A method for recycling electroplating grinding wastewater

Abstract

The invention relates to the technical field of electroplating grinding wastewater recovery, and discloses a method for recovering and treating electroplating grinding wastewater, comprising: arranging a diverter perpendicular to the conveying direction of the conveyor belt on a conveyor belt, the diverter being used to evenly divide the sludge to be treated into a plurality of strips of sludge; forming all the strips of sludge formed by the diverter into sludge groups, wherein the sludge groups corresponding to the first number, the second number...the nth number of strips of sludge are respectively recorded as the first sludge group, the second sludge group...the nth sludge group; squeezing and dehydrating the sludge groups; executing an overflow judgment strategy to determine whether the sludge group is a candidate sludge group; obtaining a candidate sludge group with the lowest water content and recording it as a target sludge group; obtaining a mud cake corresponding to the target sludge group and recording it as a target mud cake; executing a pressure replenishment strategy to add a roller for pressure replenishment when the sludge to be treated is squeezed and dehydrated; performing targeted pressure replenishment to optimize the squeezing effect and reduce residual moisture.

Description

Technical Field

[0001] The present invention relates to the technical field of electroplating grinding wastewater recovery, and in particular to a method for recovering and treating electroplating grinding wastewater. Background Art

[0002] Wastewater generated during electroplating and grinding processes often contains significant amounts of heavy metals and other hazardous substances. Direct discharge of this wastewater without treatment can cause serious environmental pollution. To address this issue, precipitation is often used to convert metal ions in the wastewater into solid sludge for further treatment. Precipitation involves adding chemical reagents, such as pH adjusters and flocculants, to induce the metal ions dissolved in the wastewater to form larger particles and settle. Subsequently, the sludge requires dewatering through compression to reduce its volume and weight for easier transportation and subsequent disposal. Dewatering through compression is a critical step, using mechanical pressure to squeeze out as much water as possible from the sludge, thereby reducing its moisture content. This process not only impacts treatment efficiency but also affects costs and environmental safety. Therefore, developing efficient dewatering technologies and equipment, as well as optimizing operational procedures, has become a key research direction in the field of electroplating and grinding wastewater treatment. Proper dewatering technology can significantly improve sludge treatment efficiency and environmental safety, and is a key step in achieving zero wastewater discharge and resource utilization.

[0003] The existing sludge squeezing and dehydration process is to first divide the sludge into several strips to facilitate subsequent uniform squeezing and dehydration. Due to the shape of the strips, the sludge will inevitably stretch during squeezing. There is stretched sludge between adjacent strips of sludge, but the stretched sludge can never achieve the same dehydration effect as the center of the strips.

[0004] This solution proposes to squeeze and dehydrate the sludge group, implement an overflow judgment strategy, obtain a candidate sludge group, obtain the candidate sludge group with the lowest moisture content to obtain a target sludge group, implement a pressure replenishment strategy, and add rollers to replenish pressure when squeezing and dehydrating the sludge to be treated. Summary of the Invention

[0005] The present invention provides a method for recycling and treating electroplating grinding wastewater, which is used to promote the solution of the problems mentioned in the above background technology.

[0006] The present invention provides the following technical solution: a method for recycling and treating electroplating grinding wastewater, comprising:

[0007] Obtain wastewater after electroplating and grinding;

[0008] Adding pH regulators and flocculants to wastewater causes all metal ions to precipitate into sludge;

[0009] Collect the settled sludge and record it as sludge to be treated;

[0010] A plurality of diverters perpendicular to the conveying direction of the conveyor belt are arranged on the conveyor belt, and the diverters are used to evenly divide the sludge to be treated into a plurality of strips of sludge;

[0011] Different diverters are used to divide the sludge to be processed on the conveyor belt into different numbers of strips of sludge;

[0012] The width and height of the strips of sludge divided by different diverters are equal;

[0013] In the strips of sludge formed by different diverters, the intervals between two adjacent strips of sludge are different;

[0014] The number of strips of sludge formed by different diverters is recorded as the first number, the second number, and so on, the nth number in descending order;

[0015] All the strips of sludge formed by the diverter are divided into sludge groups, wherein the sludge groups corresponding to the first number, the second number, ... the nth number of strips of sludge are respectively recorded as the first sludge group, the second sludge group, ... the nth sludge group;

[0016] For each sludge group:

[0017] Squeeze and dewater the sludge group;

[0018] Execute the overflow determination strategy to determine whether the sludge group is a candidate sludge group;

[0019] The moisture content determination strategy is performed on the mud cake after squeezing and dehydration of each candidate sludge group, and each candidate sludge group corresponds to a moisture content;

[0020] The candidate sludge group with the lowest moisture content is recorded as the target sludge group;

[0021] Obtain the mud cake corresponding to the target sludge group, which is recorded as the target mud cake;

[0022] Implement the pressure replenishment strategy and add rollers to replenish pressure when squeezing and dehydrating the sludge to be treated.

