Pickling Acid Fe2+/Fe3+ Concentration Detection Using EC, ORP, and Density
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Solution Overview
Problem
Existing methods fail to accurately determine the concentrations of Fe2+ and Fe3+ ions in acidic solutions during acid pickling, which affects the efficiency of the process.
Innovation Solution
A method and device for detecting Fe2+ and Fe3+ ion concentrations using relational expressions based on electrical conductivity, specific gravity, and oxidation-reduction potential, allowing for online detection and adjustment of acid pickling conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only oxidation-reduction potential is measured to control Fe ion concentrations, then the control system is simple, but the measurement precision of individual Fe2+ and Fe3+ concentrations is insufficient
Solution Approach 1:
The patent segments the measurement of Fe ion concentrations by distinguishing between Fe2+ and Fe3+ ions, measuring their concentrations separately rather than as a total. This segmentation enables precise control of each ion's concentration independently, resolving the contradiction by achieving higher measurement precision for individual ions while using a systematic approach that manages complexity through structured measurement of multiple parameters (oxidation-reduction potential, electrical conductivity, specific gravity) in combination.
Solution Approach 2:
The patent changes the measurement parameters from solely oxidation-reduction potential to a combination of oxidation-reduction potential, electrical conductivity, and specific gravity. By introducing additional parameters, the system achieves higher precision in determining individual Fe2+ and Fe3+ concentrations. The complexity is managed by using these parameters in a coordinated measurement system that leverages their interrelationships.
2Productivity
If acid pickling is continued without adjustment, then the process runs continuously, but the acid pickling efficiency decreases over time
Solution Approach 1:
The patent implements a feedback control system that continuously monitors oxidation-reduction potential, electrical conductivity, and specific gravity, then uses this information to determine and adjust Fe ion concentrations. This feedback mechanism enables the system to maintain optimal acid pickling efficiency by detecting changes in real-time and making appropriate adjustments, thereby extending the effective service life of the acid solution while sustaining high productivity.
Solution Approach 2:
The system enables the acid pickling process to self-regulate by automatically detecting changes in solution composition and adjusting Fe ion concentrations based on measured parameters. This self-service capability allows the process to maintain optimal performance without external intervention, extending the acid solution's effective duration while preserving high pickling efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables quick and accurate detection of Fe2+ and Fe3+ ion concentrations, enabling effective maintenance of acid pickling performance through automated addition of additives.
Implementation Method 1
an electrical conductivity meter, and a specific gravity meter about an acidic solution AS
Implementation Method 2
an electrical conductivity meter, and a specific gravity meter about an acidic solution AS
Implementation Method 3
the oxidation-reduction potential ORP of the acidic solution that are measured during the acid pickling
Data Source
AI summary
A method for detecting concentrations of a Fe2+ ion and/or a Fe3+ ion contained in an acid solution used for pickling of a rolled material, whereina Fe2+ ion concentration and/or a Fe3+ ion concentration are determined based onrelationship (1) of the Fe2+ ion concentration as a function of an electrical conductivity EC, a specific gravity d, and a hydrochloric acid concentration, of the acid solution,relationship (2) of the Fe3+ ion concentration as a function of the electrical conductivity EC, the specific gravity d, and the hydrochloric acid concentration, of the acid solution,relationship (3) of oxidation-reduction potential ORP as a function of the Fe2+ ion concentration, the Fe3+ ion concentration, and the hydrochloric acid concentration, of the acid solution, andthe electrical conductivity EC, the specific gravity d, and the oxidation-reduction potential ORP, of the acid solution, measured during pickling.