Evaporative crystallization device for treating steel dust sludge filtrate

Abstract

The utility model relates to the technical field of evaporative crystallization devices, and discloses an evaporative crystallization device for treating steel dust sludge filtrate, which comprises an evaporation barrel and a crystallization mechanism. And the evaporation barrel is heated to evaporate the filtrate solvent to obtain a saturated or nearly saturated solution. The devitrification mechanism comprises a rotary driving part, a plurality of devitrification plates and a heat preservation box, the rotary driving part drives the devitrification plates to rotate, so that the hot saturated solution is rapidly crystallized on the devitrification plates, and crystals fall into the material storage box after being scraped by the material scraping plate. The device adopts a mode of firstly evaporating and then dispersedly heating and crystallizing, is high in crystallization speed and high in treatment efficiency, and can avoid blockage of the discharge hole. And the rotary driving piece performs intermittent driving, so that the solution is conveniently and accurately dripped. The surface of the devitrification plate is provided with an arc-shaped groove, and the scraping plate is an elastic scraping plate, so that crystals can be better scraped. The material storage box is slidably connected with the heat preservation box, and replacement and material taking are convenient. And a steam exhaust pipe on the evaporation barrel can be used for recycling waste heat.

Description

Technical Field

[0001] The utility model relates to the technical field of evaporation crystallization devices, in particular to an evaporation crystallization device for treating steel dust sludge filtrate. Background Art

[0002] Steel dust sludge filtrate treatment refers to the process of treating the filtrate obtained after filtering the dust sludge generated in the steel production process. These filtrates may contain various harmful substances, such as heavy metals, organic matter, etc. If they are directly discharged into the environment, they will cause serious pollution to the environment.

[0003] Evaporative crystallization is a common wastewater treatment method. It heats the filtrate to evaporate the water, increasing the solute concentration and ultimately achieving crystallization. In the treatment of steel dust sludge filtrate, evaporative crystallization can effectively remove harmful substances from the filtrate while recovering useful substances such as metal salts.

[0004] According to the "Evaporation Crystallization Device" proposed in CN118179077A, the evaporation crystallization device includes a cylindrical body with an evaporation chamber, a feed port connected to the evaporation chamber is provided at the top of the evaporation chamber, and a discharge port connected to the evaporation chamber is provided at the bottom. A circulation mechanism is provided to guide the steam at the top of the evaporation chamber to the bottom of the evaporation chamber through a steam discharge pipe, thereby utilizing the residual heat of the steam.

[0005] However, when discharging crystallization, the cylinder of the above-mentioned evaporation crystallization device needs to close the feed port, causing the equipment to stop working. After the evaporation crystallization of the steel dust sludge filtrate, the crystals at the bottom of the cylinder are squeezed and agglomerated. In addition, the discharge port is narrower than the cylinder, making it difficult to discharge the crystals, resulting in blockage of the bottom discharge port, which affects the efficiency of the evaporation crystallization process.

[0006] Therefore, we propose an evaporation crystallization device for treating steel dust sludge filtrate to solve the problems in the above background. Utility Model Content

[0007] The purpose of the utility model is to provide an evaporation crystallization device for treating steel dust sludge filtrate, so as to solve the problem of difficulty in discharging materials from the cylinder of the existing evaporation crystallization device mentioned in the background art, resulting in low efficiency.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0009] An evaporation crystallization device for treating steel dust sludge filtrate comprises an evaporation barrel and a crystallization mechanism. The evaporation barrel is fixedly connected to a support platform on the outside. A feed pipe and a discharge pipe are connected to the evaporation barrel. An electromagnetic switch valve is installed on the discharge pipe. The device is characterized in that a multi-head nozzle is provided at the outlet end of the discharge pipe.

[0010] The crystallization mechanism includes a rotating drive member, a plurality of crystallization plates connected to the rotating drive member, and an insulation box arranged outside the crystallization plates. A scraper plate is fixedly connected to the insulation box. The insulation box is provided with a discharge port below the scraper plate, a storage box is provided below the discharge port, and the multi-head nozzle is arranged inside the insulation box.

[0011] The rotary driving member is provided with a base fixedly connected to the ground.

[0012] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0013] The utility model heats and evaporates the steel dust sludge filtrate in the evaporation barrel to form a saturated or nearly saturated solution. The saturated solution enters the multi-head nozzle through the discharge pipe and drips evenly and dispersedly onto the rotating crystallization plate. The electric heating device heats the crystallization plate to make the solution crystallize quickly. The rotary driving part drives the crystallization plate to rotate. When the crystallization plate passes through the scraper plate, the crystals are scraped off and fall into the storage box. When the crystals in the storage box accumulate to a certain level, the storage box can be slid and separated from the insulation box by a handle, which is convenient for replacement and material removal. The method of evaporation first and then dispersed heating crystallization is adopted to increase the crystallization speed of the steel dust sludge filtrate, thereby improving the processing efficiency. By performing crystallization on the crystallization plate and using the scraper plate to scrape the crystals for discharging, the problem of clogging of the evaporation chamber discharge port due to crystallization is avoided, and smooth discharging is ensured. During the crystallization process, impurities will remain in the solution, while the crystals are relatively pure, thereby improving the purity of the product. The intermittent drive of the rotary driving part and the replaceable design of the storage box enable the device to continuously perform crystallization and discharging, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall cross-sectional structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the overall external structure of the utility model;

