified sisal fiber reinforced filling body in the physical and chemical combined modification, and the stirring cylinder 1 in steps S1, S2 and S3 is the same in structure and comprises a cylinder body 101, a rotating pipe 102 rotatably connected in the cylinder body 101, a plurality of stirring blades 103 fixed at the bottom of the rotating pipe 102, a rotating rod 104 rotatably connected in the cylinder body 101, and a stirring motor 105 fixed at the bottom of the cylinder body 101 and used for driving the rotating rod 104 to rotate; specifically, when the stirring cylinder 1 is stirring, the stirring motor 105 is controlled to operate, the output shaft of the stirring motor 105 drives the rotating rod 104 to rotate, the rotating rod 104 drives the stirring blades 103 to rotate through the rotating pipe 102, and the stirring blades 103 drive the materials in the cylinder body 101 to rotate and mix.

[0049] As a preferred technical solution of the application, further, a connecting pipe 2 is fixed in the cylinder body 101 and connected with the rotating pipe 102, a lifting plate 3 is slidably connected between the connecting pipe 2 and the rotating rod 104, a material conveying shell 4 is fixed at the top of the connecting pipe 2, a lifting assembly for lifting the lifting plate 3 is arranged on the material conveying shell 4, a discharging shell 5 is communicated with the top of the material conveying shell 4, a pushing assembly for pushing the materials in the discharging shell 5 to fall into the material conveying shell 4 is arranged in the material conveying shell 4, and the lifting assembly is connected with the pushing assembly.

[0050] Further, the pulling assembly comprises a support 6 fixed on the feeding shell 4, a first rotating rod 601 and a second rotating rod 602 are rotatably connected on the support 6, the first rotating rod 601 is provided with a first gear 6011, the second rotating rod 602 is provided with a second gear 6021 engaged with the first gear 6011, the second rotating rod 602 is provided with a second winding drum 6022, the second winding drum 6022 is wound and connected with a second pulling rope 6023, one end of the second pulling rope 6023 away from the second winding drum 6022 penetrates through the feeding shell 4 and the connecting pipe 2 and is fixedly connected with the lifting plate 3, the feeding shell 4 is further fixedly provided with a winding motor 603 for driving the first rotating rod 601 to rotate through a support plate, the first rotating rod 601 is provided with a first winding drum 6012, the first winding drum 6012 is wound and connected with a first pulling rope 6013, one end of the first pulling rope 6013 away from the first winding drum 6012 penetrates through the feeding shell 4 and is connected with the pushing assembly.

[0051] Further, the outer ring teeth of the first gear 6011 are provided with a vacancy 7, and the first gear 6011 is intermittently engaged with the second gear 6021.

[0052] Further, the pushing assembly comprises a sliding plate 8 slidably connected in the feeding shell 4 and connected with the first pulling rope 6013, a first elastic element 801 is arranged between the sliding plate 8 and the inner wall of the feeding shell 4, a second elastic element 802 is fixedly arranged on the side of the sliding plate 8 away from the first elastic element 801, one end of the second elastic element 802 away from the sliding plate 8 is connected with a pushing seat 803, the pushing seat 803 is slidably connected in the feeding shell 4, the pushing seat 803 is provided with a recess hole 8031 communicated with the connecting pipe 2, and the pushing seat 803 is fixedly provided with a baffle 8032 for shielding the opening at the bottom of the feeding shell 5.

[0053] Further, the connecting pipe 2 is provided with a first pneumatic elastic telescopic pipe 9 movably abutting against the lifting plate 3, the bottom of the feeding shell 4 is fixedly provided with a second pneumatic elastic telescopic pipe 10, the first pneumatic elastic telescopic pipe 9 and the second pneumatic elastic telescopic pipe 10 are communicated through an air pipe, and the baffle 8032 is provided with two positioning grooves 11 plugged with the second pneumatic elastic telescopic pipe 10.

[0054] Further, the first and second pneumatic elastic telescopic pipes 9 and 10 are of the same structure, each comprising a sleeve 901, a piston 902 slidingly connected in the sleeve 901, a third elastic element 903 arranged between the piston 902 and the inner wall of the sleeve 901, and a movable rod 904 fixed on the piston 902, the end of the movable rod 904 of the first pneumatic elastic telescopic pipe 9 is provided with a circular arc surface, the circular arc surface is in movable abutment with the lifting plate 3, the movable rod 904 of the second pneumatic elastic telescopic pipe 10 comprises an elastic telescopic rod 9041 fixedly connected with the piston 902 and a positioning rod body 9042 fixedly connected with the elastic telescopic rod 9041, the positioning rod body 9042 is movably inserted in the positioning groove 11 and is in movable abutment with the sliding plate 8, the first and second inclined surfaces 9043 and 9044 are respectively arranged on the two sides of the positioning rod body 9042, the cross-sectional length of the first inclined surface 9043 is greater than that of the second inclined surface 9044.

