Automatic control method and system for quartz sand pickling
Through the automatic control system and method, the problem of unstable reaction parameters in the quartz sand pickling process was solved, the product quality consistency and safety were improved, and the acid consumption and production costs were reduced.
Patent Information
- Application Number
- CN202510766463.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-10
- Publication Date
- 2025-09-23
AI Technical Summary
The existing quartz sand pickling process has unstable reaction parameters, resulting in inconsistent product quality, large acid consumption, high costs and harm to workers' health.
Automatic control systems and methods are used to achieve automated control of quartz sand pickling through online detection and circulating acid concentration adjustment, including quantitative feeding, heating, detection and treatment process optimization.
It realizes the automatic control of quartz sand pickling, improves the consistency of product quality, reduces acid consumption and production costs, and improves production safety.
Smart Images
Figure CN120679770A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of quartz sand pickling, and in particular relates to an automatic control method and system for quartz sand pickling. Background Art
[0002] With the depletion of high-quality quartz sand resources, pickling has become an essential process for processing low-quality quartz sand into high-value-added products. Currently, large-scale pickling operations largely rely on manual labor, resulting in unstable control of reaction parameters such as temperature, acid concentration, and time, affecting product quality consistency. Furthermore, the traditional process relies on extensive control of acid concentration and reaction conditions, leading to high acid consumption, high costs, and significant waste. The acidic gases released by the heated acid during the pickling process also pose a serious health risk to workers. Therefore, a new automatic control system and control method are needed to address these issues. Summary of the Invention
[0003] The present invention aims to solve at least one of the technical problems existing in the prior art; To this end, the present invention proposes an automatic control method for quartz sand pickling, comprising: After the circulating acid after precipitation is heated to the predetermined temperature, a certain amount of quartz sand in the pickling reaction tank is pickled and kept warm for a set time. The processed samples are then cleaned and dried before testing for chemical composition. For products that do not meet the standards, the pickling reaction and heat preservation are continued while ensuring that the temperature of the pickling reaction tank is within the set range. Samples are taken every hour and sent to the online detection system for testing. If the test meets the standards within the set number of online test sampling, the finished sand is cleaned, dehydrated, dried, and then put into storage; If the sampling test fails within the set number of times, the concentration of useful components in the circulating acid is increased, and the circulating acid is sent to the pickling reaction tank after heating, and the above steps are repeated until the product meets the standards.
[0004] Furthermore, the circulating acid is heated by a circulating acid pump through a heat exchanger and then fed into the pickling reaction tank.
[0005] Furthermore, when the circulating acid enters the pickling reaction tank and the liquid level reaches the lower limit, it stops; Then, a quantitative amount of quartz sand is fed into the pickling reaction tank with the help of a quantitative feeder.
[0006] Furthermore, after the feeding is completed, the circulating acid pump re-feeds acid into the pickling reaction tank. After the acid is fed, it undergoes precipitation and is then heated by the circulating acid pump through the heat exchanger and re-enters the pickling reaction tank. After the circulating acid temperature reaches the set temperature and the liquid level reaches the upper limit, the circulating acid pump stops working and the quartz sand in the pickling reaction tank undergoes pickling and insulation operations for the set time.
[0007] Furthermore, after the acid is added to the pickling reaction tank, it overflows from the top to the overflow weir and then enters the precipitation tank for precipitation. After precipitation, it overflows from the top of the precipitation tank and enters the acid return tank, and then the circulating acid pump completes the circulation of the circulating acid.
[0008] Furthermore, for products that do not meet the standards, and the temperature in the pickling reaction tank is lower than the lower limit of the set value, the circulating acid pump is started at this time, and the circulating acid is continued to be heated through the heat exchanger and fed into the pickling reaction tank for temperature increase circulation until the temperature reaches the standard, and then the pickling reaction is carried out at a heat preservation temperature; If the temperature of the pickling reaction tank is greater than the lower limit of the equipment value, continue the pickling reaction insulation.
