Cemented filling equipment for the utilization of calcium oxide pretreated phosphogypsum and slag

Abstract

The present invention belongs to the technical field of phosphogypsum filling, in particular to a cemented filling method and equipment for the utilization of phosphogypsum pretreated with calcium oxide and slag. Aiming at the problem of easy secondary pollution in the existing technology, the following scheme is proposed. It includes a mixing tank, and a recovery tank is fixedly arranged below the mixing tank for collecting the supernatant after precipitation. One side of the mixing tank is provided with a base, and a fixed column is fixed on the top of the base. A rotating disk is rotatably sleeved on the outer wall of the fixed column, and a preparation tank is fixed at the top of the fixed column. In the present invention, by mixing phosphogypsum and calcium oxide in a certain proportion and performing alkali washing pretreatment, harmful components in the phosphogypsum can be effectively removed. In addition, after preparing a homogeneous cemented filling slurry, the cemented filling slurry can be formed and cured on the same equipment, which is convenient to use.

Description

Technical Field

[0001] The present invention relates to the technical field of phosphogypsum filling, and particularly to a cemented filling method and equipment for the utilization of calcium oxide pretreated phosphogypsum and slag. Background Art

[0002] Phosphogypsum is a large amount of industrial by-product generated during the production of phosphoric acid. About 4 to 6 tons of phosphogypsum will be produced for every 1 ton of phosphoric acid produced. Since phosphogypsum contains a certain amount of soluble fluorine (F), phosphorus (P) and other impurities, direct stacking not only occupies a large amount of land, but also may cause environmental pollution, such as fluorine pollution of groundwater. Therefore, how to effectively treat and utilize phosphogypsum is an urgent problem to be solved.

[0003] At present, the treatment and utilization methods of phosphogypsum mainly include the following several kinds:

[0004] Building materials: Phosphogypsum is used to produce building gypsum, gypsum board and gypsum bricks and other building materials. However, the market demand for these products is limited, and it is difficult to consume phosphogypsum on a large scale.

[0005] Agricultural fertilizers: After appropriate treatment, phosphogypsum can be used as a soil conditioner and fertilizer additive. However, its use is restricted by seasons and geographical conditions.

[0006] Mine filling: Using phosphogypsum to prepare a cemented filling body for filling the mined-out area of the mine. This method can not only effectively consume phosphogypsum, but also solve the problem of surface subsidence of the mine. However, currently mainly used is ordinary Portland cement, and its binding performance with phosphogypsum is poor, resulting in unsatisfactory strength and stability of the filling body.

[0007] In the prior art, there are still the following deficiencies in the process of preparing a high-performance cemented filling body:

[0008] The residual soluble fluorine and phosphorus elements in phosphogypsum may leach out during use, resulting in secondary pollution; at the same time, the existing treatment process is relatively complex and costly, and it is difficult to promote on a large scale. Therefore, there is an urgent need for a new treatment method that can not only effectively remove the harmful components in phosphogypsum, but also economically and efficiently prepare a high-performance cemented filling body.

[0009] In view of the above problems, the present invention document proposes a cemented filling method and equipment for the utilization of calcium oxide pretreated phosphogypsum and slag. Summary of the Invention

[0010] The purpose of the present invention is to solve the disadvantages of the existing ones that are prone to secondary pollution and require the use of additional equipment to perform compressive strength tests on the cemented filling body, and to propose a cemented filling method and equipment for the utilization of calcium oxide pretreated phosphogypsum and slag.

[0011] To achieve the above object, the present invention adopts the following technical solutions:

[0012] A cemented filling method for utilizing calcium oxide pretreated phosphogypsum and slag, comprising the following steps:

[0013] S1. Select the fully filtered phosphogypsum, and test its moisture content, pH value and quality;

[0014] S2. Prepare a 0.5‰ solution of APAM flocculant;

[0015] S3. Stir the phosphogypsum and calcium oxide evenly in a thickening device according to a mass ratio of 1:1 to remove the harmful components in the phosphogypsum;

[0016] S4. Add the APAM solution in the preparation device to accelerate flocculation sedimentation and the phosphogypsum with harmful components removed in step S3, and separate the supernatant and the high-concentration phosphogypsum;

[0017] S5. Mix the high-concentration phosphogypsum, deionized water and slag in the preparation device, and stir evenly to prepare a homogeneous cemented filling slurry;

[0018] S6. Test the compressive strength of the formed cemented filling body in the preparation device.

[0019] In a possible design, the pH value of the phosphogypsum is 2-4, and the mass ratio of calcium oxide to phosphogypsum is 1:1-2.

[0020] In a possible design, the alkali washing pretreatment time of the calcium oxide is at least 10 minutes, and the rotation speed is at least 200 r / min;

[0021] The mass ratio of the slag to the phosphogypsum is 1:6-1:8;

[0022] The mass concentration of the homogeneous filling slurry is 64%-68%, and the density is 2.2-2.5 g / cm 3 .

[0023] Specifically, the present invention is realized through the following steps:

[0024] Calcium oxide pretreatment: Mix the phosphogypsum and calcium oxide in a certain proportion, and carry out alkali washing pretreatment. Calcium oxide can react with the soluble fluorine and phosphorus elements in the phosphogypsum to form insoluble calcium fluoride and calcium phosphate, thereby effectively removing the harmful components in the phosphogypsum.

[0025] Flocculation sedimentation: Add APAM flocculant to the pretreated phosphogypsum slurry to accelerate the flocculation sedimentation process, so that the phosphogypsum particles quickly settle and separate, improving the treatment efficiency.

[0026] Slag admixture: The pre-treated and flocculated and settled phosphogypsum is mixed with slag in a certain proportion to prepare a homogeneous cemented filling slurry. As a low-cost and high-performance alternative material, slag not only reduces the production cost but also improves the strength and durability of the filling body.

[0027] Filling body preparation: The prepared cemented filling slurry is formed and cured to form a high-strength and low-pollution cemented filling body for filling the mined-out areas in mines.

[0028] Through the above method, the present invention not only effectively removes the soluble fluorine and phosphorus elements in phosphogypsum, avoiding secondary pollution, but also utilizes the industrial waste slag, reducing the production cost and significantly improving the mechanical properties and durability of the filling body. The experimental results show that the cemented filling body prepared by the method of the present invention has excellent compressive strength and long-term stability, and is an environmentally friendly material with broad application prospects.