[0023] Optionally, executing the overflow determination strategy includes:

[0024] When the sludge group is squeezed and dehydrated,

[0025] Determine whether sludge overflows from both sides of the conveyor belt;

[0026] The sludge group without sludge overflowing from both sides of the conveyor belt is recorded as the candidate sludge group.

[0027] Optionally, the squeezing and dehydrating of the sludge group includes:

[0028] A pressing plate is provided for pressing and dewatering the sludge group, wherein the pressing plate is rectangular in shape;

[0029] Get the area on the conveyor belt where squeezing and dehydration is performed, and record it as the squeezing area;

[0030] Get the length of the pressing area and record it as the pressing length;

[0031] Get the width of the pressing area, and record it as the pressing width;

[0032] The width of the press plate is equal to the press width, and the length of the press plate is equal to the press length;

[0033] The press board is parallel to the conveyor belt and is located on top of the conveyor belt;

[0034] Obtain two widths of the press plate, wherein the width close to the diverter is recorded as the first side;

[0035] A guide plate is provided for guiding the sludge group, wherein the guide plate is rectangular in shape;

[0036] The width of the guide plate coincides with the first side edge, the guide plate is located on top of the conveyor belt and is tilted upward relative to the conveyor belt, so that the sludge is guided into the gap between the press plate and the conveyor belt;

[0037] A roller is added parallel to the first side to cooperate with the pressing plate to squeeze the strip-shaped sludge;

[0038] When the sludge group is transported to the pressing area by the conveyor belt, the pressing plate presses and dehydrates the sludge group.

[0039] Optionally, the moisture content determination strategy is performed on the mud cake after squeezing and dehydration of each candidate sludge group, including:

[0040] The midpoint of each strip of sludge in the width direction is recorded as the sludge center point;

[0041] The midpoint of the line connecting the center points of the adjacent sludge strips perpendicular to the conveying direction of the conveyor belt is the interval center point;

[0042] Obtaining the sludge cake after the candidate sludge group is squeezed and dehydrated;

[0043] Set the measurement interval for measuring the moisture content of mud cake;

[0044] Wherein, a sludge measuring point is set at every measuring interval starting from the sludge center point along the conveying direction of the conveyor belt;

[0045] Obtain all sludge measurement points on the mud cake, obtain the mud cake on each sludge measurement point, and record the sludge sample of each sludge measurement point;

[0046] An interval measurement point is set at each measurement interval starting from the interval center point along the conveying direction of the conveyor belt;

[0047] Obtain all interval measurement points on the mud cake, obtain the mud cake on each interval measurement point, and record it as the interval sample of each interval measurement point;

[0048] Measure the moisture content of all sludge samples;

[0049] Measure the moisture content of all interval samples;

[0050] Calculate the mean of all moisture contents and use the result as the moisture content of the candidate sludge group.

[0051] Optionally, the moisture content determination strategy is performed on the mud cake after squeezing and dehydration of each candidate sludge group, including:

[0052] The moisture content is measured as follows:

[0053] The samples whose moisture content needs to be measured are recorded as experimental samples:

[0054] Obtain the weight of the experimental sample and record it as the total sample weight;

[0055] Dry the experimental sample and measure the weight of the dried experimental sample, which is recorded as the dry weight of the sample;

[0056] Calculate (total sample weight - dry sample weight) / total sample weight = moisture content.

[0057] Optionally, executing the pressure replenishment strategy includes:

[0058] Get any two adjacent sludge strips on the target mud cake;

[0059] For each strip of sludge:

[0060] The moisture content of all sludge samples on the strip of sludge is obtained, and recorded as the first sludge moisture content, the second sludge moisture content, ... the mth sludge moisture content;

[0061] Perform the following formula:

[0062] Calculate (the first sludge moisture content + the second sludge moisture content + ... + the mth sludge moisture content) / m = the first determined moisture content;

[0063] The first determined moisture content of the two strips of sludge is obtained, and the average is calculated, and the result is recorded as the average determined moisture content.

