Tailings mixed aggregate full-continuous grading mix proportion design method and system

Abstract

The application provides a tailing mixed aggregate full-continuous grading proportioning design method and system, and belongs to the technical field of tailing resource utilization and industrial proportioning control. The method comprises the following steps: determining a basic mixing proportioning according to raw material batch parameters of each aggregate bin, and converting the basic mixing proportioning into basic feeding parameters of each aggregate bin; when the raw material batch parameters of the fine aggregate bin change, determining a replacement amount between the fine aggregate bins, and correcting the corresponding basic feeding parameters according to the replacement amount. The method provided by the application determines the basic mixing proportioning by combining the raw material batch parameters of each aggregate bin, and when the fine aggregate batch changes, the effective replacement amount is determined according to the target sieve hole deviation and multiple constraints, and the feeding parameters are corrected under the condition that the relative mass proportion of the coarse aggregate remains unchanged.

Description

Technical Field

[0001] This application relates to the fields of tailings resource utilization and industrial batching control technology, and in particular to a method and system for designing a fully continuous gradation of tailings mixed aggregates. Background Technology

[0002] Tailings sand can be mixed with manufactured sand, stone powder, and gravel of different sizes to form mixed aggregates. By adjusting the mass ratio of different aggregates, the sieve passing rate, mud content, and stockpiling state of the mixed aggregates can meet the corresponding usage requirements. In the actual batching process, various aggregates are usually stored in different silos, and their sieve composition, moisture content, mud content, and other parameters will vary with the source of raw materials and batches.

[0003] The existing invention patent CN116386771B discloses a design method for low-carbon cement-stabilized crushed stone materials. The method determines the gradation composition by screening various grades of aggregates and tailings sand. The mixing ratio between tailings sand, fine aggregates and adhesive powder is controlled according to the passing rate of key sieves of 0.6mm and 0.075mm. At the same time, the proportion of each material is further determined by combining the remaining porosity of coarse aggregates after molding, so as to realize the multi-grade aggregate mix design including tailings sand.

[0004] The aforementioned technologies can determine the proportion of tailings sand with aggregates of different particle sizes based on screening results and key screen aperture requirements, but they are mainly designed for mix proportions under given raw material conditions. When a fine aggregate bin changes its raw material batch, screening composition, or clay parameters during continuous batching, further consideration is needed on how to adjust the feeding relationship between fine aggregates based on the full screen aperture gradation, clay content, and actual feeding conditions while maintaining the coarse aggregate proportion. Furthermore, it is necessary to consider how to restrict the continued participation of the changed batch in feeding when adjustments between bins cannot meet the corresponding constraints. Therefore, a tailings mixed aggregate mix proportion design method that can adapt to changes in raw material batches is required. Summary of the Invention

[0005] To address the aforementioned technical problems, this application provides a method and system for designing the proportioning of fully continuous gradation of tailings mixed aggregates.

[0006] In a first aspect, this application provides a method for designing a fully continuous gradation mix proportion of tailings mixed aggregate, comprising: determining a basic mixing ratio based on the raw material batch parameters of each aggregate bin, and converting the basic mixing ratio into basic feeding parameters for each aggregate bin.

[0007] When the raw material batch parameters of the fine aggregate bins change, determine the substitution amount between the fine aggregate bins and adjust the corresponding basic feeding parameters based on the substitution amount.

[0008] The basic mixing ratio includes: coarse aggregate protection ratio and fine aggregate ratio containing tailings sand. The coarse aggregate protection ratio is determined according to the packing parameters of each coarse aggregate, and the relative mass ratio between each coarse aggregate bin is maintained when the basic feeding parameters are corrected.

[0009] The substitution amount includes: determining the substitution amount based on the target sieve aperture deviation caused by changes in raw material batch parameters; ensuring that the total dry mass between the fine aggregate bins participating in the substitution remains unchanged; and ensuring that the mixed aggregate after substitution satisfies the full sieve aperture gradation constraint, clay constraint, and feeding constraint. When there is no substitution amount that satisfies the full sieve aperture gradation constraint, clay constraint, and feeding constraint, the corresponding raw material batch is restricted from participating in the feeding.

[0010] By adopting the above technical solution, based on the determination of the basic mixing ratio, the feed amount of fine aggregates participating in the substitution can be adjusted according to the changes in the batch parameters of fine aggregate raw materials, while keeping the coarse aggregate protection ratio unchanged. This ensures that the mixed aggregates after the change of raw material batches are still checked according to the full sieve gradation, clay content and feeding conditions, thereby improving the pertinence of the mix ratio adjustment when different raw material batches are used continuously.

[0011] Preferably, the raw material batch parameters include: screening parameters, moisture content, clay characterization parameters, and packing parameters.

[0012] The dry mass of each aggregate bin is determined based on the moisture content. Based on the dry mass of each aggregate bin and the screening parameters, the contribution of each aggregate bin to the synthesis pass rate of different sieve openings is determined.

[0013] The mud characterization parameters include mud content and MB results. Mud content is used to determine the mixed mud content, and MB results are used to determine the upper limit of allowable feed for the corresponding raw material batch.

[0014] By adopting the above technical solution, the screening parameters, moisture content, clay characterization parameters and bulking parameters of each aggregate can be uniformly mapped to specific raw material batches. The dry material quality is used as the common basis for gradation calculation and clay calculation, so that the influence of each silo on the gradation and clay state of the mixed aggregate can be determined separately, providing parameter basis for subsequent determination of basic proportions and feeding correction after batch changes.

[0015] Preferably, the coarse aggregate protection proportion includes: generating a coarse aggregate candidate proportion based on the screening parameters of each coarse aggregate, measuring the mixed bulk density of the coarse aggregate candidate proportion that meets the coarse aggregate gradation constraints, and determining the relative mass ratio between each coarse aggregate in the coarse aggregate candidate proportion with the largest mixed bulk density as the coarse aggregate protection proportion.

[0016] By adopting the above technical solution, the coarse aggregate protection ratio can be determined by combining the mixed bulk density among the candidate mix proportions that meet the coarse aggregate gradation constraints, and the relative mass ratio between each coarse aggregate bin can be maintained during the fine aggregate feeding parameter correction process, thereby reducing the impact of fine aggregate adjustment on the determined coarse aggregate gradation relationship.

[0017] Preferably, the full sieve aperture gradation constraint includes: the target throughput range corresponding to each sieve aperture; determining the expected throughput of each sieve aperture based on the changed raw material batch parameters and basic feeding parameters; calculating the ratio of the expected throughput exceeding the boundary of the corresponding target throughput range to the width of the target throughput range; determining the sieve aperture with the largest ratio as the target sieve aperture; and determining the target sieve aperture deviation and correction direction based on the boundary exceeded by the expected throughput.

