Method for calculating H2SO4 addition amount based on P2O5 grade of phosphate rock

Abstract

The application discloses a method for calculating H2SO4 addition amount based on P2O5 grade of phosphate ore, and relates to the technical field of wet-process phosphoric acid production, which comprises the following steps: collecting the volume flow value of phosphate ore slurry and a representative sample of the phosphate ore slurry; analyzing the representative sample of the phosphate ore slurry to obtain the P2O5 grade of the phosphate ore, the volume density value of the phosphate ore slurry and the solid content value of the phosphate ore slurry; calculating the phosphate ore quantity through a phosphate ore quantity formula; constructing a regression analysis mathematical model and calculating the sulfuric acid addition amount through a regression analysis formula; calculating the H2SO4 volume flow through the sulfuric acid addition amount and the volume density of concentrated sulfuric acid, and realizing the adjustment effect of the sulfuric acid addition amount in the wet-process phosphoric acid extraction process through the H2SO4 volume flow. The application calculates the sulfuric acid consumption based on the P2O5 grade of the phosphate ore, avoids the phenomenon that the traditional CaO benchmark method leads to excessive waste of the sulfuric acid addition amount when the calcium-phosphorus ratio of the ore source increases, effectively inhibits the invalid acid consumption, realizes the precise control of the sulfuric acid addition, and reduces the production cost.

Description

Technical Field

[0001] This invention relates to the field of wet-process phosphoric acid production technology, specifically a method for calculating the amount of H2SO4 to be added based on the P2O5 grade of phosphate rock. Background Technology

[0002] Phosphate rock is the core raw material for wet-process phosphoric acid production. Its main useful component is calcium phosphate, but it inevitably contains calcium and magnesium carbonate impurities such as dolomite and calcite. In the wet-process phosphoric acid production process, the amount of sulfuric acid added directly determines the decomposition efficiency of the phosphate rock and the phosphorus recovery rate.

[0003] In traditional wet-process phosphoric acid production, the theoretical amount of sulfuric acid to be added is often calculated chemically based on the CaO content in the phosphate rock to determine the required amount. However, in recent years, with the increasing depletion of high-grade phosphate rock resources, the grade of the raw phosphate rock entering the extraction reactor has declined to around 27%, and the mass ratio of CaO to P2O5 (calcium-to-phosphorus ratio) has gradually increased to around 1.45. This increase in ratio means a significant increase in the proportion of ineffective calcium gangue in the ore. Under these circumstances, if the traditional CaO-based method is continued to be used to calculate the amount of sulfuric acid to be added, it will lead to an excessive amount of sulfuric acid, resulting in raw material waste and increased costs. The lower the grade of the phosphate rock entering the extraction reactor, the greater the amount of H2SO4 to be added, and the more serious the over-addition.

[0004] The basic principle of wet-process phosphoric acid production is to decompose phosphate rock by adding sulfuric acid, which produces phosphoric acid (H3PO4) and calcium sulfate (CaSO4). 4） Therefore, there is an objective intrinsic relationship between the P2O5 grade in phosphate rock and the amount of sulfuric acid used. By calculating the amount of H2SO4 added based on the P2O5 grade of phosphate rock, the traditional method of calculating the amount of H2SO4 based on CaO can be avoided, which leads to increased acid consumption and waste due to the deterioration of the ore source and the increase in the calcium-phosphorus ratio. This allows for the calculation and addition of sulfuric acid.

[0005] Based on this, a method for calculating the amount of H2SO4 to be added based on the P2O5 grade of phosphate rock is now provided, which can eliminate the drawbacks of existing technical solutions. Summary of the Invention

[0006] The purpose of this invention is to provide a method for calculating the amount of H2SO4 to be added based on the P2O5 grade of phosphate rock, so as to solve the problems in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A method for calculating the amount of H2SO4 to be added based on the P2O5 grade of phosphate rock, applied to the wet phosphoric acid extraction process, specifically includes the following steps: Step S1: The volumetric flow rate of phosphate rock slurry is collected in real time through the built-in flow sensing unit of the phosphate rock slurry delivery pipeline, and representative sample of phosphate rock slurry is collected simultaneously through the phosphate rock slurry delivery pipeline. Step S2: Analyze the representative sample of the phosphate rock slurry. Determine the chemical composition of the phosphate rock using an X-ray fluorescence spectrometer and a phosphorus content analyzer to obtain the P2O5 grade of the phosphate rock. Determine the bulk density of the phosphate rock slurry using the specific gravity bottle method to obtain the bulk density value of the phosphate rock slurry. Determine the solid content of the phosphate rock slurry using the drying and weighing method to obtain the solid content value of the phosphate rock slurry. Step S3: Based on the phosphate slurry volumetric flow rate, phosphate slurry volumetric density, and phosphate slurry solids content, the phosphate ore quantity is calculated using the phosphate ore quantity formula. Step S4: Construct a regression analysis mathematical model of sulfuric acid addition and phosphate rock P2O5 grade. Input the phosphate rock quantity and phosphate rock P2O5 grade into the regression analysis mathematical model, and calculate the sulfuric acid addition through the regression analysis formula. Step S5: The volumetric flow rate of H2SO4 is calculated by the amount of sulfuric acid added and the volumetric density of concentrated sulfuric acid. The volumetric flow rate of H2SO4 is used to adjust the amount of sulfuric acid added in the wet phosphoric acid extraction process.

