Method for purifying high-purity quartz sand based on multi-parameter fusion

Abstract

This invention relates to the field of quartz sand purification technology, and particularly to a high-purity quartz sand purification method based on multi-parameter fusion. The method first determines whether to proceed to the first flotation purification stage based on a comparison between the particle size index value of the mixture of particles to be purified and a particle size index threshold. If it is determined not to proceed, a second crushing is initiated. If it is determined to proceed, the first impurity removal rate is determined based on the dataset after the first flotation and compared with the first impurity removal threshold to determine whether to proceed to the first acid washing purification stage. If it is determined not to proceed, a second flotation purification stage is initiated. If it is determined to proceed, the second impurity removal rate is determined based on the dataset after the first acid washing and compared with the second impurity removal threshold to determine whether purification is complete. If not, a second acid washing purification stage is initiated. This invention enables dynamic determination and precise control of the quartz sand purification process, effectively improving the purification efficiency of high-purity quartz sand.

Description

Technical Field

[0001] This invention relates to the field of quartz sand purification technology, and in particular to a method for purifying high-purity quartz sand based on multi-parameter fusion. Background Technology

[0002] High-purity silica sand refers to silica sand products with a silica content as high as 99.99%. It possesses extremely high chemical stability, an extremely low coefficient of expansion, and excellent electrical insulation properties, and is mainly used in photovoltaics, optical fibers, and semiconductors. Current high-purity silica sand purification methods suffer from technical problems such as cumbersome purification steps and low purification levels.

[0003] Chinese Patent Publication No. CN115724431A discloses a method for purifying quartz sand. The related technical solution includes steps of sorting, acid washing, water washing, color sorting, and packaging of quartz sand. Sorting is used to prepare the particle size of quartz sand and partially remove magnetic properties. Acid washing is used to dissolve and remove impurities. Water washing is used to thoroughly remove residual acid and soluble reaction products from the surface and pores of quartz sand and dry it to obtain a stable semi-finished quartz sand product. Color sorting and packaging is used to separate the particle size of quartz sand, completing sorting, particle size adjustment, and packaging. However, this technical solution, which is based on physical processing and a single acid washing step, lacks key control parameters and quality monitoring feedback points for key nodes in the entire process when purifying quartz sand, thus affecting the purification process of high-purity quartz sand and resulting in low purification efficiency.

[0004] Therefore, there is an urgent need for a high-purity quartz sand purification method that can set key control parameters for the purification process and make targeted adjustments based on quality monitoring feedback points, thereby improving the purification efficiency of high-purity quartz sand. Summary of the Invention

[0005] To address this issue, the present invention provides a high-purity quartz sand purification method based on multi-parameter fusion, which overcomes the problem in the prior art of setting key control parameters in the purification process and making targeted adjustments based on quality monitoring feedback points, thereby reducing the purification efficiency of high-purity quartz sand.

[0006] To achieve the above objectives, the present invention provides a method for purifying high-purity quartz sand based on multi-parameter fusion, comprising:

[0007] The raw quartz ore was first crushed, and the particle size index value was determined based on the data characteristics obtained from the first crushing.

[0008] Based on the comparison result between the particle size index value and the particle size index threshold, it is determined whether to enter the first flotation purification, and if it is determined that the first flotation purification is not to be entered, the second crushing is started based on the particle size index value.

[0009] The first impurity removal rate and the first key element retention rate are determined based on the data characteristics obtained from the first flotation purification.

[0010] Based on the comparison result between the first impurity removal rate and the first impurity removal threshold, it is determined whether to enter the first acid washing purification, and if it is determined that the first acid washing purification is not to be entered, the second flotation purification is started based on the first impurity removal rate.

[0011] The initial parameters for the second flotation purification are determined based on the first impurity removal rate, and the adjustment range of the initial parameters for the second flotation purification is determined based on the first key element retention rate. The initial parameters include the initial magnetic field strength and the initial collector addition amount.

[0012] The removal rate of the second impurity and the retention rate of the second key element were determined based on the data characteristics obtained from the first acid washing and purification.

[0013] The system determines whether purification is complete based on the comparison between the second impurity removal rate and the second impurity removal threshold, and if purification is not complete, it initiates a second acid washing purification based on the second impurity removal rate.

[0014] The initial parameters for the second acid leaching purification are determined based on the second impurity removal rate, and the adjustment range of the initial parameters for the second acid leaching purification is determined based on the second key element retention rate. The initial parameters include the initial acid concentration and the initial reaction time.

[0015] Furthermore, the determination of whether to proceed to the first flotation purification stage based on the comparison result between the particle size index value and the particle size index threshold includes:

[0016] If the particle size index value is less than or equal to the particle size index threshold, it is determined that the current particle mixture to be purified meets the flotation requirements, and it is determined to enter the first flotation purification.

[0017] If the particle size index value is greater than the particle size index threshold, it is determined that the current mixture of particles to be purified does not meet the flotation requirements, and a second crushing is initiated based on the particle size index value.

[0018] Furthermore, initiating the second crushing based on the particle size index value includes:

[0019] The particle size distribution value is determined based on the particle size index value;

[0020] Based on the comparison between the particle size distribution value and the preset particle size distribution value, the crushing intensity of the crusher in the second crushing is increased, wherein the increase in crushing intensity is positively correlated with the particle size distribution value.

[0021] The crushing strength in the first crushing stage is used as the initial crushing strength when the crusher is increased and adjusted in the second crushing stage.

[0022] Further, the step of determining whether to proceed to the first acid washing purification based on the comparison result between the first impurity removal rate and the first impurity removal threshold includes:

[0023] If the first impurity removal rate is less than or equal to the first impurity removal threshold, it is determined that the purity of the mixture after the first flotation does not meet the flotation purification requirements, and a second flotation purification is initiated based on the first impurity removal rate.

[0024] If the first impurity removal rate is greater than the first impurity removal threshold, it is determined that the purity of the mixture after the first flotation meets the flotation purification requirements, and it is determined to proceed to the first acid washing purification.

[0025] Furthermore, the process of determining the initial parameters for the second flotation purification based on the first impurity removal rate includes:

[0026] The first impurity removal difference is calculated based on the difference between the first impurity removal threshold and the first impurity removal rate.

[0027] The initial parameters for the second flotation purification are determined based on the difference in the removal of the first impurity, and the initial parameters for the second flotation purification are positively correlated with the difference in the removal of the first impurity.

[0028] Furthermore, the process of determining the adjustment amplitude of the initial parameters for the second flotation purification based on the retention rate of the first key element includes:

[0029] The initial parameters for the second flotation purification are increased based on the comparison between the retention rate of the first key element and the preset retention rate of the first key element. The increase in the initial magnetic field strength and the initial amount of collector added are both positively correlated with the retention rate of the first key element.

[0030] Furthermore, the process of determining whether the quartz sand purification is complete based on the comparison result between the second impurity removal rate and the second impurity removal threshold includes:

[0031] If the removal rate of the second impurity is less than or equal to the removal threshold of the second impurity, it is determined that the purity of the mixture after the first acid washing and purification does not meet the acid washing and purification requirements, and the second acid washing and purification is started based on the removal rate of the second impurity.