[0029] The specific invention steps are as follows:

[0030] (1) Select the phosphogypsum with a certain moisture content after sufficient pressure filtration in the phosphoric acid production process, test the moisture content of the phosphogypsum using a rapid moisture detector, and measure its pH and mass at the same time;

[0031] (2) Take several granular APAM flocculants, add deionized water and use a magnetic stirrer to prepare an APAM solution with a mass fraction of 0.5‰;

[0032] (3) Uniformly stir the phosphogypsum and several flaky calcium oxides in a small thickening device in a certain proportion;

[0033] (4) Add a certain amount of APAM solution to the small thickening device to accelerate the flocculation, sedimentation and concentration of the phosphogypsum. After standing for 5 - 10 minutes, use the overflow valve and the bottom discharge port to separate the supernatant from the high-concentration phosphogypsum;

[0034] (5) After testing the moisture content of the high-concentration phosphogypsum, add a certain amount of deionized water and slag, and stir evenly to obtain the required homogeneous cemented filling slurry.

[0035] (6) Respectively, at 3 days, 7 days and 28 days after the homogeneous cemented filling slurry is molded, conduct uniaxial compressive strength tests on the test blocks. Take 3 blocks at each age period and take their average value as the compressive strength of the test blocks at that age period.

[0036] A preparation device is used for preparing a cemented filling body and testing its compressive strength in the above-mentioned method for utilizing cemented filling of pretreated phosphogypsum and slag with calcium oxide. It includes a stirring tank. A recovery tank is fixedly arranged below the stirring tank for collecting the supernatant after precipitation. A base is arranged on one side of the stirring tank. A fixed column is fixed on the top of the base. A rotating disk is rotatably sleeved on the outer wall of the fixed column. The top of the fixed column is fixed with a preparation tank for mixing high-concentration phosphogypsum, deionized water, and slag to form a homogeneous cemented filling slurry.

[0037] It also includes a preparation cylinder placed in the preparation tank. A pressure sensor is fixed at the bottom of the preparation cylinder and fixedly embedded in the bottom inner wall of the preparation tank. The cooperation between the pressure sensor and the preparation cylinder is used to weigh the mass of high-concentration phosphogypsum.

[0038] It also includes a plurality of forming grooves arranged on the top of the rotating disk for forming and curing the homogeneous cemented filling slurry in the forming grooves to form a high-strength and low-pollution cemented filling body. An impact block is arranged below the preparation tank for testing the compressive strength of the cemented filling body.

[0039] It also includes a second stirring shaft rotatably penetrating through the preparation tank. The bottom end of the second stirring shaft rotatably extends into the preparation tank for stirring high-concentration phosphogypsum, deionized water, and slag. A first cam is fixedly sleeved on the outer wall of the second stirring shaft above the preparation tank.

[0040] A separation structure is arranged between the stirring tank and the recovery tank for separating the supernatant in the stirring tank from the high-concentration phosphogypsum.

[0041] A filling structure is arranged in the preparation tank for uniformly filling the cemented filling slurry into the forming grooves.

[0042] A testing structure is arranged on one side of the preparation tank for testing the compressive strength of the cemented filling body in the forming grooves.

[0043] In a possible design, the separation structure includes a fixed pipe fixed to the top of the recycling box, and the bottom end of the fixed pipe extends into the recycling box. A drain pipe is slidably connected inside the fixed pipe, and the top end of the drain pipe is hermetically and slidably extended into the mixing box. The outer wall of the fixed pipe is provided with threads, and a threaded sleeve is sleeved on the outer wall of the fixed pipe in a threaded manner, and the threaded sleeve is rotatably arranged on the outer wall of the drain pipe. The cooperation between the threaded sleeve and the fixed pipe is used to control the lifting of the drain pipe. A first discharge pipe is fixed to the top of the recycling box, and the bottom end of the first discharge pipe extends into the recycling box. There is a discharge cylinder at the top of the first discharge pipe, and the top end of the discharge cylinder is fixedly extended into the mixing box. An inclined sieve plate is slidably arranged in the first discharge pipe for filtering high-concentration phosphogypsum. A guide pipe is fixedly penetrated through one side of the first discharge pipe, and one end of the guide pipe is located above the inclined sieve plate. The other end of the guide pipe is fixedly extended into the preparation box and cooperates with the preparation cylinder. An inclined baffle is fixed to one side of the first discharge pipe, and the inclined baffle is located above the guide pipe to prevent liquid from entering the preparation box through the guide pipe. A first stirring shaft is longitudinally and rotatably connected in the mixing box; rotating the threaded sleeve, the threaded connection between the threaded sleeve and the fixed pipe can control the lifting of the drain pipe. Opening the valve on the drain pipe can quickly discharge the supernatant above the high-concentration phosphogypsum into the recycling box. Then, opening the valve on the discharge cylinder, the high-concentration phosphogypsum in the mixing box enters the first discharge pipe through the discharge cylinder, and the inclined sieve plate filters the high-concentration phosphogypsum to filter the liquid contained therein, while the high-concentration phosphogypsum enters the preparation cylinder through the guide pipe.

[0044] In a possible design, the filling structure includes a second discharge pipe that slidably penetrates the inner wall of the bottom of the preparation tank. The top end of the second discharge pipe extends fixedly into the preparation cylinder and is communicated with the preparation cylinder. The second discharge pipe is used to inject cementitious filling slurry into the forming groove. A toothed ring is fixedly arranged on the top of the rotating disc. A driving motor is fixedly arranged on one side of the fixed column. The output shaft of the driving motor is fixedly provided with a spur gear that meshes with the toothed ring, and is used to drive a plurality of forming grooves to move sequentially below the second discharge pipe. Support columns are fixedly arranged on both sides of the top of the base, and the top ends of the support columns touch the bottom of the rotating disc to support the rotating disc. A knocking cylinder for knocking the rotating disc is slidably connected in each of the two support columns. A moving plate is slidably connected to the top of the base. One end of the moving plate sequentially penetrates the support column and the fixed column. A plurality of arc-shaped plates are fixedly arranged on the top of the moving plate. The bottom of the knocking cylinder is in a frustum shape, and the arc-shaped plates are used to drive the knocking cylinder to move upward. A fixed seat is fixedly arranged on the top of the preparation tank. An L-shaped rod slidably penetrates the fixed seat. The bottom end of the L-shaped rod is fixedly connected to the top of one side of the moving plate and is used to drive the moving plate to move. A push plate is fixedly arranged on the side end of the L-shaped rod, and the push plate is slidably arranged on the top of the preparation tank. A spring is fixedly arranged between the push plate and the fixed seat, and the spring is sleeved on the outer wall of the L-shaped rod to reset the push plate. The first cam, the spring and the push plate cooperate to drive the push plate to reciprocate. A plurality of second stoppers for limiting the push plate are fixedly arranged on the top of the preparation tank; when the valve on the second discharge pipe is opened, the slurry in the preparation cylinder falls into the forming groove. Then, the motor drives the second stirring shaft and the first cam to rotate. The cooperation between the protruding part of the first cam and the spring drives the push plate, the L-shaped rod and the moving plate to perform reciprocating linear movement. When the moving plate drives the arc-shaped plate to move, the cooperation between the arc-shaped plate and the knocking cylinder continuously knocks the rotating disc, so as to make the slurry falling into the forming groove evenly distributed in the forming groove. At the same time, the rotating disc is driven to rotate through the cooperation of the driving motor, the spur gear and the toothed ring, and the slurry can be injected into a plurality of forming grooves.