[0064] Optionally, executing the pressure replenishment strategy includes:

[0065] When the strip sludge is squeezed and dehydrated, the strip sludge extends to both sides;

[0066] The area where the strip sludge is extended after being squeezed and dehydrated is recorded as the extended area, and the extended areas of adjacent strip sludges after being squeezed and dehydrated overlap;

[0067] The moisture content of all interval samples on the sludge cake between adjacent strips of sludge is obtained, and recorded as the first interval moisture content, the second interval moisture content, ... the tth interval moisture content;

[0068] Perform the following formula:

[0069] Calculate (the first interval moisture content + the second interval moisture content + ... + the tth interval moisture content) / t = the second determined moisture content;

[0070] Set the judgment ratio for determining whether to execute the pressure replenishment strategy;

[0071] When the second determined moisture content is greater than the average determined moisture content*(1+determination ratio), the mud cake between the sludge center points of adjacent sludge strips is recorded as the target pressure-replenishing mud cake.

[0072] Optionally, executing the pressure replenishment strategy includes:

[0073] Obtain all target pressure-replenishing mud cakes;

[0074] To compress the mud cake for any target:

[0075] The target pressure-replenishing mud cake is divided into a plurality of split mud cakes along the conveying direction of the conveyor belt, wherein each split mud cake is in the shape of a cuboid and has the same volume;

[0076] For any partitioned mud cake:

[0077] Measure the moisture content x of the split mud cake;

[0078] Get the thickness y of the split mud cake;

[0079] Calculate x*y and record the result as the compression height;

[0080] Obtain the compression height of all segmented mud cakes, calculate the average, and record it as the target height;

[0081] Obtain the intersection of the straight line formed by the center points of the target pressure-replenishing mud cakes and the first side of the press plate, and record it as the target pressure-replenishing position of each target pressure-replenishing mud cake on the press plate;

[0082] Obtain the point on the roller where each target pressure compensation position is mapped and record it as the target positioning point;

[0083] A roller is provided at each target positioning point of the roller, wherein the height to which the roller squeezes the target pressure-compensating mud cake is the corresponding target height.

[0084] The present invention has the following beneficial effects:

[0085] 1. The electroplating grinding wastewater recovery and treatment method uses different diverters to divide the sludge to be treated into strips of sludge of the same height and thickness but different quantities, so that when different numbers of sludge strips are added in sequence for squeezing, the moisture content of the mud cake is measured, and the sludge strips corresponding to the mud cake with the minimum moisture content are used as the standard number for dividing the sludge to be treated, thereby improving the standardization of wastewater treatment. Among them, an overflow judgment strategy is first executed on each sludge group to prevent sludge overflow during operation, and the sludge group is screened in the first step to improve the standardization of wastewater treatment and prevent accidents and waste of resources during the treatment process.

[0086] 2. The electroplating grinding wastewater recovery and treatment method uses the moisture content of the mud cake at the midpoint of the width direction of the strip sludge to represent the moisture content of the strip sludge, simplifies the treatment steps, improves efficiency, and helps to scientifically evaluate the treatment effect. The measurement interval is set, and a sludge measurement point is set every measurement interval in the conveying direction of the conveyor belt. The mud cakes at multiple sludge measurement points are obtained to obtain multiple sludge samples. Similarly, multiple interval samples are obtained, and the moisture content of all sludge samples and interval samples is measured. The mean is calculated to obtain the moisture content of the mud cake. The mud cake with the minimum moisture content is used as the target mud cake. Multiple samples on the mud cake are obtained to calculate the moisture content. The moisture distribution of the entire sludge pressing block can be understood in detail, and it is helpful to evaluate the overall pressing effect, ensure the accuracy and representativeness of the data, help to scientifically evaluate the treatment effect, determine the moisture content of each sludge group, select the best treatment plan, and optimize the entire treatment process.

[0087] 3. This electroplating grinding wastewater recovery and treatment method adds a pressing plate and a guide plate, so that the divided strip sludge flows into the gap between the pressing plate and the conveyor belt through the guide plate, which facilitates the subsequent dehydration of the sludge through the pressing plate, ensuring the uniformity and efficiency of the pressing process. The pressing effect can be further improved and the moisture content of the sludge can be reduced by roller pressure supplementation.

[0088] 4. In the process of determining the moisture content of the mud cake, the drying method is used to measure the moisture content. This is an accurate method. Since the moisture can be completely removed, the data obtained is very reliable. This method can ensure the consistency and comparability between the various measurements, thereby effectively evaluating the pressing effect. The moisture content is calculated using a simple formula, which is easy to operate and understand, reducing the possibility of errors during operation and ensuring the accuracy of data processing.