[0008] Furthermore, the formula for the amount of phosphate rock in step S3 is expressed as follows: ,in, This refers to the quantity of phosphate rock, expressed in tons per hour (t / h). This is the volumetric flow rate of the phosphate rock slurry, in cubic meters (m³). 3 / h, This is the bulk density value of phosphate rock slurry, in t / m³. 3 , The solids content of phosphate rock slurry is expressed in percentages.

[0009] Furthermore, the regression analysis formula in step S4 is expressed as: ,in, This refers to the quantity of phosphate rock. The regression coefficients represent the relationship between sulfuric acid dosage and the P2O5 grade of phosphate rock. This refers to the amount of sulfuric acid added, expressed in t / h. The value represents the P2O5 grade of phosphate rock, expressed in percent.

[0010] Further, in step S5, the volumetric flow rate of H2SO4 is calculated based on the amount of sulfuric acid added and the volumetric density of concentrated sulfuric acid. The formula for calculating the volumetric flow rate of H2SO4 is as follows: ,in, This is the hourly flow rate of sulfuric acid, in m³ / s. 3 / h, For the amount of sulfuric acid added, This refers to the bulk density of concentrated sulfuric acid, expressed in t / m³. 3 .

[0011] Furthermore, the volume density of the concentrated sulfuric acid is set to the volume density of concentrated sulfuric acid with a mass fraction of 98% at room temperature, and the value is 1.84. The room temperature is 20~25℃, and the regression analysis coefficient is 2.455.

[0012] Furthermore, the method uses a computing system to calculate the H2SO4 dosage. The computing system includes a front-end acquisition module and a central computing module. The front-end acquisition module is used to collect representative samples of phosphate rock slurry, obtain the volumetric flow rate of phosphate rock slurry, the P2O5 grade of phosphate rock, the volumetric density of phosphate rock slurry, and the solids content of phosphate rock slurry, and input the collected data into the central computing module. The central computing module performs the calculation of sulfuric acid dosage based on the obtained values ​​and the analysis results of the representative samples of phosphate rock slurry.

[0013] Furthermore, the front-end acquisition module includes a flow sensing unit, a sampling execution unit, a component detection unit, and a forwarding interface. The flow sensing unit is installed in the phosphate rock slurry conveying pipeline to acquire the volumetric flow rate of the phosphate rock slurry in real time. The sampling execution unit is fixedly installed in the phosphate rock slurry conveying pipeline to acquire representative phosphate rock slurry samples in the pipeline. The component detection unit is used to determine the phosphate rock P2O5 grade, phosphate rock slurry volumetric density, and phosphate rock slurry solids content of the representative phosphate rock slurry samples. The component detection unit uses an X-ray fluorescence spectrometer and a phosphorus content analyzer to determine the phosphate rock P2O5 grade, a specific gravity bottle method to determine the phosphate rock slurry volumetric density, and a drying and weighing method to determine the phosphate rock slurry solids content. The forwarding interface is used to uniformly upload the acquired phosphate rock slurry volumetric flow rate, phosphate rock P2O5 grade, phosphate rock slurry volumetric density, and phosphate rock slurry solids content to the central processing module.

[0014] Furthermore, the central computing module includes a data input unit, a phosphate rock quantity calculator, a regression relationship storage and retrieval calculator, a sulfuric acid volumetric flow rate calculator, and a data output unit. The data input unit receives the acquired values ​​from the front-end acquisition module and the analysis results of representative phosphate rock slurry samples. The phosphate rock quantity calculator multiplies the phosphate rock slurry volumetric flow rate, phosphate rock slurry volumetric density, and phosphate rock slurry solids content to obtain the phosphate rock quantity. The regression relationship storage and retrieval calculator takes the phosphate rock P2O5 grade and phosphate rock quantity as input and uses a pre-stored regression analysis formula to calculate the sulfuric acid dosage. The sulfuric acid volumetric flow rate calculator calculates the H2SO4 volumetric flow rate based on the sulfuric acid dosage and the concentrated sulfuric acid volumetric density. The data output unit outputs the H2SO4 volumetric flow rate, thereby achieving the adjustment effect of sulfuric acid dosage in the wet phosphoric acid extraction process.

[0015] Furthermore, the phosphate rock quantity calculator stores the phosphate rock quantity formula, the regression relationship storage and recall calculator stores the regression analysis formula of the regression analysis mathematical model, and the sulfuric acid volume flow rate calculator stores the H2SO4 volume flow rate calculation formula.