[0018] By adopting the above technical solution, the target sieve holes to be prioritized can be determined according to the degree of deviation of the expected throughput of each sieve hole from the target throughput range, and the correction direction can be determined according to the situation where the expected throughput exceeds the upper or lower limit, so that the calculation of the subsequent replacement amount has a clear sieve hole constraint object and adjustment direction.

[0019] Preferably, the reference value of the substitution amount includes: when the expected throughput of the target sieve aperture is higher than the corresponding target throughput range, the fine aggregate bin with the lower target sieve aperture throughput is determined as the first fine aggregate bin, and the fine aggregate bin with the higher target sieve aperture throughput is determined as the second fine aggregate bin.

[0020] When the expected throughput of the target sieve aperture is lower than the corresponding target throughput range, the fine aggregate bin with the higher target sieve aperture throughput is designated as the first fine aggregate bin, and the fine aggregate bin with the lower target sieve aperture throughput is designated as the second fine aggregate bin.

[0021] The baseline substitution amount is determined based on the target sieve aperture deviation, the total dry mass of fine aggregate, and the difference in the pass rate between the first and second fine aggregate bins at the target sieve aperture.

[0022] By adopting the above technical solution, two fine aggregate bins with different passing rates at the target screen hole can be selected according to the correction direction of the target screen hole. The benchmark replacement amount is determined according to the target screen hole deviation and the difference in passing rates between the two bins, so that the increase or decrease relationship between fine aggregates corresponds to the correction direction of the target screen hole passing rate, while keeping the total dry material mass of the bins participating in the replacement unchanged.

[0023] Preferably, the feeding constraints include the feeding range of the feeding devices corresponding to the first and second fine aggregate bins.

[0024] The increase in dry material in the first fine aggregate bin and the decrease in dry material in the second fine aggregate bin are taken as the same substitution amount. The substitution amount is determined in the range of target passing rate, upper limit of mixed mud content, upper limit of allowable feed of corresponding raw material batch, and feed range of corresponding feed equipment for each screen hole. The intersection of each allowable interval is then calculated.

[0025] When the intersection is not empty, determine the effective substitute quantity that minimizes the target sieve hole deviation from the intersection.

[0026] When the intersection is empty, it is determined that the first fine aggregate bin and the second fine aggregate bin cannot form a valid substitution relationship.

[0027] By adopting the above technical solution, the target pass rate range of the screen aperture, the upper limit of the mixed mud content, the upper limit of the allowable feed of raw material batches, and the feed range of the feeder can be converted into allowable ranges of the substitution amount, and the executable range of the substitution amount can be determined by the intersection of the ranges, so that the determined effective substitution amount is simultaneously constrained by the gradation, mud quality and feed conditions.

[0028] Preferably, the selection of the effective substitution amount includes: determining the corresponding allowable interval intersection and effective substitution amount for different fine aggregate bin combinations, and determining the expected passing rate of each screen, the mud content of the mixture, and the remaining margin of the feeding parameters relative to the corresponding constraint boundary based on the correction results corresponding to each effective substitution amount.

[0029] The combination of fine aggregate bins with the largest minimum surplus margin is determined as the target substitution combination, and the effective substitution amount corresponding to the target substitution combination is determined as the substitution amount used to correct the basic feed parameters.

[0030] By adopting the above technical solution, when there are multiple feasible fine aggregate substitution combinations, the remaining margin of each combination correction result relative to different constraint boundaries can be compared, and the minimum remaining margin can be used as the basis for combination selection, so that the target substitution combination retains the corresponding adjustment margin while satisfying various constraints.

[0031] Preferably, the target sieve aperture deviation includes: target sieve aperture deviations corresponding to at least two target sieve apertures respectively.

[0032] Correction of target sieve apertures includes: correcting the apertures in descending order of the ratio by which the expected pass rate of each target sieve aperture exceeds the corresponding target pass rate range.

[0033] After completing the correction of the current target sieve hole, the current target sieve hole is added to the set of corrected sieve holes. When determining the allowable range of the substitution amount corresponding to the next target sieve hole, the corrected sieve holes are kept within the range of the corresponding target pass rate as an additional constraint.

[0034] By adopting the above technical solution, when multiple screen holes deviate simultaneously, they can be corrected sequentially according to the normalized degree of deviation. The screen holes that have already been corrected are used as additional constraints for the calculation of the next substitution quantity, so that the next round of adjustment can take into account the target pass rate range of the screen holes that have been corrected in the previous round while processing the current target screen hole.

[0035] Preferably, the restriction on the feeding of the corresponding raw material batch includes: limited feeding and stopping feeding. When the intersection of the allowable intervals corresponding to different fine aggregate bin combinations is empty, under the condition that the basic feeding parameters of other aggregate bins remain unchanged, the upper limit of dry material feeding of the changed raw material batch is determined according to the target passing rate range and the upper limit of mixed mud content corresponding to each screen hole, and the minimum value among the upper limits of dry material feeding is determined as the restricted feeding amount of the raw material batch.

[0036] When the restricted feed rate is not lower than the minimum feed rate of the corresponding feeding equipment, the raw material batch shall be fed in a limited quantity according to the restricted feed rate.

[0037] When the feed rate is lower than the minimum feed rate of the corresponding feeder, the batch of raw materials is stopped from participating in the feeding.

[0038] By adopting the above technical solution, when an effective substitution relationship cannot be formed between fine aggregate bins, the limited feed amount of the batch with changes can be further determined based on the gradation constraints and the mud content constraints. Combined with the minimum feeding capacity of the feeding equipment, the limited feeding or stopping feeding can be selected, so that the raw material batch still has a processing method corresponding to the actual feeding conditions when the substitution correction cannot be directly completed.

[0039] A second aspect of this application provides a tailings mixed aggregate fully continuous gradation and proportioning design system, including: a parameter acquisition module, a feeding module, and a processing module.

[0040] The processing module is connected to the parameter acquisition module and the feeding module. The parameter acquisition module is used to obtain the raw material batch parameters of each aggregate bin.

[0041] The processing module is used to determine the basic mixing ratio, including the coarse aggregate protection ratio and the fine aggregate ratio containing tailings sand, based on the raw material batch parameters, and convert the basic mixing ratio into the basic feeding parameters of each aggregate bin.

[0042] The processing module is also used to determine the target sieve aperture deviation when the raw material batch parameters of the fine aggregate bins change, while keeping the relative mass ratio between each coarse aggregate bin constant. The increase or decrease of equal dry material between the two fine aggregate bins involved in the substitution is taken as the same substitution amount. The allowable range of the substitution amount under the constraints of full sieve aperture gradation, clay content, and feed is determined respectively. The intersection of each allowable range is calculated. Based on the intersection and the remaining margin between the correction result and each constraint boundary, the target substitution combination and the effective substitution amount are determined.