[0089] 5. In the electroplating grinding wastewater recovery and treatment method, in the process of squeezing and dehydrating the strip sludge, the strip sludge will inevitably extend. In actual application, the extension areas of the strip sludge are overlapped, which can increase the number of strip sludge processed at one time, increase the amount of sludge to be processed at one time, and improve the dehydration efficiency. Since the height of the extension area is lower than the height of the squeezed strip sludge, even if the extension areas of two strips of sludge overlap, the same squeezing effect as the center of the strip sludge may not be achieved. Therefore, it is necessary to supplement the pressure of the interval area between adjacent strips of sludge to optimize the squeezing effect and reduce the residual moisture in the overlapping part of the extension area. Among them, the moisture content of the interval sample is compared with the average moisture content of the strip sludge. By determining the ratio, the area where the difference between the moisture content of the interval sample and the average moisture content of the strip sludge is too large is recorded as the target pressure-supplementing mud cake, and then a roller is added to the target pressure-supplementing mud cake for supplementary pressure. Targeted pressure supplementation is performed to optimize the squeezing effect and reduce residual moisture.

[0090] 6. The electroplating grinding wastewater recovery and treatment method evenly divides the target pressure-replenishing mud cake and measures the moisture content of each piece, which can more accurately control and adjust the squeezing process to ensure that each part achieves the best dehydration effect; the moisture content of each target pressure-replenishing mud cake is different. When the dehydration effect of the target pressure-replenishing mud cake is the same as the dehydration effect of the center part of the strip sludge, the volume of the target pressure-replenishing mud cake will decrease, and the thickness of the target pressure-replenishing mud cake will decrease accordingly. The product of the moisture content and the thickness is calculated to obtain the compression height, which is the reduced thickness of the target pressure-replenishing mud cake. The compression height of all divided mud cakes is obtained, and the average is calculated as the reduced thickness of the entire target pressure-replenishing mud cake after compression again. At this time, a roller can be added so that the height of the roller squeezing the target pressure-replenishing mud cake is just equal to the target height, ensuring the accuracy and effectiveness of the pressure-replenishing process; setting the roller to correspond to the target pressure-replenishing position can more accurately apply pressure to the problem area, optimize the dehydration effect and save energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0091] Figure 1 Schematic diagram of the press plate and guide plate of the present invention;

[0092] Figure 2 This is a schematic diagram of the shape of the strip sludge after dehydration in the present invention;

[0093] Figure 3 Schematic diagram of the roller for adding a roller;

[0094] Figure 4 Schematic diagram of mud cake division. DETAILED DESCRIPTION

[0095] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments 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.

[0096] Example 1, a method for recycling and treating electroplating grinding wastewater, comprising:

[0097] Obtain wastewater after electroplating and grinding;

[0098] Adding pH regulators and flocculants to wastewater causes all metal ions to precipitate into sludge;

[0099] Collect the settled sludge and record it as sludge to be treated;

[0100] A plurality of diverters perpendicular to the conveying direction of the conveyor belt are arranged on the conveyor belt, and the diverters are used to evenly divide the sludge to be treated into a plurality of strips of sludge;

[0101] Different diverters are used to divide the sludge to be processed on the conveyor belt into different numbers of strips of sludge;

[0102] The width and height of the strips of sludge divided by different diverters are equal;

[0103] In the strips of sludge formed by different diverters, the intervals between two adjacent strips of sludge are different;

[0104] The number of strips of sludge formed by different diverters is recorded as the first number, the second number, and so on, the nth number in descending order;

[0105] All the strips of sludge formed by the diverter are divided into sludge groups, wherein the sludge groups corresponding to the first number, the second number, ... the nth number of strips of sludge are respectively recorded as the first sludge group, the second sludge group, ... the nth sludge group;

[0106] For each sludge group:

[0107] Squeeze and dewater the sludge group;

[0108] Execute the overflow determination strategy to determine whether the sludge group is a candidate sludge group;

[0109] The moisture content determination strategy is performed on the mud cake after squeezing and dehydration of each candidate sludge group, and each candidate sludge group corresponds to a moisture content;

[0110] The candidate sludge group with the lowest moisture content is recorded as the target sludge group;

[0111] Obtain the mud cake corresponding to the target sludge group, which is recorded as the target mud cake;

[0112] Implement the pressure replenishment strategy and add rollers to replenish pressure when squeezing and dehydrating the sludge to be treated.

[0113] The execution overflow determination strategy includes:

[0114] When the sludge group is squeezed and dehydrated,

[0115] Determine whether sludge overflows from both sides of the conveyor belt;

[0116] The sludge group without sludge overflowing from both sides of the conveyor belt is recorded as the candidate sludge group.

