Integrated preparation device for ball-milling ash-based passivation material

Abstract

The invention relates to an integrated preparation device for a ball-milling ash-based passivation material. The integrated preparation device comprises a feeding system, a ball-milling system, a washing and centrifuging system and a drying system, wherein the feeding system comprises a storage unit and a feeding pipeline; the ball milling system is connected with the feeding system; the ball milling system is positioned below the feeding system for a certain distance, and feeding is realized by utilizing gravity; the washing centrifugal system is connected with the ball milling system and comprises a centrifugal machine, a cleaning liquid storage tank, a waste liquid storage tank, a liquid conveying pipeline, a discharging pipeline and an automatic pH meter; and the drying system is connected with the washing and centrifuging system and comprises a feeding pipeline and a dryer. According to the invention, the ball milling system and the washing centrifugal system which are automatically controlled are designed, so that the purposes of efficiently preparing the ash-based passivation material and automatically washing pH are achieved.

Description

Technical Field

[0001] The patent of this invention belongs to the technical field of equipment related to the preparation of fly ash materials, specifically an integrated preparation device for ball-milled ash-based passivation materials. Background Art

[0002] At present, soil heavy metal remediation mainly adopts passivation technology, the principle of which is that the passivator changes the chemical form and occurrence state of heavy metals in the soil, thereby reducing its bioavailability and mobility, and reducing the absorption of heavy metals by plants. There are many types of passivators. Suitable passivators are essential for achieving efficient and sustainable soil remediation. Selecting a low-cost and high-efficiency passivation material is the key. Fly ash is a by-product of coal-fired power plants. It has a wide range of sources and low costs. It is widely used because of its advantages of improving soil structure, increasing soil fertility, and regulating soil pH. In recent years, the research on fly ash passivators has mainly focused on improving passivation efficiency and soil remediation effects. Although fly ash passivators have shown great potential in the field of soil remediation, the efficiency and effect of their preparation process cannot be ignored. In order to ensure the quality and stability of the passivator and meet the needs of large-scale production, it is particularly important to develop an efficient fly ash passivator preparation device.

[0003] The preparation of ball-milled ash-based passivation materials requires a series of operations including mixing reaction, ball milling, washing centrifugation, and drying. However, existing technical equipment has problems such as low efficiency, large equipment space occupation, inability to prepare automatically, and low safety. For example, the ball milling device for preparing fly ash proposed in utility model patent CN 221183037 U is a preparation device for systematically preparing ball-milled materials, but the process is complicated and difficult to achieve large-scale, integrated, and automated preparation, which makes the prepared ball-milled materials have high heterogeneity. In order to achieve integrated, automatic, efficient, and batch stable preparation of ball-milled materials, reduce human and material losses, save space, and make the prepared materials stable, with a larger interface bonding area and strong adsorption capacity, we proposed an integrated preparation device for ball-milled ash-based passivation materials. Summary of the invention

[0004] The problem to be solved by the present invention is to provide an integrated preparation device for ball-milled ash-based passivation materials. A single-chamber ball mill controlled by an automated system, a washing and centrifugal integrated device, and a drying and air-drying integrated device are designed, which can not only achieve efficient preparation of ball-milled materials, but also reduce the loss rate of ball-milled materials, thereby reducing production costs and manpower.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: Provide an integrated preparation device for ball-milled ash-based passivation materials, characterized in that it includes a feeding system, a ball-milling system, a washing centrifugal system, and a drying system; The feeding system includes a central console, a material storage unit, and a feeding pipeline; The ball milling system is connected to the feeding system, which includes a ball milling tank; The washing centrifugal system is connected to the ball milling system, and includes a centrifuge, a cleaning liquid storage tank, a waste liquid storage tank, a liquid infusion pipeline, a material discharge pipeline, and an automatic pH meter; In a preferred embodiment of the present invention, the feeding system includes a fly ash providing unit, a calcium hydroxide providing unit, a potassium dihydrogen phosphate providing unit, and a deionized water providing unit; In a preferred embodiment of the present invention, the feed pipeline includes a liquid delivery pipeline and a powder delivery pipeline; The end of the powder delivery pipeline is connected to a powder delivery pump, and the discharge port at the lower end of the powder delivery pump and the water outlet of the liquid delivery pipeline are both directly opposite to the feed port of the ball mill.

