CN209858423U - Rapid determination instrument for content of trivalent chromium in chrome tanning waste liquid - Google Patents
Rapid determination instrument for content of trivalent chromium in chrome tanning waste liquid Download PDFInfo
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- CN209858423U CN209858423U CN201920505362.4U CN201920505362U CN209858423U CN 209858423 U CN209858423 U CN 209858423U CN 201920505362 U CN201920505362 U CN 201920505362U CN 209858423 U CN209858423 U CN 209858423U
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Abstract
The utility model discloses a rapid determination appearance of chrome tanning waste liquid trivalent chromium content relates to tanning technical field. The rapid tester comprises a liquid absorbance fixed value detection module, a circuit and control module, a liquid pipeline and a conveying module; the liquid absorbance fixed value detection module comprises a cuvette, a visible light emitter, a light source detector, a shading cover and an ultrasonic emitter; the circuit and control module comprises a singlechip, an electronic touch display screen, a button and an electric wire; the liquid pipeline and conveying module comprises a sample liquid extracting device, a clear water extracting device, a liquid extracting head, a micro peristaltic pump, a sample liquid circulating pipeline, a clear water circulating pipeline, an electromagnetic valve and an overflow pipe; the detection method comprises the steps of calculating a chromium content-absorbance standard curve equation and calculating the chromium content in the chrome tanning waste liquid; the rapid measuring instrument is simple in operation and implementation process, the adopted detection materials are friendly to the environment, the error of the detection method is small, and the rapid measuring instrument is suitable for popularization and use of various tanning enterprises.
Description
Technical Field
The utility model relates to a tanning technical field, in particular to rapid determination appearance of chrome tanning waste liquid trivalent chromium content and detection method thereof.
Background
In the existing chrome tanning process, the absorption rate of chrome on the hide is generally low and is only 60 percent ~ 70 percent, and chrome tanning waste liquid still contains 2000 ~ 4000mg/L of chrome, moreover, in order to avoid the hide from being acid-swollen, workers usually add 50 ~ 60g/L of NaCl into the chrome tanning liquid, at present, no particularly economic and effective treatment method for the treatment of the chrome tanning waste liquid exists, and enterprises usually recycle the chrome tanning waste liquid for next tanning.
Before the chrome tanning waste liquid is recycled, the chromium content, the salt content and the pH value are measured, and the chromium in the chrome tanning waste liquid is mainly a water-soluble trivalent chromium complex and does not relate to hexavalent chromium ions. The method for measuring the content of trivalent chromium mainly comprises an iodometry method and a sodium chromate colorimetric method, wherein the sodium chromate colorimetric method has relatively accurate measurement results, but in the measuring process, more chemical reagents need to be prepared, samples need to be subjected to pretreatment such as oxidation and reduction, and special technical personnel need to operate.
In the process of implementing the present invention, the inventor finds that at least the following defects exist in the prior art: due to the problems of enterprise management, lack of technicians and the like, more leather production enterprises do not have special chemical examination personnel, so that many enterprises can only rely on solution color discrimination to estimate and judge when judging the chromium content in the chrome tanning waste liquid at present, and the method is very empirical and random and is easy to cause process instability. And at present, a chromium content detector does not exist, and the automatic instrument for detecting the chromium content in the tanning industry is a big blank.