[0016] Furthermore, the construction process of the regression analysis mathematical model is as follows: collect several sets of data on the P2O5 grade of phosphate rock and the corresponding actual sulfuric acid addition during the historical phosphoric acid production process, perform regression analysis on the data on the P2O5 grade of phosphate rock and the actual sulfuric acid addition, and establish a regression analysis mathematical model on the change of H2SO4 addition and the P2O5 grade of phosphate rock with the P2O5 grade of phosphate rock as the independent variable and the sulfuric acid addition as the dependent variable.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention calculates the amount of sulfuric acid based on the P2O5 grade of phosphate rock, avoiding the phenomenon of excessive sulfuric acid addition and waste caused by the traditional CaO-based method when the calcium-phosphorus ratio of the ore increases, thereby achieving accurate calculation and addition of sulfuric acid. 2. This invention has a regression analysis mathematical model. The calculation results can maintain the objective constraints of the chemical reaction principle and adapt to changes in ore grade. Even under the trend of ore deterioration and continuous increase in calcium-phosphorus ratio, it can still output a suitable amount of sulfuric acid, effectively suppress ineffective acid consumption, reduce sulfuric acid usage, save costs, and have good economic benefits. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the steps of the present invention.

[0019] Figure 2 This is a schematic diagram of the linear regression fitting curve of the present invention.

[0020] Figure 3 This is a schematic diagram of the system architecture of the present invention.

[0021] Figure label annotations: Front-end acquisition module 10, flow sensing unit 11, sampling execution unit 12, component detection unit 13, forwarding interface 14, central processing module 20, data input unit 21, phosphate rock quantity calculator 22, regression relationship storage and retrieval calculator 23, sulfuric acid volume flow rate calculator 24, data output unit 25. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] To address the problem of increased acid consumption and waste caused by the traditional method of calculating H2SO4 dosage based on CaO due to the deterioration of ore sources and the resulting increase in calcium-to-phosphorus ratio, this paper considers that the basic principle of wet phosphoric acid production is to add sulfuric acid to decompose phosphate rock, reacting to produce phosphoric acid (H3PO4) and calcium sulfate (CaSO4). 4） This indicates an objective, intrinsic relationship between the P2O5 grade in phosphate rock and the amount of sulfuric acid used. The P2O5 grade of phosphate rock determines the amount of sulfuric acid used. Therefore, this invention focuses on finding the relationship coefficient between the amount of sulfuric acid used and the P2O5 grade of phosphate rock. Based on historical production data, it uses mathematical statistical regression analysis to determine the regression coefficient between the amount of sulfuric acid used and the P2O5 grade of phosphate rock. A mathematical model is established based on the P2O5 grade of phosphate rock for the addition of H2SO4 and the P2O5 grade of phosphate rock, thereby achieving accurate calculation and addition of sulfuric acid. The specific technical solution is shown below.

[0024] like Figure 1 As shown, this invention provides a method for calculating the amount of H2SO4 to be added based on the P2O5 grade of phosphate rock, applied to the wet phosphoric acid extraction process. The method specifically includes the following steps: Step S1: The volumetric flow rate of phosphate slurry is collected in real time through the built-in flow sensing unit 11 in the phosphate slurry delivery pipeline, and representative phosphate slurry sample is collected simultaneously through the phosphate slurry delivery pipeline. Step S2: Analyze representative samples of phosphate rock slurry. Determine the chemical composition of phosphate rock using X-ray fluorescence spectrometer and phosphate content analyzer to obtain the P2O5 grade of phosphate rock. Determine the bulk density of phosphate rock slurry using the specific gravity bottle method to obtain the bulk density value of phosphate rock slurry. Determine the solid content of phosphate rock slurry using the drying and weighing method to obtain the solid content value of phosphate rock slurry. Step S3: Based on the phosphate slurry volumetric flow rate, phosphate slurry volumetric density, and phosphate slurry solids content, the phosphate ore quantity is calculated using the phosphate ore quantity formula. The formula for the amount of phosphate rock in this step is expressed as follows: ,in, This refers to the quantity of phosphate rock, expressed in tons per hour (t / h). This is the volumetric flow rate of the phosphate rock slurry, in cubic meters (m³). 3 / h, This is the bulk density value of phosphate rock slurry, in t / m³. 3 , The solids content of the phosphate rock slurry is expressed in % (%). Step S4: Construct a regression analysis mathematical model of sulfuric acid addition and phosphate rock P2O5 grade. Input the phosphate rock quantity and phosphate rock P2O5 grade into the regression analysis mathematical model, and calculate the sulfuric acid addition through the regression analysis formula. The regression analysis formula in this step is expressed as follows: ,in, This refers to the quantity of phosphate rock. The regression coefficient is 2.455, which represents the relationship between the amount of sulfuric acid added and the P2O5 grade of the phosphate rock. This refers to the amount of sulfuric acid added, expressed in t / h. The P2O5 grade of phosphate rock is expressed in percentages (%). Step S5: Calculate the H2SO4 volume flow rate by the amount of sulfuric acid added and the volume density of concentrated sulfuric acid. The H2SO4 volume flow rate is used to adjust the amount of sulfuric acid added in the wet phosphoric acid extraction process. Adjust the amount of sulfuric acid added in the wet phosphoric acid extraction process according to the H2SO4 volume flow rate. In this step, the volumetric flow rate of H2SO4 is calculated based on the amount of sulfuric acid added and the bulk density of concentrated sulfuric acid. The formula for calculating the volumetric flow rate of H2SO4 is as follows: ,in, This is the hourly flow rate of sulfuric acid, in m³ / s. 3 / h, For the amount of sulfuric acid added, This refers to the bulk density of concentrated sulfuric acid, expressed in t / m³. 3 The volume density of concentrated sulfuric acid is set to the volume density of 98% concentrated sulfuric acid at room temperature, with a value of 1.84 and a room temperature of 20~25℃. Specifically, the analytical methods, equipment, principles, and parameters mentioned above are all standard analytical methods, equipment, and principles in the field of wet-process phosphoric acid production. They are analyzed and tested by the central laboratory in accordance with national standards or industry regulations. All analytical and testing data involved in this manual are provided by the central laboratory.