[0045] In a possible design, the testing structure includes a lifting plate slidably arranged on one side of the preparation tank. The bottom end of the lifting plate is fixedly connected to the top of the impact block. The lifting of the lifting plate and the impact block is used to knock the cementitious filling body in the forming groove. An arc-shaped block is slidably connected to the top of the preparation tank, and the arc-shaped block cooperates with the first cam. The top of the arc-shaped block and one side of the lifting plate are rotatably connected by the same hinge shaft to a connecting rod. The cooperation between the arc-shaped block and the connecting rod is used to drive the lifting plate to move upward. A plurality of placement boxes are fixedly arranged on one side of the lifting plate to control the knocking force of the impact block on the cementitious filling body. A first stopper for limiting the arc-shaped block is fixedly arranged on the top of the preparation tank; the second stirring shaft drives the first cam to rotate. The first cam pushes the arc-shaped block to move outward. The arc-shaped block drives the lifting plate to move upward through the connecting rod, and thus the up and down movement of the impact block can be controlled.

[0046] In a possible design, an arc-shaped baffle is slidably connected to the top of the preparation box. A first card slot is provided on one side of the arc-shaped block close to the arc-shaped baffle, and a second card slot is provided on one side of the push plate close to the arc-shaped baffle. Both sides of the arc-shaped baffle are respectively engaged with the first card slot and the second card slot to brake the arc-shaped block and the push plate respectively.

[0047] In a possible design, hoppers for injecting raw materials are provided on the top of the mixing box and one side of the preparation box. Valves are provided on the outer walls of the second discharge pipe, the drain pipe and the discharge cylinder. An inclined panel is fixed to the inner bottom wall of the mixing box to convey the precipitated phosphogypsum particles towards the discharge cylinder. A transparent glass is provided on one side of the mixing box to check the liquid level of the supernatant.

[0048] In a possible design, a rotating shaft located below the inclined sieve plate is rotatably connected in the first discharge pipe. A second cam for driving the inclined sieve plate to move up and down is fixedly sleeved on the outer wall of the rotating shaft. One end of the rotating shaft rotatably extends to one side of the first discharge pipe and is fixed with a second bevel gear. A transmission shaft is rotatably connected between the bottom of the mixing box and the top of the recovery box, and the top end of the transmission shaft is hermetically rotatably extended into the mixing box and fixedly connected to the bottom end of the first stirring shaft. A first bevel gear meshing with the second bevel gear is fixedly sleeved on the outer wall of the transmission shaft; when the high-concentration phosphogypsum enters the first discharge pipe, the first stirring shaft drives the transmission shaft to rotate, and the transmission shaft drives the second cam to rotate through the meshing of the first bevel gear and the second bevel gear. The second cam can continuously knock the inclined sieve plate to remove the moisture contained in the high-concentration phosphogypsum on the inclined sieve plate.

[0049] Beneficial effects: In the present invention, phosphogypsum and calcium oxide are stirred evenly in a thickening device according to a mass ratio of 1:1 to remove harmful components in the phosphogypsum; the phosphogypsum and calcium oxide are mixed in a certain proportion and subjected to alkali washing pretreatment. Calcium oxide can react with soluble fluorine and phosphorus elements in the phosphogypsum to form insoluble calcium fluoride and calcium phosphate, thereby effectively removing harmful components in the phosphogypsum;

[0050] In the present invention, a knocking cylinder is slidably connected in each of the two support columns. A moving plate is slidably connected to the top of the base. A plurality of arc-shaped plates are fixed to the top of the moving plate. An L-shaped rod is slidably penetrated through the fixed seat. The bottom end of the L-shaped rod is fixedly connected to the top of one side of the moving plate. A push plate is fixed to the side end of the L-shaped rod; the second stirring shaft drives the first cam to rotate, and the cooperation between the protruding part of the first cam and the spring drives the push plate, the L-shaped rod and the moving plate to perform reciprocating linear movement. The cooperation between the arc-shaped plate and the knocking cylinder continuously knocks the rotating disk to make the slurry falling into the forming groove evenly distributed in the forming groove.

[0051] In the present invention, by mixing phosphogypsum and calcium oxide in a certain proportion and performing alkali washing pretreatment, harmful components in the phosphogypsum can be effectively removed. In addition, after preparing the homogeneous cemented filling slurry, the cemented filling slurry can be formed and cured on the same equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 is a three-dimensional structural schematic diagram of a preparation device provided by the present invention;

[0053] Figure 2 is a front sectional structural schematic diagram of a preparation device provided by the present invention;

[0054] Figure 3 is a three-dimensional sectional structural schematic diagram of an inclined panel and a threaded sleeve of a preparation device provided by the present invention;

[0055] Figure 4 is a partial three-dimensional sectional structural schematic diagram of a discharge cylinder and a first discharge pipe of a preparation device provided by the present invention;

[0056] Figure 5 is a three-dimensional sectional structural schematic diagram of a preparation box and a rotating disk of a preparation device provided by the present invention;

[0057] Figure 6 is a three-dimensional exploded structural schematic diagram of a base and a rotating disk of a preparation device provided by the present invention;

[0058] Figure 7 is a three-dimensional structural schematic diagram of a preparation box of a preparation device provided by the present invention;

[0059] Figure 8 is a three-dimensional exploded structural schematic diagram of a preparation box, an arc-shaped baffle and a placement box of a preparation device provided by the present invention;

[0060] Figure 9 is a three-dimensional sectional structural schematic diagram of a support column and a knocking cylinder of a preparation device provided by the present invention;

[0061] Figure 10 is a partial three-dimensional sectional structural schematic diagram of a first discharge pipe and a discharge cylinder of a preparation device provided by the present invention.