[0117] Different diverters are used to divide the sludge to be treated into strips of sludge of the same height and thickness but different quantities, so that when different numbers of sludge strips are added in sequence for squeezing, the moisture content of the sludge cake is measured. The strips of sludge corresponding to the sludge cake with the minimum moisture content are used as the standard number for dividing the sludge to be treated, thereby improving the standardization of wastewater treatment. Among them, an overflow judgment strategy is first executed on each sludge group to prevent sludge overflow during operation, and the sludge group is screened in the first step to improve the standardization of wastewater treatment and prevent accidents and waste of resources during the treatment process.

[0118] The squeezing and dehydrating of the sludge group comprises:

[0119] A pressing plate is provided for pressing and dewatering the sludge group, wherein the pressing plate is rectangular in shape;

[0120] Get the area on the conveyor belt where squeezing and dehydration is performed, and record it as the squeezing area;

[0121] Get the length of the pressing area and record it as the pressing length;

[0122] Get the width of the pressing area, and record it as the pressing width;

[0123] The width of the press plate is equal to the press width, and the length of the press plate is equal to the press length;

[0124] The press board is parallel to the conveyor belt and is located on top of the conveyor belt;

[0125] Obtain two widths of the press plate, wherein the width close to the diverter is recorded as the first side;

[0126] A guide plate is provided for guiding the sludge group, wherein the guide plate is rectangular in shape;

[0127] The width of the guide plate coincides with the first side edge, the guide plate is located on top of the conveyor belt and is tilted upward relative to the conveyor belt, so that the sludge is guided into the gap between the press plate and the conveyor belt;

[0128] A roller is added parallel to the first side to cooperate with the pressing plate to squeeze the strip-shaped sludge;

[0129] When the sludge group is transported to the pressing area by the conveyor belt, the pressing plate presses and dehydrates the sludge group.

[0130] In this embodiment, refer to Figure 1 , the positional relationship between the conveyor belt, press plate and guide plate.

[0131] By adding pressing plates and guide plates, the divided strip sludge will flow into the gap between the pressing plates and the conveyor belt through the guide plates, which facilitates the subsequent dehydration of the sludge through the pressing plates, ensuring the uniformity and efficiency of the pressing process. By adding roller pressure, the pressing effect can be further improved and the moisture content of the sludge can be reduced.

[0132] The moisture content determination strategy for the mud cake after squeezing and dehydration of each candidate sludge group includes:

[0133] The midpoint of each strip of sludge in the width direction is recorded as the sludge center point;

[0134] In this embodiment, the position of the sludge center point is referenced Figure 2 ;

[0135] The midpoint of the line connecting the center points of the adjacent sludge strips perpendicular to the conveying direction of the conveyor belt is the interval center point;

[0136] In this embodiment, the position of the interval center point is referenced Figure 1 ;

[0137] Obtaining the sludge cake after the candidate sludge group is squeezed and dehydrated;

[0138] Set the measurement interval for measuring the moisture content of mud cake;

[0139] Wherein, a sludge measuring point is set at every measuring interval starting from the sludge center point along the conveying direction of the conveyor belt;

[0140] Obtain all sludge measurement points on the mud cake, obtain the mud cake on each sludge measurement point, and record the sludge sample of each sludge measurement point;

[0141] An interval measurement point is set at each measurement interval starting from the interval center point along the conveying direction of the conveyor belt;

[0142] Obtain all interval measurement points on the mud cake, obtain the mud cake on each interval measurement point, and record it as the interval sample of each interval measurement point;

[0143] Measure the moisture content of all sludge samples;

[0144] Measure the moisture content of all interval samples;

[0145] Calculate the mean of all moisture contents and use the result as the moisture content of the candidate sludge group.

[0146] The moisture content of the mud cake at the midpoint of the width direction of the sludge strip is used to represent the moisture content of the sludge strip, which simplifies the treatment steps, improves efficiency, and helps to scientifically evaluate the treatment effect. The measurement interval is set, and a sludge measurement point is set every measurement interval in the conveying direction of the conveyor belt. The mud cakes at multiple sludge measurement points are obtained to obtain multiple sludge samples. Similarly, multiple interval samples are obtained. The moisture content of all sludge samples and interval samples is measured, and the mean is calculated to obtain the moisture content of the mud cake. The mud cake with the minimum moisture content is used as the target mud cake. Multiple samples on the mud cake are obtained to calculate the moisture content. This can provide a detailed understanding of the moisture distribution of the entire sludge pressing block, and at the same time help to evaluate the overall pressing effect, ensure the accuracy and representativeness of the data, help to scientifically evaluate the treatment effect, determine the moisture content of each sludge group, select the best treatment plan, and optimize the entire treatment process.