[0032] If the removal rate of the second impurity is greater than the removal threshold of the second impurity, it is determined that the purity of the mixture after the second acid washing and purification meets the acid washing and purification requirements, and the quartz sand purification process is completed.

[0033] Furthermore, the process of determining the initial parameters for the second acid washing purification based on the second impurity removal rate includes:

[0034] The second impurity removal difference is calculated based on the difference between the second impurity removal threshold and the second impurity removal rate;

[0035] The initial parameters for the second acid leaching purification are determined based on the difference in the removal of the second impurity, and the initial parameters for the second acid leaching purification are positively correlated with the difference in the removal of the second impurity.

[0036] Furthermore, the process of determining the adjustment amplitude of the initial parameters for the second acid leaching purification based on the retention rate of the second key element includes:

[0037] The initial parameters of the second acid washing purification are adjusted based on the comparison between the retention rate of the second key element and the preset retention rate of the second key element. The decrease in the initial acid concentration and the extension of the initial reaction time are both positively correlated with the retention rate of the second key element.

[0038] Furthermore, after determining that the quartz sand purification process is complete or the second acid washing purification is initiated, the process also includes data feedback and threshold optimization steps:

[0039] Based on the relevant dataset finally obtained from the current purification batch, at least one of the first impurity removal threshold and the second impurity removal threshold is dynamically calibrated;

[0040] The dynamic calibration process includes: comparing the content of key flotation impurities detected in the final quartz sand with the content of key flotation target impurities, and adjusting the first impurity removal threshold based on the comparison result;

[0041] The content of key impurities detected in the final quartz sand is compared with the content of key impurities in the pickling target, and the second impurity removal threshold is adjusted based on the comparison results.

[0042] Compared with existing technologies, the high-purity quartz sand purification method based on multi-parameter fusion of the present invention has the following advantages: It uses multi-source sensors to collect in real-time particle size index values ​​and key impurity content data corresponding to different purification stages of the particle mixture to be purified. This allows for the determination of the execution conditions and effects of each purification step based on real-time data. The method determines whether to proceed to the first flotation purification stage based on the comparison between the particle size index value and the particle size index threshold. If it is determined not to proceed, a second crushing operation is initiated with intelligent adjustment of the crushing intensity, thereby achieving intelligent crushing. If it is determined to proceed, after completing the first flotation purification, the method determines whether to proceed to the first acid washing purification stage based on the comparison between the first impurity removal rate and the first impurity removal threshold. If it is determined not to proceed, a second flotation purification stage is initiated with dynamic optimization of flotation parameters, thereby achieving intelligent flotation. If it is determined to proceed, after completing the first acid washing purification, the method determines whether purification is complete based on the comparison between the second impurity removal rate and the second impurity removal threshold. If not, a second acid washing purification stage is initiated with precise adjustment of acid washing conditions, thereby achieving intelligent acid washing. This setup allows for targeted determination of each purification path and dynamic adjustment of corresponding process parameters based on real-time data from each stage of the purification process. This enables closed-loop intelligent control and precise optimization of process parameters for the quartz sand purification process, thereby effectively improving purification efficiency.

[0043] Furthermore, this invention establishes a positive correlation between the adjustment range of crushing intensity and the particle size distribution value, enabling the second crushing to specifically enhance and adjust the crushing intensity to quickly meet the flotation particle size requirements, thus avoiding ineffective crushing and energy waste, and improving the efficiency of the crushing process.

[0044] Furthermore, the present invention also dynamically determines the initial parameters for the second flotation purification based on the difference in the removal rate of the first impurity when the first impurity removal rate fails to meet the standard, and further determines the adjustment range of the initial parameters in combination with the retention rate of the first key element, thereby realizing multi-objective optimization of impurity removal and target mineral recovery during the flotation process, and ensuring the recovery rate of the target mineral while improving the impurity removal effect.

[0045] Furthermore, this invention also dynamically determines the initial parameters for the second acid leaching purification based on the difference in the removal rate of the second impurity when the removal rate of the second impurity does not meet the standard, and further determines the adjustment range of the initial parameters in combination with the retention rate of the second key element. This achieves multi-objective optimization of impurity removal and target mineral recovery during the acid leaching process, which can minimize the excessive erosion of silica in quartz sand by acid, and ensure the purity and yield of the final product while efficiently removing residual impurities.

[0046] Furthermore, this invention also sets up data feedback and threshold optimization steps. Based on the impurity content data of the final purified product, it dynamically calibrates the first impurity removal threshold and the second impurity removal threshold set in the system. This enables the purification process to adapt to the fluctuations of different batches of raw materials, optimizes the purification process of subsequent batches of quartz sand, and thus achieves self-learning and continuous optimization of the purification process standard. This improves the stability and adaptability of the entire purification process in the long term, thereby continuously improving the purification efficiency of high-purity quartz sand. Attached Figure Description

[0047] Figure 1 This is a block diagram of a module used to implement a high-purity quartz sand purification method based on multi-parameter fusion in an embodiment of the present invention;

[0048] Figure 2 This is a schematic diagram of the process for purifying high-purity quartz sand based on multi-parameter fusion in an embodiment of the present invention.

[0049] Figure 3 This is a flowchart illustrating the process of adjusting the initial parameters for the second flotation purification based on the comparison between the retention rate of the first key element and the preset retention rate of the first key element in an embodiment of the present invention.

[0050] Figure 4 This is a flowchart illustrating the process of determining the initial acid concentration and initial reaction time based on a comparison between the difference in the removal of the second impurity and a preset difference in the removal of the second impurity in an embodiment of the present invention. Detailed Implementation

[0051] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0052] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0053] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0054] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] Please see Figure 1 As shown, it is a block diagram of a module for implementing a high-purity quartz sand purification method based on multi-parameter fusion in an embodiment of the present invention.

[0056] This embodiment includes a crushing module, a purification module, a multi-source sensing module, a data processing module, a decision analysis module, and a control module.

[0057] The crushing module includes a crusher for multi-stage crushing of raw quartz ore; the purification module is connected to the crushing module and includes a multi-stage flotation purification unit and a multi-stage acid washing purification unit for purifying the mixture of particles to be purified. The multi-stage flotation purification unit includes a magnetic separator and a flotation machine, and the multi-stage acid washing purification unit includes an acid-resistant reactor and a high-efficiency solid-liquid separation device.

[0058] The multi-source sensing module is connected to both the crushing and purification modules. It includes several multi-source sensors used to collect relevant data from the crushing and purification processes to obtain relevant datasets. The data processing module is connected to the multi-source sensing module and processes the data based on the datasets to obtain particle size index values, the first impurity removal rate, the second impurity removal rate, the first key element retention rate, and the second key element retention rate. The decision analysis module is connected to the data processing module. It determines whether to proceed to the first flotation purification stage based on the comparison between the particle size index value and the particle size index threshold; whether to proceed to the first acid leaching purification stage based on the comparison between the first impurity removal rate and the first impurity removal threshold; and whether purification is complete based on the comparison between the second impurity removal rate and the second impurity removal threshold. If the first acid leaching purification stage is not initiated, the second flotation purification stage is started based on the first impurity removal rate, and the initial parameters for the second flotation purification stage are determined. If purification is not complete, the second acid leaching purification stage is started based on the second impurity removal rate, and the initial parameters for the second acid leaching purification stage are determined. The adjustment range of the initial parameters for the second flotation purification stage is determined based on the retention rate of the first key element, and the adjustment range of the initial parameters for the second acid leaching purification stage is determined based on the retention rate of the second key element. The control module is connected to the decision analysis module, the crushing module, and the purification module, respectively. It controls the crushing module or the purification module to perform corresponding actions based on the determination results to complete the control.