Disclosure of Invention
In order to solve the above-mentioned problem that prior art exists, the embodiment of the utility model provides a rapid measurement appearance of chrome tanning waste liquid trivalent chromium content and detection method thereof through regarding single chip computer as central processing unit and multiunit module collaborative work to adopt high definition touch display screen output, the test result is more directly perceived, and human-computer interaction is simple and convenient. The technical scheme is as follows:
in a first aspect, the embodiment of the utility model provides a rapid determination instrument for the content of trivalent chromium in chrome tanning waste liquid, which comprises a liquid absorbance fixed value detection module, a circuit and control module, a liquid pipeline and a conveying module;
the liquid absorbance fixed value detection module comprises a cuvette, a visible light emitter is arranged on the left side of the cuvette, a light source detector is arranged on the right side of the cuvette, a light shielding cover is arranged at one end, close to the cuvette, of the light source detector, the cuvette adopts a one-inlet two-outlet type structure, an inlet and an outlet are formed in the bottom end of the cuvette, an outlet is formed in the top of the cuvette, an ultrasonic emitter is arranged around the cuvette, and when the cuvette is fully occupied by clear water, the ultrasonic emitter works and is used for cleaning the cuvette;
the circuit and control module comprises a single chip microcomputer, an electronic touch display screen, a button and an electric wire, the single chip microcomputer and the electric wire are arranged inside the rapid tester, and the electronic touch display screen and the button are arranged on the surface of the front end of the rapid tester;
the liquid pipeline and conveying module comprises a sample liquid extracting device and a clear water extracting device, a first liquid extracting head is arranged at one end of the sample liquid extracting device, a rotating shaft is arranged at the bottom of the sample liquid extracting device, a first micro peristaltic pump is arranged inside the first liquid extracting head, a sample liquid circulating pipeline is arranged in the sample liquid extracting device, a second liquid extracting head is arranged at one end of the clear water extracting device, a second micro peristaltic pump is arranged inside the second liquid extracting head, a clear water circulating pipeline is arranged in the clear water extracting device, the tail end of the sample liquid circulating pipeline and the tail end of the clear water circulating pipeline are combined into a liquid circulating pipeline, a pipeline cleaning bulge is arranged at the tail end of the sample liquid circulating pipeline, the liquid circulating pipeline is connected with an inlet at the lower end of the cuvette, a first electromagnetic valve is arranged in front of the inlet, an outlet at the upper end of the cuvette is connected with an overflow pipe, and an outlet at the lower end of the cuvette is connected with a second electromagnetic valve, and the second electromagnetic valve and the overflow pipe are combined and connected with a liquid outlet pipe.
Preferably, the top of rapid survey appearance still is provided with sample liquid and holds platform and clear water container and place the department, sample liquid hold the platform set up in sample liquid draw-out device's below, sample liquid holds bench and is provided with four sample liquid places departments of awaiting measuring, clear water container place the department set up in clear water draw-out device's below.
Preferably, the left side of the rapid tester is also provided with a three-phase power socket, a circuit fusing protector, an RS232 communication port of a PLC and a computer communication interface.
Preferably, the upper end of the liquid absorbance definite value detection module is provided with an access cover, the upper end of the access cover is provided with an access knob, and the detection cover can be opened by rotating the knob rightwards.
On the other hand, the embodiment of the utility model provides a detection method of chrome tanning waste liquid trivalent chromium content still is provided, include the following step:
calculating a chromium content-absorbance standard curve equation: respectively preparing standard chromium-containing solutions with different chromium contents by using standard chromium powder, respectively measuring the absorbance of each standard chromium-containing solution with the chromium content at a fixed value by using a visible spectrophotometer to obtain corresponding data of the chromium content and the absorbance, and calculating to obtain a standard curve equation according to the corresponding data of the chromium content and the absorbance;
calculating the chromium content in the chrome tanning waste liquid: sending the chrome tanning waste liquid with preset weight into a gauze for first filtration, then sending the chrome tanning waste liquid into a sand core funnel for second filtration to obtain chrome tanning filtrate, placing the chrome tanning filtrate into a cuvette, measuring the target absorbance of the chrome tanning filtrate at a fixed value by using a visible spectrophotometer, and calculating the chromium content in the chrome tanning waste liquid according to the target absorbance of the chrome tanning filtrate at the fixed value and the standard curve equation obtained in the previous step.
In a preferred embodiment, the fixed value in the detection method is 590nm, the aperture of the gauze is 0.6mm, the aperture of the filter plate of the sand core funnel is 4 ~ 7um, and the width of the cuvette is 1 cm.
The detection method is realized based on the rapid determination instrument for the content of trivalent chromium in the chrome tanning waste liquid.