[0147] The moisture content determination strategy for the mud cake after squeezing and dehydration of each candidate sludge group includes:

[0148] The moisture content is measured as follows:

[0149] The samples whose moisture content needs to be measured are recorded as experimental samples:

[0150] Obtain the weight of the experimental sample and record it as the total sample weight;

[0151] Dry the experimental sample and measure the weight of the dried experimental sample, which is recorded as the dry weight of the sample;

[0152] Calculate (total sample weight - dry sample weight) / total sample weight = moisture content.

[0153] In the process of determining the moisture content of mud cake, the drying method is an accurate method to measure the moisture content. Since the moisture can be completely removed, the data obtained is very reliable. This method can ensure the consistency and comparability between various measurements, thereby effectively evaluating the pressing effect. The moisture content is calculated using a simple formula, which is easy to operate and understand, reducing the possibility of errors during operation and ensuring the accuracy of data processing.

[0154] The execution of the pressure replenishment strategy includes:

[0155] Get any two adjacent sludge strips on the target mud cake;

[0156] For each strip of sludge:

[0157] The moisture content of all sludge samples on the strip of sludge is obtained, and recorded as the first sludge moisture content, the second sludge moisture content, ... the mth sludge moisture content;

[0158] Perform the following formula:

[0159] Calculate (the first sludge moisture content + the second sludge moisture content + ... + the mth sludge moisture content) / m = the first determined moisture content;

[0160] The first determined moisture content of the two strips of sludge is obtained, and the average is calculated, and the result is recorded as the average determined moisture content.

[0161] The execution of the pressure replenishment strategy includes:

[0162] When the strip sludge is squeezed and dehydrated, the strip sludge extends to both sides;

[0163] The area where the strip sludge is extended after being squeezed and dehydrated is recorded as the extended area, and the extended areas of adjacent strip sludges after being squeezed and dehydrated overlap;

[0164] In this embodiment, the shape of the strip sludge extension area refers to Figure 2 ;

[0165] The moisture content of all interval samples on the sludge cake between adjacent strips of sludge is obtained, and recorded as the first interval moisture content, the second interval moisture content, ... the tth interval moisture content;

[0166] Perform the following formula:

[0167] Calculate (the first interval moisture content + the second interval moisture content + ... + the tth interval moisture content) / t = the second determined moisture content;

[0168] Set the judgment ratio for determining whether to execute the pressure replenishment strategy;

[0169] When the second determined moisture content is greater than the average determined moisture content*(1+determination ratio), the mud cake between the sludge center points of adjacent sludge strips is recorded as the target pressure-replenishing mud cake.

[0170] In the process of squeezing and dehydrating strip sludge, the strip sludge will inevitably extend. In actual application, the extension areas of the strip sludge are overlapped, which can increase the number of strip sludge processed at one time, increase the amount of sludge to be processed at one time, and improve the efficiency of dehydration. Since the height of the extension area is lower than the height of the pressed strip sludge, even if the extension areas of two strip sludge overlap, the same squeezing effect as the center of the strip sludge may not be achieved. Therefore, it is necessary to supplement the pressure of the interval area between adjacent strip sludge to optimize the squeezing effect and reduce the residual moisture in the overlapping part of the extension area. Among them, the moisture content of the interval sample is compared with the average moisture content of the strip sludge. By determining the ratio, the area where the difference between the moisture content of the interval sample and the average moisture content of the strip sludge is too large is recorded as the target pressure-supplementing mud cake, and then a roller is added to the target pressure-supplementing mud cake for targeted pressure-supplementing, thereby optimizing the squeezing effect and reducing residual moisture.

[0171] The execution of the pressure replenishment strategy includes:

[0172] Obtain all target pressure-replenishing mud cakes;

[0173] To compress the mud cake for any target:

[0174] The target pressure-replenishing mud cake is divided into a plurality of split mud cakes along the conveying direction of the conveyor belt, wherein each split mud cake is in the shape of a cuboid and has the same volume;

[0175] For any partitioned mud cake:

[0176] Measure the moisture content x of the split mud cake;

[0177] Get the thickness y of the split mud cake;

[0178] Calculate x*y and record the result as the compression height;

[0179] Obtain the compression height of all segmented mud cakes, calculate the average, and record it as the target height;

[0180] Obtain the intersection of the straight line formed by the center points of the target pressure-replenishing mud cakes and the first side of the press plate, and record it as the target pressure-replenishing position of each target pressure-replenishing mud cake on the press plate;

[0181] Obtain the point on the roller where each target pressure compensation position is mapped and record it as the target positioning point;

[0182] A roller is provided at each target positioning point of the roller, wherein the height to which the roller squeezes the target pressure-compensating mud cake is the corresponding target height.