[0009] Furthermore, the concentration of useful components in the cyclic acid is increased by starting the prepared acid metering pump to quantitatively deliver new acid to the circulating acid tank. The circulating acid pump is started to heat the new acid liquid through the heat exchanger and then deliver it to the pickling reaction tank.
[0010] An automatic control system for quartz sand pickling, which is used to implement the above method, specifically includes: Raw material storage and weighing module, used for storing raw materials and quantitative feeding; Pickling module, used for heat-insulating pickling of quartz sand; Acid mist absorption module, acid mist absorption module, is used to absorb and neutralize the volatilized acid mist and to drain the acid gas in the tank during tank maintenance; New acid configuration module, used to configure new circulating acid; A heating module, used for heating the circulating acid; Finished sand cleaning and dehydration module, used for cleaning, dehydrating and drying finished sand; Online detection module, used to detect the composition of quartz sand.
[0011] Furthermore, the raw material storage and weighing module includes a silo and a quantitative feeder; The pickling module includes a pickling reaction tank, a liquid level gauge, a thermometer, and a valve installed on the device. The top of the pickling reaction tank is provided with an acid inlet, a water inlet, and a sampling port; A circulating acid treatment module, including a sedimentation tank, an acid return tank, a sewage pump, a circulating acid pump, a level gauge and a temperature meter installed on the acid return tank, and a heat exchanger installed inside the acid return tank; Fresh acid preparation module, including acid storage tank, raw acid metering pump, acid preparation tank and stirring device, prepared acid storage tank, prepared acid metering pump; The online detection module includes a cleaning machine, a dehydrating machine, a drying machine, and an online component analyzer; The finished sand cleaning and dewatering module includes a cleaning machine, a dewatering machine, and a belt conveyor.
[0012] Compared with the prior art, the present invention has the following beneficial effects: The quartz sand pickling solution provided in the present application can realize automatic control, does not require human supervision, has a high degree of automation, improves production efficiency and production safety, and saves human resources; at the same time, it can ensure the final quality of the quartz sand, avoid the occurrence of unqualified products, and can make targeted adjustments for unqualified situations, thereby improving the pass rate of quartz sand after pickling; the present invention is simple, effective, and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a structural block diagram of the control system of the present invention; Figure 2 This is a flow chart of the automatic control method of the present invention. DETAILED DESCRIPTION
[0014] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all 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.
[0015] See also Figure 1-Figure 2 , the present application provides an automatic control method for pickling of quartz sand; As the first embodiment of the present application, the method in this embodiment specifically includes the following steps: After the circulating acid after precipitation is heated to the predetermined temperature, a certain amount of quartz sand in the pickling reaction tank is pickled and kept warm for a set time. The processed samples are then cleaned and dried before testing for chemical composition. For products that do not meet the standards, the pickling reaction and heat preservation are continued while ensuring that the temperature of the pickling reaction tank is within the set range. Samples are taken every hour and sent to the online detection system for testing. If the test meets the standards within the set number of online test sampling, the finished sand is cleaned, dehydrated, dried, and then put into storage; If the sampling test fails within the set number of times, the concentration of useful components in the circulating acid is increased, and the circulating acid is sent to the pickling reaction tank after heating, and the above steps are repeated until the product meets the standards.
[0016] As a second embodiment of the present application, the method specifically includes the following steps: Step 1: Preset the processing parameters of qualified products in the controller. The processing parameters include chemical composition index, pulp concentration in the pickling reaction tank, temperature, heating time, holding time, holding temperature critical value, holding temperature critical value including holding temperature upper limit and holding temperature lower limit, upper limit and lower limit of the pickling reaction tank liquid level gauge, and number of online detection sampling; Step 2: When the quartz sand pickling production line is working, the circulating acid pump starts, and the circulating acid is heated by the heat exchanger and then sent into the pickling reaction tank. When the liquid level reaches the lower limit, the circulating acid pump stops and the acid inlet valve is closed. Start the quantitative feeder of the raw material. When the weighing amount reaches the set value, stop feeding and close the feed inlet valve; The circulating acid pump starts and the valve is opened to continue adding acid. When the acid is full, it will overflow from the top of the pickling reaction tank and enter the overflow weir, then flow into the sedimentation tank in the circulating acid treatment module for precipitation, and then overflow from the top of the sedimentation tank into the acid return tank, and then be transported by the circulating acid pump to the pickling reaction tank for circulation after being heated by the heat exchanger.