[0062] In the figure: 1, stirring tank; 2, recycling box; 3, preparation box; 4, base; 5, fixed column; 6, rotating disk; 7, forming groove; 8, guide pipe; 9, first stirring shaft; 10, transparent glass; 11, inclined panel; 12, drain pipe; 13, fixed pipe; 14, threaded sleeve; 15, discharge cylinder; 16, first discharge pipe; 17, inclined baffle; 18, inclined sieve plate; 19, preparation cylinder; 20, pressure sensor; 21, second stirring shaft; 22, second discharge pipe; 23, drive motor; 24, straight gear; 25, toothed ring; 26, first cam; 27, fixed seat; 28, push plate; 29, L-shaped rod; 30, spring; 31, moving plate; 32, support column; 33, percussion cylinder; 34, arc plate; 35, arc block; 36, connecting rod; 37, lifting plate; 38, placing box; 39, impact block; 40, arc baffle; 41, first card slot; 42, second card slot; 43, first stop block; 44, second stop block; 45, rotating shaft; 46, second cam; 47, transmission shaft; 48, first bevel gear; 49, second bevel gear. Detailed implementation mode

[0063] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0064] Embodiment 1: A cemented filling method for the pretreatment of phosphogypsum and slag by calcium oxide, comprising the following steps:

[0065] (1) Select phosphogypsum with a certain moisture content after sufficient pressure filtration during the phosphoric acid production process, measure the moisture content, mass and PH of the phosphogypsum, and then grind its particle size to less than 3-5 mm using a ball mill; among them, the main chemical components of the phosphogypsum are SiO2, CaO and SO3, etc., and the particle size distribution is d10 = 3.52 μm, d30 = 18.14 μm, d50 = 42.93 μm, d60 = 45.97 μm, Cu = 13.06.

[0066] (2) Take a number of granular APAM flocculants, add deionized water and use a magnetic stirrer to prepare an APAM solution with a mass fraction of 0.5‰;

[0067] (3) Add calcium oxide and phosphogypsum to a small thickening device in a certain proportion and stir evenly. The mass ratio of calcium oxide to the mass of phosphogypsum (dry weight) is 1:1, the uniform stirring time is not less than 10 minutes, and the rotation speed is not less than 200 r / min;

[0068] (4) Add a certain amount of APAM solution to accelerate the flocculation sedimentation and concentration of phosphogypsum. After standing for 5-10 min, use the overflow valve and bottom discharge port to separate the supernatant from the high-concentration phosphogypsum;

[0069] (5) Add a certain mass of slag to high-concentration phosphogypsum, and add clear water to prepare a homogeneous cemented filling body, where the mass ratio of slag to phosphogypsum (dry weight) is 1:6.

[0070] (6) At 3 days, 7 days, and 28 days after the homogeneous cemented filling slurry is molded, conduct uniaxial compressive strength tests on the test blocks. Take 3 blocks for each age period and take their average value as the compressive strength of the test blocks at that age period.

[0071] (7) Treat the crushed test blocks after the 28-day compressive strength test to obtain leachate, and measure the fluorine leaching amount of the phosphogypsum filling body.

[0072] Example 2: According to the steps described in Example 1, modify step (3) to that the mass ratio of calcium oxide to the mass of phosphogypsum (dry weight) is 1:2, and prepare a homogeneous cemented filling body, with other steps unchanged.

[0073] Example 3: According to the steps described in Example 1, modify step (5) to that the mass ratio of slag to phosphogypsum (dry weight) is 1:8, and prepare a homogeneous cemented filling body, with other steps unchanged.

[0074] Example 4: According to the steps described in Example 1, modify step (3) to that the mass ratio of calcium oxide to the mass of phosphogypsum (dry weight) is 1:2; modify step (5) to that the mass ratio of slag to phosphogypsum (dry weight) is 1:8, and prepare a homogeneous cemented filling body, with other steps unchanged.

[0075] Comparative Example 1: According to the steps described in Example 1, modify step (5) to that the mass ratio of ordinary Portland cement to phosphogypsum (dry weight) is 1:8, and prepare a homogeneous cemented filling body, with other steps unchanged.

[0076] Comparative Example 2: According to the steps described in Example 1, omit the calcium oxide alkali washing pretreatment step in step (3), and prepare a homogeneous cemented filling body, with other steps unchanged.

[0077] Comparative Example 3: According to the steps described in Example 1, omit the calcium oxide alkali washing pretreatment step in step (3), and modify step (5) to that the mass ratio of ordinary Portland cement to phosphogypsum (dry weight) is 1:8, and prepare a homogeneous cemented filling body, with other steps unchanged.

[0078] Conduct compressive strength tests on the specimens in the comparative examples and examples at different age periods and count the F leaching amount at 28 days. The results are as follows:

[0079]

[0080] From the above table, by comparing Examples 1-4 with Comparative Examples 1-3, it can be found that when phosphogypsum is not pretreated by alkali washing and slag is used as the cementitious material, the compressive strength of the filling body at 28 days is 0.76 MPa, and the fluorine leaching amount is 14.6 mg / L; under the same conditions, when ordinary Portland cement is used as the cementitious material, the compressive strength of the filling body at 28 days is 0.86 MPa, and the fluorine leaching amount is 10.5 mg / L. When phosphogypsum is pretreated by calcium oxide alkali washing and ordinary Portland cement is used as the cementitious material, the compressive strength of the filling body at 28 days reaches 1.12 MPa, and the compressive strength of the filling bodies in Examples 1-4 reaches about 85% - 101% of it. This shows that the calcium oxide alkali washing pretreatment of phosphogypsum is not only an important factor for the strength increase of the filling body, but also the main source for reducing the fluorine leaching amount. Therefore, under the condition of calcium oxide alkali washing pretreatment, using slag as the cementitious material can not only meet the strength requirements for goaf filling treatment, but also control the fluorine leaching amount within 3.0 mg / L, with significant economic and environmental benefits.

[0081] The uniaxial compressive strength of the all-solid waste filling bodies in Examples 1-4 is between 0.96 and 1.14 MPa, and the fluorine leaching amount is distributed between 1.69 and 1.92 mg / L, indicating that the homogeneous cemented filling bodies of the vegetation in the implementation cases of the present invention all meet the strength requirements for underground goaf filling treatment and also reach the Class I - III water standards specified in the Groundwater Quality Standard (GB / T 14848 - 2017).

[0082] Example 6: Refer to Figures 1-9 , a preparation device, which is used in the field of phosphogypsum filling and is used for the preparation and compressive strength test of the cemented filling body in the above-mentioned cemented filling method for the utilization of calcium oxide pretreated phosphogypsum and slag. The specific implementation method is as follows:

[0083] Refer to Figure 1 and Figure 2 , this preparation device includes a stirring tank 1, and a recovery tank 2 is fixedly arranged below the stirring tank 1. The recovery tank 2 is used to collect the supernatant after precipitation. A base 4 is arranged on one side of the stirring tank 1, and a fixed column 5 is fixed on the top of the base 4. A rotating disk 6 is rotatably sleeved on the outer wall of the fixed column 5. The top of the fixed column 5 is fixed with a preparation tank 3, and the preparation tank 3 is used to mix high-concentration phosphogypsum, deionized water and slag to form a homogeneous cemented filling slurry.