[0055] Specifically, after the sisal fiber in the stirring cylinder 1 is mixed and modified, the winding motor 603 is controlled to operate, the output shaft of the winding motor 603 drives the first rotating rod 601 to rotate, the first gear 6011 on the first rotating rod 601 meshes with the second gear 6021 on the second rotating rod 602 to drive the second rotating rod 602 to rotate, the first rotating rod 601 winds the first pull rope 6013 through the first winding drum 6012 when rotating, the sliding plate 8 is pulled by the first pull rope 6013, the sliding plate 8 moves horizontally in the material conveying shell 4, and the first elastic element 801 is stretched, at this time, the movable rod 904 of the second pneumatic elastic telescopic pipe 10 is inserted into the baffle 8032 to fix the pushing seat 803 in place, with the displacement of the sliding plate 8, the second elastic element 802 is stretched, the second rotating rod 602 winds the second pull rope 6023 through the second winding drum 6022 when rotating, the lifting plate 3 is pulled upward by the second pull rope 6023, so that the lifting plate 3 drives all the sisal fiber materials in the cylinder body 101 to move upward, avoiding incomplete discharge of the sisal fiber materials when the cylinder body 101 discharges, because the first gear 6011 is provided with the gap 7, the first gear 6011 and the second gear 6021 intermittently mesh, when the first gear 6011 does not mesh with the second gear 6021, the lifting plate 3 moves downward under the action of its own gravity, and then continues to move upward under the meshing between the gears, so that the lifting plate 3 drives the sisal fiber materials to shake during upward movement, speeds up the dehydration effect of the sisal fiber materials removed from the cylinder body 101, facilitates subsequent rapid drying treatment, and improves the sisal fiber modification processing efficiency;

[0056] With the continuous operation of the winding motor 603, the sliding plate 8 moves to the movable rod 904 of the second pneumatic elastic telescopic pipe 10, the sliding plate 8 abuts against the second slope 9044, the positioning rod body 9042 is forced to extrude the elastic telescopic rod 9041, the second slope 9044 of the positioning rod body 9042 enters the positioning groove 11, at this time the top surface of the lifting plate 3 is in the same aspect as the inner wall surface of the material conveying shell 4, the control winding motor 603 stops running, the sisal fiber material is placed between the top inner wall of the material conveying shell 4 and the lifting plate 3, the lifting plate 3 can cooperate with the inner wall of the material conveying shell 4 to extrude the excess moisture in the sisal fiber material, after the curved surface on one side of the second slope 9044 of the positioning rod body 9042 leaves the positioning groove 11, the inner wall of the positioning groove 11 can continue to apply force to the second slope 9044 of the positioning rod body 9042 under the push of the second elastic element 802, the positioning rod body 9042 avoids the baffle 8032, the baffle 8032 is no longer restricted and moves horizontally with the material pushing seat 803, the material pushing seat 803 can transport the material falling into the concave hole 8031 of the material pushing seat 803 in the discharging shell 5 to the upper side of the lifting plate 3 while pushing the material between the lifting plate 3 and the inner wall of the material conveying shell 4 out, at this time the second positioning groove 11 of the baffle 8032 is placed on the upper side of the positioning rod body 9042, the positioning rod body 9042 is inserted into the second positioning groove 11 of the baffle 8032 under the push of the elastic telescopic rod 9041, the curved surface on one side of the first slope 9043 of the positioning rod body 9042 abuts against the inner wall of the positioning groove 11, and the position of the baffle 8032 at this time is limited;