[0183] In this embodiment, the compression height of the split mud cake is referenced to Figure 4 ;

[0184] In this embodiment, the roller shaft diagram of the additional roller is shown in FIG. Figure 3 In this embodiment, the number of sludge strips is 2, which are respectively recorded as the first sludge strip and the second sludge strip; the position of the target pressure-replenishing mud cake is the overlapping position of the two sludge strip extension areas.

[0185] Evenly dividing the target pressure-boosting mud cake and measuring the moisture content of each piece can more accurately control and adjust the squeezing process to ensure that each part achieves the best dehydration effect; the moisture content of each target pressure-boosting mud cake is different. When the dehydration effect of the target pressure-boosting mud cake is the same as the dehydration effect of the center part of the strip sludge, the volume of the target pressure-boosting mud cake will decrease, and the thickness of the target pressure-boosting mud cake will decrease accordingly. The product of the moisture content and the thickness is calculated to obtain the compression height. The compression height is the reduced thickness of the target pressure-boosting mud cake. The compression height of all divided mud cakes is obtained, and the average is calculated as the reduced thickness of the entire target pressure-boosting mud cake after compression again. At this time, a roller can be added so that the height of the roller squeezing the target pressure-boosting mud cake is exactly equal to the target height, ensuring the accuracy and effectiveness of the pressure-boosting process; setting the roller to correspond to the target pressure-boosting position can more accurately apply pressure to the problem area, optimize the dehydration effect and save energy.

[0186] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0187] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for recycling and treating electroplating grinding wastewater, comprising: Obtain wastewater after electroplating and grinding; Adding pH regulators and flocculants to wastewater causes all metal ions to precipitate into sludge; Collect the settled sludge and record it as sludge to be treated; A plurality of diverters perpendicular to the conveying direction of the conveyor belt are arranged on the conveyor belt, and the diverters are used to evenly divide the sludge to be treated into a plurality of strips of sludge; Different diverters are used to divide the sludge to be processed on the conveyor belt into different numbers of strips of sludge; The width and height of the strips of sludge divided by different diverters are equal; In the strips of sludge formed by different diverters, the intervals between two adjacent strips of sludge are different; The number of strips of sludge formed by different diverters is recorded as the first number, the second number, and so on, the nth number in descending order; All the strips of sludge formed by the diverter are divided into sludge groups, wherein the sludge groups corresponding to the first number, the second number, ... the nth number of strips of sludge are respectively recorded as the first sludge group, the second sludge group, ... the nth sludge group; For each sludge group: Squeeze and dewater the sludge group; Executing the overflow determination strategy to determine whether the sludge group is a candidate sludge group, including: determining whether sludge overflows from both sides of the conveyor belt, and recording the sludge group without sludge overflowing from both sides of the conveyor belt as a candidate sludge group; The moisture content determination strategy is performed on the mud cake after squeezing and dehydration of each candidate sludge group, and each candidate sludge group corresponds to a moisture content; The candidate sludge group with the lowest moisture content is recorded as the target sludge group; Obtain the mud cake corresponding to the target sludge group, which is recorded as the target mud cake; When the strip-shaped sludge in the target mud cake is squeezed and dehydrated, the strip-shaped sludge extends to both sides; The area where the strip sludge is extended after being squeezed and dehydrated is recorded as the extension area, and the extension areas of adjacent strips of sludge after being squeezed and dehydrated overlap. The target pressure cake position is the overlapping position of the two strips of sludge extension areas; The pressure replenishment strategy is implemented. When the target pressure replenishment mud cake is squeezed and dehydrated, rollers are added to replenish the pressure of the target pressure replenishment mud cake.

2. The method for recycling electroplating grinding wastewater according to claim 1, characterized in that: The squeezing and dehydrating of the sludge group comprises: A pressing plate is provided for pressing and dewatering the sludge group, wherein the pressing plate is rectangular in shape; Get the area on the conveyor belt where squeezing and dehydration is performed, and record it as the squeezing area; Get the length of the pressing area and record it as the pressing length; Get the width of the pressing area, and record it as the pressing width; The width of the press plate is equal to the press width, and the length of the press plate is equal to the press length; The press board is parallel to the conveyor belt and is located on top of the conveyor belt; Obtain two widths of the press plate, wherein the width close to the diverter is recorded as the first side; A guide plate is provided for guiding the sludge group, wherein the guide plate is rectangular in shape; The width of the guide plate coincides with the first side edge, the guide plate is located on top of the conveyor belt and is tilted upward relative to the conveyor belt, so that the sludge is guided into the gap between the press plate and the conveyor belt; A roller is added parallel to the first side to cooperate with the pressing plate to squeeze the strip-shaped sludge; When the sludge group is transported to the pressing area by the conveyor belt, the pressing plate presses and dehydrates the sludge group.