[0059] Data sets related to the crushing and purification process of quartz sand were acquired using multi-source sensors. These data sets included particle size index values ​​corresponding to the mixture of particles to be purified, as well as several key impurities and their corresponding contents at different purification stages.

[0060] Specifically, the multi-source sensors include an online laser-induced breakdown spectrometer and an online laser particle size analyzer, used for real-time compositional analysis of the ore raw materials to obtain particle size index values ​​corresponding to the purified particle mixture, as well as several key impurities and their corresponding contents at different purification stages. Specifically, key impurities identified for removal during flotation purification include feldspar, mica, iron-bearing minerals, and other light silicate minerals, and are recorded as flotation key impurities. Key impurities identified for removal during acid leaching purification include lattice impurity ions such as iron, aluminum, and titanium, alkali metal ions, and amorphous silica or silicates, and are recorded as acid leaching key impurities. Simultaneously, the online laser-induced breakdown spectrometer is used to determine the content percentage of various key impurities and silica in this batch of quartz sand.

[0061] Please see Figure 2 The diagram shown is a flowchart illustrating a high-purity quartz sand purification method based on multi-parameter fusion in an embodiment of the present invention. The process in this embodiment includes at least the following steps:

[0062] S1: Perform the first crushing of the raw quartz ore and determine the particle size index value based on the data characteristics obtained from the first crushing;

[0063] S2: Determine whether to proceed to the first flotation purification based on the comparison result between the particle size index value and the particle size index threshold, and start the second crushing based on the particle size index value if it is determined that the first flotation purification will not be carried out.

[0064] Specifically, the median particle size D50 and the top particle size D90 of the mixture of particles to be purified are obtained; then, the particle size index value M is obtained by weighted calculation based on the median particle size D50 and the top particle size D90. The calculation process is M=a1×D50+a2×D90; where a1 and a2 are the weight coefficients corresponding to the median particle size D50 and the top particle size D90, respectively, and a1+a2=1.

[0065] Among them, the median particle size D50 is the average size of the mixture of particles to be purified, which determines the overall coarseness of the sand particles and will affect the reaction efficiency of subsequent flotation and acid washing.

[0066] The top particle size D90 is the coarse particle end of the particle mixture to be purified, describing the particle size distribution of quartz sand, and is a key indicator affecting product performance or process.

[0067] Furthermore, this embodiment can calculate the particle size index value M based on the median particle size D50 and the top particle size D90, which can be used to determine whether to enter the first flotation purification.

[0068] Based on the high-purity quartz sand particle size standard, several weighting coefficients are determined when calculating the particle size index value M. For example, a1=0.35 and a2=0.65 are set to obtain the particle size index value M.

[0069] In one specific embodiment, a preset particle size index value M0 is set in advance and compared with the particle size index value M. The preset particle size index value M0 is determined based on the statistical correlation of historical production data. Specifically, under stable raw material sources and pretreatment processes, historical batch data is collected, and batches of high-purity quartz sand that meet the final product particle size and purity standards are selected. The particle size index value M data calculated before these batches enter the first flotation purification process is extracted to form a qualified sample set. By calculating the upper limit or a specific quantile (such as the 95th percentile) of this sample set, the obtained statistical value is established as the preset particle size index value M0. M0 can be used to determine the relative proportion of particle size in this batch of quartz sand. For example, M0 can be set to 200 μm. The process of comparing the particle size index value M with the preset particle size index value M0 is as follows:

[0070] If M is less than or equal to M0, it indicates that the calculated particle size index value is small, and the D50 and D90 of the particles are both small. This means that the overall particle size of the mixture to be purified is fine, with a low content of coarse particles. The overall particle size of the current mixture to be purified has reached the preset standard, and its particle size distribution is suitable for flotation separation. Therefore, it is determined that the current mixture to be purified meets the flotation requirements, and thus it is determined to proceed to the first flotation purification. If M is greater than M0, it indicates that the calculated particle size index value is large, and the D50 or D90 of the particles is large. This means that the overall particle size of the mixture to be purified is too coarse, or the coarse particle size is too large. The particle size distribution of the current mixture to be purified has deviated from the optimal range, and the excessive content of coarse particles affects the monomer liberation and separation efficiency. Therefore, it is not suitable to directly carry out the first flotation purification. Thus, it is determined to start the second crushing, and the second crushing is started based on the particle size index value M, so that the mixture to be purified after the second crushing can meet the requirements for entering the first flotation purification.

[0071] Furthermore, when determining to start the second crushing, the particle size distribution value D is determined based on the particle size index value M, specifically calculated based on D=D90 / D50.

[0072] In one specific embodiment, a preset particle size distribution value D0 is set in advance and compared with the particle size distribution value D, and then the increase in crushing intensity of the crusher in the second crushing is determined based on the comparison result. The crushing intensity of the crusher in the first crushing is used as the initial crushing intensity when adjusting the crushing intensity increase in the second crushing.

[0073] When the particle size distribution value D is larger, the corresponding top particle size D90 is significantly larger, or the median particle size D50 may be within a reasonable range or larger, indicating that the proportion of coarse particles in the material is higher, and the particle size distribution is wider or more uneven. This makes the particle mixture unsuitable for purification. To obtain a more uniform particle size distribution and reduce the number of coarse particles, stronger crushing intensity is required for more thorough crushing. Therefore, the crushing intensity in the second crushing increases with the increase of the particle size distribution value D. The preset particle size distribution value D0 is determined based on the statistical correlation of historical production data. Specifically, under stable process parameters, historical batch data is collected, batches of finished high-purity quartz sand that meet the performance standards are selected, and the particle size distribution value D corresponding to these batches at the second crushing decision point is extracted to form a qualified sample set. By calculating the upper limit or a specific quantile (such as the 95th percentile) of the sample set, the obtained statistical value is established as the preset particle size distribution value D0. To more accurately determine the increase in crushing intensity during the second crushing, the preset particle size distribution value D0 can be divided into a first preset particle size distribution value D1 and a second preset particle size distribution value D2. For example, D1=1.8 and D2=2.2. The process of determining the increase in crushing intensity based on the comparison between the particle size distribution value D and the first preset particle size distribution value D1 and the second preset particle size distribution value D2 is as follows:

[0074] If D is less than or equal to D1, a first crushing strength adjustment command is generated to increase the crushing strength corresponding to the second crushing to 1.2 times the initial crushing strength; wherein, if the initial crushing strength is set to 50 MPa, the increased crushing strength is 60 MPa. If D is greater than D1 and less than or equal to D2, a second crushing strength adjustment command is generated to increase the crushing strength corresponding to the second crushing to 1.4 times the initial crushing strength. If D is greater than D2, a third crushing strength adjustment command is generated to increase the crushing strength corresponding to the second crushing to 1.6 times the initial crushing strength.