[0006] In a preferred embodiment of the present invention, the washing centrifugal system includes a water adding device, a water pumping device, a centrifugal device, an intelligent pH detection system, a feed inlet, and a discharge port; The washing centrifugal system is composed of two closed inner and outer containers, with no external medium between the two containers, and two symmetrically placed centrifugal cylinders. The washing centrifugal system has a feed inlet at the upper end and a discharge outlet at the lower end, both of which are equipped with valve control, and a powder delivery pump at the lower end; The water adding device is located outside the shell of the washing centrifugal system, and is composed of a water delivery pipeline, a valve, and a water storage tank, and is connected to the powder delivery pipeline and connected to the feed port for delivery; The intelligent pH detection system is respectively located on the outer wall of the water pumping pipe. The upper feed pipe and the water pumping pipe of the washing centrifugal system are connected with an automatic telescopic shell to control the expansion and contraction of the pipe before and after the centrifugal process. When the cleaning is completed and the water is discharged, the intelligent pH detection system automatically detects the pH of the solution and displays the pH value on the display screen for confirmation of the subsequent steps.

[0007] The pumping devices are located at the upper ends of the two centrifuges, and are composed of valves, centrifugal pumps and water storage tanks; In a preferred embodiment of the present invention, the upper feed pipe and the water pumping pipe of the washing centrifuge system are both connected with an automatic telescopic shell to control the expansion and contraction of the pipe before and after the centrifugation process.

[0008] In a preferred embodiment of the present invention, the drying system includes a drying device and an air drying device; The drying device and air-drying device are integrated devices. The drying device is divided into an inner capsule and an outer layer. The outer layer is embedded with a heating wire, and the inner capsule wall is embedded with a fan. The fan is turned on in the early stage of drying to accelerate moisture separation, and the fan is turned off after the moisture is basically evaporated.

[0009] The present invention provides an integrated device for ball-milling ash-based passivation materials, which can realize automatic, efficient and stable batch preparation of ball-milled materials, and can also separate ball-milled impurities, so that the prepared materials have stability, larger interface bonding area and stronger adsorption capacity.

[0010] Beneficial effects: The present invention designs a feeding system, and each storage unit is distinct, which can realize accurate feeding of each storage material, and after mixing, it is transported into a ball grinding tank through a powder delivery pump, which has the advantages of strong uniformity, strong controllability, scalability, etc.

[0011] The present invention grinds the material by the steel balls in the ball mill, and grinds the material by centrifugal force and friction force, which can promote grain refinement, improve powder activity, evenly distribute particles and strengthen the interface bonding between the body and the matrix.

[0012] The present invention uses two completely symmetrical centrifugal drums to perform integrated washing and centrifugal operations. A pumping device and an automatic pH meter are provided to achieve automatic washing of powder materials. Compared with direct immersion and flushing, the use of centrifugal washing can effectively reduce the loss of ball-milled materials during the cleaning process.

[0013] The integrated preparation device for ball-milled ash-based materials proposed in the present invention is not only automatic and efficient and applicable to various ball-milled raw materials, but also the ball-milled materials prepared by the system have good stability, ball millability, interface bonding and adsorption capacity, and the equipment is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a flow chart of an integrated device for ball milling ash-based materials; Figure 2 It is a schematic diagram of a ball mill; Figure 3 is a schematic diagram of a centrifuge tank; Description of Reference Numerals In the figure, 1. material storage unit, 2. powder storage tank valve, 3. powder delivery pipeline, 4. powder delivery pump, 5. Powder delivery pipeline valve, 6. Liquid storage unit, 7. Liquid storage tank valve, 8. Liquid delivery pipeline, 9. Ball mill, 91. Ball mill feed port, 92. Delivery valve, 93. Delivery pipeline, 94. Ball mill, 95. Discharge port, 96. Discharge pipeline, 97. Delivery pump, 98. Discharge valve, 10. Centrifuge, 101. Centrifuge feed pipe, 102. Centrifuge feed pipeline valve, 103. Centrifuge delivery pump, 104. Cleaning liquid storage tank, 10 5. Infusion pipeline, 106. Infusion pipeline valve, 107. Automatic telescopic device, 108. Waste liquid storage tank, 109. Waste liquid infusion pipeline, 110. Waste liquid infusion pump, 111. Waste liquid infusion pipeline valve, 112. Automatic lifting device, 113. Intelligent pH detection system, 114. Centrifuge cylinder, 115. Centrifuge discharge pipeline, 116. Discharge delivery pump, 117. Centrifuge casing, 11. Dryer, 12. Heating wire, 13. Bellows.