[0043] The feeding module is used to adjust the basic feeding parameters of the two fine aggregate bins in the target substitution combination according to the effective substitution amount, and when there is no effective substitution amount, it restricts the corresponding raw material batch to participate in feeding according to the limited feeding amount determined by the processing module.

[0044] By adopting the above technical solution, the parameter acquisition module, processing module and feeding module can form a correspondence between raw material batch parameter acquisition, basic proportion calculation, batch change judgment, substitution amount determination and feeding parameter execution. When the fine aggregate batch changes, the coarse aggregate protection proportion is maintained. The effective substitution amount or the feeding amount is determined by multiple constraints, so that the proportion calculation result can be further converted into the actual feeding parameters of the corresponding silo.

[0045] The beneficial effects of the tailings mixed aggregate fully continuous gradation mix design method and system provided in this application are as follows: By combining the screening parameters, moisture content, clay characterization parameters, and packing parameters of each aggregate bin, the basic mixing mix ratio is determined, and the coarse aggregate protection mix ratio and the fine aggregate mix ratio containing tailings sand are determined separately, so that the mix ratio can simultaneously take into account gradation, clay content, and feeding conditions. When the batch of fine aggregate raw materials changes, the target screen size and correction direction are determined according to the deviation between the expected passing rate of each screen and the target range. The effective substitution amount is determined by the equal dry material substitution between fine aggregate bins, and the relative mass ratio of coarse aggregate remains unchanged during the correction process. At the same time, the constraints are checked by combining the full screen gradation, mixed clay content, batch allowable feeding upper limit, and feeding range of the feeding equipment. When there is no effective substitution amount, the limited feeding or feeding stop is implemented according to the limited feeding amount, so that the tailings mixed aggregate mix ratio can adapt to changes in raw material batches, improving the feasibility and stability of mix ratio adjustment during continuous batching. Attached Figure Description

[0046] Figure 1 A bar chart of the basic feed quality of a seven-compartment mixed aggregate full continuous gradation proportioning design method for tailings mixed aggregate;

[0047] Figure 2 A schematic diagram showing the substitution amount and sieve aperture passing rate constraints for a fully continuous gradation and proportioning design method for tailings mixed aggregates;

[0048] Figure 3 A schematic diagram of the multi-screen sequential correction trajectory for a fully continuous gradation and proportioning design method for tailings mixed aggregates;

[0049] Figure 4 A time sequence diagram of the system connection relationships for a fully continuous gradation and proportioning design system for tailings mixed aggregates. Detailed Implementation

[0050] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0051] To make the purpose, technical solution, and advantages of this application clearer, the following will be described in conjunction with the appendix. Figure 1 -Appendix Figure 3 The following is an explanation using specific examples.

[0052] Example 1

[0053] Reference Figure 1 In one embodiment of the present invention, a tailings mixed aggregate fully continuous gradation proportioning design method is provided, in which the basic mixing proportion is determined according to the raw material batch parameters of each aggregate bin, and the basic mixing proportion is converted into the basic feeding parameters of each aggregate bin.

[0054] Seven aggregate bins are set up. The first to fourth aggregate bins store small yellow sand, manufactured sand, tailings sand, and stone powder, respectively. The fifth to seventh aggregate bins store 0.5-ton stones, 1-2-ton stones, and 2-4-ton stones, respectively. Each time the source of raw materials is changed, raw materials are refilled into the same bin, or continuous feeding is resumed after an interruption, a new batch identifier is established, and the bin number, raw material name, sampling time, and test results are associated with the batch identifier.

[0055] Raw material batch parameters include: screening parameters, moisture content, clay characterization parameters, and packing parameters. Screening parameters are expressed as the mass passing rate of the raw material at each sieve opening.

[0056] Specifically, the mass of dry material passing through the corresponding sieve opening is divided by the total dry mass of the sieved sample. Moisture content is determined by the ratio of the difference between the wet mass and the dried mass to the wet mass. Clay characterization parameters include clay content and MB results. Clay content is used to calculate the mixed clay content of the aggregate, while MB results are used to determine whether the corresponding fine aggregate batch can be used directly and the upper limit of allowable feeding for that batch. Bulk density parameters are obtained by measuring the bulk density under the same container, loading method, and compaction conditions.

[0057] For the A preferred method for calculating the synthesis pass rate of mixed aggregates using a sieve with multiple apertures is as follows:

[0058]

[0059] in, Indicates the mixed aggregate in the first Synthesis pass rate at each sieve aperture Indicates the first The quality of dry materials involved in the mixing of each silo Indicates the first The raw materials in the silo are in the first Quality pass rate at each sieve aperture This indicates the number of bins involved in the mixing process.

[0060] It should be noted that in this embodiment... The value is 7, and the pass rates for each quality level are calculated as decimals.

[0061] The contribution of each silo to the synthesis pass rate at different sieve openings is calculated as follows: multiply the dry mass of the silo by the pass rate of the raw material at the corresponding sieve opening to obtain the mass of the silo passing through the corresponding sieve opening; then divide the mass of the passing through the silo by the total dry mass of the mixed aggregate to obtain the contribution of the silo to the synthesis pass rate at the corresponding sieve opening. Adding the contributions of each silo together yields the synthesis pass rate at the corresponding sieve opening.

[0062] The process for determining the mixed mud content is as follows: Multiply the dry mass of each silo by the mud content of the corresponding raw material to obtain the mud mass carried in by each silo; sum the mud masses carried in by each silo, and then divide by the total dry mass of the mixed aggregate to obtain the mixed mud content. The MB result is not a simple weighted average based on the dry mass of each silo, but rather determines the allowable feed limit for the corresponding batch based on the results of single-material testing or premixing testing.

[0063] The basic parameters of the raw materials in the first to fourth aggregate bins are as follows: the bulk density of small yellow sand is 1350 kg / m³, the mud content is 2%, and the fineness modulus is 1.26; the bulk density of manufactured sand is 1450 kg / m³, the mud content is 6.3%, the MB result is 1.3, and the fineness modulus is 2.4; the bulk density of tailings sand is 1500 kg / m³, the mud content is 1.3%, and the fineness modulus is 2.86; and the bulk density of stone powder is 1400 kg / m³, the mud content is 15.5%, and the fineness modulus is 2.52.

[0064] For raw material batches for which valid MB results have not been obtained, the permissible feed limit for that batch will be uncertain until supplementary test results are obtained or the premixing test is completed, and the corresponding batch will be set to a pending retest status. It cannot be concluded that a raw material can offset the mud content of other raw materials simply because the mud content of a particular raw material is low.