[0075] It should be noted that the increase in crushing intensity during the second crushing process is within the maximum safe threshold range of the crusher.

[0076] S3: Determine the first impurity removal rate and the first key element retention rate based on the data characteristics obtained from the first flotation purification;

[0077] Specifically, the process involves obtaining several key impurities and their corresponding contents after the first flotation purification process. During flotation purification, key impurities include feldspar, mica, iron-bearing minerals, and other light silicate minerals. The content of key flotation impurities in the quartz sand ore before the first flotation purification is tested to determine the initial flotation impurity content, and the content of key flotation impurities in the quartz sand ore after the first flotation purification is tested to determine the first flotation impurity content. Finally, the removal rate R1 of the first impurity is calculated based on the ratio of the first flotation impurity content to the initial flotation impurity content, where R1 = (initial flotation impurity content - first flotation impurity content) / initial flotation impurity content. The flotation impurity content is the average of the contents of several key impurities before or after the first flotation purification.

[0078] Furthermore, the content percentage of silica in this batch of quartz sand before the first flotation purification process and the content percentage of silica after the first flotation purification process are obtained. Based on the ratio of the content percentage of silica after the first flotation purification process to the content percentage of silica before the first flotation purification process in this batch of quartz sand, the retention rate of the first key element C1 is calculated, where C1 = content percentage of silica after the first flotation purification process / content percentage of silica before the first flotation purification process.

[0079] S4: Determine whether to proceed to the first acid washing purification based on the comparison result between the first impurity removal rate and the first impurity removal threshold, and start the second flotation purification based on the first impurity removal rate if it is determined that the first acid washing purification is not to proceed.

[0080] Specifically, a first impurity removal threshold R10 is pre-set and compared with the first impurity removal rate R1. The comparison result then determines whether to proceed to the first acid washing purification stage. The determination of the first impurity removal threshold R10 is based on the statistical correlation of historical quartz sand flotation purification data. Specifically, under stable first flotation purification process parameters, historical batch data is collected, batches whose final quartz sand purity meets the standard are selected, and the corresponding first impurity removal rate R1 data for these batches is extracted to form a qualified sample set. By calculating the lower limit or a specific quantile (such as the 5th percentile) of this sample set, the obtained statistical value is established as the first impurity removal threshold R10. For example, R10 can be set to 90%. The process of comparing the first impurity removal rate R1 with the first impurity removal threshold R10 is as follows:

[0081] If R1 is less than or equal to R10, it indicates that the selective separation of the mixture in the first flotation purification process is insufficient, and the content of key flotation impurities in the current quartz sand is still too high. Therefore, it is determined that the purity of the mixture after the first flotation does not meet the flotation purification requirements, and thus it is determined to start the second flotation purification based on the first impurity removal rate R1 to enhance the flotation purification efficiency.

[0082] If R1 is greater than R10, it indicates that the first flotation purification process has achieved the target of removing key impurities in flotation, and the purity of the mixture meets the requirements for entering the first acid washing purification, thus starting the first acid washing purification.

[0083] S5: Determine the initial parameters for the second flotation purification based on the first impurity removal rate, and determine the adjustment range of the initial parameters for the second flotation purification based on the first key element retention rate, wherein the initial parameters include the initial magnetic field strength and the initial collector addition amount;

[0084] Furthermore, when determining to start the second flotation purification, the difference between the first impurity removal threshold R10 and the first impurity removal rate R1 is calculated to obtain the first impurity removal difference X1, and the initial parameters for the second flotation purification are determined based on the first impurity removal difference X1, where X1=R10-R1, and the initial parameters include the initial magnetic field strength and the initial collector addition amount.

[0085] When the difference in the removal of the first impurity X1 is larger, the removal rate of the first impurity R1 is smaller, which indicates that there is more key impurity content in the quartz sand after the first flotation purification. Therefore, it is necessary to remedy this by enhancing the "force field" and "selective capture capability" of the flotation process. Thus, the initial parameters in the second flotation purification need to be set larger. Therefore, the initial parameters increase as the difference in the removal of the first impurity X1 increases.

[0086] In one specific embodiment, a preset first impurity removal difference X10 is set and compared with a first impurity removal difference X1, and then the initial magnetic field strength and the initial amount of collector added are determined based on the comparison result; the preset first impurity removal difference X10 can be divided into a first preset first impurity removal difference X11 and a second preset first impurity removal difference X12, and X11 is set to 3% and X12 to 8% for example;

[0087] If X1 is less than or equal to X11, the initial magnetic field strength is determined to be 0.9T and the initial collector addition amount is 165g / t; if X1 is greater than X11 and less than or equal to X12, the initial magnetic field strength is determined to be 1.1T and the initial collector addition amount is 180g / t; if X1 is greater than X12, the initial magnetic field strength is determined to be 1.3T and the initial collector addition amount is 200g / t. In this case, the initial parameters set in the second flotation purification are all greater than the flotation purification parameters in the first flotation purification, and the settings of the initial magnetic field strength and the initial collector addition amount meet the requirements of the flotation process.

[0088] Please see Figure 3 As shown, it is a flowchart of the process for adjusting the initial parameters of the second flotation purification based on the comparison result between the retention rate of the first key element and the preset retention rate of the first key element in an embodiment of the present invention.

[0089] The retention rate C1 of the first key element can be used to determine the first flotation purification. The larger C1 is, the more silica content is retained after the first flotation purification. Therefore, in the second flotation purification, priority should be given to the removal of key flotation impurities. While balancing the silica content, priority should be given to removing residual key flotation impurities to improve the purity of quartz sand.

[0090] In one specific embodiment, a preset first key element retention rate C10 is set in advance and compared with a first key element retention rate C1, and then the adjustment amplitude of the initial parameters for the second flotation purification is determined based on the comparison result.

[0091] The higher the retention rate of the first key element C1, the more residual content of the key element - silica - in the quartz sand after the first flotation purification. In the second flotation process, the initial parameters of the flotation intensity can be appropriately set to enhance the removal effect on other flotation impurity elements. Therefore, the initial magnetic field strength and the initial collector addition amount in the second flotation purification increase with the increase of the retention rate of the first key element C1.