Compared with the prior art, the utility model provides a pair of rapid determination appearance of chrome tanning waste liquid trivalent chromium content and detection method has following advantage:
in the utility model provides a rapid determinator for chrome tanning waste liquid trivalent chromium content and detection method thereof, the rapid determinator comprises a liquid absorbance fixed value detection module, a circuit and control module, a liquid pipeline and a conveying module; the liquid absorbance fixed value detection module comprises a cuvette, a visible light emitter, a light source detector, a shading cover and an ultrasonic emitter; the circuit and control module comprises a single chip microcomputer, an electronic touch display screen, a button and an electric wire. The liquid pipeline and conveying module comprises a sample liquid extracting device, a clear water extracting device, a liquid extracting head, a micro peristaltic pump, a sample liquid circulating pipeline, a clear water circulating pipeline, an electromagnetic valve and an overflow pipe. The rapid measuring instrument is simple in operation implementation flow, low in requirement on operators, environment-friendly in adopted detection materials and suitable for popularization and use of various tanning enterprises. In addition, the detection method corresponding to the rapid detector has small error in the detection method of the content of the trivalent chromium in the chrome tanning waste liquid, and is suitable for rapid and accurate determination.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a front view of a rapid determination instrument for the content of trivalent chromium in chrome tanning waste liquid provided by the embodiment of the utility model.
Fig. 2 is a left side view of a rapid determination instrument for the content of trivalent chromium in chrome tanning waste liquid provided by the embodiment of the utility model.
Fig. 3 is a schematic diagram of a module for detecting absorbance fixed value of liquid according to an embodiment of the present invention.
Fig. 4 is a schematic view of a liquid pipeline and a conveying module according to an embodiment of the present invention.
Fig. 5 is a top view of a rapid determination instrument for the content of trivalent chromium in chrome tanning waste liquid provided by an embodiment of the utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Fig. 1 ~ 5 shows three views of a rapid analyzer for determining the content of trivalent chromium in chrome tanning waste liquid, a schematic diagram of a liquid absorbance fixed value detection module, and a schematic diagram of a liquid pipeline and a conveying module.
As shown in the figure, the rapid determinator for the content of trivalent chromium in chrome tanning waste liquid comprises a liquid absorbance fixed value detection module, a circuit and control module, a liquid pipeline and a conveying module.
As shown in fig. 3, the liquid absorbance fixed value detection module includes a cuvette (19), a visible light emitter (16) is disposed on the left side of the cuvette (19), a light source detector (18) is disposed on the right side of the cuvette (19), and a light shielding cover (17) is disposed at one end of the light source detector (18) close to the cuvette (19). The cell (19) adopts one to advance two-out formula structure, and the bottom of cell (19) is provided with an import and an export, and the top of cell (19) is provided with an export, and the structure of leading to the most likely can guarantee that the detection liquid in cell (19) is full of, and cell (19) edge still is provided with a buckle, can guarantee not take place to deflect in the testing process and influence measurement accuracy. An ultrasonic transmitter (28) is arranged around the cuvette (19), so that clear water can transmit ultrasonic waves to clean the cuvette (19) when entering the cuvette (19) to ensure the cleanness of the cuvette (19).
The circuit and control module comprises a single chip microcomputer, an electronic touch display screen (1), a button and an electric wire, wherein the single chip microcomputer and the electric wire are arranged in the rapid tester, and the electronic touch screen and the button are arranged on the surface of the front end of the rapid tester.
In a possible implementation mode, a schematic diagram of the circuit and the control module can be as shown in fig. 1, and an electronic touch display screen (1) displays the chromium content of the sample liquid to be measured on the screen in real time. The buttons are specifically divided into the following: the power button (2) is of a contact type, an indicator light is arranged in the button, the circuit power is turned on when the button is pressed, and the indicator light is turned on. The starting button (3) is of a contact type, an indicator lamp is arranged in the button, the electronic touch display screen (1) is pressed down and turned on, and the indicator lamp is turned on when a circuit of the detection instrument enters a standby state. The pause button (4) is in a contact type, and the pause instrument is pressed to work. The cleaning button (5) is of a contact type, an indicator lamp is arranged in the button, the clear water extraction device (10) and a second micro peristaltic pump (23) in the second liquid extraction head (21) are pressed to work, and the indicator lamp is turned on. The sample injection button (6) is of a contact type and is provided with an indicator light, a first micro peristaltic pump (22) in the sample liquid extraction device (9) is pressed to work, and the indicator light is turned on.