[0025] Specifically, the process of constructing the regression analysis mathematical model is as follows: collect several sets of data on the P2O5 grade of phosphate rock and the corresponding actual sulfuric acid addition during the historical phosphoric acid production process, conduct regression analysis on the data on the P2O5 grade of phosphate rock and the actual sulfuric acid addition, and establish a regression analysis mathematical model on the change of H2SO4 addition and the P2O5 grade of phosphate rock with the P2O5 grade of phosphate rock as the independent variable and the sulfuric acid addition as the dependent variable. Example: Retrieve historical records and collect production data for the wet-process phosphoric acid production line from January 2024 to December 2025 for a total of 24 consecutive months, including phosphate rock slurry volumetric flow rate, phosphate rock slurry volumetric density, phosphate rock slurry P2O5 grade, phosphate rock slurry solids content, and corresponding actual sulfuric acid consumption. Perform a weighted average on a daily basis to generate 519 sets of average phosphate rock slurry P2O5 grade, phosphate rock quantity, and actual sulfuric acid consumption data. Plot the collected phosphate rock slurry P2O5 grade × phosphate rock quantity on the x-axis and the actual sulfuric acid consumption on the y-axis to generate a graph of 519 data points in a Cartesian coordinate system. Perform regression analysis on these 519 data points to obtain the regression coefficients. Therefore, a regression analysis mathematical model was obtained for the relationship between sulfuric acid dosage and P2O5 grade of phosphate rock slurry. The regression analysis formula is as follows: ,according to Add sulfuric acid ( ) and the P2O5 grade of phosphate rock ( Linear regression analysis was used to determine the amount of sulfuric acid to be added; The regression coefficients mentioned above are not absolute values ​​in a mathematical sense. Experiments have shown that if data from different time periods are used for re-regression, the regression coefficients obtained by fitting data from different time periods, different group sizes, and different months will not cause significant changes. The regression coefficients will all fluctuate slightly around the value of 2.455 (e.g., ...). Figure 3 As shown in the figure, this reflects the normal randomness of production data. The coefficient value of 2.455 is the coefficient value obtained by fitting 519 sets of data collected over two years and a total of 24 months. The sample size and time span selected in this invention are sufficient, so the regression coefficient obtained is relatively accurate. Therefore, the value of 2.455 is used as the regression analysis coefficient.

[0026] like Figure 3 As shown, the above method realizes the H2SO4 dosage calculation effect through a computing system. The computing system includes a front-end acquisition module 10 and a central computing module 20. The front-end acquisition module 10 is used to collect representative samples of phosphate rock slurry, obtain the volumetric flow rate of phosphate rock slurry, the P2O5 grade of phosphate rock, the volumetric density of phosphate rock slurry, and the solid content of phosphate rock slurry, and input the collected data into the central computing module 20. The central computing module 20 performs the sulfuric acid dosage calculation operation based on the obtained values ​​and the analysis results of the representative samples of phosphate rock slurry.

[0027] like Figure 3As shown, the front-end acquisition module 10 includes a flow sensing unit 11, a sampling execution unit 12, a component detection unit 13, and a forwarding interface 14. The flow sensing unit 11 is installed in the phosphate rock slurry conveying pipeline to acquire the volumetric flow rate of the phosphate rock slurry in real time. The sampling execution unit 12 is fixedly installed in the phosphate rock slurry conveying pipeline to acquire representative phosphate rock slurry samples in the pipeline. The component detection unit 13 is used to determine the phosphate rock P2O5 grade, phosphate rock slurry volume density, and phosphate rock slurry solids content of the representative phosphate rock slurry samples. The component detection unit 13 uses an X-ray fluorescence spectrometer and a phosphorus content analyzer to determine the phosphate rock P2O5 grade, a specific gravity bottle method to determine the phosphate rock slurry volume density, and a drying and weighing method to determine the phosphate rock slurry solids content. The forwarding interface 14 is used to uniformly upload the acquired phosphate rock slurry volumetric flow rate, phosphate rock P2O5 grade, phosphate rock slurry volume density, and phosphate rock slurry solids content to the central processing module 20.