[0092] In this embodiment, the determination of the preset first key element retention rate C10 is based on the statistical correlation of historical flotation purification data. Specifically, under stable conditions of the first flotation purification process parameters, historical batch data is collected, batches whose final quartz sand purity meets the standard are selected, and the corresponding first key element retention rate C1 data for these batches is extracted to form a qualified sample set. By calculating the lower limit or a specific quantile (such as the 5th percentile) of this sample set, the obtained statistical value is established as the preset first key element retention rate C10. To more accurately determine the increase in the initial magnetic field strength and the initial collector addition amount in the second flotation purification, the preset first key element retention rate C10 can be divided into a first preset first key element retention rate C11 and a second preset first key element retention rate C12. For example, C11 = 95% and C12 = 98%. The process of determining the adjustment amplitude of the initial parameters for the second flotation purification based on the comparison results of the first key element retention rate C1 with the first preset first key element retention rate C11 and the second preset first key element retention rate C12 is as follows:

[0093] If C1 is less than or equal to C11, a first magnetic field strength increase adjustment command and a first collector addition amount increase adjustment command are generated. Based on the first magnetic field strength increase adjustment command, the magnetic field strength corresponding to the second flotation purification is increased to 1.25 times the initial value, and the collector addition amount is increased to 1.1 times the initial value, based on the first collector addition amount increase adjustment command. Wherein, if the initial magnetic field strength is set to 0.9T and the initial collector addition amount is set to 165g / t, the increased magnetic field strength is 1.125T, and the increased collector addition amount is 181.5g / t. If C1 is greater than C11 and less than or equal to C12, a second magnetic field strength increase adjustment command and a second collector addition amount increase adjustment command are generated. Based on the second magnetic field strength increase adjustment command, the magnetic field strength corresponding to the second flotation purification is increased to 1.3 times the initial value, and the collector addition amount is increased to 1.2 times the initial value, based on the second collector addition amount increase adjustment command. If C1 is greater than C12, a third magnetic field strength increase adjustment command and a third collector addition amount increase adjustment command are generated. The magnetic field strength corresponding to the second flotation purification is increased to 1.5 times the initial value based on the third magnetic field strength increase adjustment command, and the collector addition amount is increased to 1.4 times the initial value based on the third collector addition amount increase adjustment command.

[0094] S6: Determine the removal rate of the second impurity and the retention rate of the second key element based on the data characteristics obtained from the first acid washing and purification.

[0095] Specifically, the process involves obtaining several key impurities and their corresponding contents after the first acid leaching purification process. During acid leaching purification, key impurities include lattice impurity ions such as iron, aluminum, and titanium, alkali metal ions, and amorphous silica or silicates. The content of key impurities in the quartz sand ore before the first acid leaching purification is tested to determine the initial acid leaching impurity content, and the content of key impurities in the quartz sand ore after the first acid leaching purification is tested to determine the first acid leaching impurity content. Finally, the removal rate of the second impurity, R2, is calculated based on the ratio of the first acid leaching impurity content to the initial acid leaching impurity content: R2 = (initial acid leaching impurity content - first acid leaching impurity content) / initial acid leaching impurity content. The acid leaching impurity content is the average of the contents of several key impurities before or after the first acid leaching purification.

[0096] Furthermore, the content percentage of silica in this batch of quartz sand before the first acid washing and purification process and the content percentage of silica in this batch of quartz sand after the first acid washing and purification process are obtained. Based on the ratio of the content percentage of silica in this batch of quartz sand after the first acid washing and purification process to the content percentage of silica in this batch of quartz sand before the first acid washing and purification process, the retention rate of the second key element C2 is calculated, where C2 = content percentage of silica after the first acid washing and purification process / content percentage of silica after the first acid washing and purification process.

[0097] S7: Determine whether purification is complete based on the comparison result between the second impurity removal rate and the second impurity removal threshold, and start a second acid washing purification based on the second impurity removal rate if purification is not completed.

[0098] Specifically, a second impurity removal threshold R20 is pre-set and compared with the second impurity removal rate R2. The result of this comparison determines whether the purification of the quartz sand has been completed. The determination of the second impurity removal threshold R20 is based on the statistical correlation of historical quartz sand acid washing and purification data. Specifically, under stable conditions of the first acid washing and purification process parameters, historical batch data is collected, batches whose final quartz sand purity meets the standard are selected, and the corresponding second impurity removal rate R2 data for these batches are extracted to form a qualified sample set. By calculating the lower limit or a specific quantile (such as the 5th percentile) of this sample set, the obtained statistical value is established as the second impurity removal threshold R20. For example, R20 can be set to 95%. The process of comparing the first impurity removal rate R2 with the first impurity removal threshold R20 is as follows:

[0099] If R2 is less than or equal to R20, it indicates that the first pickling purification process failed to remove the key pickling impurities in the mixture. Currently, the content of key pickling impurities in the quartz sand is still too high during the pickling stage. Therefore, it is determined that the purity of the mixture after the first pickling does not meet the requirements of pickling purification. Thus, it is determined that the second pickling purification will be started based on the second impurity removal rate R2 to enhance the pickling purification efficiency.

[0100] If R2 is greater than R20, it indicates that the first acid washing purification process has achieved the target of removing key impurities, and the purity of the mixture meets the requirements of acid washing purification. Therefore, after both flotation purification and acid washing purification meet the corresponding purification requirements, the purification process of the current batch of quartz sand is determined to be completed.

[0101] S8: Determine the initial parameters for the second acid rinsing purification based on the removal rate of the second impurity, and determine the adjustment range of the initial parameters for the second acid rinsing purification based on the retention rate of the second key element. The initial parameters include the initial acid concentration and the initial reaction time.

[0102] Furthermore, when determining to start the second acid washing purification, the difference between the second impurity removal threshold R20 and the second impurity removal rate R2 is calculated to obtain the second impurity removal difference X2, and the initial parameters for the second acid washing purification are determined based on the second impurity removal difference X2, where X2 = R20 - R2, and the initial parameters include the initial acid concentration and the initial reaction time.

[0103] Specifically, the larger the difference in the removal of the second impurity X2, the smaller the removal rate R2 of the second impurity. This indicates that the quartz sand contains more critical acid-washed impurities after the first acid washing purification, and these impurities are more difficult to remove. Therefore, the initial acid concentration in the second acid washing purification needs to be set lower, and the initial reaction time needs to be set longer. By reducing the overall erosion of the quartz matrix, a safe window for a long-term reaction is provided, allowing sufficient time for the impurities to penetrate and diffuse into the particles, fully contact the stubborn impurities, and complete the reaction.

[0104] Please see Figure 4 As shown, it is a flowchart for determining the initial acid concentration and initial reaction time based on the comparison result of the second impurity removal difference and the preset second impurity removal difference in an embodiment of the present invention.

[0105] In one specific embodiment, a preset second impurity removal difference X20 is set and compared with a second impurity removal difference X2. Then, based on the comparison result, the initial acid concentration and the initial reaction time are determined. The preset second impurity removal difference X20 can be divided into a first preset second impurity removal difference X21 and a second preset second impurity removal difference X22. For example, X21=3% and X22=5%.

[0106] If X2 is less than or equal to X21, the initial acid concentration is set at 16% and the initial reaction time at 2.2 h; if X2 is greater than X21 and less than or equal to X22, the initial acid concentration is set at 13% and the initial reaction time at 2.6 h; if X2 is greater than X22, the initial acid concentration is set at 11% and the initial reaction time at 3.2 h. In this case, the initial acid concentration set for the second acid rinsing purification is less than the acid concentration set for the first acid rinsing purification, and the set initial reaction time is greater than the reaction time set for the first acid rinsing purification. Furthermore, the initial acid concentration and initial reaction time settings meet the requirements of the acid rinsing process.