[0065] In the fifth to seventh aggregate bins, the bulk density of 0.5 stone is 1410 kg / m³, the bulk density of 1-2 stone is 1370 kg / m³, and the bulk density of 2-4 stone is 1380 kg / m³.

[0066] If any batch is missing moisture content data, screening data, or screening pass rate does not decrease with increasing screen aperture size, the corresponding batch will be marked as an invalid batch. Invalid batches will be resampled and tested; they will not be used to determine the basic mixing ratio until complete and valid parameters are obtained.

[0067] Furthermore, the proportion of fine aggregate and the proportion of coarse aggregate for protection of tailings sand were determined.

[0068] Three candidate fine aggregate proportions were set up in the order of small yellow sand, manufactured sand, tailings sand, and stone powder. The first candidate proportion was 1:3:3:3, with a premix mud content of 6.7%, an MB result of 1.5, and a mixed bulk density of 1450 kg / m³. The second candidate proportion was 1:3:2:4, with a premix mud content of 8.5%, an MB result of 2.3, and a mixed bulk density of 1430 kg / m³. The third candidate proportion was 1:2:2:5, with a premix mud content of 10.0%, an MB result of 3.0, and a mixed bulk density of 1390 kg / m³.

[0069] The upper limit for mud content in fine aggregate premix is ​​set at 8.0%, and the upper limit for MB results is set at 2.0. These limits are determined based on the usage requirements of the corresponding mixed aggregates and the premix test results, and are used for the proportioning screening of this batch of raw materials. They are not fixed limits that must be adopted for other batches of raw materials.

[0070] The mud content and MB results of the first candidate mix proportion did not exceed the corresponding upper limit; the mud content and MB results of the second candidate mix proportion both exceeded the limit; the mud content and MB results of the third candidate mix proportion both exceeded the upper limit. Therefore, the first candidate mix proportion was determined to be the fine aggregate mix proportion containing tailings sand.

[0071] Based on the premixing results of the first and second candidate proportions, the proportion of stone powder in the total dry mass of fine aggregate in this batch is determined to be no more than 30%. Specifically: when the stone powder proportion is 30%, the MB result of the premix is ​​1.5, which does not exceed the upper limit of 2.0; when the stone powder proportion increases to 40%, the MB result of the premix increases to 2.3, exceeding the corresponding upper limit. Therefore, 30% is taken as the upper limit of the allowable feed proportion of stone powder in this batch. When the raw material batch parameters of stone powder change, the allowable feed upper limit will be re-determined based on the premixing results of the new batch.

[0072] Candidate coarse aggregate mix proportions were generated based on the screening parameters of the three coarse aggregate bins. Using a 10% adjustment step size between bins, candidate mix proportions that did not meet the gradation requirements were first eliminated based on the target throughput range of the coarse aggregate section. Then, the mixed bulk density of the remaining candidate mix proportions was determined under the same container, same loading mass, and same compaction conditions.

[0073] When 0.5 grit, 1-2 grit, and 2-4 grit are mixed in a mass ratio of 2:5:3, the mixed bulk density is 1480 kg / m³. This mixed bulk density is the maximum value among the candidate mix proportions that satisfy the gradation constraints of the coarse aggregate section. Therefore, 2:5:3 is determined as the coarse aggregate protection mix proportion. When subsequently adjusting the fine aggregate feeding parameters, the relative mass ratio of 2:5:3 is maintained between the three coarse aggregate bins.

[0074] Furthermore, the basic mixing ratio is converted into the basic feeding parameters for each aggregate bin.

[0075] Taking a total dry weight of 1000 kg for each batch of mixed aggregates as an example, based on the full sieve gradation calculation results, the total dry weight of fine aggregates is determined to be 400 kg, and the total dry weight of coarse aggregates is determined to be 600 kg.

[0076] Based on a fine aggregate ratio of 1:3:3:3, the basic dry aggregate masses of the first to fourth aggregate bins are 40 kg, 120 kg, 120 kg, and 120 kg, respectively. Based on a coarse aggregate ratio of 2:5:3, the basic dry aggregate masses of the fifth to seventh aggregate bins are 120 kg, 300 kg, and 180 kg, respectively.

[0077] After determining the dry material quality, recalculate the synthetic passing rate and mud content of all sieve openings. The basic mixing ratio is only output when the synthetic passing rate of each sieve opening is within the corresponding target passing rate range, the mud content of the mixture does not exceed the upper limit, each batch of fine aggregate does not exceed the allowable feed upper limit, and the feed rate of each silo is within the stable feed range of the corresponding feeding equipment. If any condition is not met, the candidate mixing ratio is excluded, and another candidate mixing ratio is selected.

[0078] The moisture content of the raw materials in the first to fourth aggregate bins is 5%, 3%, 2%, and 1.5%, respectively, while the moisture content of the raw materials in the fifth to seventh aggregate bins is 1%. The process for determining the wet material feed quality is as follows: divide the target dry material quality of the corresponding bin by 1 and the difference between that bin's moisture content and the target dry material quality.

[0079] Therefore, the basic wet material feeding masses of the first to seventh aggregate bins are determined to be 42.11 kg, 123.71 kg, 122.45 kg, 121.83 kg, 121.21 kg, 303.03 kg and 181.82 kg respectively, and the wet material feeding masses are used as the target weighing values ​​for each feeding device.

[0080] When using continuous feeding, the target wet material mass of a single batch is divided by the set feeding time to obtain the feeding amount per unit time; then, the target driving frequency is determined based on the pre-established correspondence between the feeding amount and the driving frequency of the feeding equipment.

[0081] The correspondence is obtained by calibrating the actual feed quality at at least three stable operating frequencies. Linear interpolation is used between adjacent calibration points, and no interval extrapolation is performed on the target feed amount that is lower than the stable feed lower limit or higher than the rated feed upper limit.

[0082] Finally, the basic dry material quality, basic wet material feed quality, and control parameters of the corresponding feeding equipment of the seven aggregate bins are output. The above results are saved together with the current batch identifier of each bin as the starting point for calculating the substitution amount when the batch of fine aggregate raw materials changes.

[0083] Example 2

[0084] Reference Figure 2 This invention provides a specific implementation method for determining the target sieve size, the baseline substitution amount, the allowable range of substitution amount, and the target substitution combination in a fully continuous gradation design method for tailings mixed aggregates.

[0085] First, determine the target sieve aperture deviation and the correction direction.

[0086] The total dry weight of the mixed aggregates is 1000 kg, and the total dry weight of the fine aggregates is 400 kg. When the stone powder in the fourth aggregate bin is replaced by a different batch, the screening parameters, moisture content, mud content, and MB results of that batch of stone powder are retested, and the data corresponding to the fourth aggregate bin in the original contribution relationship are replaced with the new batch parameters. Other aggregate bins continue to use the current valid batch parameters and basic dry weight.