As shown in fig. 4, the liquid pipeline and conveying module includes a sample liquid extraction device (9) and a clear water extraction device (10). One end of the sample liquid extraction device (9) is provided with a first liquid extraction head (20), and a suction nozzle of the first liquid extraction head (20) is provided with filter cotton to ensure that suspended impurities are reduced to enter the cuvette (19) to influence the final determination result. The bottom of the sample liquid extraction device (9) is provided with a rotating shaft (32), so that the sample liquid extraction device (9) can be ensured to flexibly rotate. A first micro peristaltic pump (22) is arranged inside the first liquid pumping head (20), a sample liquid circulating pipeline (25) is arranged inside the sample liquid pumping device (9), a second liquid pumping head (21) is arranged at one end of the clear water pumping device (10), a second micro peristaltic pump (23) is arranged inside the second liquid pumping head (21), and a clear water circulating pipeline (24) is arranged inside the clear water pumping device (10).
In addition, the tail end of the sample liquid circulating pipeline (25) and the tail end of the clear water circulating pipeline (24) are combined into a liquid circulating pipeline, and the tail end of the sample liquid circulating pipeline (25) is provided with a pipeline cleaning bulge (26), so that interference on the sample liquid circulating pipeline (25) is avoided when liquid is fed into the clear water circulating pipeline (24). The liquid circulation pipeline is connected with an inlet at the lower end of the cuvette (19), a first electromagnetic valve (29) is arranged in front of the inlet, an outlet at the upper end of the cuvette (19) is connected with an overflow pipe (31), an outlet at the lower end of the cuvette (19) is connected with a second electromagnetic valve (30), and the second electromagnetic valve (30) and the overflow pipe (31) are combined and connected with a liquid outlet pipe.
As shown in fig. 5, the top of the rapid analyzer is further provided with a sample liquid holding platform (33) and a clear water container placing part (34), the sample liquid holding platform (33) is arranged below the sample liquid extracting device (9), four sample liquid placing parts to be detected are arranged on the sample liquid holding platform (33), and the clear water container placing part (34) is arranged below the clear water extracting device (10).
As shown in figure 2, the left side of the rapid tester is also provided with a three-phase power supply socket (13), a circuit fusing protector (14), an RS232 communication port (d 12) of PLC and other industrial control equipment and a computer communication interface (11), and the rapid tester is connected with a computer to read and record data, so that the storage and recording of the data are simpler and more convenient.
The upper end of the liquid absorbance fixed value detection module is provided with an access cover (35), the upper end of the access cover (35) is provided with an access knob (7), and the detection cover can be opened by rotating the knob rightwards.
The embodiment of the utility model provides a following is a detection method of chrome tanning waste liquid trivalent chromium content, includes the following step:
1) calculating a chromium content-absorbance standard curve equation: respectively preparing standard chromium-containing solutions with different chromium contents by using standard chromium powder, respectively measuring the absorbance of each standard chromium-containing solution with the chromium content at 590nm by using a visible spectrophotometer to obtain corresponding data of the chromium content and the absorbance, and calculating to obtain a standard curve equation according to the corresponding data of the chromium content and the absorbance.
2) And (3) calculating the chromium content in the chrome tanning waste liquid, namely feeding the chrome tanning waste liquid with preset weight into a gauze with the aperture of 0.6mm for primary filtration, then feeding the gauze into a sand core funnel with the aperture of 4 ~ 7um for secondary filtration to obtain chrome tanning filtrate, putting the chrome tanning filtrate into a cuvette with the width of 1cm, measuring the target absorbance of the chrome tanning filtrate at 590nm by adopting a visible spectrophotometer, and calculating according to the target absorbance of the chrome tanning filtrate at 590nm and the standard curve equation obtained in the previous step to obtain the chromium content in the chrome tanning waste liquid.