[0016] Figure 3 This is a schematic diagram of the connection structure between the electric heating device and the crystallization plate of the utility model;

[0017] Figure 4 This is a schematic diagram of the bottom structure of the thermal insulation box of the present invention.

[0018] Among them: 1. Evaporation barrel; 101. Support platform; 102. Feed pipe; 103. Discharge pipe; 104. Solenoid switch valve; 105. Multi-head nozzle; 2. Crystallization mechanism; 201. Rotating drive component; 202. Crystallization plate; 203. Insulation box; 204. Scraper plate; 205. Discharge port; 206. Storage box; 207. Base; 208. Electric heating device; 209. Arc groove; 210. Drive motor; 211. Rotating disk; 212. Conductive slip ring; 213. Rotating groove; 214. Handle. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] Example 1:

[0021] See also Figure 1-4 , the utility model provides a technical solution:

[0022] An evaporation crystallization device for treating steel dust sludge filtrate includes an evaporation barrel 1 and a crystallization mechanism 2. The evaporation barrel 1 is fixedly connected to a support platform 101 on the outside. A feed pipe 102 and a discharge pipe 103 are connected to the evaporation barrel 1. The discharge pipe 103 is installed with an electromagnetic switch valve 104 for controlling the flow rate and opening of the discharge pipe 103. The outlet end of the discharge pipe 103 is provided with a multi-head nozzle 105.

[0023] The crystallization mechanism 2 includes a rotary drive member 201, a plurality of crystallization plates 202 connected to the rotary drive member 201, and a heat preservation box 203 disposed outside the crystallization plates 202. A scraper plate 204 is fixedly connected to the heat preservation box 203. A discharge port 205 is provided on the heat preservation box 203 and is located below the scraper plate 204. A storage box 206 is provided below the discharge port 205.

[0024] The rotary drive member 201 is provided with a base 207 fixedly connected to the ground. The crystallization plate 202 is a heat-conducting metal plate coated with a wear-resistant layer and internally installed with an electric heating device 208. The evaporation barrel 1 heats the steel dust sludge filtrate inside, evaporating the solvent in the filtrate to obtain a saturated or nearly saturated steel dust sludge filtrate solution.

[0025] Furthermore, a multi-head nozzle 105 is disposed inside the heat preservation box 203. The flow of the discharge pipe 103 is controlled by the electromagnetic switch valve 104, so that the saturated solution of the steel dust sludge filtrate flows through the multi-head nozzle 105 to the crystallization plate 202. The multi-head nozzle 105 evenly disperses the hot saturated steel dust sludge filtrate onto the crystallization plate 202.

[0026] At the same time, the electric heating device 208 heats the crystallization plate 202. The high temperature of the crystallization plate 202 causes the hot, saturated steel dust sludge filtrate on its surface to crystallize rapidly. This mechanism uses a method of first evaporating and then distributing heating and crystallizing to accelerate the crystallization of the steel dust sludge filtrate and improve the processing speed.

[0027] Furthermore, the rotating drive member 201 drives multiple crystallization plates 202 to rotate inside the annular insulation box 203. When the rotating crystallization plates 202 pass through the scraper plate 204 inside the insulation box 203, the crystals thereon are scraped off and fall into the storage box 206, and then enter the bottom of the multi-head nozzle 105 again, drip into the saturated solution of the steel dust sludge filtrate, and continue to heat and crystallize; thereby achieving rapid processing of the steel dust sludge filtrate. This structure performs crystallization on the crystallization plate 202 and discharges the material by scraping it through the scraper plate 204, and there will be no problem of the evaporation chamber discharge port 205 being blocked due to crystallization, resulting in discharge difficulties.

[0028] Furthermore, an arc groove 209 is provided on the upper surface of the crystallization plate 202, and the scraper plate 204 is an elastic scraper so that it can fit in the arc groove 209 on the crystallization plate 202, which is conducive to scraping off the precipitated crystals;

[0029] The rotating drive component 201 includes a driving motor 210, a rotating disk 211, and a conductive slip ring 212. The driving motor 210 drives the rotating disk 211 to rotate. The conductive slip ring 212 is installed on the driving shaft of the driving motor 210. The insulation box 203 is annular and has a rotating groove 213 on the inside. The rotating disk 211 is connected to the rotating groove 213 of the insulation box 203 to form a tight rotating connection, allowing the driving motor 210 to drive the crystallization plate 202 to rotate inside the insulation box 203 through the rotating disk 211, while reducing the heat loss inside the insulation box 203.

