Method for on-line detection of ferrous ion content in copper-coated iron powder wastewater

Abstract

The invention relates to the technical field of industrial wastewater on-line monitoring, in particular to a method for on-line detection of ferrous ion content in copper-coated iron powder wastewater, two digital probes are utilized to measure temperature and conductivity of the copper-coated iron powder wastewater, Fe < 2 + > concentration is calculated through an empirical formula, and the method has the advantages of no need of reagents, quick response, simple structure, easy integration and the like. The device is suitable for real-time monitoring and automatic dosing control of industrial wastewater.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial wastewater online monitoring, and particularly relates to a method for online detection of ferrous ion content in copper-coated iron powder wastewater. BACKGROUND

[0002] Copper-coated iron powder is a kind of composite powder material widely used in oil-bearing bearing, powder metallurgy, friction material and other fields, which is usually prepared by displacement reaction of iron powder and copper sulfate solution. A large amount of ferrous sulfate waste liquid is produced as a byproduct in the production process, and the ferrous ion concentration is usually 6-8 g / L.

[0003] The current Fe 2+ Concentration detection mainly adopts o-phenanthroline spectrophotometry or potassium dichromate titration method. Although these methods are accurate, they have the following defects: manual sampling is required, real-time monitoring is not possible; chemical reagents are required, and there are problems of complex operation and consumables; data lag, not suitable for continuous automatic control system.

[0004] Therefore, there is an urgent need for a real-time, continuous, reagent-free, easy-to-integrate ferrous ion online detection technology to meet the needs of process monitoring and dosing control of copper-coated iron powder wastewater treatment system. SUMMARY

[0005] The purpose of the present application is to provide a method for online detection of ferrous ion content in copper-coated iron powder wastewater, which solves the problems that the current Fe 2+ Concentration detection requires manual sampling, cannot be monitored in real time, requires chemical reagents, has complex operation and consumable problems, and data lags, which is not suitable for continuous automatic control system.

[0006] To achieve the above purpose, the present application provides a method for online detection of ferrous ion content in copper-coated iron powder wastewater, comprising the following steps: Real-time measurement of wastewater temperature and conductivity by sensor; Input the measurement data into the calculation module and calculate the ferrous ion concentration according to the set formula; Input the ferrous ion concentration value into the monitoring platform for control or alarm of the wastewater treatment process.

[0007] Among them, the sensor real-time measures the wastewater temperature and conductivity, and the specific steps include: The sensor includes a temperature sensor and a conductivity sensor.

[0008] Among them, the sensor real-time measures the wastewater temperature and conductivity, and the specific steps include: The conductivity probe and temperature probe are installed in the copper-coated iron powder wastewater discharge or circulation system to measure the temperature and conductivity in real time.

[0009] The process involves inputting measurement data into the calculation module and calculating the ferrous ion concentration according to a set formula. Specific steps include: The temperature and conductivity data output by the probe are transmitted to the PLC system via signal lines or wireless means; The PLC system embeds a calculation module for real-time calculation of ferrous ion concentration.

[0010] The measurement data is input into the calculation module, and the ferrous ion concentration is calculated according to the set formula. The formula is: C = 0.8377σ + 0.01483T − 2.287; Where C is the ferrous ion concentration (g / L), σ is the conductivity (μS / cm), and T is the wastewater temperature (°C).

[0011] The measurement data is input into the calculation module, and the ferrous ion concentration is calculated according to the set formula. The applicable temperature range is 15~35℃, Fe 2+ The concentration range is 5~9 g / L.

[0012] This invention discloses a method for online detection of ferrous ion content in copper-clad iron powder wastewater. The method utilizes two digital probes to measure the temperature and conductivity of the wastewater and calculates the ferrous ion content using an empirical formula. 2+ Concentration-based methods offer advantages such as reagent-free operation, rapid response, simple structure, and ease of integration, making them suitable for real-time monitoring and automatic dosing control of industrial wastewater. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0014] Figure 1 This is a flowchart illustrating the steps of the online detection method for ferrous ion content in copper-coated iron powder wastewater according to the present invention. Detailed Implementation

[0015] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0016] Please see Figure 1 ,in, Figure 1 This is a flowchart illustrating the steps of the online detection method for ferrous ion content in copper-coated iron powder wastewater according to the present invention.

[0017] This invention provides a method for online detection of ferrous ion content in copper-clad iron powder wastewater, comprising the following steps: S101: Real-time measurement of wastewater temperature and conductivity via sensors; Specifically, two digital sensor probes (conductivity probe and temperature probe) are installed in the copper-clad iron powder wastewater discharge or circulation system to measure the temperature T (unit: °C) and conductivity σ (unit: μS / cm) in real time.

[0018] S102: Input the measurement data into the calculation module and calculate the ferrous ion concentration according to the set formula; Specifically, the temperature and conductivity data output by the probe are transmitted to a computer or PLC system via signal line or wireless means; the system embeds the following empirical model for real-time calculation of ferrous ion concentration C (unit: g / L): C=0.8377σ+0.01483T−2.287.