[0028] like Figure 3 As shown, the central processing module 20 includes a data input unit 21, a phosphate rock quantity calculator 22, a regression relationship storage and retrieval calculator 23, a sulfuric acid volumetric flow rate calculator 24, and a data output unit 25. The data input unit 21 receives the acquired values ​​from the front-end acquisition module 10 and the analytical results of representative phosphate rock slurry samples. The phosphate rock quantity calculator 22 multiplies the phosphate rock slurry volumetric flow rate, phosphate rock slurry volumetric density, and phosphate rock slurry solids content to obtain the phosphate rock quantity. The phosphate rock quantity calculator 22 stores the phosphate rock quantity formula. The regression relationship storage and retrieval calculator 23... The inputs are the P2O5 grade and quantity of phosphate rock. The pre-stored regression analysis formula is used to calculate the amount of sulfuric acid added. The regression relationship storage and retrieval calculator 23 stores the regression analysis formula of the regression analysis mathematical model. The sulfuric acid volume flow rate calculator 24 is used to calculate the H2SO4 volume flow rate by the amount of sulfuric acid added and the volume density of concentrated sulfuric acid. The sulfuric acid volume flow rate calculator 24 stores the H2SO4 volume flow rate calculation formula. The data output unit 25 is used to output the H2SO4 volume flow rate, so as to realize the adjustment effect of sulfuric acid dosage in the wet phosphoric acid extraction process.

[0029] To further demonstrate the application value of the method for calculating H2SO4 dosage based on the P2O5 grade of phosphate rock in this invention, the actual effect of this invention is further illustrated below through specific experimental data. Several experimental examples are provided to demonstrate the algorithm flow and calculation formula in this invention, verifying its accuracy, operability, and consistency, as shown below.

[0030] Example 1

[0031] This embodiment uses the production data of the wet-process phosphoric acid process in a certain area from January 6th to January 12th, 2026 as an example to calculate the H2SO4 dosage using the above method, specifically including the following steps: Step S1: The volumetric flow rate of the phosphate slurry is collected in real time through the built-in flow sensor unit 11 in the phosphate slurry delivery pipeline. Representative samples of the phosphate slurry are also collected simultaneously using the pipeline. The demonstration uses production data from January 6th as an example: the volumetric flow rate of the phosphate slurry is... m 3 / h, actual sulfuric acid consumption in production m 3 / h; Step S2: Analyze representative samples of phosphate rock slurry. Determine the chemical composition of the phosphate rock using X-ray fluorescence spectrometry and a phosphorus content analyzer to obtain the P2O5 grade. Measure the bulk density of the phosphate rock slurry using the specific gravity bottle method to obtain the bulk density value. Determine the solids content of the phosphate rock slurry using the drying and weighing method to obtain the solids content value. Therefore, the P2O5 grade of the phosphate rock is: %, the bulk density of phosphate rock slurry is t / m 3 The solids content of the phosphate rock slurry is... % Step S3: After receiving the data, the data input unit 21 inputs the data into the phosphate rock quantity calculator 22. Based on the phosphate rock slurry volumetric flow rate, phosphate rock slurry volumetric density, and phosphate rock slurry solids content, the phosphate rock quantity is calculated using the phosphate rock quantity formula. t / h; Step S4: Construct a regression analysis mathematical model of sulfuric acid addition and phosphate rock P2O5 grade. Input the phosphate rock quantity and phosphate rock P2O5 grade into the regression analysis mathematical model. Use the regression relationship storage and retrieval calculator 23 to retrieve the phosphate rock quantity data. Calculate the sulfuric acid addition using the regression analysis formula. t / h; Step S5: After receiving the sulfuric acid dosage, the sulfuric acid volumetric flow rate calculator 24 calculates the H2SO4 volumetric flow rate based on the sulfuric acid dosage and the concentrated sulfuric acid volume density. m 3 / h, the volumetric flow rate of H2SO4 is used to adjust the amount of sulfuric acid added in the wet phosphoric acid extraction process; This embodiment also includes: the H2SO4 volumetric flow rate obtained from step S5 above. and the actual amount of sulfuric acid used in production Calculate the deviation ; The traditional formula for calculating the amount of sulfuric acid used with CaO is: ,in, The amount of sulfuric acid used is calculated using the CaO method, in units of m³. 3 / h, The value represents the mass percentage of CaO in the phosphate rock slurry, expressed as %, 98 and 56 represent the molar masses of H₂SO₄ and CaO, respectively, expressed as g / mol, and 1.84 represents the bulk density of 98% concentrated sulfuric acid at room temperature, expressed as t / m³. 3 ; Using production data from January 6th as an example: Analysis showed that the mass percentage of CaO in the phosphate rock slurry was 41.94%, and the amount of phosphate rock was... t / h, calculated as follows: For the calculated CaO dosage data (t / h), please refer to the actual sulfuric acid dosage in the table. The data from January 7th to January 12th, 2026 were calculated according to the example steps described above. The results are shown in Table 1. The actual sulfuric acid usage is the amount of sulfuric acid used in production calculated based on the traditional CaO method. This data directly reflects the calculation results of the traditional method. By comparing the amount of sulfuric acid used calculated by this invention with the actual amount of sulfuric acid used, the difference between the results of the two methods can be presented intuitively.

