Secondary precipitation sewage pool for metallographic sample preparation

Abstract

The utility model discloses a secondary sedimentation sewage pool for metallographic sample preparation, which belongs to the technical field of metallographic sample preparation wastewater treatment devices and comprises a sewage pool divided into a first treatment area and a second treatment area by a vertical steel plate. A water inlet is formed in the upper part of the tank wall of the first treatment area; a guide plate is arranged at the top end of the vertical steel plate and extends from the vertical steel plate to the first treatment area, and an inclination angle of 120 degrees is formed between the guide plate and the vertical steel plate; a water outlet is formed in the upper part of the tank wall of the second treatment area, the height of the water outlet is smaller than or equal to that of the guide plate, and a dustproof net is mounted at the water outlet; the device is simple in structure, low in manufacturing cost, stable and reliable in operation, convenient to maintain and good in treatment effect, and is particularly suitable for treatment requirements of metallographic sample preparation wastewater; the technical problems that existing metallographic sample preparation wastewater treatment equipment is large in water flow disturbance, poor in precipitation effect, low in treatment efficiency and the like are effectively solved, and the stable and efficient sewage treatment effect is achieved.

Description

Technical Field

[0001] This utility model belongs to the technical field of metallographic sample preparation wastewater treatment device, and particularly relates to a secondary sedimentation wastewater tank for metallographic sample preparation. Background Technology

[0002] Metallographic sample preparation is a crucial step in materials research and quality testing, primarily used to observe and analyze the microstructure of metallic materials. The metallographic sample preparation process involves cutting, grinding, and polishing the metal samples. These processes generate wastewater containing contaminants such as metal particles and iron filings. Direct discharge of this wastewater without treatment would cause environmental pollution; therefore, specialized wastewater treatment equipment is necessary.

[0003] Currently, sedimentation is the main method used to treat metallographic sample preparation wastewater. Solid particles in the wastewater settle and separate in a wastewater tank due to gravity. A common sedimentation tank structure consists of several baffles within the tank, dividing the wastewater tank into multiple treatment zones. Solid-liquid separation is achieved by utilizing the flow of wastewater between these zones.

[0004] However, the existing technical solutions still have the following technical problems: First, the internal water flow direction of the sedimentation tank lacks an effective guiding design, and the wastewater is prone to turbulence during the flow process, causing the settled solid particles to be rolled up again; second, the connection structure between the treatment zones is not reasonable enough, and a stable hydraulic circulation system cannot be formed, which affects the sedimentation effect; third, the effective sedimentation space in the sedimentation zone is not fully utilized, which reduces the wastewater treatment efficiency.

[0005] Chinese utility model patent (201520267786.3) discloses a sedimentation tank for cooling water in steel rolling production, which uses gravity to separate cooling water at different levels. This sedimentation tank includes multiple components such as impact-resistant plates, baffles, inclined plates, and agitators, which not only increases manufacturing difficulty and cost but also raises the equipment's failure rate.

[0006] In response, this utility model provides a sewage sedimentation tank with a simple structure and good treatment effect. Utility Model Content

[0007] The purpose of this invention is to provide a metallographic sample preparation secondary sedimentation wastewater tank to solve the technical problem mentioned in the background art of how to achieve stable water flow guidance and efficient solid-liquid separation through simple structural design, and avoid the secondary rolling up of the precipitated matter.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A metallographic sample preparation secondary sedimentation wastewater tank includes a wastewater tank, which is divided into a first treatment zone and a second treatment zone by a vertical steel plate; an inlet is provided on the upper part of the tank wall of the first treatment zone; a guide plate is provided at the top of the vertical steel plate, the guide plate extends from the vertical steel plate toward the first treatment zone and forms a 120-degree inclination angle with the vertical steel plate; an outlet is provided on the upper part of the tank wall of the second treatment zone, the height of the outlet is less than or equal to the height of the guide plate, and a dustproof net is installed on the outlet.

[0010] Preferably, the height of the vertical steel plate is 2 / 3 of the height of the sewage tank, which ensures sufficient sedimentation space while leaving space at the top for water flow to avoid short-circuiting and allow the sewage to settle fully.