[0107] The retention rate C2 of the second key element can be used to determine the first acid washing purification. The larger the C2, the more silica content is retained after the first acid washing purification. Therefore, in the second acid washing purification, priority should be given to the removal of key acid washing impurities. While balancing the silica content, priority should be given to removing residual key acid washing impurities to improve the purity of quartz sand.

[0108] In one specific embodiment, a preset second key element retention rate C20 is set in advance and compared with the second key element retention rate C2, and then the adjustment amplitude of the initial parameters for the second acid washing purification is determined based on the comparison result.

[0109] A higher retention rate of the second critical element C2 indicates that more silica, a key element in the quartz sand, is retained after the first acid leaching purification. Therefore, the adjustment range of acid concentration and reaction time during the second acid leaching purification can be set to be larger, thereby removing key impurities more efficiently. Furthermore, it is determined that in the second acid leaching purification, the acid concentration decreases as the retention rate of the second critical element C2 increases, and the reaction time increases as the retention rate of the second critical element C2 increases. This ensures that a smaller concentration of acid and a longer reaction time are used in the second acid leaching purification process to remove more stubborn key impurities.

[0110] In this embodiment, a higher C2 concentration (good quartz preservation) indicates minimal damage to the quartz from the first acid wash. The second acid wash can further reduce the acid concentration to protect the quartz, while extending the reaction time ensures effective impurity removal. If significant impurities remain after the first acid wash, it suggests the impurities may be more "stubborn" (e.g., encased within the quartz, existing as stable compounds). Blindly increasing the acid concentration may accelerate quartz dissolution, consequently reducing product purity and yield. For stubborn impurities, extending the reaction time is more beneficial for diffusion-controlled dissolution processes (e.g., impurities migrating from the particle interior to the exterior) than increasing the acid concentration. Prioritizing the integrity of the quartz matrix and compensating for the rate decrease at low concentrations by extending the reaction time achieves selective impurity removal.

[0111] In this embodiment, the determination of the preset second key element retention rate C20 is based on the statistical correlation of historical acid washing and purification data. Specifically, under stable conditions of the first acid washing and purification process parameters, historical batch data is collected, batches whose final quartz sand purity meets the standard are selected, and the corresponding second key element retention rate C2 data for these batches is extracted to form a qualified sample set. By calculating the lower limit or a specific quantile (such as the 5th percentile) of this sample set, the obtained statistical value is established as the preset second key element retention rate C20. To more accurately determine the magnitude of the decrease in acid concentration and the magnitude of the extension of reaction time in the second acid washing and purification, the preset second key element retention rate C20 can be divided into a first preset second key element retention rate C21 and a second preset second key element retention rate C22. For example, C21 = 96% and C22 = 98.5%. The process of determining the adjustment magnitude of the initial parameters for the second acid washing and purification based on the comparison results of the second key element retention rate C2 with C21 and C22 is as follows:

[0112] If C2 is less than or equal to C21, a first acid concentration reduction adjustment command and a first reaction time extension adjustment command are generated. Based on the first acid concentration reduction adjustment command, the acid concentration corresponding to the second acid washing purification is reduced to 0.9 times the initial value, and based on the first reaction time extension adjustment command, the reaction time corresponding to the second acid washing purification is extended to 1.2 times the initial value. Specifically, if the initial acid concentration is set to 11% and the initial reaction time is set to 3.2 hours, the reduced acid concentration will be 9.9%, and the increased reaction time will be 3.84 hours. If C2 is greater than C21 and less than or equal to C22, a second acid concentration reduction adjustment command and a second reaction time extension adjustment command are generated. Based on the second acid concentration reduction adjustment command, the acid concentration corresponding to the second acid washing purification is reduced to 0.85 times the initial value, and based on the second reaction time extension adjustment command, the reaction time corresponding to the second acid washing purification is extended to 1.3 times the initial value. If C2 is greater than C22, a third acid concentration reduction adjustment command and a third reaction time extension adjustment command are generated. Based on the third acid concentration reduction adjustment command, the acid concentration corresponding to the second acid washing purification is reduced to 0.8 times the initial value, and based on the third reaction time extension adjustment command, the reaction time corresponding to the second acid washing purification is extended to 1.5 times the initial value.

[0113] Specifically, after determining that the quartz sand purification process is complete or the second acid washing purification is initiated, the process also includes a data feedback and threshold optimization step: based on the relevant dataset finally obtained from the current purification batch, at least one of the first impurity removal threshold R10 and the second impurity removal threshold R20 is dynamically calibrated; wherein, the dynamic calibration process includes: comparing the content of key flotation impurities detected in the final quartz sand with the content of key flotation target impurities, and adjusting the first impurity removal threshold R10 based on the comparison result; comparing the content of key acid washing impurities detected in the final quartz sand with the content of key acid washing target impurities, and adjusting the second impurity removal threshold R20 based on the comparison result.

[0114] Furthermore, several key impurities and their corresponding contents in the purified quartz sand are obtained, resulting in the content of flotation key impurities Q1 and the content of acid washing key impurities Q2 detected in the final quartz sand.

[0115] In one specific embodiment, a preset target key impurity content Q10 for flotation is set and compared with the key impurity content Q1 for flotation. The first impurity removal threshold R10 is then adjusted based on the comparison result. The preset target key impurity content Q10 is determined based on the statistical correlation of historical quartz sand final product purity data. Specifically, under stable parameters throughout the purification process (including flotation, acid washing, etc.), historical production batch data is collected, and batches whose final quartz sand purity fully meets the standards are selected. The total content data of key impurities in these batches are extracted to form a high-quality finished product sample set. By calculating the upper limit or a specific higher quantile (e.g., the 95th percentile) of this sample set, the obtained statistical value is established as the preset target key impurity content Q10 for flotation. For example, Q10 can be set to 72 ppm. The process of comparing the key impurity content Q10 with the preset target key impurity content Q10 is as follows:

[0116] If Q1 is less than or equal to Q10, it indicates that the current flotation purification process has effectively removed a large amount of the target impurities, and the current flotation process is performing well for this batch of quartz sand, providing good material for the subsequent acid washing purification process. In this case, the first impurity removal threshold R10 can be appropriately reduced. When purifying the next batch of quartz sand, this can optimize the energy efficiency of the next purification process and reduce equipment energy consumption. The reduction in the first impurity removal threshold R10 increases as Q1 decreases.

[0117] If Q1 is greater than Q10, it indicates that although the flotation purification of quartz sand has been completed and the current flotation purification result meets the requirements, there are still relatively many target impurities in the quartz sand. Therefore, the flotation process is strengthened by increasing the first impurity removal threshold R10 to ensure the reliability of impurity removal in the purification process of the next batch of quartz sand and improve the flotation impurity removal rate. The increase in the first impurity removal threshold R10 increases with the increase of Q1.