[0084] Refer to Figure 2 and Figure 5 , inside the preparation tank 3, a preparation cylinder 19 is arranged. A pressure sensor 20 is fixed at the bottom of the preparation cylinder 19, and the pressure sensor 20 is fixedly embedded in the bottom inner wall of the preparation tank 3. The cooperation of the pressure sensor 20 and the preparation cylinder 19 is used to weigh the mass of the high-concentration phosphogypsum, so as to accurately control the amount of the high-concentration phosphogypsum used.

[0085] Reference Figure 2 、 Figure 5 and Figure 6 , a plurality of forming grooves 7 are provided at the top of the rotating disk 6, and these forming grooves 7 are used for forming and curing the homogeneous cemented filling slurry therein, so as to form a cemented filling body with high strength and low pollution. An impact block 39 is provided below the preparation box 3 for testing the compressive strength of the cemented filling body.

[0086] Reference Figure 2 and Figure 5 , in addition, the device further includes a second stirring shaft 21 that rotates through the preparation box 3, and the bottom end of the second stirring shaft 21 rotates and extends into the preparation box 3 for stirring a mixture of high-concentration phosphogypsum, deionized water and slag. A first cam 26 is fixedly sleeved on the outer wall of the second stirring shaft 21 and is located above the preparation box 3. The rotation of the first cam 26 can assist in stirring or pushing the materials.

[0087] Reference Figures 2-5 , in order to separate the supernatant from the high-concentration phosphogypsum, a separation structure is provided. The separation structure includes a fixed pipe 13 fixed on the top of the recovery box 2, and the bottom end of the fixed pipe 13 extends into the recovery box 2. A drain pipe 12 is slidably connected in the fixed pipe 13, and the top end of the drain pipe 12 is hermetically slidably extended into the stirring box 1. The outer wall of the fixed pipe 13 is provided with threads, and a threaded sleeve 14 is sleeved on the threads, and the threaded sleeve 14 is rotatably arranged on the outer wall of the drain pipe 12. By rotating the threaded sleeve 14, the lifting of the drain pipe 12 can be controlled.

[0088] Reference Figures 2-5 , a first discharge pipe 16 is also fixed on the top of the recovery box 2, and the bottom end of the first discharge pipe 16 extends into the recovery box 2. A discharge cylinder 15 is provided at the top of the first discharge pipe 16, and the top end of the discharge cylinder 15 is fixedly extended into the stirring box 1. An inclined sieve plate 18 is slidably arranged in the first discharge pipe 16, and the inclined sieve plate 18 is used for filtering the high-concentration phosphogypsum. A guide pipe 8 is fixedly penetrated through one side of the first discharge pipe 16, one end of the guide pipe 8 is located above the inclined sieve plate 18, and the other end is fixedly extended into the preparation box 3 and is matched with the preparation cylinder 19. An inclined baffle 17 is also fixed on one side of the first discharge pipe 16, and the inclined baffle 17 is located above the guide pipe 8 for preventing liquid from entering the preparation box 3 through the guide pipe 8. A first stirring shaft 9 is longitudinally rotatably connected in the stirring box 1 for stirring the mixed materials.

[0089] In use, first, the high-concentration phosphogypsum, deionized water, and slag in the stirring tank 1 are stirred and mixed by the first stirring shaft 9. Then, the threaded sleeve 14 is rotated to lower the drain pipe 12, and the valve on the drain pipe 12 is opened to discharge the supernatant liquid above the high-concentration phosphogypsum into the recovery tank 2. Next, the valve on the drain pipe 12 is closed, the drain pipe 12 is raised, and the valve on the discharge cylinder 15 is opened. The high-concentration phosphogypsum in the stirring tank 1 enters the first discharge pipe 16 through the discharge cylinder 15. When the high-concentration phosphogypsum passes through the inclined sieve plate 18, the liquid therein is filtered out, and the high-concentration phosphogypsum enters the preparation cylinder 19 through the guide pipe 8. At this time, the pressure sensor 20 can weigh the mass of the high-concentration phosphogypsum in the preparation cylinder 19.

[0090] Referring to Figure 5 and Figure 6 This preparation equipment further includes a filling structure. The filling structure includes a second discharge pipe 22 that slidably penetrates the inner wall of the bottom of the preparation tank 3. The top end of the second discharge pipe 22 is fixedly extended into the preparation cylinder 19 and is in communication with the preparation cylinder 19. The second discharge pipe 22 is used to inject the cementitious filling slurry into the forming groove 7. A toothed ring 25 is fixedly mounted on the top of the rotating disk 6, and a driving motor 23 is fixedly mounted on one side of the fixed column 5. A spur gear 24 that meshes with the toothed ring 25 is fixedly mounted on the output shaft of the driving motor 23. When the driving motor 23 is started, through the meshing relationship between the spur gear 24 and the toothed ring 25, the rotating disk 6 can be driven to rotate, so that a plurality of forming grooves 7 are sequentially moved below the second discharge pipe 22.

[0091] Referring to Figure 2 , Figure 6 and Figure 9 On both sides of the top of the base 4, support columns 32 are fixedly mounted. The top ends of the support columns 32 touch the bottom of the rotating disk 6 to support the rotating disk 6. A knocking cylinder 33 is slidably connected inside both support columns 32. The bottom of the knocking cylinder 33 is in a frustum shape and is used to knock the rotating disk 6. A moving plate 31 is also slidably connected to the top of the base 4. One end of the moving plate 31 sequentially penetrates the support column 32 and the fixed column 5. A plurality of arc-shaped plates 34 are fixedly mounted on the top of the moving plate 31. When the moving plate 31 moves, the arc-shaped plates 34 will drive the knocking cylinder 33 to move upward, so that the knocking cylinder 33 knocks the rotating disk 6.

[0092] Referring to Figure 5 , Figure 7 and Figure 8, a fixed seat 27 is fixed to the top of the preparation box 3. An L-shaped rod 29 slidably penetrates through the fixed seat 27, and the bottom end of the L-shaped rod 29 is fixedly connected to the top of one side of the moving plate 31. A push plate 28 is fixed to the side end of the L-shaped rod 29. The push plate 28 is slidably arranged on the top of the preparation box 3. A spring 30 is fixed between the push plate 28 and the fixed seat 27. The spring 30 is sleeved on the outer wall of the L-shaped rod 29. In addition, a first cam 26 is also fixed to the top of the preparation box 3. The first cam 26, the spring 30 and the push plate 28 cooperate to drive the push plate 28 to move reciprocally. The top of the preparation box 3 is also fixed with a plurality of second stoppers 44 for limiting the push plate 28 to ensure the moving range of the push plate 28.