[0019] S103: Input the ferrous ion concentration value into the monitoring platform for control or alarm in the wastewater treatment process.

[0020] Specifically, the calculated Fe 2+ The concentration is output in real time to the human-machine interface (HMI) or uploaded to the central control system and monitoring platform for alarm, recording or linkage control of the dosing equipment.

[0021] Compared with existing technologies, it has the following significant advantages: No chemical reagents are required, avoiding secondary pollution and operational complexity; It enables continuous online monitoring with a fast response time (down to the second level). The system has a high degree of integration and is suitable for factory automatic control systems; The measurement accuracy is high, with a determination coefficient R² of 0.98306 for the regression model and a concentration error controlled within ±0.2 g / L. It has low operating costs, is easy to maintain, and is suitable for long-term stable industrial operation. Example

[0022] Implementation environment and equipment configuration: Prepare ferrous sulfate standard solutions of different concentrations (5~9g / L) using pure water. The temperature is controlled within the range of 15~35℃ and adjusted by a constant temperature water bath. Conductivity was measured using a high-precision probe, in μS / cm. Temperature is measured using a thermistor with an accuracy of ±0.1℃; Each group of concentrations and temperatures was measured three times, and the average value was taken.

[0023] Experimental data summary: Mathematical model fitting results: The following model was obtained through multiple linear regression analysis: Electrical conductivity and Fe 2+ The relationship between concentration and temperature is as follows: σ = 2.7303 + 1.1938C − 0.0177T The derivation of Fe 2+ The concentration calculation formula is: C = 0.8377σ + 0.01483T − 2.287 The model's coefficient of determination is R. 2 =0.98306, indicating a good fit; The concentration prediction error is controlled within ±0.2 g / L, meeting the requirements for online monitoring of industrial wastewater.

[0024] An online detection method that uses mathematical formulas to calculate the concentration of ferrous ions overcomes the shortcomings of existing technologies, such as slow detection process, high reagent consumption, and lack of automation. Example

[0025] Under actual operating conditions in copper-clad iron powder production, the wastewater temperature was measured to be 27.3℃, and the conductivity was 11.06 μS / cm. The ferrous ion concentration calculation formula proposed according to this invention is as follows: C = 0.8377σ + 0.01483T − 2.287 Substituting the relevant data, the ferrous ion concentration (Fe) in the wastewater was calculated. 2+ The concentration was 7.38 g / L.

[0026] To verify the accuracy of this online detection method, wastewater samples were collected from this site and sent to the laboratory for comparative analysis using the standard potassium dichromate titration method. The laboratory test results showed a ferrous ion concentration of 7.68 g / L.

[0027] Comparative calculations show that the relative error of this method is: Error rate = (7.68 − 7.38) / 7.68 × 100% ≈ 3.9% The results show that the method of the present invention has good detection accuracy and stability in practical industrial applications, and can meet the requirements for Fe detection in copper-clad iron powder wastewater treatment. 2+ The need for real-time monitoring of concentration.

[0028] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A method for online detection of ferrous ion content in copper-coated iron powder wastewater, characterized in that, Includes the following steps: Wastewater temperature and conductivity are measured in real time using sensors; Input the measurement data into the calculation module and calculate the ferrous ion concentration according to the set formula; The ferrous ion concentration value is input into the monitoring platform for control or alarm purposes in the wastewater treatment process.

2. The method for online detection of ferrous ion content in copper-coated iron powder wastewater as described in claim 1, characterized in that, Wastewater temperature and conductivity are measured in real time using sensors. The sensors include temperature sensors and conductivity sensors.

3. The method for online detection of ferrous ion content in copper-coated iron powder wastewater as described in claim 2, characterized in that, The wastewater temperature and conductivity are measured in real time using sensors. The specific steps include: The conductivity probe and temperature probe are installed in the copper-clad iron powder wastewater discharge or circulation system to measure the temperature and conductivity in real time.

4. The method for online detection of ferrous ion content in copper-coated iron powder wastewater as described in claim 3, characterized in that, Input the measurement data into the calculation module and calculate the ferrous ion concentration according to the set formula. The specific steps include: The temperature and conductivity data output by the probe are transmitted to the PLC system via signal lines or wireless means; The PLC system embeds a calculation module for real-time calculation of ferrous ion concentration.

5. The method for online detection of ferrous ion content in copper-clad iron powder wastewater as described in claim 4, characterized in that, Input the measurement data into the calculation module, and calculate the ferrous ion concentration according to the set formula. The formula is: C = 0.8377σ + 0.01483T − 2.287; Where C is the ferrous ion concentration (g / L), σ is the conductivity (μS / cm), and T is the wastewater temperature (°C).

6. The method for online detection of ferrous ion content in copper-clad iron powder wastewater as described in claim 5, characterized in that, Input the measurement data into the calculation module, and calculate the ferrous ion concentration according to the set formula. The applicable temperature range is 15~35℃, Fe 2+ The concentration range is 5~9 g / L.

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