[0118] A preset target key impurity content Q20 for acid washing is set and compared with the preset key impurity content Q2. The preset target key impurity content Q20 is determined based on the statistical correlation of historical quartz sand final product purity data. Specifically, under stable conditions throughout the purification process, historical production batch data are collected, and batches whose final quartz sand purity fully meets the standard are selected. The total content data of key impurities in these batches are extracted to form a high-quality finished product sample set. By calculating the upper limit or a specific higher quantile (e.g., the 95th percentile) of this sample set, the obtained statistical value is established as the preset target key impurity content Q20 for acid washing. For example, Q20 can be set to 80 ppm. The process of comparing the key impurity content Q2 with the preset target key impurity content Q20 is as follows:

[0119] If Q2 is less than or equal to Q20, it indicates that the current pickling and purification process has effectively removed a large amount of the target impurities, the current pickling process is operating well, and the purified material meets the purity requirements of high-purity quartz sand. At this point, the second impurity removal threshold R20 can be appropriately reduced. This will optimize the energy efficiency of the next batch of quartz sand purification process and reduce equipment energy consumption. The reduction in the second impurity removal threshold R20 increases as Q2 decreases.

[0120] If Q2 is greater than Q20, it indicates that although the acid washing and purification of quartz sand has been completed and the purity of quartz sand meets the requirements, there are still relatively many acid-washed target impurities remaining in the quartz sand. Therefore, the acid washing process is strengthened by increasing the second impurity removal threshold R20, thereby more effectively reducing the content of target impurities and ensuring the reliability of impurity removal in the purification process of the next batch of quartz sand, so as to improve the acid washing impurity removal rate. Among them, the increase of the second impurity removal threshold R20 increases with the increase of Q2.

[0121] To better illustrate the quartz sand purification process based on multidimensional parameter monitoring, the present invention will be further described below with reference to specific embodiments.

[0122] Example 1: In the purification process of this batch of high-purity quartz sand, the mixture of particles to be purified obtained after the first crushing was measured to have a particle size index value of M=240μm (greater than M0). Therefore, it was determined that the particle size index value did not meet the requirements of the first flotation purification, and the second crushing was initiated.

[0123] Based on the particle size index value M, the particle size distribution value D = 1.9 (greater than D1 and less than D2). Therefore, it is determined that a second crushing strength adjustment command is generated.

[0124] After the second crushing, the index value is M=185μm (less than M0), and it enters the first flotation purification;

[0125] After the first flotation is completed, the first impurity removal rate R1 is calculated to be 88% (less than R10). Therefore, it is determined to start the second flotation for purification.

[0126] Further calculations showed that the difference in the removal of the first impurity was X1 = 2% (less than X11). Therefore, the initial magnetic field strength was determined to be 0.9T and the initial amount of collector added was 165g / t.

[0127] The retention rate of the first key element, C1, was calculated to be 96.5% (greater than C11 and less than C12). Therefore, it was determined that a second magnetic field strength increase adjustment command and a second collector addition amount increase adjustment command would be generated.

[0128] After the second flotation purification is completed, the current removal rate of the first impurity is calculated to be R1 = 95% (greater than R10). Therefore, it is determined to start the first acid washing purification.

[0129] After the first acid washing and purification was completed, the removal rate of the second impurity was calculated to be R2 = 96% (greater than R20). Therefore, it was determined that the purification of this batch of quartz sand was completed.

[0130] Example 2: In the purification process of this batch of high-purity quartz sand, the mixture of particles to be purified obtained after the first crushing was measured to have a particle size index value of M=170μm (less than M0). Therefore, it was determined that the particle size index value met the requirements for the first flotation purification, and the first flotation purification was started.

[0131] After the first flotation purification is completed, the removal rate of the first impurity is calculated to be R1 = 95% (greater than R10). Therefore, it is determined to start the first acid washing purification.

[0132] After the first acid washing and purification was completed, the removal rate of the second impurity was calculated to be R2 = 88% (less than R20). Therefore, it was determined to start the second acid washing and purification.

[0133] Further calculations showed that the difference in the removal of the second impurity, X2, was 7% (greater than X22). Therefore, the initial acid concentration was determined to be 11% and the initial reaction time to be 3.2 h.

[0134] The retention rate of the second key element, C2, was calculated to be 98.5% (greater than C21 and less than or equal to C22). Therefore, the adjustment commands for reducing the concentration of the second acid and extending the reaction time were determined. This completed the purification of this batch of quartz sand.

[0135] Comparative Example 1:

[0136] The difference between this and Example 1 is that after calculating the retention rate of the first key element C1 = 96.5% after the first flotation, the generation of the second magnetic field strength increase adjustment command and the second collector addition amount increase adjustment command was not determined. The other conditions are the same as in Example 1.

[0137] Comparative Example 2:

[0138] The difference between this and Example 2 is that after the first acid washing and purification, when R2 is calculated to be 88%, the second acid washing and purification is not initiated, and the acid washing and purification process is considered complete. All other conditions are the same as in Example 2.

[0139] To comprehensively evaluate the effectiveness of the quartz sand purification process and the quality of the final product, the following testing methods were used:

[0140] Chemical composition purity analysis: The SiO2 content was determined by X-ray fluorescence spectrometry (XRF); the contents of key impurities such as Fe2O3 and Al2O3 were determined by inductively coupled plasma mass spectrometry (ICP-MS).

[0141] Physical particle size distribution analysis: The median particle size D50 and the content of fine powder (-400 mesh) were determined using a laser particle size analyzer.

[0142] Overall product quality score: The purified quartz sand samples were scored by 30 evaluators on a 100-point average scale based on three dimensions: "chemical grade", "physical specifications" and "apparent quality".

[0143] The key performance indicators of the final products are compared in the table below:

[0144] Table 1. Performance Comparison Results of Examples and Comparative Examples

[0145]

[0146] Conclusion Analysis:

[0147] Example 1: This example demonstrates a precise response to complex operating conditions through a complete decision chain. The final product's chemical purity and physical properties both meet the preset high standards, proving the effectiveness of multi-level condition judgment and parameter coordinated adjustment.

[0148] Example 2: Under excellent initial material conditions, the system accurately judges that each main indicator meets the standard, and obtains high-purity products with the most economical single-stage purification process, proving its value in optimizing production energy efficiency.

[0149] Comparative Example 1: A misjudgment in the core decision-making process led to a reversal of the process logic. A large amount of aluminosilicate impurities that should have been removed in the flotation stage entered the acid washing and purification process. This not only interfered with the selective removal of iron and titanium impurities by acid washing but also resulted in significant waste of acid and alkali reagents. The final product showed a significantly higher impurity content, proving that correct initial decision-making is the cornerstone of ensuring the overall purification efficiency.

[0150] Comparative Example 2: Although the main process judgment was correct, due to system function deficiencies, it failed to utilize the in-depth process information of the retention rate of the first critical element for proactive optimization. The lack of adaptation to non-ideal material states (quartz loss) resulted in suboptimal subsequent acid washing efficiency, leading to a difference in product purity compared to the example. This demonstrates that multi-parameter fusion sensing and intelligent pre-adjustment based on process knowledge are key to achieving stable, high-yield, and high-purity products.

[0151] In summary, the purification method of the present invention, when fully implemented, can flexibly adapt to different material conditions and production states through multi-source sensing, multi-level decision-making, and multi-parameter coordination. While ensuring the high purity of the final product, it can significantly improve the stability of the production process and the overall energy efficiency.