[0093] During the preparation process, first, open the valve on the second discharge pipe 22, and the slurry in the preparation cylinder 19 will fall into the forming groove 7. Then, the motor drives the second stirring shaft 21 and the first cam 26 to rotate. The protruding part of the first cam 26 will cooperate with the spring 30 to drive the push plate 28, the L-shaped rod 29 and the moving plate 31 to perform reciprocating linear motion. When the moving plate 31 drives the arc-shaped plate 34 to move, the arc-shaped plate 34 will cooperate with the knocking cylinder 33 to continuously knock the rotating disc 6, so that the slurry falling into the forming groove 7 is evenly distributed in the forming groove 7, which is convenient for later compressive strength testing. At the same time, through the cooperation of the driving motor 23, the spur gear 24 and the toothed ring 25, the rotating disc 6 can be driven to rotate, so as to inject slurry into a plurality of forming grooves 7.

[0094] Refer to Figures 5-7 , the testing structure includes a lifting plate 37 slidably arranged on one side of the preparation box 3. The bottom end of the lifting plate 37 is fixedly connected to the top of the impact block 39. The downward fall of the lifting plate 37 and the impact block 39 is used to knock the cemented filling body in the forming groove 7 to test its compressive strength.

[0095] Refer to Figure 7 and Figure 8 , an arc-shaped block 35 is slidably connected to the top of the preparation box 3. The arc-shaped block 35 cooperates with the first cam 26. The top of the arc-shaped block 35 and one side of the lifting plate 37 are rotatably connected by a hinge shaft with a connecting rod 36. The cooperation of the arc-shaped block 35 and the connecting rod 36 is used to drive the lifting plate 37 to move upward. A plurality of placement boxes 38 are fixed to one side of the lifting plate 37 to control the knocking force of the impact block 39 on the cemented filling body. The top of the preparation box 3 is also fixed with a first stopper 43 for limiting the arc-shaped block 35.

[0096] During the preparation process, the second stirring shaft 21 drives the first cam 26 to rotate. When the protruding part of the first cam 26 contacts the arc-shaped block 35, it will push the arc-shaped block 35 to move outward. The arc-shaped block 35 drives the lifting plate 37 to move upward through the connecting rod 36, and then can control the up and down movement of the impact block 39 to impact the cemented filling body in the forming groove 7 for compressive strength testing. In addition, corresponding weights can be added to the placement box 38 to control the impact strength.

[0097] Refer to Figure 7 and Figure 8 , and an arc-shaped baffle 40 is also slidably connected to the top of the preparation box 3. A first card slot 41 is provided on one side of the arc-shaped block 35 close to the arc-shaped baffle 40, and a second card slot 42 is provided on one side of the push plate 28 close to the arc-shaped baffle 40. Both sides of the arc-shaped baffle 40 are respectively engaged with the first card slot 41 and the second card slot 42 to brake the arc-shaped block 35 and the push plate 28 respectively.

[0098] During the preparation process, when the first cam 26 rotates, its protruding part will first contact the arc-shaped block 35 and push the arc-shaped block 35 to move outward. At this time, the arc-shaped baffle 40 is engaged with the first card slot 41 to brake the arc-shaped block 35, keeping the lifting plate 37 in the upward movement state. When the first cam 26 continues to rotate and its protruding part separates from the arc-shaped block 35, the arc-shaped block 35 will move downward under the gravity of the connecting rod 36 and the placement box 38, and then drive the lifting plate 37 and the impact block 39 to fall and strike the cemented filling body in the forming groove 7. Then, the protruding part of the first cam 26 will contact the push plate 28 and push the push plate 28 to move to one side. At this time, the arc-shaped baffle 40 is engaged with the second card slot 42 to brake the push plate 28. When the first cam 26 continues to rotate and its protruding part separates from the push plate 28, the push plate 28 will reset under the elastic force of the spring 30, and then drive the L-shaped rod 29, the moving plate 31 and the arc-shaped plate 34 to move, so that the knocking cylinder 33 knocks the rotating disk 6, making the slurry evenly distributed in the forming groove 7.

[0099] By braking the arc-shaped block 35 and the push plate 28 respectively by the arc-shaped baffle 40, the filling structure and the testing structure can be alternately driven to operate when the first cam 26 rotates, realizing the continuous preparation and testing.

[0100] Refer to Figure 1 , Figure 2 and Figure 5, at the top of the stirring tank 1 of this preparation equipment, a hopper is designed, and this hopper is used to inject raw materials into the stirring tank 1, such as phosphogypsum, water and other necessary additives. Similarly, a hopper is also provided on one side of the preparation tank 3 for injecting the required raw materials into the preparation tank 3. At the bottom of the stirring tank 1, an inclined panel 11 is provided, and this inclined panel 11 is fixed to the inner wall of the bottom of the stirring tank 1. Its function is to convey the phosphogypsum particles deposited at the bottom of the stirring tank 1 towards the discharge cylinder 15 to ensure that the phosphogypsum particles can be discharged smoothly. In addition, valves are installed on the outer walls of the second discharge pipe 22, the drain pipe 12 and the discharge cylinder 15. These valves can control the opening and closing of the corresponding pipelines, thereby achieving precise control of the material flow. To facilitate observing the liquid level of the supernatant in the stirring tank 1, a transparent glass 10 is specially provided on one side of the stirring tank 1. Operators can directly view the liquid level of the supernatant through this transparent glass 10 to ensure the smooth progress of the preparation process.

[0101] Through the above implementation method, this preparation equipment can efficiently and accurately prepare a high-strength and low-pollution cemented filling body, and conduct compressive strength tests to meet actual requirements.

[0102] Example 7: Refer to Figure 10 , on the basis of Example 1, an improvement is made: inside the first discharge pipe 16, a rotating shaft 45 is designed to be rotatably connected. This rotating shaft 45 is located below the inclined sieve plate 18, and a second cam 46 is fixedly sleeved on its outer wall. The function of this second cam 46 is to continuously knock on the inclined sieve plate 18 during rotation, thereby helping the high-concentration phosphogypsum on the inclined sieve plate 18 to remove the contained moisture. One end of the rotating shaft 45 rotates and extends to one side of the first discharge pipe 16 and is fixed with a second bevel gear 49. In addition, a transmission shaft 47 is rotatably connected between the bottom of the stirring tank 1 and the top of the recovery tank 2. The top end of this transmission shaft 47 is hermetically rotated and extended into the stirring tank 1 and is fixedly connected to the bottom end of the first stirring shaft 9. Therefore, when the first stirring shaft 9 rotates, it will drive the transmission shaft 47 to rotate together. A first bevel gear 48 meshing with the second bevel gear 49 is fixedly sleeved on the outer wall of the transmission shaft 47. In this way, when the transmission shaft 47 rotates, it will drive the rotating shaft 45 and the second cam 46 to rotate through the meshing of the first bevel gear 48 and the second bevel gear 49.