[0057] Subsequently, the output shaft of the winding motor 603 is controlled to rotate reversely, the first pull rope 6013 no longer applies force to the sliding plate 8, the sliding plate 8 is reset under the pull of the stretched first elastic element 801, the second elastic element 802 is stretched, the second pull rope 6023 no longer applies force to the lifting plate 3, the lifting plate 3 moves downward under the action of its own gravity, the modified sisal fiber material moves downward synchronously and falls into the cylinder 101, after the lifting plate 3 descends by a certain height, the lifting plate 3 abuts against the movable rod 904 of the first pneumatic elastic telescopic pipe 9, when the movable rod 904 is forced to retract into the first pneumatic elastic telescopic pipe 9, the air in the first pneumatic elastic telescopic pipe 9 is guided to the second pneumatic elastic telescopic pipe 10 through the air pipe, the piston 902 of the second pneumatic elastic telescopic pipe 10 moves downward under the force, the piston 902 drives the positioning rod body 9042 to move downward through the elastic telescopic rod 9041, the curved surface of the positioning rod body 9042 leaves the positioning groove 11, then the baffle 8032 drives the material pushing seat 803 to reset under the action of the stretched second elastic element 802, the concave hole 8031 of the material pushing seat 803 re-catches the modified sisal fiber material falling from the discharging shell 5.

[0058] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art, according to the technical solution and inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A method for the physico-chemical combined modification of sisal fiber reinforced fillers fixed with lead, characterized in that, It comprises the following steps: S1, physical pretreatment of sisal fibers: the fibers are placed in a stirring barrel (1) to clean the surface impurities, then high-temperature drying treatment is carried out at 120°, and then the fibers are crushed into small pieces of about 2 cm for standby; S2, alkali immersion pretreatment of sisal fibers: the crushed sisal fibers are placed in a stirring barrel (1) containing a 15% NaOH solution for 3-4 hours to dissolve hemicellulose and lignin in the fibers and destroy the structure of cellulose molecules. Stirring is required during the soaking process to ensure that the lignin and hemicellulose in the fibers are fully destroyed. The stirring speed is 30 r / min. After alkali immersion, the fibers are washed with clean water; S3. Pretreatment of modified sisal fibers: Place the alkali-impregnated sisal fibers in a 10% solution. The solution was soaked in the stirring tank (1) for 24 hours. The purpose of this was to... Carboxyl groups in the solution are grafted onto the damaged cellulose molecules to enhance the fixation ability of heavy metal lead; in order to graft as many carboxyl functional groups as possible onto the cellulose molecules, the mixture is stirred at a constant speed of 30 r / min during the soaking process to prepare modified sisal fibers; after soaking, the fibers are dried directly without washing. S4, the full tailings slurry with a mass concentration of 10%-15% from the lead-zinc mine dressing plant is pumped to a deep-cone thickener or a vertical sand bin thickening device by a slurry pump to form a high-concentration full tailings slurry with a concentration of 73%-75%; S5, the modified sisal fibers obtained in step S3 are transported to a mixing barrel by a belt conveyor as an additive; the high-concentration full tailings slurry in step S4 is pumped to the mixing barrel by a slurry pump as a filling aggregate; the PO425 Portland cement in the cement bin is transported to the mixing barrel by a screw conveyor; and the industrial water in the water bin is transported to the mixing barrel by a clean water pump; after uniform stirring in the mixing barrel for 10-20 minutes, a homogeneous filling material slurry with a concentration of 61%-65% is formed; S6, the homogeneous filling material slurry is transported to the underground goaf by pumping or gravity; S7, after solidification for 7 days, 14 days, and 28 days underground, the in-situ filling body is drilled and cored, processed into standard samples, and then tested for uniaxial compressive strength according to the GB / T51450-2022 standard; then the in-situ filling body is tested for toxicity leaching according to the HJ557-2010 standard.

2. A method of physico-chemical combined modified sisal fiber reinforced insert lead fixation as claimed in claim 1 wherein, In the step S5, the number of portions of full tailings in the homogeneous filling material slurry is 60, the number of portions of cement is 10, and the number of portions of modified sisal fibers is 1-2.

3. A method of physico-chemical combined modified sisal fiber reinforced insert lead fixation as claimed in claim 1, wherein, The main chemical components of the lead-zinc mine full tailings in step S4 are Al2O3, SiO2, and FeS2. The particle size distribution is D03=1.474 μm, D06=2.521 μm, D30=9.570 μm, D70=74.53 μm, and D97=253.4 μm.