[0015] The purpose and technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. It should be noted that the following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0016] See also Figure 1 , the embodiment of the present invention includes: An integrated preparation device for ball milled ash-based passivation materials includes a feeding system I, a ball milling system II, a washing centrifugal system III, and a drying system IV. The present invention designs an automatically controlled ball milling system and a washing centrifugal system to achieve the purpose of efficiently preparing fly ash-based passivation materials and automatically washing pH.

[0017] The feeding system includes a storage unit 1 and a feeding pipeline. For powdery materials, a powder delivery pipeline 3 is provided, and a powder delivery pump 4 is installed at the outlet of the pipeline. The valve 5 of the powder storage tank is opened, and the powder delivery pump 4 uses the dynamic pressure and static pressure of the air to transport the material particles in the closed pipeline along the airflow direction; for liquid materials, a liquid delivery pipeline 8 is provided for transportation. When the valve 7 of the liquid storage tank is opened, the liquid will be spontaneously transported along the pipeline under the action of gravity. The ball mill system includes a feed port 91, a ball mill tank 94, and a discharge port 95. The ball mill system is connected to the feeding system, and a feed port 91 is provided on the left side of the ball mill 9, and a discharge port 95 is provided on the right side.

[0018] The washing centrifugal system includes a centrifuge 10, a cleaning liquid storage tank 104, and a waste liquid storage tank 108. The cleaning liquid storage tank 104 is connected to two centrifugal cylinders 113 in the centrifuge through a liquid infusion tube 105. When the valve 106 of the cleaning liquid storage tank is opened, the liquid will be spontaneously transported along the pipeline under the action of gravity. Figure 3The centrifuge 10 is composed of two centrifugal cylinders 114, which provide a place for washing and centrifuging the materials. The centrifuge is also provided with waste liquid storage tanks 108 corresponding to the two centrifugal cylinders. The outlet pipe 109 is provided with an intelligent pH detection system 113 to sensitively measure the pH of the solution and more accurately control the progress of the reaction. A discharge port 115 is provided at the lower part of the centrifugal cylinder, and the discharge port is connected to the drying system through a delivery pump 116.

[0019] The drying system comprises a dryer 11 , and a feed port of the dryer 11 is connected to a centrifuge 10 . DETAILED DESCRIPTION

[0020] Taking fly ash as an example, the process of preparing ash-based passivation materials is as follows: In storage unit 1, fly ash is on the left, calcium hydroxide is in the middle, and potassium dihydrogen phosphate is on the right; Open the valve 5 of the powder delivery pipeline and the valve 7 of the liquid delivery pipeline, start the powder delivery pump 4, control the feeding system to add fly ash, calcium hydroxide, and potassium dihydrogen phosphate at a mass ratio of 8:1.1:1.4, and add deionized water according to the solid-liquid ratio of 1: (3-15) according to the total amount of the above solids, and put it into the ball mill 9, close the ball mill feed port 91, start the ball mill, and mill at a ball mill speed of 300-400rpm for 1-3 hours. Open the discharge port valve 98.

[0021] The automatic lifting device 107 drives the pipeline to the middle of the centrifugal drum. The ball-milled material is transported to the centrifugal drum 114 along the pipeline 96 under the action of the centrifugal pump 97. The cleaning liquid inlet valve 106 is opened, and the cleaning liquid enters the centrifugal drum. The automatic lifting device 107 retracts upward and leaves the centrifuge. The centrifugal device 10 is started. After the centrifugation is completed, the lifting device 112 drives the waste liquid outlet pipe (the waste liquid outlet pipe is equipped with a pH detection system 113) to the middle of the centrifugal drum 114. Under the action of the centrifugal pump, the waste liquid is extracted into the waste liquid storage tank along the pipeline. The pH is detected while the waste liquid is extracted. This process is repeated until the pH value displayed on the display screen of the automatic pH meter remains unchanged. The washing centrifugation is completed, the water outlet device 111 and the water inlet device 106 are closed, and the automatic lifting device retracts upward and leaves the centrifuge 10.