[0087] Recalculate the expected throughput for each sieve aperture. The sieve apertures that effectively limit the substitution amount include the 1.18 mm, 0.6 mm, and 0.3 mm apertures. Other sieve apertures are checked using the same method, but their allowable substitution range is larger than that of the three apertures mentioned above, and therefore do not constitute effective boundaries for the substitution amount.

[0088] The target throughput range for a 0.6 mm sieve aperture is 28%–30%, with a projected throughput of 31% after the change; the target throughput range for a 1.18 mm sieve aperture is 43%–47%, with a projected throughput of 45%; and the target throughput range for a 0.3 mm sieve aperture is 16%–20%, with a projected throughput of 18%.

[0089] The expected throughput of the 0.6mm sieve aperture is 1 percentage point higher than the upper limit of the target range, and its target range width is 2 percentage points, with a ratio of 0.5. The other two sieve apertures are within the limits. The 0.6mm sieve aperture is designated as the target sieve aperture, and reducing the expected throughput of the 0.6mm sieve aperture is determined as the correction direction.

[0090] When all sieve openings are within the corresponding target throughput range, and the mixed mud content, the maximum allowable feed rate for the batch, and the feed range of the feeder all meet the requirements, no substitution is generated, and the basic feed parameters continue to be used.

[0091] Further, select two fine aggregate bins to participate in the substitution and determine the baseline substitution amount.

[0092] The current passing rate of tailings sand batches at a 0.6mm sieve is 25%, while the passing rate of the modified stone powder batches at a 0.6mm sieve is 70%. Since it is necessary to reduce the passing rate of the mixed aggregates at a 0.6mm sieve, the tailings sand silo with the lower passing rate is designated as the first fine aggregate silo, and the stone powder silo with the higher passing rate is designated as the second fine aggregate silo.

[0093] The first fine aggregate bin increases dry aggregate, the second fine aggregate bin decreases dry aggregate by the same amount, and the calculation of the corrective action is performed. A preferred scheme for the expected throughput of each sieve aperture is:

[0094]

[0095] in, Indicates the replacement of the mixed aggregate in the first... Expected pass rate at each sieve aperture This indicates the projected pass rate before the replacement. This indicates that the raw materials in the first fine aggregate bin are in the [number]th [location]. Pass rate at each sieve aperture This indicates that the raw materials in the second fine aggregate bin are in the... Pass rate at each sieve aperture Indicates the total dry weight of the mixed aggregates. This indicates the dry aggregate mass when the first fine aggregate bin increases and the second fine aggregate bin decreases by the same amount.

[0096] The specific process for determining the baseline replacement amount is as follows: the expected pass rate of the 0.6mm sieve needs to be reduced from 31% to at least 30%, which is a reduction of 1 percentage point; the pass rate of tailings sand and stone powder at the 0.6mm sieve differs by 45 percentage points; divide 1 percentage point by 45 percentage points, and then multiply by the total dry mass of 1000kg of mixed aggregate to obtain the baseline replacement amount of 22.22kg.

[0097] When calculating the total dry weight of fine aggregates, fine aggregates account for 40% of the total dry weight of mixed aggregates. A 1 percentage point change in the throughput of mixed aggregates corresponds to a 2.5 percentage point change in the fine aggregate portion. Dividing 2.5 percentage points by 45 percentage points and then multiplying by 400 kg of total dry weight of fine aggregates, we also get 22.22 kg.

[0098] When the throughput of two candidate fine aggregate bins at the target sieve aperture is equal, the substitution between the two bins cannot change the expected throughput of the target sieve aperture, and the candidate combination is excluded. When the throughput of the two bins is not equal but the baseline substitution amount exceeds the adjustable range of either bin, the baseline substitution amount is not directly implemented, but the allowable range of substitution amount under various constraints is further determined.

[0099] Furthermore, determine the allowable range of substitution and find the intersection.

[0100] For every 1 kg increase in tailings sand and an equal decrease of 1 kg in stone powder at a 0.6 mm sieve aperture, the expected passing rate of the mixed aggregate at the 0.6 mm sieve aperture decreases by 0.045 percentage points. To bring the expected passing rate from 31% into the target range of 28%–30%, the substitution amount must not be less than 22.22 kg and not more than 66.67 kg.

[0101] At a 1.18 mm sieve, the passing rates of tailings sand and stone powder are 55% and 90%, respectively. For every 1 kg replaced, the expected passing rate of the mixed aggregate at the 1.18 mm sieve decreases by 0.035 percentage points. The expected passing rate before correction is 45%, and the target passing rate range is 43%–47%, therefore the replacement amount must not exceed 57.14 kg.

[0102] At a 0.3 mm sieve, the passing rates of tailings sand and stone powder are 10% and 45%, respectively. For every 1 kg replaced, the expected passing rate of the mixed aggregate at the 0.3 mm sieve decreases by 0.035 percentage points. The expected passing rate before correction is 18%, and the target passing rate range is 16%–20%, therefore the replacement amount must not exceed 57.14 kg.

[0103] Before the correction, the mud content of the mixture was 2.86%, the mud content of the tailings sand was 1.3%, and the mud content of the stone powder was 15.5%. Increasing the tailings sand and decreasing the stone powder by the same amount would reduce the mud content of the mixture. Therefore, the upper limit of the mud content of the mixture does not constitute the upper boundary of the amount to be replaced in this case.

[0104] The dry weight of the tailings sand silo before correction is 120 kg, and its stable feeding range is 20 kg to 180 kg. Therefore, the increase in dry weight of the tailings sand must not exceed 60 kg. The dry weight of the stone powder silo before correction is 120 kg, and its stable feeding range is 20 kg to 180 kg. Therefore, the decrease in dry weight of the stone powder must not exceed 100 kg. Considering the feeding ranges of the two feeding devices, the corresponding substitution range for the feeding constraints is 0 to 60 kg.

[0105] By comparing the constraints of full-screen gradation, mixed mud content, batch allowable feed upper limit, and the allowable range corresponding to the feed range of the feeding equipment, the intersection of the candidate silo combination is found to be 22.22 kg to 57.14 kg. The intersection is not empty, indicating that the tailings sand silo and the stone powder silo can form an effective substitution relationship.

[0106] Within the intersection, the substitution amount is selected to bring the expected throughput of the 0.6mm sieve close to the midpoint of the target range. The midpoint of the target range is 29%, and reducing the expected throughput from 31% to 29% requires a reduction of 2 percentage points. Based on this, the effective substitution amount is determined to be 44.44 kg.