3. The method for recycling electroplating grinding wastewater according to claim 2, characterized in that: The moisture content determination strategy for the mud cake after squeezing and dehydration of each candidate sludge group includes: The midpoint of each strip of sludge in the width direction is recorded as the sludge center point; The midpoint of the line connecting the center points of the adjacent sludge strips perpendicular to the conveying direction of the conveyor belt is recorded as the interval center point; Obtaining the sludge cake after the candidate sludge group is squeezed and dehydrated; Set the measurement interval for measuring the moisture content of mud cake; Wherein, a sludge measuring point is set at every measuring interval starting from the sludge center point along the conveying direction of the conveyor belt; Obtain all sludge measurement points on the mud cake, obtain the mud cake on each sludge measurement point, and record the sludge sample of each sludge measurement point; An interval measurement point is set at each measurement interval starting from the interval center point along the conveying direction of the conveyor belt; Obtain all interval measurement points on the mud cake, obtain the mud cake on each interval measurement point, and record it as the interval sample of each interval measurement point; Measure the moisture content of all sludge samples; Measure the moisture content of all interval samples; Calculate the mean of all moisture contents and use the result as the moisture content of the candidate sludge group.

4. The method for recycling electroplating grinding wastewater according to claim 3, wherein: The moisture content determination strategy for the mud cake after squeezing and dehydration of each candidate sludge group includes: The moisture content is measured as follows: The samples whose moisture content needs to be measured are recorded as experimental samples; Obtain the weight of the experimental sample and record it as the total sample weight; Dry the experimental sample and measure the weight of the dried experimental sample, which is recorded as the dry weight of the sample; Calculate (total sample weight - dry sample weight) / total sample weight = moisture content.

5. The method for recycling electroplating grinding wastewater according to claim 3, characterized in that: The execution of the pressure replenishment strategy includes: Get any two adjacent sludge strips on the target mud cake; For each strip of sludge: The moisture content of all sludge samples on the strip of sludge is obtained, and recorded as the first sludge moisture content, the second sludge moisture content, ... the mth sludge moisture content; Perform the following formula: Calculate (the first sludge moisture content + the second sludge moisture content + ... + the mth sludge moisture content) / m = the first determined moisture content; The first determined moisture content of the two strips of sludge is obtained, and the average is calculated, and the result is recorded as the average determined moisture content.

6. The method for recycling electroplating grinding wastewater according to claim 5, characterized in that: The execution of the pressure replenishment strategy includes: When the strip sludge is squeezed and dehydrated, the strip sludge extends to both sides; The area where the strip sludge is extended after being squeezed and dehydrated is recorded as the extended area, and the extended areas of adjacent strip sludges after being squeezed and dehydrated overlap; The moisture content of all interval samples on the sludge cake between adjacent strips of sludge is obtained, and recorded as the first interval moisture content, the second interval moisture content, ... the tth interval moisture content; Perform the following formula: Calculate (the first interval moisture content + the second interval moisture content + ... + the tth interval moisture content) / t = the second determined moisture content; Set the judgment ratio for determining whether to execute the pressure replenishment strategy; When the second determined moisture content is greater than the average determined moisture content*(1+determination ratio), the mud cake between the sludge center points of adjacent sludge strips is recorded as the target pressure-replenishing mud cake.

7. The method for recycling electroplating grinding wastewater according to claim 6, characterized in that: The execution of the pressure replenishment strategy includes: Obtain all target pressure-replenishing mud cakes; To compress the mud cake for any target: The target pressure-replenishing mud cake is divided into a plurality of split mud cakes along the conveying direction of the conveyor belt, wherein each split mud cake is in the shape of a cuboid and has the same volume; For any partitioned mud cake: Measure the moisture content x of the split mud cake; Get the thickness y of the split mud cake; Calculate x*y and record the result as the compression height; Obtain the compression height of all segmented mud cakes, calculate the average, and record it as the target height; Obtain the intersection of the straight line formed by the center points of the target pressure-replenishing mud cakes and the first side of the press plate, and record it as the target pressure-replenishing position of each target pressure-replenishing mud cake on the press plate; Obtain the point on the roller where each target pressure compensation position is mapped and record it as the target positioning point; A roller is provided at each target positioning point of the roller, wherein the height to which the roller squeezes the target pressure-compensating mud cake is the corresponding target height.

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