Preferably, the standard curve equation is y =0.4961x-0.0024, where y is the target absorbance and x is the chromium content (g/L).
The detection method is realized based on the rapid determinator for the trivalent chromium content of the chrome tanning waste liquid, a standard curve equation for calculating the chromium content is written in a single chip microcomputer in advance, the liquid to be detected is pumped into a cuvette through a peristaltic pump in the determinator, and after a visible light detection value is stable, the chromium content is obtained through comparison of a preset standard chromium content absorbance standard curve and output.
For better explanation of the feasibility of the present invention, the following is the actual work flow of the present application:
taking four groups of chrome tanning waste liquid with a certain amount to be respectively placed in a sample liquid containing area to be detected, adjusting the position of a sample liquid extraction device (9), simultaneously taking a proper amount of deionized water to be stably placed on a clear water container placing position (34), plugging a power supply, pressing a power supply button (2), lighting an indicator lamp at the power supply button position, confirming the liquid placing position again, pressing a starting button, starting preheating a visible light emitter (16), simultaneously pressing a water inlet button, extracting the deionized water on the clear water container placing position (34) by a second micro peristaltic pump (23) in the clear water extraction device (10) to clean an internal pipeline and a cuvette (19), opening a first electromagnetic valve (29), closing a second electromagnetic valve (30), detecting the liquid level when the clear water liquid level reaches a liquid level detector (27), and starting cleaning the cuvette (19) by working of an ultrasonic emitter (28), finishing cleaning after 10s, opening a second electromagnetic valve (30), closing a second micro peristaltic pump (23), finishing discharging liquid in a pipeline after 20s through a liquid outlet (8), namely finishing preheating the visible light emitter (16), carrying out sample measurement, pressing a sample injection button 6 to extract liquid, pumping the sample liquid at a sample containing table of the sample to be measured into a sample liquid pipeline, starting a first electromagnetic valve (29) when the peristaltic pump works, closing the second electromagnetic valve (30), starting a second electromagnetic valve (30) when the liquid level in the cuvette (19) of the sample liquid for the first time reaches an overflow pipe (31), starting the second electromagnetic valve (30) after a liquid level detector (27) detects the liquid, discharging the liquid for the first time through a liquid outlet (8), closing the second electromagnetic valve (30) after 30s, opening a shading cover (17) of the detector at the moment, sensing an optical signal by a light source detector (18), processing the value, transmitting the value to a chromium content calculation analysis output part and outputting the value to an electronic touch display screen (1), at the moment, the first electromagnetic valve (29) is opened, the second electromagnetic valve (30) is closed, when the clear water liquid level reaches the liquid level detector (27) and a high liquid level is detected, the ultrasonic emitter (28) starts to clean the contrasting color dish (19), the cleaning work is finished after 10s, the second electromagnetic valve (30) is opened, the second micro peristaltic pump (23) is closed, and the cleaning liquid is discharged through the liquid outlet (8).
To sum up, in the rapid measuring instrument and the method for measuring the content of trivalent chromium in chrome tanning waste liquid provided by the utility model, the rapid measuring instrument comprises a liquid absorbance fixed value measuring module, a circuit and control module, a liquid pipeline and a conveying module; the liquid absorbance fixed value detection module comprises a cuvette, a visible light emitter, a light source detector, a shading cover and an ultrasonic emitter; the circuit and control module comprises a single chip microcomputer, an electronic touch display screen, a button and an electric wire. The liquid pipeline and conveying module comprises a sample liquid extracting device, a clear water extracting device, a liquid extracting head, a micro peristaltic pump, a sample liquid circulating pipeline, a clear water circulating pipeline, an electromagnetic valve and an overflow pipe. The rapid measuring instrument is simple in operation implementation flow, low in requirement on operators, environment-friendly in adopted detection materials and suitable for popularization and use of various tanning enterprises. In addition, the detection method corresponding to the rapid detector has small error in the detection method of the content of the trivalent chromium in the chrome tanning waste liquid, and is suitable for rapid and accurate determination.