[0107] After the replacement, the dry tailings sand mass increased from 120 kg to 164.44 kg, while the dry stone powder mass decreased from 120 kg to 75.56 kg. The total dry mass of the two silos remained at 240 kg. The expected passing rates for the 0.6 mm sieve are 29%, for the 1.18 mm sieve are 43.44%, and for the 0.3 mm sieve are 16.44%. The mud content in the mixture is 2.23%, all meeting the corresponding constraints.

[0108] When the allowed interval intersection is empty, it is only determined that the current two fine aggregate bins cannot form an effective substitution relationship. The calculation continues for other fine aggregate bin combinations that can produce the same correction direction. It is not possible to directly restrict the feeding of raw material batches that have changed based on this.

[0109] Furthermore, a target alternative combination is determined from multiple effective silo combinations.

[0110] For constraints with upper and lower limits, determine the distances between the corrected result and the upper and lower limits respectively, take the smaller distance, and divide it by the corresponding allowable range width to obtain the residual margin of the corresponding constraint. For constraints with only an upper limit, divide the distance between the upper limit and the corrected result by the upper limit to obtain the residual margin of the corresponding constraint.

[0111] After replacing the tailings sand silos and stone powder silos with a capacity of 44.44 kg, the remaining margin is 0.5 for 0.6 mm sieves, 0.111 for 1.18 mm sieves, and 0.111 for 0.3 mm sieves. The remaining margin for the tailings sand feeding range is 0.097, and the remaining margin for the stone powder feeding range is 0.347. Taking the minimum value among these values, the minimum remaining margin for this silo combination is 0.097.

[0112] Other candidate silo combinations were calculated using the same method. The intersection of the substitution amounts for the manufactured sand silo and the stone powder silo was 28.57 kg to 40 kg, and the effective substitution amount reached the upper limit of the allowable feed of the manufactured sand silo, with a minimum remaining margin of 0. The intersection of the allowable ranges for the small yellow sand silo and the stone powder silo was empty.

[0113] After comparing the minimum remaining margin of each candidate silo combination, the tailings sand silo and stone powder silo were determined as the target replacement combination, and 44.44 kg was determined as the final replacement amount.

[0114] The final corrected dry feed parameters are as follows: 164.44 kg for tailings sand bin, 75.56 kg for stone powder bin, and the basic dry feed mass for other fine aggregate bins remains unchanged. The three coarse aggregate bins maintain a relative mass ratio of 2:5:3. Based on the current moisture content of the two fine aggregate bins, the corrected dry feed mass is converted into a wet feed mass and issued to the corresponding feeding equipment.

[0115] Example 3

[0116] Reference Figure 3 As an embodiment of the present invention, a specific implementation method is provided for the sequential correction when at least two sieve holes simultaneously cross the boundary in the tailings mixed aggregate fully continuous gradation proportion design method, as well as the limited feeding and stopping feeding when there is no effective substitute.

[0117] To determine the correction sequence for multiple target sieve openings, first calculate the first... The normalized out-of-bounds value of the nth sieve aperture is used to calculate the th... A preferred scheme for the normalized out-of-bounds value of each sieve aperture is:

[0118]

[0119] in, Indicates the first Normalized out-of-bounds value for each sieve aperture, Indicates the first The expected pass rate of each sieve hole before correction This indicates the upper limit of the corresponding target pass rate range. This indicates the lower limit of the corresponding target pass rate range.

[0120] When the expected pass rate is within the target range, the normalized out-of-bounds value is 0; when the expected pass rate is higher than the upper limit or lower than the lower limit, the normalized out-of-bounds value is the ratio of the value exceeding the corresponding boundary to the width of the target range.

[0121] The target throughput range for a 0.6mm sieve aperture is 28%–30%, with an expected throughput of 31.2% and a normalized out-of-bounds value of 0.6. The target throughput range for a 0.3mm sieve aperture is 16%–20%, with an expected throughput of 22% and a normalized out-of-bounds value of 0.5. Therefore, the 0.6mm sieve aperture is first determined as the current target aperture, and then the 0.3mm sieve aperture is processed.

[0122] The 0.6mm sieve aperture was first corrected by increasing tailings sand and reducing stone powder by an equal amount. The initial replacement amount was determined to be 48.89 kg, which reduced the expected passing rate of the 0.6mm sieve aperture from 31.2% to 29%. After the first correction was completed, the 0.6mm sieve aperture was added to the corrected sieve aperture set.

[0123] The first correction simultaneously reduced the expected pass rate of the 0.3mm sieve aperture from 22% to 21.02%, but it was still higher than the upper limit of 20%, so the 0.3mm sieve aperture was determined as the next target sieve aperture.

[0124] Furthermore, the deviation of the next target sieve hole is corrected, and the corrected sieve hole is kept from going out of bounds again.

[0125] When performing a second correction on a 0.3mm sieve, the expected pass rate of the 0.6mm sieve is maintained within the range of 28% to 30% as an additional constraint. This additional constraint, together with the target range for the 0.3mm sieve, the target range for other sieves, the upper limit for the mixed mud content, the upper limit for batch allowable feed, and the feed range of the feeder, are used to determine the allowable range for the second substitution amount.

[0126] The second corrective action involved increasing the amount of manufactured sand and decreasing the amount of fine yellow sand by the same amount. The passing rates of this batch of manufactured sand and fine yellow sand at a 0.3mm sieve were 20% and 80%, respectively, and the passing rates at a 0.6mm sieve were 50% and 90%, respectively.

[0127] The expected pass rate through a 0.3mm sieve needs to be reduced from at least 21.02% to 20%, a reduction of 1.02 percentage points. The pass rates of manufactured sand and fine yellow sand at the 0.3mm sieve differ by 60 percentage points. Dividing 1.02 percentage points by 60 percentage points and then multiplying by the total dry mass of 1000kg of mixed aggregate yields a second substitution amount of 17.03kg.

[0128] After replacing 17.03 kg, the expected pass rate of the 0.3 mm sieve aperture decreased to 20%, and the expected pass rate of the 0.6 mm sieve aperture decreased from 29% to 28.32%, still within the target range of 28% to 30%. Therefore, the second replacement amount simultaneously meets both the current target sieve aperture constraint and the additional constraint of the already corrected sieve aperture.

[0129] After the second correction is completed, the 0.3mm sieve aperture is added to the corrected sieve aperture set, and the expected passing rate, mud content, and feed rate of each silo for all sieve apertures are recalculated. If all constraints are met, the feed parameters after the two corrections are output; if the second correction causes the 0.6mm sieve aperture to exceed the limit again, the corresponding replacement amount is excluded, and another fine aggregate silo combination is selected.