[0011] Preferably, the vertical steel plate is made of 3mm thick stainless steel sheet, and the vertical steel plate is fixed in the sewage tank by welding; this ensures that the steel plate has sufficient strength to withstand water pressure, the stainless steel material is corrosion resistant, and the welding fixation ensures stability and sealing.

[0012] Preferably, the guide plate is made of 2mm thick stainless steel plate, and the width of the guide plate is the same as that of the sewage tank; this ensures that the guide plate has sufficient strength while reducing weight, and the fact that it is the same width as the sewage tank can prevent water from flowing around the sides and ensure the guiding effect.

[0013] Preferably, the guide plate extends obliquely from the vertical steel plate toward the first treatment zone, and the projected length of the extension section on the horizontal plane is 100mm; a reasonable extension length can effectively guide the water flow downward, increase the sedimentation effect, and at the same time, it will not excessively obstruct the water flow.

[0014] Preferably, the guide plate is fixed to the vertical steel plate by welding, and all welds are ground smooth; this ensures a firm connection, and the smoothness reduces water flow disturbance and avoids turbulence.

[0015] Preferably, the height of the water inlet is the same as the height of the guide plate, and the water inlet is inclined downward at 30 degrees to the horizontal plane; so that the water inlet and the guide plate cooperate to enhance the downward guiding effect of the water flow.

[0016] Preferably, the height of the water outlet is the same as the height of the guide plate; this ensures that the upper layer of clean water flows out from a suitable height, avoiding the carrying away of bottom sediment.

[0017] Preferably, the dustproof net is made of nylon mesh with a pore size of 0.3mm, which can filter out residual fine particles and further purify the water.

[0018] Preferably, the volume ratio of the first treatment zone to the second treatment zone is 2:3; this ensures sufficient sedimentation time and treatment effect.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] This utility model provides a secondary sedimentation wastewater tank for metallographic sample preparation, which effectively solves the technical problems of large water flow disturbance, poor sedimentation effect and low treatment efficiency in existing metallographic sample preparation wastewater treatment equipment, and achieves stable and efficient wastewater treatment effect.

[0021] Specifically, this utility model achieves the corresponding technical effects through the following technical means: First, by setting a 30-degree inclined inlet and a 120-degree inclined guide plate, a reasonable water flow guiding system is formed, effectively reducing water flow disturbance and preventing settled matter from being rolled up again; second, by setting the height of the vertical steel plate to 2 / 3 of the tank height and adopting a reasonable treatment zone volume ratio, sufficient sedimentation space is ensured while avoiding short-circuiting, thus improving sedimentation efficiency; third, by setting an outlet at the same height as the guide plate in the second treatment zone and equipping it with a 0.3mm aperture dustproof net, the stability of the effluent water quality is ensured. Furthermore, the use of stainless steel material and the implementation of welding, weld grinding, and other processes ensure the structural strength and service life of the equipment.

[0022] Overall, this utility model has a simple structure, low manufacturing cost, stable and reliable operation, convenient maintenance, and good treatment effect, making it particularly suitable for the treatment needs of metallographic sample preparation wastewater. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of a preferred embodiment of the present invention;

[0024] In the diagram: 1. Vertical steel plate; 2. First treatment zone; 3. Second treatment zone; 4. Inlet; 5. Guide plate; 6. Outlet. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0026] like Figure 1 As shown:

[0027] A metallographic sample preparation secondary sedimentation wastewater tank includes a tank body, which is divided into a first treatment zone 2 and a second treatment zone 3 by a vertical steel plate 1. The height of the vertical steel plate 1 is 2 / 3 of the height of the wastewater tank, and the vertical steel plate 1 is made of 3mm thick stainless steel sheet and is fixed inside the wastewater tank by welding. An inlet 4 is set at 2 / 3 of the height of the tank wall in the first treatment zone 2; the inlet 4 is inclined downward at 30 degrees to the horizontal plane to ensure smooth flow of wastewater and good cooperation with the guide plate 5 to reduce disturbance to the water in the tank.