[0030] Preferably, the rotary drive member 201 is intermittently driven, and the drive motor 210 is a stepping motor. When the crystallization plate 202 moves below the multi-head nozzle 105, the rotation is suspended, which is conducive to the multi-head nozzle 105 accurately dropping the saturated steel dust sludge filtrate onto the crystallization plate 202.

[0031] Preferably, the storage box 206 is slidably connected to the insulation box 203 at the junction, and a handle 214 is provided on the side of the storage box 206. The storage box 206 and the insulation box 203 are slidably separated by pulling the handle 214, which facilitates the replacement of the storage box 206 and the convenience of taking out materials.

[0032] Furthermore, a steam exhaust pipe is installed on the evaporation barrel 1 for exhausting the evaporation barrel 1. The waste heat can be further recovered and utilized by transporting the steam to the exhaust pipe.

[0033] The working principle of the evaporation crystallization device is as follows:

[0034] The steel dust sludge filtrate is introduced into the evaporation drum 1 through the feed pipe 102. The evaporation drum 1 heats the filtrate to evaporate the solvent, obtaining a saturated or nearly saturated steel dust sludge filtrate solution. The electromagnetic on-off valve 104 is opened to allow the saturated solution to pass through the discharge pipe 103 and enter the multi-head nozzle 105. The multi-head nozzle 105 evenly distributes the hot saturated solution onto the crystallization plate 202. The electric heating device 208 heats the crystallization plate 202, causing the hot saturated solution on the surface of the crystallization plate 202 to rapidly crystallize. The rotary drive member 201 drives the crystallization plate 202 to rotate within the insulation box 203. When the crystallization plate 202 passes the scraper plate 204, the crystals are scraped off and fall into the storage bin 206. The crystallization plate 202 continues to rotate and enters the bottom of the multi-head nozzle 105 again, dripping the saturated solution. Heating and crystallization continue. The above process is repeated to achieve rapid processing of the steel dust sludge filtrate and improve the efficiency of evaporation and crystallization. Although specific embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit thereof, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An evaporation crystallization device for treating steel dust sludge filtrate, comprising an evaporation barrel (1) and a crystallization mechanism (2), wherein the evaporation barrel (1) is fixedly connected to a support platform (101) on the outside, the evaporation barrel (1) is connected to a feed pipe (102) and a discharge pipe (103), and the discharge pipe (103) is installed with an electromagnetic switch valve (104), characterized in that: The outlet end of the discharge pipe (103) is provided with a multi-head nozzle (105); The crystallization mechanism (2) comprises a rotary drive member (201), a plurality of crystallization plates (202) connected to the rotary drive member (201), and a heat preservation box (203) arranged outside the crystallization plates (202); a scraper plate (204) is fixedly connected to the interior of the heat preservation box (203); a discharge port (205) is provided on the heat preservation box (203); the discharge port (205) is located below the scraper plate (204); a storage box (206) is provided below the discharge port (205); and the multi-head nozzle (105) is arranged inside the heat preservation box (203); The rotary drive member (201) is provided with a base (207) fixedly connected to the ground.

2. The evaporation crystallization device for treating steel dust sludge filtrate according to claim 1, characterized in that: The crystallization plate (202) is a heat-conducting metal plate with a wear-resistant layer coated on its surface, and an electric heating device (208) is installed inside it.

3. The evaporation crystallization device for treating steel dust sludge filtrate according to claim 1, characterized in that: The rotary driving member (201) intermittently drives the plurality of crystallization plates (202) to rotate.

4. The evaporation crystallization device for treating steel dust sludge filtrate according to claim 3, characterized in that: The upper surface of the crystallization plate (202) is provided with an arc groove (209), and the scraper plate (204) is an elastic scraper to cooperate with the arc groove (209) on the crystallization plate (202).

5. The evaporation crystallization device for treating steel dust sludge filtrate according to claim 4, characterized in that: The rotary drive member (201) comprises a drive motor (210), a rotating disk (211) fixedly connected to the crystallization plate (202), and a conductive slip ring (212). The drive motor (210) drives the rotating disk (211) to rotate, and the conductive slip ring (212) is installed on the drive shaft of the drive motor (210).

6. The evaporation crystallization device for treating steel dust sludge filtrate according to claim 5, characterized in that: The heat preservation box (203) is annular and has a rotating groove (213) on the inner side. The rotating disk (211) is rotatably connected to the rotating groove (213) of the heat preservation box (203). The edge of the rotating disk (211) 211 is in contact with the inner wall of the rotating groove (213) 213.

7. The evaporation crystallization device for treating steel dust sludge filtrate according to claim 1, characterized in that: The material storage box (206) is slidably connected to the heat preservation box (203), and a handle (214) is provided on the side of the material storage box (206).

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