4. A device for the physico-chemical combined modified sisal fiber reinforced filling body lead fixation, comprising a stirring drum (1) in the method for the physico-chemical combined modified sisal fiber reinforced filling body lead fixation according to claim 1, characterized in that, The stirring barrels (1) in steps S1, S2, and S3 have the same structure, which comprises a barrel body (101), a rotating pipe (102) rotatably connected in the barrel body (101), a plurality of stirring blades (103) fixed at the bottom of the rotating pipe (102), a rotating rod (104) rotatably connected in the barrel body (101), and a stirring motor (105) fixed at the bottom of the barrel body (101) and used to drive the rotating rod (104) to rotate; The barrel (101) is fixed with a connecting pipe (2) connected with the rotating pipe (102), the connecting pipe (2) and the rotating rod (104) are slidably connected with the lifting plate (3), the top of the connecting pipe (2) is fixedly provided with a feeding shell (4), the feeding shell (4) is provided with a lifting assembly for lifting the lifting plate (3), the top of the feeding shell (4) is communicated with a discharging shell (5), the feeding shell (4) is provided with a pushing assembly for pushing the material in the discharging shell (5) to fall into the feeding shell (4), and the lifting assembly is connected with the pushing assembly; The lifting assembly comprises a support (6) fixedly arranged on the feeding shell (4), the support (6) is rotatably connected with a first rotating rod (601) and a second rotating rod (602), the first rotating rod (601) is provided with a first gear (6011), the second rotating rod (602) is provided with a second gear (6021) engaged with the first gear (6011), the second rotating rod (602) is provided with a second winding drum (6022), the second winding drum (6022) is wound with a second pulling rope (6023), one end of the second pulling rope (6023) away from the second winding drum (6022) penetrates through the feeding shell (4) and the connecting pipe (2) and is fixedly connected with the lifting plate (3), the feeding shell (4) is further fixedly provided with a winding motor (603) for driving the first rotating rod (601) to rotate through a supporting plate, the first rotating rod (601) is provided with a first winding drum (6012), the first winding drum (6012) is wound with a first pulling rope (6013), one end of the first pulling rope (6013) away from the first winding drum (6012) penetrates through the feeding shell (4) and is connected with the pushing assembly; The outer ring teeth of the first gear (6011) are provided with a vacancy (7), and the first gear (6011) and the second gear (6021) are intermittently engaged; The pushing assembly comprises a sliding plate (8) slidably connected in the feeding shell (4) and connected with the first pulling rope (6013), the sliding plate (8) and the inner wall of the feeding shell (4) are provided with a first elastic element (801), the side of the sliding plate (8) away from the first elastic element (801) is fixedly provided with a second elastic element (802), one end of the second elastic element (802) away from the sliding plate (8) is connected with a pushing seat (803), the pushing seat (803) is slidably connected in the feeding shell (4), the pushing seat (803) is provided with a recess hole (8031) communicated with the connecting pipe (2), and the pushing seat (803) is fixedly provided with a baffle (8032) for shielding the bottom opening of the discharging shell (5).

5. A device for physico-chemical combined modified sisal fiber reinforced insert lead fixation as claimed in claim 4 wherein, The connecting pipe (2) is provided with a first pneumatic elastic telescopic pipe (9) movably abutting against the lifting plate (3), the bottom of the material conveying shell (4) is fixedly provided with a second pneumatic elastic telescopic pipe (10), the first pneumatic elastic telescopic pipe (9) and the second pneumatic elastic telescopic pipe (10) are communicated with a gas pipe, and the baffle (8032) is provided with two positioning grooves (11) plugged with the second pneumatic elastic telescopic pipe (10).

6. A device for physico-chemical combined modified sisal fiber reinforced insert lead fixation as claimed in claim 5 wherein, The first pneumatic elastic telescopic pipe (9) and the second pneumatic elastic telescopic pipe (10) are the same in structure and each include a sleeve (901), a piston (902) slidably connected in the sleeve (901), a third elastic element (903) arranged between the piston (902) and the inner wall of the sleeve (901), and a movable rod (904) fixedly arranged on the piston (902), the end of the movable rod (904) of the first pneumatic elastic telescopic pipe (9) is provided with a circular arc surface, the circular arc surface movably abuts against the lifting plate (3), the movable rod (904) of the second pneumatic elastic telescopic pipe (10) includes an elastic telescopic rod (9041) fixedly connected with the piston (902) and a positioning rod body (9042) fixedly connected with the elastic telescopic rod (9041), the positioning rod body (9042) is movably plugged in the positioning groove (11) and movably abuts against the sliding plate (8), the two sides of the positioning rod body (9042) are respectively provided with a first inclined surface (9043) and a second inclined surface (9044), and the cross-sectional length of the first inclined surface (9043) is greater than that of the second inclined surface (9044).

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