[0028] A guide plate 5 is installed at the top of the vertical steel plate 1, forming a 120-degree angle with the vertical steel plate 1. The guide plate 5 is made of 2mm thick stainless steel plate, with the same width as the sewage tank, and extends 100mm (horizontal distance) from the vertical steel plate 1 towards the first treatment zone 2. The guide plate 5 is fixed to the vertical steel plate 1 by welding, and all welds are ground smooth to ensure smooth water flow, and the surface is treated with anti-corrosion.

[0029] When the water level in the first treatment zone 2 rises to the height of the guide plate 5, the water body exerts a supporting force on the guide plate 5, reducing the pressure on the guide plate 5. Simultaneously, this structure ensures that only the clearer water from the upper layer of the first treatment zone 2 flows smoothly into the second treatment zone 3 along the inclined surface, while the bottom sludge is not carried in. The guiding effect of the guide plate 5 avoids disturbance caused by direct water flow impact, which is beneficial to the sedimentation effect in the second treatment zone 3.

[0030] An outlet 6 is located at 2 / 3 of the height of the pool wall in the second treatment zone 3, and a dustproof net is installed at the outlet 6. The dustproof net is made of nylon mesh with a pore size of 0.3mm, which can effectively filter residual impurities.

[0031] Water flows slowly from the first treatment zone 2, guided by the guide plate 5, into the second treatment zone 3. As the water slowly rises, suspended solids and sludge gradually settle to the bottom under gravity. When the water level reaches the outlet 6, the fully settled upper layer of clear water overflows naturally from the outlet 6. The nylon mesh at the outlet 6 further intercepts fine suspended solids, ensuring the quality of the effluent. Sludge continues to settle at the bottom, forming a stable hydraulic circulation system that guarantees the effectiveness of wastewater treatment.

[0032] The upper third of the wastewater tank serves as a buffer zone to cope with fluctuations in water volume, while the middle and lower two-thirds are used for sludge settling and storage. This allocation ratio achieves the optimal balance between wastewater treatment efficiency and sludge storage capacity.

[0033] In this embodiment, the dimensions of the sewage tank are: 700mm long, 600mm wide, and 500mm high; the volume ratio of the first treatment zone 2 to the second treatment zone 3 is 2:3; actual usage results show that the effluent is clear and the iron filings removal rate is over 95%.

[0034] Working principle:

[0035] First, wastewater containing iron filings flows in through inlet 4, located at two-thirds of the height of the wall in the first treatment zone 2. The 30-degree inclination angle of inlet 4 is designed based on fluid dynamics principles, creating a suitable tangential velocity in the water flow, which reduces impact force while promoting the initial separation of particulate matter. This design prevents the already settled sludge from being disturbed, maintaining the stability of the water in the tank.

[0036] When wastewater enters the first treatment zone 2, it begins to settle and separate under the influence of gravity. According to Stokes' Law, the settling velocity of particles is directly proportional to their density and the square of their diameter, and inversely proportional to the fluid viscosity. Larger, heavier iron filings will preferentially settle to the bottom of the tank. The lower two-thirds of the space in the first treatment zone 2 is dedicated to the settling and storage of these larger particles, providing ample settling time and space.

[0037] As the water level rises to the height of the guide plate 5, the relatively clean water in the upper layer flows along the guide plate 5, which is inclined at a 120-degree angle to the vertical steel plate 1, towards the second treatment zone 3. This special inclination design maintains a laminar flow and avoids turbulence. The width of the guide plate 5 is the same as that of the sewage tank; this ensures sufficient strength while reducing weight, and the same width as the sewage tank prevents water from flowing around the sides, ensuring the guiding effect. At the same time, the inclined surface of the guide plate 5 generates a downward component force, further promoting the sedimentation of fine particles. Larger particles at the bottom will remain in the first treatment zone 2 due to gravity. The projected length of the extended section of the guide plate 5 on the horizontal plane is 100mm; this reasonable extension length effectively guides the water flow downward, increasing the sedimentation effect without excessively obstructing the water flow.