[0152] All technologies not mentioned in the above embodiments are existing technologies. It is understood that no specific limitation is made to any preset parameter or critical parameter in the embodiments of the present invention, and the above values ​​are not limited thereto. Those skilled in the art can adjust the preset parameters or critical parameters accordingly based on actual needs, analysis of historical data, or equipment usage.

[0153] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A method for purifying high-purity quartz sand based on multi-parameter fusion, characterized in that, include: The quartz ore is first crushed, and the particle size index value is determined based on the data characteristics obtained from the first crushing. The particle size index value is calculated as follows: Particle size index value = a1 × median particle size D50 + a2 × top particle size D90. The median particle size D50 is the average size of the mixture of particles to be purified, and the top particle size D90 is the coarse end of the particles to be purified. a1 and a2 are the weighting coefficients of the median particle size D50 and the top particle size D90, respectively. The process involves determining whether to proceed to the first flotation purification stage based on the comparison between the particle size index value and the particle size index threshold, and initiating a second crushing operation based on the particle size index value if the first flotation purification stage is not initiated. This includes: The particle size distribution value is determined based on the particle size index value, wherein the particle size distribution value = top particle size D90 / median particle size D50; Based on the comparison between the particle size distribution value and the preset particle size distribution value, the crushing intensity of the crusher in the second crushing is increased, wherein the increase in crushing intensity is positively correlated with the particle size distribution value. The crushing intensity in the first crushing is used as the initial crushing intensity when the crusher is adjusted for increased crushing intensity in the second crushing. Specifically, when the particle size distribution value is less than or equal to D1, the crushing intensity corresponding to the second crushing is increased to 1.2 times the initial crushing intensity based on the first crushing intensity adjustment command; if the particle size distribution value is greater than D1 and less than or equal to D2, the crushing intensity corresponding to the second crushing is increased to 1.4 times the initial crushing intensity based on the second crushing intensity adjustment command; if the particle size distribution value is greater than D2, the crushing intensity corresponding to the second crushing is increased to 1.6 times the initial crushing intensity based on the third crushing intensity adjustment command. Here, D1 is the first preset particle size distribution value, and D2 is the second preset particle size distribution value. The first impurity removal rate and the first key element retention rate are determined based on the data characteristics obtained from the first flotation purification. The first key element retention rate is calculated as: the percentage of silica content after the first flotation purification / the percentage of silica content before the first flotation purification. Based on the comparison result between the first impurity removal rate and the first impurity removal threshold, it is determined whether to proceed with the first acid leaching purification, and if it is determined that the first acid leaching purification should not proceed, a second flotation purification is initiated based on the first impurity removal rate. The process of determining the initial parameters for the second flotation purification based on the first impurity removal rate includes: The first impurity removal difference is calculated based on the difference between the first impurity removal threshold and the first impurity removal rate. The initial parameters for the second flotation purification are determined based on the difference in the removal of the first impurity, and the initial parameters for the second flotation purification are positively correlated with the difference in the removal of the first impurity. The initial parameters for the second flotation purification are determined based on the first impurity removal rate, and the initial parameters for the second flotation purification are increased based on the comparison result between the first key element retention rate and the preset first key element retention rate. The initial parameters include the initial magnetic field strength and the initial collector addition amount. The increase in the initial magnetic field strength and the initial collector addition amount are both positively correlated with the first key element retention rate. The removal rate of the second impurity and the retention rate of the second key element are determined based on the data characteristics obtained from the first acid washing and purification. The retention rate of the second key element is: the percentage of silica content after the first acid washing and purification / the percentage of silica content before the first acid washing and purification. The process involves determining whether purification is complete based on the comparison between the second impurity removal rate and the second impurity removal threshold, and initiating a second acid leaching purification based on the second impurity removal rate if purification is incomplete. The process of determining the initial parameters for the second acid leaching purification based on the second impurity removal rate includes: The second impurity removal difference is calculated based on the difference between the second impurity removal threshold and the second impurity removal rate; The initial parameters for the second acid leaching and purification are determined based on the difference in the removal of the second impurity, and the initial parameters for the second acid leaching and purification are positively correlated with the difference in the removal of the second impurity. The initial parameters for the second acid leaching and purification are determined based on the second impurity removal rate, and the initial parameters for the second acid leaching and purification are adjusted based on the comparison between the second key element retention rate and the preset second key element retention rate. The initial parameters include the initial acid concentration and the initial reaction time. The decrease in the initial acid concentration and the increase in the initial reaction time are both positively correlated with the second key element retention rate.

2. The multi-parameter fusion-based high-purity quartz sand purification method according to claim 1, characterized in that, The determination of whether to proceed to the first flotation purification step based on the comparison result between the particle size index value and the particle size index threshold includes: If the particle size index value is less than or equal to the particle size index threshold, it is determined that the current particle mixture to be purified meets the flotation requirements, and it is determined to enter the first flotation purification. If the particle size index value is greater than the particle size index threshold, it is determined that the current mixture of particles to be purified does not meet the flotation requirements, and a second crushing is initiated based on the particle size index value.

3. The multi-parameter fusion-based high-purity quartz sand purification method according to claim 2, characterized in that, The determination of whether to proceed to the first acid washing purification based on the comparison result between the first impurity removal rate and the first impurity removal threshold includes: If the first impurity removal rate is less than or equal to the first impurity removal threshold, it is determined that the purity of the mixture after the first flotation does not meet the flotation purification requirements, and a second flotation purification is initiated based on the first impurity removal rate. If the first impurity removal rate is greater than the first impurity removal threshold, it is determined that the purity of the mixture after the first flotation meets the flotation purification requirements, and it is determined to proceed to the first acid washing purification.

4. The multi-parameter fusion-based high-purity quartz sand purification method according to claim 3, characterized in that, The process of determining whether purification is complete based on the comparison result between the second impurity removal rate and the second impurity removal threshold includes: If the removal rate of the second impurity is less than or equal to the removal threshold of the second impurity, it is determined that the purity of the mixture after the first acid washing and purification does not meet the acid washing and purification requirements, and the second acid washing and purification is started based on the removal rate of the second impurity. If the removal rate of the second impurity is greater than the removal threshold of the second impurity, it is determined that the purity of the mixture after the second acid washing and purification meets the acid washing and purification requirements, and the quartz sand purification process is completed.

5. The multi-parameter fusion-based high-purity quartz sand purification method according to claim 1, characterized in that, After determining that the quartz sand purification process is complete or the second acid washing purification is initiated, the process also includes data feedback and threshold optimization steps: Based on the relevant dataset finally obtained from the current purification batch, at least one of the first impurity removal threshold and the second impurity removal threshold is dynamically calibrated; The dynamic calibration process includes: comparing the content of key flotation impurities detected in the final quartz sand with the content of key flotation target impurities, and adjusting the first impurity removal threshold based on the comparison result. The content of key impurities detected in the final quartz sand is compared with the content of key impurities in the pickling target, and the second impurity removal threshold is adjusted based on the comparison results.

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