[0032] Table 1 - Sulfuric Acid Volume Flow Rate Actual sulfuric acid usage in production Comparison table

[0033] As shown in Table 1, the regression analysis mathematical model established in this invention has good accuracy, operability and consistency in calculating H2SO4, with deviation rates all within -3.00% and showing negative deviations. This indicates that the amount of sulfuric acid calculated using the traditional CaO method is excessive in actual production.

[0034] Example 2

[0035] This embodiment uses the production data of the wet-process phosphoric acid process in a certain area from March 5th to March 11th, 2026 as an example to calculate the H2SO4 dosage using the above method, specifically including the following steps: Step S1: The volumetric flow rate of the phosphate slurry is collected in real time through the built-in flow sensor unit 11 in the phosphate slurry delivery pipeline. Representative samples of the phosphate slurry are also collected simultaneously using the pipeline. The demonstration uses production data from March 5th as an example: the volumetric flow rate of the phosphate slurry is... m 3 / h, actual sulfuric acid consumption in production m 3 / h; Step S2: Analyze representative samples of phosphate rock slurry. Determine the chemical composition of the phosphate rock using X-ray fluorescence spectrometry and a phosphorus content analyzer to obtain the P2O5 grade. Measure the bulk density of the phosphate rock slurry using the specific gravity bottle method to obtain the bulk density value. Determine the solids content of the phosphate rock slurry using the drying and weighing method to obtain the solids content value. Therefore, the P2O5 grade of the phosphate rock is: %, the bulk density of phosphate rock slurry is t / m 3 The solids content of the phosphate rock slurry is... % Step S3: After receiving the data, the data input unit 21 inputs the data into the phosphate rock quantity calculator 22. Based on the phosphate rock slurry volumetric flow rate, phosphate rock slurry volumetric density, and phosphate rock slurry solids content, the phosphate rock quantity is calculated using the phosphate rock quantity formula. t / h; Step S4: Construct a regression analysis mathematical model of sulfuric acid addition and phosphate rock P2O5 grade. Input the phosphate rock quantity and phosphate rock P2O5 grade into the regression analysis mathematical model. Use the regression relationship storage and retrieval calculator 23 to retrieve the phosphate rock quantity data. Calculate the sulfuric acid addition using the regression analysis formula. t / h; Step S5: After receiving the sulfuric acid dosage, the sulfuric acid volumetric flow rate calculator 24 calculates the H2SO4 volumetric flow rate based on the sulfuric acid dosage and the concentrated sulfuric acid volume density. m 3 / h, the volumetric flow rate of H2SO4 is used to adjust the amount of sulfuric acid added in the wet phosphoric acid extraction process; This embodiment also includes: the H2SO4 volumetric flow rate obtained from step S5 above. and the actual amount of sulfuric acid used in production Calculate the deviation ; Using production data from March 5th as an example: Analysis showed that the mass percentage of CaO in the phosphate rock slurry was 40.61%, and the amount of phosphate rock was... t / h, calculated as follows: For the calculated CaO dosage data (t / h), please refer to the actual sulfuric acid dosage in the table. The data from March 5th to March 11th, 2026 were calculated using the steps described above, and the results are shown in Table 2.

[0036] Table 2 - Sulfuric Acid Volume Flow Rate Actual sulfuric acid usage in production Comparison table

[0037] Table 2 shows that the deviation rates are all within -3.00% and are negative, indicating that the amount of sulfuric acid used in actual production calculated using the traditional CaO method is excessive.