[0038] After the water flows into the second treatment zone 3, the cross-sectional area of ​​the zone increases due to the 2:3 volume ratio of the first treatment zone 2 to the second treatment zone 3, resulting in a significant decrease in water velocity. This reduced velocity facilitates the settling of remaining fine particles under gravity. The second treatment zone 3 provides a longer residence time, ensuring more thorough sedimentation and separation. As the water slowly rises, the remaining suspended solids gradually settle to the bottom of the tank.

[0039] Finally, the thoroughly settled water rises to the outlet at two-thirds of the height of the wall in the second treatment zone 3. A 0.3mm nylon mesh installed at outlet 6 performs final filtration, intercepting any remaining fine suspended solids. This design, based on density stratification, ensures that only the upper layer of clarified water flows out from outlet 6.

[0040] The entire wastewater treatment tank forms a stable hydraulic circulation system. The upper one-third of the space serves as a buffer for water flow regulation, capable of handling fluctuations in influent volume; the lower two-thirds of the space is used for sludge settling and storage. This space allocation ratio achieves an optimal balance between treatment efficiency and storage capacity. The treatment effect of the wastewater treatment tank is affected by several factors, including water temperature (affecting water viscosity), water flow velocity, particle characteristics, and the residence time of wastewater within the tank.

[0041] This design fully utilizes the principle of gravity settling and combines it with a rational structural design to achieve efficient solid-liquid separation. The entire process requires no external power, operates stably and reliably, and is simple to maintain, making it particularly suitable for treating iron-containing wastewater generated during metallographic sample preparation.

[0042] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A metallographic sample preparation secondary sedimentation wastewater tank, comprising a wastewater tank, characterized in that, The sewage tank is divided into a first treatment zone (2) and a second treatment zone (3) by a vertical steel plate (1); an inlet (4) is provided on the upper part of the tank wall of the first treatment zone (2); a guide plate (5) is provided at the top of the vertical steel plate (1), the guide plate (5) extends from the vertical steel plate (1) toward the first treatment zone (2) and forms a 120-degree inclination angle with the vertical steel plate (1); an outlet (6) is provided on the upper part of the tank wall of the second treatment zone (3), the height of the outlet (6) is less than or equal to the height of the guide plate (5), and a dustproof net is installed on the outlet (6).

2. The secondary sedimentation wastewater tank for metallographic sample preparation according to claim 1, characterized in that, The height of the vertical steel plate (1) is 2 / 3 of the height of the sewage tank.

3. The secondary sedimentation wastewater tank for metallographic sample preparation according to claim 2, characterized in that, The vertical steel plate (1) is made of 3mm thick stainless steel plate and is fixed in the sewage tank by welding.

4. The secondary sedimentation wastewater tank for metallographic sample preparation according to claim 1, characterized in that, The guide plate (5) is made of 2mm thick stainless steel plate, and the width of the guide plate (5) is the same as that of the sewage tank.

5. The metallographic sample preparation secondary sedimentation wastewater tank according to claim 1, characterized in that, The guide plate (5) extends obliquely from the vertical steel plate (1) toward the first processing area (2), and the projection length of the extension section on the horizontal plane is 100mm.

6. The secondary sedimentation wastewater tank for metallographic sample preparation according to claim 1, characterized in that, The guide plate (5) is fixed to the vertical steel plate (1) by welding, and all welds are ground smooth.

7. The metallographic sample preparation secondary sedimentation wastewater tank according to claim 1, characterized in that, The height of the inlet (4) is the same as the height of the guide plate (5), and the inlet (4) is inclined downward at 30 degrees to the horizontal plane.

8. The metallographic sample preparation secondary sedimentation wastewater tank according to claim 1, characterized in that, The height of the outlet (6) is the same as the height of the guide plate (5).

9. The secondary sedimentation wastewater tank for metallographic sample preparation according to claim 1, characterized in that, The dustproof net is made of nylon mesh with a pore size of 0.3mm.

10. The secondary sedimentation wastewater tank for metallographic sample preparation according to claim 1, characterized in that, The volume ratio of the first processing area (2) to the second processing area (3) is 2:3.

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