[0017] When the temperature gauge value in the pickling reaction tank reaches the preset temperature and the liquid level reaches the upper limit set by the pickling reaction tank level gauge, the circulating acid pump stops working, the valve at the acid inlet at the bottom of the pickling reaction tank is closed, and the quartz sand in the pickling reaction tank enters the pickling insulation operation. When the insulation time reaches the set value, the sampling valve at the top of the pickling reaction tank is opened, and the sampling spoon is inserted into the sample to take the sample. The sample is then transported to the cleaning machine for cleaning, flows into the dehydration equipment by gravity for dehydration and drying, and then the chemical composition is analyzed by the online detector.
[0018] If the standards are met, the controller will control the bottom discharge valve to open, and the material will be transported to the finished sand cleaning and dehydration module for processing and then put into storage; If the temperature does not meet the standard and the temperature in the pickling reaction tank is lower than the lower limit of the set range, the circulating acid pump will start, and the acid solution will continue to be heated by the heat exchanger and fed into the reaction tank for temperature rise circulation until the temperature reaches the standard. The circulating acid pump and valve will be closed to carry out the heat preservation pickling reaction in the reaction tank. If the temperature of the pickling reaction tank is greater than the lower limit of the equipment value, the pickling reaction will continue to be kept warm, and samples will be taken every hour to enter the online detection module for detection. Within the set number of online detection sampling, if the detection meets the standard, it will enter the finished sand cleaning and dehydration module; If the sampling test still fails within the set number of times, start the acid metering pump in the new acid preparation module to quantitatively deliver the new acid to the circulating acid tank to increase the concentration of useful components in the circulating acid. Start the circulating acid pump to heat the new acid liquid through the heat exchanger and send it to the pickling reaction tank. Repeat the heating, insulation and testing operations until the product meets the standards and enters the finished sand cleaning and dehydration module.
[0019] An automatic control system for quartz sand pickling, used to implement the above-mentioned automatic control method to achieve automatic control of quartz sand pickling; specifically comprising: Raw material storage and weighing module, including silos and quantitative feeders; The pickling module includes a pickling reaction tank, a liquid level gauge, a thermometer, and a valve installed on the device. The top of the pickling reaction tank is provided with an acid inlet, a water inlet, and a sampling port; A circulating acid treatment module, including a sedimentation tank, an acid return tank, a sewage pump, a circulating acid pump, a level gauge and a temperature meter installed on the acid return tank, and a heat exchanger installed inside the acid return tank; The acid mist absorption module is used to absorb and neutralize the acid mist emitted from the reaction tank, acid storage tank, etc. to avoid environmental pollution. It is also used to drain the acid gas in the tank during tank maintenance to facilitate maintenance operations; Fresh acid preparation module, including acid storage tank, raw acid metering pump, acid preparation tank and stirring device, prepared acid storage tank, prepared acid metering pump; The online detection module includes a cleaning machine, a dehydrating machine, a drying machine, and an online component analyzer; The finished sand cleaning and dewatering module includes a cleaning machine, a dewatering machine, a belt conveyor, etc.
[0020] The above embodiments are only used to illustrate the technical method of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.
Claims
1. An automatic control method for pickling quartz sand, characterized in that: include: After the circulating acid after precipitation is heated to the predetermined temperature, a certain amount of quartz sand in the pickling reaction tank is pickled and kept warm for a set time. The processed samples are then cleaned and dried before testing for chemical composition. For products that do not meet the standards, the pickling reaction and heat preservation are continued while ensuring that the temperature of the pickling reaction tank is within the set range. Samples are taken every hour and sent to the online detection system for testing. If the test meets the standards within the set number of online test sampling, the finished sand is cleaned, dehydrated, dried, and then put into storage; If the sampling test fails within the set number of times, the concentration of useful components in the circulating acid is increased, and the circulating acid is sent to the pickling reaction tank after heating, and the above steps are repeated until the product meets the standards.