While the invention has been described in detail in the foregoing by way of general description, and specific embodiments and experiments, it will be apparent to those skilled in the art that the invention can be modified or improved upon. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is to be understood that the invention is not limited to the precise arrangements and instrumentalities shown in the drawings and described above, and that various modifications and changes can be made without departing from the scope thereof.
Claims (4)
1. A rapid determination instrument for the content of trivalent chromium in chrome tanning waste liquid is characterized in that: the device comprises a liquid absorbance fixed value detection module, a circuit and control module, a liquid pipeline and a conveying module;
the liquid absorbance fixed value detection module comprises a cuvette, a visible light emitter is arranged on the left side of the cuvette, a light source detector is arranged on the right side of the cuvette, a light shielding cover is arranged at one end, close to the cuvette, of the light source detector, the cuvette adopts a one-inlet two-outlet structure, an inlet and an outlet are formed in the bottom end of the cuvette, an outlet is formed in the top of the cuvette, and an ultrasonic emitter is arranged around the cuvette;
the circuit and control module comprises a single chip microcomputer, an electronic touch display screen, a button and an electric wire, the single chip microcomputer and the electric wire are arranged inside the rapid tester, and the electronic touch display screen and the button are arranged on the surface of the front end of the rapid tester;
the liquid pipeline and conveying module comprises a sample liquid extracting device and a clear water extracting device, a first liquid extracting head is arranged at one end of the sample liquid extracting device, a rotating shaft is arranged at the bottom of the sample liquid extracting device, a first micro peristaltic pump is arranged inside the first liquid extracting head, a sample liquid circulating pipeline is arranged in the sample liquid extracting device, a second liquid extracting head is arranged at one end of the clear water extracting device, a second micro peristaltic pump is arranged inside the second liquid extracting head, a clear water circulating pipeline is arranged in the clear water extracting device, the tail end of the sample liquid circulating pipeline and the tail end of the clear water circulating pipeline are combined into a liquid circulating pipeline, a pipeline cleaning bulge is arranged at the tail end of the sample liquid circulating pipeline, the liquid circulating pipeline is connected with an inlet at the lower end of the cuvette, a first electromagnetic valve is arranged in front of the inlet, an outlet at the upper end of the cuvette is connected with an overflow pipe, and an outlet at the lower end of the cuvette is connected with a second electromagnetic valve, and the second electromagnetic valve and the overflow pipe are combined and connected with a liquid outlet pipe.
2. The rapid determination instrument for the content of trivalent chromium in chrome tanning waste liquid according to claim 1, characterized in that: the top of rapid survey appearance still is provided with the appearance liquid and holds platform and clear water container place the department, the appearance liquid hold the platform set up in appearance liquid draw-out device's below, the appearance liquid holds bench and is provided with four appearance liquid places departments of awaiting measuring, clear water container place the department set up in clear water draw-out device's below.
3. The rapid determination instrument for the content of trivalent chromium in chrome tanning waste liquid according to claim 1, characterized in that: the left side of the rapid tester is also provided with a three-phase power socket, a circuit fusing protector, an RS232 communication port of a PLC and a computer communication interface.
4. The rapid determination instrument for the content of trivalent chromium in chrome tanning waste liquid according to claim 1, characterized in that: the upper end of the liquid absorbance definite value detection module is provided with an access cover, the upper end of the access cover is provided with an access knob, and the detection cover can be opened by rotating the knob rightwards.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109827919A (en) * | 2019-04-15 | 2019-05-31 | 嘉兴学院 | A kind of Quick testing instrument and its detection method of chroming waste liquor trivalent chromium content |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109827919A (en) * | 2019-04-15 | 2019-05-31 | 嘉兴学院 | A kind of Quick testing instrument and its detection method of chroming waste liquor trivalent chromium content |
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