[0103] In actual operation, when the high-concentration phosphogypsum enters the first discharge pipe 16, the first stirring shaft 9 will drive the transmission shaft 47 to rotate, and then drive the second cam 46 to rotate through the meshing of the first bevel gear 48 and the second bevel gear 49. The rotation of the second cam 46 will continuously knock on the inclined sieve plate 18 to help the high-concentration phosphogypsum on the inclined sieve plate 18 remove the contained moisture, thereby improving the preparation efficiency and quality of phosphogypsum.

[0104] Through the above design, this preparation equipment not only realizes the precise control of the phosphogypsum preparation process, but also improves the preparation efficiency and quality of phosphogypsum through an innovative mechanical structure, with significant technical effects and practical application value.

[0105] A method for using a preparation equipment includes the following steps:

[0106] S1. Inject a certain amount of APAM solution and phosphogypsum after removing soluble F and P elements in phosphogypsum through calcium oxide alkali washing pretreatment into the stirring tank 1 through the feed hopper. Drive the first stirring shaft 9 by a motor to fully mix the solution and phosphogypsum, and then let it stand for 5 - 10 minutes. The APAM solution accelerates flocculation and sedimentation to separate the supernatant and high-concentration phosphogypsum;

[0107] S2. After observing the heights of the supernatant and high-concentration phosphogypsum in the stirring tank 1 through the transparent glass 10, rotate the threaded sleeve 14. The threaded connection between the threaded sleeve 14 and the fixed pipe 13 can control the lifting of the drain pipe 12. Open the valve on the drain pipe 12 to quickly discharge the supernatant above the high-concentration phosphogypsum into the recovery tank 2. Then open the valve on the discharge cylinder 15. The high-concentration phosphogypsum in the stirring tank 1 enters the first discharge pipe 16 through the discharge cylinder 15, and the inclined sieve plate 18 filters the high-concentration phosphogypsum to filter out the liquid contained therein, while the high-concentration phosphogypsum enters the preparation cylinder 19 through the guide pipe 8;

[0108] S3. In addition, when the high-concentration phosphogypsum enters the first discharge pipe 16, the first stirring shaft 9 drives the transmission shaft 47 to rotate. The transmission shaft 47 drives the second cam 46 to rotate through the meshing of the first bevel gear 48 and the second bevel gear 49. The second cam 46 can continuously knock on the inclined sieve plate 18 to remove the water contained in the high-concentration phosphogypsum on the inclined sieve plate 18;

[0109] S4. When the high-concentration phosphogypsum enters the preparation cylinder 19, the pressure sensor 20 can detect the mass of the high-concentration phosphogypsum. Inject an appropriate amount of deionized water and slag into the preparation tank 3 through the feed hopper as needed, and drive the second stirring shaft 21 by a motor to rotate and stir evenly to prepare a homogeneous cementitious filling slurry;

[0110] S5. Open the valve on the second discharge pipe 22, and the slurry in the preparation cylinder 19 falls into the forming groove 7. Then, the motor drives the second stirring shaft 21 and the first cam 26 to rotate. The cooperation between the protruding part of the first cam 26 and the spring 30 drives the push plate 28, the L-shaped rod 29, and the moving plate 31 to perform reciprocating linear movement. When the moving plate 31 drives the arc plate 34 to move, the cooperation between the arc plate 34 and the knocking cylinder 33 continuously knocks the rotating disk 6, so as to make the slurry falling into the forming groove 7 evenly distributed in the forming groove 7, which is convenient for later compressive strength testing. At the same time, through the cooperation of the driving motor 23, the spur gear 24, and the toothed ring 25, the rotating disk 6 is driven to rotate, and the slurry can be injected into multiple forming grooves 7;

[0111] S6. When compressive strength testing is required, push the push plate 28 outward until the push plate 28 touches the second stopper 44, push the arc-shaped baffle 40 to move, and snap the arc-shaped baffle 40 into the second card slot 42 to brake the push plate 28. After the arc-shaped block 35 loses the braking of the arc-shaped baffle 40, it is pushed by the gravity of the impact block 39 and the lifting plate 37 to move towards the middle. Then, the second stirring shaft 21 drives the first cam 26 to rotate, and the first cam 26 pushes the arc-shaped block 35 to move outward. The arc-shaped block 35 drives the lifting plate 37 to move upward through the connecting rod 36, and then the impact block 39 can be controlled to move up and down to impact the cemented filling body in the forming groove 7 for testing its compressive strength. In addition, corresponding weights can be added to the placement box 38 to control the impact strength.

[0112] However, as is well known to those skilled in the art, the working principle and wiring method of the driving motor 23 are common knowledge, and they all belong to conventional means or well-known common sense, so they will not be elaborated here. Those skilled in the art can make arbitrary selections according to their needs or convenience.

[0113] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent replacements or changes, and should be covered by the protection scope of the present invention.

Claims

1. A cementing filling device for utilizing calcium oxide pretreated phosphogypsum and slag, characterized in that: It comprises a mixing box (1), a recovery box (2) is fixedly provided below the mixing box (1) for collecting the supernatant after precipitation, a base (4) is provided on one side of the mixing box (1), a fixed column (5) is fixed on the top of the base (4), a rotating disk (6) is rotatably sleeved on the outer wall of the fixed column (5), and a preparation box (3) is fixed on the top of the fixed column (5) for mixing high-concentration phosphogypsum with deionized water and slag to form a homogeneous cementitious filling slurry; It also includes a preparation tube (19) placed in the preparation box (3), a pressure sensor (20) is fixed to the bottom of the preparation tube (19), and the pressure sensor (20) is fixedly embedded in the bottom inner wall of the preparation box (3), and the pressure sensor (20) cooperates with the preparation tube (19) to weigh the mass of the high-concentration phosphogypsum; It also includes a plurality of molding grooves (7) arranged on the top of the rotating disk (6), which are used to mold and solidify the homogeneous cementing filling slurry in the molding grooves (7) to form a high-strength, low-pollution cementing filling body. An impact block (39) is provided below the preparation box (3) to test the compressive strength of the cementing filling body. It also includes a second stirring shaft (21) that rotates and penetrates the preparation box (3), the bottom end of the second stirring shaft (21) rotates and extends into the preparation box (3) to stir the high-concentration phosphogypsum mixed with deionized water and slag, and the outer wall of the second stirring shaft (21) is fixedly sleeved with a first cam (26) located above the preparation box (3); A separation structure is arranged between the mixing tank (1) and the recovery tank (2) and is used to separate the supernatant in the mixing tank (1) from the high-concentration phosphogypsum; The filling structure is arranged in the preparation box (3) and is used to uniformly fill the cementing filling slurry into the forming groove (7).