[0022] The bottom discharge port of the centrifuge is controlled by the controller / central control. The washed and centrifuged material enters the dryer 11 under the action of the centrifugal pump 116. The dryer is started and dried at 50°C for 6 hours to obtain the fly ash-based material. It should be noted that the bellows 13 is only opened in the early stage of drying to accelerate the separation of moisture. After the moisture is basically evaporated, the bellows is closed.

[0023] In addition, it should be noted that the above only expresses one implementation of the present application, and its description is relatively clear and detailed, but it cannot be understood as limiting the scope of the patent of the present application. It should be pointed out that any content that does not deviate from the technical solution of the present invention, or any simple modification, equivalent change modification, etc., are within the scope of the solution of the present invention.

Claims

1. An integrated preparation device for ball milled ash-based passivation materials, characterized in that: Including feeding system, ball milling system, washing centrifugal system and drying system; The feeding system includes a central console, a material storage unit, and a feeding pipeline; The ball milling system is connected to the feeding system, which includes a ball milling tank; The washing centrifugal system is connected to the ball milling system, and includes a centrifuge, a cleaning liquid storage tank, a waste liquid storage tank, a liquid infusion pipeline, a material discharge pipeline, and an automatic pH meter; The drying system is connected to the washing centrifugal system and comprises a feeding pipeline and a dryer.

2. The integrated preparation device for ball-milled ash-based passivation material according to claim 1, characterized in that: The feeding system comprises a fly ash providing unit, a calcium hydroxide providing unit, a potassium dihydrogen phosphate providing unit, and a deionized water providing unit.

3. The integrated preparation device for ball-milled ash-based passivation material according to claim 1, characterized in that: The feed pipeline includes a liquid delivery pipeline and a powder delivery pipeline; The end of the powder delivery pipeline is connected to a powder delivery pump, and the discharge port at the lower end of the powder delivery pump and the water outlet of the liquid delivery pipeline are both directly opposite to the feed port of the ball mill.

4. The integrated preparation device for ball-milled ash-based passivation material according to claim 1, characterized in that: The washing centrifugal system includes a water adding device, a water pumping device, a centrifugal device, an intelligent pH detection system, a feed inlet, and a discharge port; The washing centrifugal system is composed of two closed inner and outer layers of containers, with two symmetrically placed centrifugal cylinders inside. The washing centrifugal system has a feed inlet at the upper end and a discharge outlet at the lower end, both of which are equipped with valve controls, and a powder delivery pump at the lower end; The water adding device is located outside the shell of the washing centrifugal system, and is composed of a water delivery pipeline, a valve, and a water storage tank, and is connected to the powder delivery pipeline and connected to the feed port for delivery; The pumping devices are located at the upper ends of the two centrifuges and consist of a valve and a water storage tank; The feed pipe and the water pumping pipe at the upper end of the washing centrifuge system are both connected with an automatic telescopic shell to control the expansion and contraction of the pipe before and after the centrifugation process; The intelligent pH detection system is located on the outer walls of the two pumping pipes respectively. When the cleaning is completed and the drainage is completed, the intelligent pH detection system automatically detects the pH of the solution and displays a centrifuge interface on the display screen (not shown in the figure) for confirmation of subsequent steps.

5. The integrated preparation device for ball-milled ash-based passivation material according to claim 1, characterized in that: The feed pipeline includes a powder delivery pipeline and a water delivery pipeline, both of which are controlled by valves and delivery pumps; The feed pipelines are all provided with valve controls, and a powder delivery pump is provided to connect the powder delivery pipeline and the feed port.

6. The integrated preparation device for ball-milled ash-based passivation material according to claim 1, characterized in that: The drying system comprises a drying device and an air drying device: the drying device is divided into an inner capsule and an outer layer, the outer layer is embedded with a heating wire, and the inner capsule wall is embedded with a fan, so as to jointly dry the material.

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