[0130] When the normalized out-of-bounds values ​​of two out-of-bounds screen holes are the same, the screen hole with the smaller target range width is processed first; when the target range width is still the same, the difference in throughput of candidate fine aggregate bins at the two screen holes is compared, and the screen hole with the larger throughput difference is processed first.

[0131] Furthermore, a limit on the feed rate is determined when no effective alternative is available.

[0132] When the intersection of the allowable intervals corresponding to all candidate fine aggregate bin combinations is empty, keep the basic feeding parameters of other aggregate bins unchanged, and determine the upper limit of dry material feeding for the batch that has changed according to the gradation constraints of each sieve and the mud content constraints of the mixture.

[0133] In a limited feeding scenario, excluding the changed stone powder batch, the total dry mass of other silos is 880 kg, the total mass of mud brought in from other silos is 10 kg, the mud content of the changed stone powder batch is 20%, and the upper limit of the mixed mud content is 3%.

[0134] Specifically, the maximum allowable mud content is obtained by multiplying the maximum mud content of the mixed aggregate (3%) by the total dry mass of the mixed aggregate after adding stone powder; then, the 10kg mud mass already introduced from other silos is deducted; the remaining mud capacity is divided by the difference between the mud content of the changed stone powder and the maximum mud content of the mixed aggregate, resulting in a maximum dry feed limit of 96.47kg for this batch of stone powder.

[0135] Next, calculate the upper limit of dry material feed for this batch of stone powder according to the target passing rate range of each sieve opening. When the upper limit of feed calculated for each sieve opening is not less than 96.47 kg, 96.47 kg is determined as the limit feed amount for this batch of stone powder.

[0136] The minimum stable dry material feed rate of the stone powder feeding equipment is 20 kg, and the feed rate is limited to 96.47 kg, not less than 20 kg. Therefore, the stone powder batch is fed in a limited quantity of no more than 96.47 kg. After the limited feeding, the expected passing rate of all sieve openings and the mixed mud content are recalculated. When the recalculation results meet all constraints, the feed parameters after the limitation are output.

[0137] If, after limiting the feeding quantity, there are still screen openings exceeding the limit, the limited feeding quantity will not be enforced. Instead, the upper limit of the feeding quantity for that batch will be further reduced and rechecked. If the constraint cannot be met even when the quantity is reduced to the minimum stable feeding quantity of the feeding equipment, that batch will be stopped from participating in the feeding process.

[0138] Furthermore, stop feeding batches of raw materials that cannot consistently adhere to the limited feed rate.

[0139] The passing rate of the varied batch at the 0.15mm sieve aperture was 95%. The total dry material mass of other silos was 880kg, and the passing mass of other silos at the 0.15mm sieve aperture was 94kg. The maximum passing rate of this sieve aperture was 12%.

[0140] Specifically, multiply the upper limit of 12% of the 0.15mm sieve aperture by the total dry material mass after adding the changed batch to obtain the maximum mass allowed to pass through the 0.15mm sieve aperture; then deduct the 94kg passing mass already formed in other silos; based on the 95% passing rate of the changed batch at the 0.15mm sieve aperture, determine that the feed amount of this batch of dry material should not exceed 13.98kg.

[0141] Since the minimum stable dry material feeding rate of the corresponding feeding equipment is 20 kg, and 13.98 kg is lower than 20 kg, the feeding equipment cannot stably execute this limited feeding rate. Therefore, the feeding parameter of the corresponding silo is set to zero, and this batch of raw materials is stopped from participating in the feeding.

[0142] After feeding is stopped, the executable mix proportion is recalculated based on the raw material batch parameters of the remaining silos. If the remaining silos can form a mix proportion that meets the requirements of full-screen gradation, clay content, and feeding constraints, the recalculated feeding parameters are output; if the remaining silos cannot form an executable mix proportion, the current mixed aggregate production task is suspended until the raw material batch is changed or fine aggregate that can form an effective substitution relationship is added.

[0143] Example 4

[0144] Reference Figure 4 As an embodiment of the present invention, a tailings mixed aggregate fully continuous gradation and proportioning design system is provided, including: parameter acquisition module 1, feeding module 2, and processing module 3.

[0145] The processing module 3 is connected to the parameter acquisition module 1 and the feeding module 2.

[0146] The parameter acquisition module 1 is used to acquire the raw material batch parameters of each aggregate bin.

[0147] Processing module 3 is used to determine the basic mixing ratio, including the coarse aggregate protection ratio and the fine aggregate ratio containing tailings sand, based on the raw material batch parameters, and convert the basic mixing ratio into the basic feeding parameters of each aggregate bin.

[0148] Processing module 3 is also used to determine the target screen aperture deviation when the raw material batch parameters of the fine aggregate bins change, while keeping the relative mass ratio between each coarse aggregate bin unchanged. The increase or decrease of equal dry material between the two fine aggregate bins involved in the substitution is taken as the same substitution amount. The allowable range of the substitution amount under the constraints of full screen aperture gradation, clay content and feed is determined respectively. The intersection of each allowable range is calculated. Based on the intersection and the remaining margin between the correction result and each constraint boundary, the target substitution combination and the effective substitution amount are determined.

[0149] The feeding module 2 is used to correct the basic feeding parameters of the two fine aggregate bins in the target substitution combination according to the effective substitution amount, and when there is no effective substitution amount, it restricts the corresponding raw material batch to participate in feeding according to the limited feeding amount determined by the processing module 3.

[0150] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for designing a fully continuous gradation mix proportion of tailings mixed aggregate, characterized in that, include: The basic mixing ratio is determined based on the raw material batch parameters of each aggregate bin, and the basic mixing ratio is converted into the basic feeding parameters of each aggregate bin. When the raw material batch parameters of the fine aggregate bins change, the substitution amount between the fine aggregate bins is determined, and the corresponding basic feed parameters are adjusted based on the substitution amount; wherein... The basic mixing ratio includes: coarse aggregate protection ratio and fine aggregate ratio containing tailings sand. The coarse aggregate protection ratio is determined according to the packing parameters of each coarse aggregate. When correcting the basic feeding parameters, the relative mass ratio between each coarse aggregate bin is maintained. The substitution amount includes: determining the substitution amount based on the target sieve aperture deviation caused by changes in raw material batch parameters; ensuring that the total dry mass between the fine aggregate bins participating in the substitution remains unchanged; and ensuring that the mixed aggregate after substitution satisfies the full sieve aperture gradation constraint, clay constraint, and feeding constraint. When there is no substitution amount that satisfies the full sieve aperture gradation constraint, clay constraint, and feeding constraint, the corresponding raw material batch is restricted from participating in the feeding.