2. The automatic control method for quartz sand pickling according to claim 1, characterized in that: The circulating acid is heated by the circulating acid pump through the heat exchanger and then sent into the pickling reaction tank.
3. The automatic control method for quartz sand pickling according to claim 2, characterized in that: When the circulating acid enters the pickling reaction tank and the liquid level reaches the lower limit, stop; Then, a quantitative amount of quartz sand is fed into the pickling reaction tank with the help of a quantitative feeder.
4. The automatic control method for quartz sand pickling according to claim 3 is characterized in that: After the feeding is completed, the circulating acid pump re-feeds acid into the pickling reaction tank. After the acid is fed, it is precipitated and then heated by the circulating acid pump through the heat exchanger before re-entering the pickling reaction tank. After the circulating acid temperature reaches the set temperature and the liquid level reaches the upper limit, the circulating acid pump stops working and the quartz sand in the pickling reaction tank is pickled and kept warm for the set time.
5. The automatic control method for quartz sand pickling according to claim 4 is characterized in that: After the acid is added to the pickling reaction tank, it overflows from the top to the overflow weir and then enters the sedimentation tank for precipitation. After precipitation, it overflows from the top of the sedimentation tank and enters the acid return tank, and then the circulating acid pump completes the circulation of the circulating acid.
6. The automatic control method for quartz sand pickling according to claim 1, characterized in that: For products that do not meet the standards, and the temperature in the pickling reaction tank is lower than the lower limit of the set value, the circulating acid pump is started at this time, and the circulating acid is continued to be heated through the heat exchanger and fed into the pickling reaction tank for temperature rise circulation until the temperature reaches the standard, and then the pickling reaction is carried out in an insulated state; If the temperature of the pickling reaction tank is greater than the lower limit of the equipment value, continue the pickling reaction insulation.
7. The automatic control method for quartz sand pickling according to claim 1, characterized in that: To increase the concentration of useful components in the cyclic acid, the new acid is quantitatively delivered to the circulating acid tank by starting the acid metering pump. The circulating acid pump is started to heat the new acid liquid through the heat exchanger and then deliver it to the pickling reaction tank.
8. An automatic control system for quartz sand pickling, characterized in that: The system is used to implement the method described in any one of claims 1 to 7, specifically comprising: Raw material storage and weighing module, used for storing raw materials and quantitative feeding; Pickling module, used for heat-insulating pickling of quartz sand; Acid mist absorption module is used to absorb and neutralize the volatilized acid mist and to drain the acid gas in the tank during tank maintenance; New acid configuration module, used to configure new circulating acid; A heating module, used for heating the circulating acid; Finished sand cleaning and dehydration module, used for cleaning, dehydrating and drying finished sand; Online detection module, used to detect the composition of quartz sand.
9. The automatic control system for quartz sand pickling according to claim 8, characterized in that: Raw material storage and weighing module, including silos and quantitative feeders; The pickling module includes a pickling reaction tank, a liquid level gauge, a thermometer, and a valve installed on the device. The top of the pickling reaction tank is provided with an acid inlet, a water inlet, and a sampling port; A circulating acid treatment module, including a sedimentation tank, an acid return tank, a sewage pump, a circulating acid pump, a level gauge and a temperature meter installed on the acid return tank, and a heat exchanger installed inside the acid return tank; Fresh acid preparation module, including acid storage tank, raw acid metering pump, acid preparation tank and stirring device, prepared acid storage tank, prepared acid metering pump; The online detection module includes a cleaning machine, a dehydrating machine, a drying machine, and an online component analyzer; The finished sand cleaning and dewatering module includes a cleaning machine, a dewatering machine, and a belt conveyor.