[0038] Example 3

[0039] This embodiment uses the production data of the wet-process phosphoric acid process in a certain area from June 1st to June 28th, 2026 as an example to calculate the H2SO4 dosage using the above method, specifically including the following steps: Step S1: The volumetric flow rate of phosphate slurry is collected in real time through the built-in flow sensing unit 11 in the phosphate slurry delivery pipeline, and representative phosphate slurry sample is collected simultaneously through the phosphate slurry delivery pipeline. Step S2: Analyze representative samples of phosphate rock slurry. Determine the chemical composition of phosphate rock using X-ray fluorescence spectrometry and a phosphorus content analyzer to obtain the P2O5 grade of phosphate rock. Determine the bulk density of phosphate rock slurry using the specific gravity bottle method. Determine the solid content of phosphate rock slurry using the drying and weighing method to obtain the solid content value of phosphate rock slurry. Take a weighted average of these discrete data over 7 production days to form 4 sets of average phosphate rock P2O5 grade, phosphate rock quantity, and actual sulfuric acid consumption in production. The demonstration uses production data from June 1st to June 7th as an example: the P2O5 grade of the phosphate rock is... %, the bulk density of phosphate rock slurry is t / m 3 The volumetric flow rate of the phosphate slurry is m 3 / h, actual sulfuric acid consumption in production m 3 / h, phosphate rock slurry solids content value % Step S3: After receiving the data, the data input unit 21 inputs the data into the phosphate rock quantity calculator 22. Based on the phosphate rock slurry volumetric flow rate, phosphate rock slurry volumetric density, and phosphate rock slurry solids content, the phosphate rock quantity is calculated using the phosphate rock quantity formula. t / h; Step S4: Construct a regression analysis mathematical model of sulfuric acid addition and phosphate rock P2O5 grade. Input the phosphate rock quantity and phosphate rock P2O5 grade into the regression analysis mathematical model. Use the regression relationship storage and retrieval calculator 23 to retrieve the phosphate rock quantity data. Calculate the sulfuric acid addition using the regression analysis formula. t / h; Step S5: After receiving the sulfuric acid dosage, the sulfuric acid volumetric flow rate calculator 24 calculates the H2SO4 volumetric flow rate based on the sulfuric acid dosage and the concentrated sulfuric acid volume density. m 3 / h, the volumetric flow rate of H2SO4 is used to adjust the amount of sulfuric acid added in the wet phosphoric acid extraction process; This embodiment also includes: the H2SO4 volumetric flow rate obtained from step S5 above. and the actual amount of sulfuric acid used in production Calculate the deviation ; Using production data from June 1st to June 7th as an example: Analysis showed that the mass percentage of CaO in the phosphate rock slurry was 40.74%, and the amount of phosphate rock was... t / h, calculated as follows: For the calculated CaO dosage data (t / h), please refer to the actual sulfuric acid dosage in the table. The data from June 1st to June 28th, 2026 were calculated using the steps described above, and the results are shown in Table 3.

[0040] Table 3 - Sulfuric Acid Volume Flow Rate Actual sulfuric acid usage in production Comparison table

[0041] Table 3 shows that the deviation rate is within -2.5% and is negative, indicating that the amount of sulfuric acid used in actual production calculated using the traditional CaO method is excessive.

[0042] In summary, this invention solves the practical problem of the inability to quickly respond to and accurately control the amount of sulfuric acid used due to changes in phosphate rock grade. Based on the phosphate rock P2O5 grade, historical actual production data was collected and summarized. Using the phosphate rock P2O5 grade as the independent variable and the sulfuric acid consumption as the dependent variable, a regression analysis mathematical model was established to correlate the amount of sulfuric acid added with the phosphate rock grade. Combined with the data from the examples, it can be seen that this invention is highly efficient and convenient in practical production applications, with precise dosage, achieving accurate control of H2SO4 consumption, and has good application prospects.

[0043] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included 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 calculating the amount of H2SO4 to be added based on the P2O5 grade of phosphate rock, characterized in that, The method, applied to the wet phosphoric acid extraction process, specifically includes the following steps: Step S1: The volumetric flow rate of phosphate rock slurry is collected in real time through the built-in flow sensing unit of the phosphate rock slurry delivery pipeline, and representative sample of phosphate rock slurry is collected simultaneously through the phosphate rock slurry delivery pipeline. Step S2: Analyze the representative sample of the phosphate rock slurry. Determine the chemical composition of the phosphate rock using an X-ray fluorescence spectrometer and a phosphorus content analyzer to obtain the P2O5 grade of the phosphate rock. Determine the bulk density of the phosphate rock slurry using the specific gravity bottle method to obtain the bulk density value of the phosphate rock slurry. Determine the solid content of the phosphate rock slurry using the drying and weighing method to obtain the solid content value of the phosphate rock slurry. Step S3: Based on the phosphate slurry volumetric flow rate, phosphate slurry volumetric density, and phosphate slurry solids content, the phosphate ore quantity is calculated using the phosphate ore quantity formula. Step S4: Construct a regression analysis mathematical model of sulfuric acid addition and phosphate rock P2O5 grade. Input the phosphate rock quantity and phosphate rock P2O5 grade into the regression analysis mathematical model, and calculate the sulfuric acid addition through the regression analysis formula. Step S5: The volumetric flow rate of H2SO4 is calculated by the amount of sulfuric acid added and the volumetric density of concentrated sulfuric acid. The volumetric flow rate of H2SO4 is used to adjust the amount of sulfuric acid added in the wet phosphoric acid extraction process.

2. The method for calculating H2SO4 dosage based on the P2O5 grade of phosphate rock according to claim 1, characterized in that, The formula for the amount of phosphate rock in step S3 is expressed as follows: ,in, This refers to the quantity of phosphate rock, expressed in tons per hour (t / h). This is the volumetric flow rate of the phosphate rock slurry, in cubic meters (m³). 3 / h, This is the bulk density value of phosphate rock slurry, in t / m³. 3 , The solids content of phosphate rock slurry is expressed in percentages.

3. The method for calculating H2SO4 dosage based on the P2O5 grade of phosphate rock according to claim 1, characterized in that, The regression analysis formula in step S4 is expressed as follows: ,in, This refers to the quantity of phosphate rock. The regression coefficients represent the relationship between sulfuric acid dosage and the P2O5 grade of phosphate rock. This refers to the amount of sulfuric acid added, expressed in t / h. The value represents the P2O5 grade of phosphate rock, expressed in percent.