2. The tailings mixed aggregate fully continuous gradation proportioning design method according to claim 1, characterized in that, The raw material batch parameters include: Screening parameters, moisture content, clay characterization parameters, and packing parameters; The dry mass of each aggregate bin is determined based on the moisture content. Based on the dry mass of each aggregate bin and the screening parameters, the contribution of each aggregate bin to the synthesis pass rate of different sieve openings is determined. The mud characterization parameters include mud content and MB results. Mud content is used to determine the mixed mud content, and MB results are used to determine the upper limit of allowable feed for the corresponding raw material batch.

3. The tailings mixed aggregate fully continuous gradation proportioning design method according to claim 2, characterized in that, The coarse aggregate protection ratio includes: Based on the screening parameters of each coarse aggregate, candidate coarse aggregate proportions are generated. The mixed bulk density of the candidate coarse aggregate proportions that meet the gradation constraints of the coarse aggregate section is determined. The relative mass ratio between each coarse aggregate in the candidate coarse aggregate proportion with the largest mixed bulk density is determined as the coarse aggregate protection proportion.

4. The tailings mixed aggregate fully continuous gradation proportioning design method according to claim 3, characterized in that, The full sieve gradation constraint includes: The target throughput range for each sieve hole is determined based on the changed raw material batch parameters and basic feeding parameters. The expected throughput of each sieve hole is then calculated. The ratio of the expected throughput exceeding the boundary of the corresponding target throughput range to the width of the target throughput range is calculated. The sieve hole with the largest ratio is determined as the target sieve hole. The deviation of the target sieve hole and the direction of correction are determined based on the boundary exceeded by the expected throughput.

5. The tailings mixed aggregate fully continuous gradation proportioning design method according to claim 4, characterized in that, The baseline values ​​for the substitution amount include: When the expected throughput of the target screen aperture is higher than the corresponding target throughput range, the fine aggregate bin with the lower target screen aperture throughput is designated as the first fine aggregate bin, and the fine aggregate bin with the higher target screen aperture throughput is designated as the second fine aggregate bin. When the expected throughput of the target screen aperture is lower than the corresponding target throughput range, the fine aggregate bin with the higher target screen aperture throughput is designated as the first fine aggregate bin, and the fine aggregate bin with the lower target screen aperture throughput is designated as the second fine aggregate bin. The baseline substitution amount is determined based on the target sieve aperture deviation, the total dry mass of fine aggregate, and the difference in the pass rate between the first and second fine aggregate bins at the target sieve aperture.

6. The tailings mixed aggregate fully continuous gradation proportioning design method according to claim 5, characterized in that, The feeding constraints include: The feeding range of the feeding equipment corresponding to the first and second fine aggregate bins; The increase in dry material in the first fine aggregate bin and the decrease in dry material in the second fine aggregate bin are taken as the same substitution amount. The substitution amount is determined in the range of target passing rate, upper limit of mixed mud content, upper limit of allowable feed of corresponding raw material batch and feed range of corresponding feed equipment for each screen hole, and the intersection of each allowable interval is calculated. When the intersection is not empty, determine the effective substitution amount that minimizes the target sieve hole deviation from the intersection. When the intersection is empty, it is determined that the first fine aggregate bin and the second fine aggregate bin cannot form a valid substitution relationship.

7. The tailings mixed aggregate fully continuous gradation proportioning design method according to claim 6, characterized in that, The selection of the effective substitution amount includes: For different combinations of fine aggregate bins, the corresponding allowable interval intersection and effective substitution amount are determined. Based on the correction results corresponding to each effective substitution amount, the expected passing rate of each screen, the mud content of the mixture, and the remaining margin of the feeding parameters relative to the corresponding constraint boundary are determined. The combination of fine aggregate bins with the largest minimum surplus margin is determined as the target substitution combination, and the effective substitution amount corresponding to the target substitution combination is determined as the substitution amount used to correct the basic feed parameters.

8. The tailings mixed aggregate fully continuous gradation proportioning design method according to claim 7, characterized in that, The target sieve aperture deviation includes: At least two target sieve apertures correspond to target sieve aperture deviations respectively. Correction of target sieve apertures includes: correcting the apertures in descending order of the ratio by which the expected pass rate of each target sieve aperture exceeds the corresponding target pass rate range; After completing the correction of the current target sieve hole, the current target sieve hole is added to the set of corrected sieve holes. When determining the allowable range of the substitution amount corresponding to the next target sieve hole, the corrected sieve holes are kept within the range of the corresponding target pass rate as an additional constraint.

9. The tailings mixed aggregate fully continuous gradation proportioning design method according to claim 8, characterized in that, The restrictions on the feeding of corresponding raw material batches include: Limited feeding and stopped feeding: When the intersection of the allowable intervals corresponding to different fine aggregate bin combinations is empty, under the condition that the basic feeding parameters of other aggregate bins remain unchanged, the upper limit of dry material feeding for the changed raw material batch is determined according to the target passing rate range and the upper limit of mixed mud content corresponding to each screen hole, and the minimum value among the upper limits of dry material feeding is determined as the limited feeding amount of the raw material batch. When the restricted feed rate is not lower than the minimum feed rate of the corresponding feeding equipment, the raw material batch shall be fed in a limited quantity according to the restricted feed rate. When the feed rate is lower than the minimum feed rate of the corresponding feeder, the batch of raw materials is stopped from participating in the feeding.

10. A fully continuous gradation and proportioning design system for tailings mixed aggregates, characterized in that, include: Parameter acquisition module (1), feeding module (2), processing module (3); The processing module (3) is connected to the parameter acquisition module (1) and the feeding module (2); The parameter acquisition module (1) is used to acquire the raw material batch parameters of each aggregate bin; The processing module (3) is used to determine the basic mixing ratio, including the coarse aggregate protection ratio and the fine aggregate ratio containing tailings sand, based on the raw material batch parameters, and convert the basic mixing ratio into the basic feeding parameters of each aggregate bin; The processing module (3) is also used to determine the target screen hole deviation when the raw material batch parameters of the fine aggregate bins change, while keeping the relative mass ratio between each coarse aggregate bin unchanged. The equal dry material increase or decrease between the two fine aggregate bins involved in the substitution is taken as the same substitution amount. The allowable range of the substitution amount under the constraints of full screen hole gradation, clay content and feed is determined respectively. The intersection of each allowable range is calculated. The target substitution combination and effective substitution amount are determined based on the intersection and the remaining margin between the correction result and each constraint boundary. The feeding module (2) is used to correct the basic feeding parameters of the two fine aggregate bins in the target substitution combination according to the effective substitution amount, and when there is no effective substitution amount, it restricts the corresponding raw material batch to participate in feeding according to the limited feeding amount determined by the processing module (3).

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