2. The cementing filling equipment for calcium oxide pre-treated phosphogypsum and slag according to claim 1, characterized in that: The separation structure comprises a fixed pipe (13) fixed on the top of the recovery box (2), and the bottom end of the fixed pipe (13) extends into the recovery box (2); a drain pipe (12) is slidably connected inside the fixed pipe (13), and the top end of the drain pipe (12) is sealed and slidably extended into the mixing box (1); the outer wall of the fixed pipe (13) is provided with a thread, and the outer wall of the fixed pipe (13) is threadedly sleeved with a threaded sleeve (14), and the threaded sleeve (14) is rotatably arranged on the outer wall of the drain pipe (12); the threaded sleeve (14) cooperates with the fixed pipe (13) to control the lifting and lowering of the drain pipe (12); a first discharge pipe (16) is fixed on the top of the recovery box (2), and the bottom end of the first discharge pipe (16) extends into the recovery box (2); the first discharge pipe (16) ) is provided with a discharge barrel (15) at the top, and the top end of the discharge barrel (15) is fixedly extended into the mixing box (1), an inclined screen plate (18) is slidably provided in the first discharge pipe (16) for filtering high-concentration phosphogypsum, a guide pipe (8) is fixedly passed through one side of the first discharge pipe (16), and one end of the guide pipe (8) is located above the inclined screen plate (18), the other end of the guide pipe (8) is fixedly extended into the preparation box (3) and cooperates with the preparation barrel (19), a sloped baffle (17) is fixedly provided on one side of the first discharge pipe (16), and the sloped baffle (17) is located above the guide pipe (8) for preventing liquid from entering the preparation box (3) through the guide pipe (8), and a first stirring shaft (9) is longitudinally rotatably connected in the mixing box (1).

3. The cementing filling equipment for utilizing calcium oxide pretreated phosphogypsum and slag according to claim 2, characterized in that: The filling structure comprises a second discharge pipe (22) which slides through the inner wall of the bottom of the preparation box (3), the top end of the second discharge pipe (22) is fixedly extended into the preparation tube (19) and is connected to the preparation tube (19), and the second discharge pipe (22) is used to inject the cementing filling slurry into the forming groove (7), the top of the rotating disk (6) is fixed with a gear ring (25), one side of the fixed column (5) is fixed with a driving motor (23), and the output shaft of the driving motor (23) is fixed with a gear ring (25) which meshes with the gear ring (25). The spur gear (24) is used to drive the multiple forming grooves (7) to move sequentially to the bottom of the second discharge pipe (22). Support columns (32) are fixed on both sides of the top of the base (4), and the top of the support column (32) touches the bottom of the rotating disk (6) to support the rotating disk (6). The two support columns (32) are slidably connected with a knocking cylinder (33) for knocking the rotating disk (6). The top of the base (4) is slidably connected with a moving plate (31), and one end of the moving plate (31) is sequentially penetrated. The support column (32) and the fixed column (5) are passed through, a plurality of arc-shaped plates (34) are fixed on the top of the movable plate (31), the bottom of the knocking cylinder (33) is in a frustum shape, and the arc-shaped plates (34) are used to drive the knocking cylinder (33) to move upward, a fixed seat (27) is fixed on the top of the preparation box (3), an L-shaped rod (29) is slidably penetrated in the fixed seat (27), the bottom end of the L-shaped rod (29) is fixedly connected to the top of one side of the movable plate (31), and is used to drive the movable plate (31) to move, and the L-shaped rod A push plate (28) is fixed to the side end of the (29), and the push plate (28) is slidably arranged on the top of the preparation box (3), a spring (30) is fixed between the push plate (28) and the fixed seat (27), and the spring (30) is sleeved on the outer wall of the L-shaped rod (29) for resetting the push plate (28), the first cam (26), the spring (30) and the push plate (28) cooperate to drive the push plate (28) to reciprocate, and a plurality of second stoppers (44) for limiting the push plate (28) are fixed to the top of the preparation box (3).

4. The cementing filling equipment for utilizing calcium oxide pretreated phosphogypsum and slag according to claim 3, characterized in that: The test structure is also included, which is arranged on one side of the preparation box (3) and is used to test the compressive strength of the cementing filling body in the forming groove (7). The test structure includes a lifting plate (37) which is slidably arranged on one side of the preparation box (3). The bottom end of the lifting plate (37) is fixedly connected to the top of the impact block (39). The lifting plate (37) and the impact block (39) fall downward to knock the cementing filling body in the forming groove (7). The top of the preparation box (3) is slidably connected to an arc block (35), and the arc block (35) ) cooperates with the first cam (26), the top of the arc block (35) and one side of the lifting plate (37) are rotatably connected to the same connecting rod (36) through a hinge shaft, the cooperation between the arc block (35) and the connecting rod (36) is used to drive the lifting plate (37) to move upward, a plurality of placement boxes (38) are fixed on one side of the lifting plate (37) for controlling the force of the impact block (39) striking the cementing filling body, and the top of the preparation box (3) is fixed with a first stopper (43) for limiting the arc block (35).

5. The cementing filling equipment for utilizing calcium oxide pretreated phosphogypsum and slag according to claim 4, characterized in that: The top of the preparation box (3) is slidably connected with an arc-shaped baffle (40); a first clamping groove (41) is provided on a side of the arc-shaped block (35) close to the arc-shaped baffle (40); a second clamping groove (42) is provided on a side of the push plate (28) close to the arc-shaped baffle (40); and two sides of the arc-shaped baffle (40) are respectively engaged with the first clamping groove (41) and the second clamping groove (42) for braking the arc-shaped block (35) and the push plate (28) respectively.

6. The cementing filling equipment for utilizing calcium oxide pretreated phosphogypsum and slag according to claim 5, characterized in that: A hopper for injecting raw materials is provided on the top of the mixing box (1) and one side of the preparation box (3); valves are provided on the outer walls of the second discharge pipe (22), the liquid discharge pipe (12) and the discharge barrel (15); an inclined panel (11) is fixed to the inner wall of the bottom of the mixing box (1) for conveying the precipitated phosphogypsum particles toward the discharge barrel (15); and a transparent glass (10) is provided on one side of the mixing box (1) for checking the liquid level of the supernatant.

7. The cementing filling equipment for utilizing calcium oxide pretreated phosphogypsum and slag according to claim 5, characterized in that: A rotating shaft (45) located below the inclined screen plate (18) is rotatably connected inside the first discharge pipe (16), and a second cam (46) for driving the inclined screen plate (18) to move up and down is provided on the outer wall fixed sleeve of the rotating shaft (45), one end of the rotating shaft (45) is rotatably extended to one side of the first discharge pipe (16) and is fixed with a second bevel gear (49), a transmission shaft (47) is rotatably connected between the bottom of the mixing box (1) and the top of the recovery box (2), and the top end of the transmission shaft (47) is sealed and rotatably extended into the mixing box (1) and is fixedly connected to the bottom end of the first mixing shaft (9), and a first bevel gear (48) meshing with the second bevel gear (49) is provided on the outer wall fixed sleeve of the transmission shaft (47).

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