4. The method for calculating H2SO4 dosage based on the P2O5 grade of phosphate rock according to claim 3, characterized in that, In step S5, the volumetric flow rate of H2SO4 is calculated based on the amount of sulfuric acid added and the bulk density of concentrated sulfuric acid. The formula for calculating the volumetric flow rate of H2SO4 is as follows: ,in, This is the hourly flow rate of sulfuric acid, in m³ / s. 3 / h, For the amount of sulfuric acid added, This refers to the bulk density of concentrated sulfuric acid, expressed in t / m³. 3 .

5. The method for calculating H2SO4 dosage based on the P2O5 grade of phosphate rock according to claim 4, characterized in that, The volume density of the concentrated sulfuric acid is set to the volume density of 98% concentrated sulfuric acid at room temperature, with a value of 1.

84. The room temperature is 20~25℃, and the regression analysis coefficient is 2.

455.

6. The method for calculating H2SO4 dosage based on the P2O5 grade of phosphate rock according to claim 1, characterized in that, The method achieves the H2SO4 dosage calculation effect through a computing system. The computing system includes a front-end acquisition module and a central computing module. The front-end acquisition module is used to collect representative samples of phosphate rock slurry, obtain the volumetric flow rate of phosphate rock slurry, the P2O5 grade of phosphate rock, the volumetric density of phosphate rock slurry, and the solids content of phosphate rock slurry, and input the collected data into the central computing module. The central computing module performs the sulfuric acid dosage calculation operation based on the obtained values ​​and the analysis results of the representative samples of phosphate rock slurry.

7. The method for calculating H2SO4 dosage based on the P2O5 grade of phosphate rock according to claim 6, characterized in that, The front-end acquisition module includes a flow sensing unit, a sampling execution unit, a component detection unit, and a forwarding interface. The flow sensing unit is installed in the phosphate rock slurry delivery pipeline to acquire the volumetric flow rate of the phosphate rock slurry in real time. The sampling execution unit is fixedly installed on the phosphate rock slurry delivery pipeline to acquire representative phosphate rock slurry samples from the pipeline. The component detection unit is used to determine the phosphate rock P2O5 grade, phosphate rock slurry volumetric density, and phosphate rock slurry solids content of the representative phosphate rock slurry samples. The component detection unit uses an X-ray fluorescence spectrometer and a phosphorus content analyzer to determine the phosphate rock P2O5 grade, a specific gravity bottle method to determine the phosphate rock slurry volumetric density, and a drying and weighing method to determine the phosphate rock slurry solids content. The forwarding interface is used to upload the acquired phosphate rock slurry volumetric flow rate, phosphate rock P2O5 grade, phosphate rock slurry volumetric density, and phosphate rock slurry solids content to the central processing module.

8. The method for calculating H2SO4 dosage based on the P2O5 grade of phosphate rock according to claim 6, characterized in that, The central processing module includes a data input unit, a phosphate rock quantity calculator, a regression relationship storage and retrieval calculator, a sulfuric acid volumetric flow rate calculator, and a data output unit. The data input unit receives the acquired values ​​from the front-end acquisition module and the analysis results of representative phosphate rock slurry samples. The phosphate rock quantity calculator multiplies the phosphate rock slurry volumetric flow rate, phosphate rock slurry volumetric density, and phosphate rock slurry solids content to obtain the phosphate rock quantity. The regression relationship storage and retrieval calculator takes the phosphate rock P2O5 grade and phosphate rock quantity as input and uses a pre-stored regression analysis formula to calculate the amount of sulfuric acid to be added. The sulfuric acid volumetric flow rate calculator calculates the H2SO4 volumetric flow rate based on the amount of sulfuric acid added and the concentrated sulfuric acid volumetric density. The data output unit outputs the H2SO4 volumetric flow rate, thereby achieving the adjustment effect of sulfuric acid dosage in the wet phosphoric acid extraction process.

9. The method for calculating H2SO4 dosage based on the P2O5 grade of phosphate rock according to claim 8, characterized in that, The phosphate rock quantity calculator stores the formula for phosphate rock quantity, the regression relationship storage and recall calculator stores the regression analysis formula for the regression analysis mathematical model, and the sulfuric acid volume flow rate calculator stores the formula for calculating the volume flow rate of H2SO4.

10. The method for calculating H2SO4 dosage based on the P2O5 grade of phosphate rock according to claim 1, characterized in that, The process of constructing the regression analysis mathematical model is as follows: collect several sets of data on the P2O5 grade of phosphate rock and the corresponding actual sulfuric acid addition during the historical phosphoric acid production process, perform regression analysis on the data on the P2O5 grade of phosphate rock and the actual sulfuric acid addition, and establish a regression analysis mathematical model on the change of H2SO4 addition and the P2O5 grade of phosphate rock with the P2O5 grade of phosphate rock as the independent variable and the sulfuric acid addition as the dependent variable.

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