Manganese Sulfate Processing With Conductivity-Guided Persulfate Dosing
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Solution Overview
Problem
Existing manganese precipitation processes in hydrometallurgy face challenges in accurately measuring manganese content online and optimizing reaction times due to varying manganese concentrations in raw materials, leading to potential over- or under-dosing of persulfate and inefficiencies in manganese recovery.
Innovation Solution
A method involving leaching with sulfuric acid and hydrogen peroxide to produce a manganese sulfate solution, measuring conductivity to determine manganese concentration, and dosing persulfate accordingly to precipitate manganese oxide, with online conductivity monitoring and filtering to ensure high precipitation efficiency, using a low-cost conductivity measuring device and computing unit to optimize reagent use and reaction times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional titration methods are used to measure manganese content, then measurement accuracy can be achieved, but the process requires offline sampling and has long lead time
Solution Approach 1:
The patent replaces conventional mechanical/chemical titration methods with online conductivity measurement and automated computing unit analysis. The conductivity sensor continuously monitors the process solution, and the computing unit automatically calculates manganese content based on calibrated relationships, eliminating manual sampling and titration operations while providing real-time data.
Solution Approach 2:
The patent introduces conductivity as an intermediary parameter to indirectly measure manganese content. Instead of directly measuring manganese through time-consuming titration, the system measures conductivity which correlates with manganese concentration, providing rapid results that are then used to control persulfate dosing.
2Ease of operation
If persulfate dosing is based on fixed recipes, then process simplicity is maintained, but over- or under-dosing occurs when manganese content varies
Solution Approach 1:
The patent implements a closed-loop feedback system where online conductivity measurements continuously monitor manganese content in the process solution. The computing unit uses this real-time data to automatically adjust persulfate dosing rates, ensuring accurate stoichiometric dosing even when manganese content varies. This maintains process simplicity while achieving precise dosing through automated control.
Solution Approach 2:
The patent transitions from static fixed-recipe dosing to dynamic adaptive dosing. The persulfate dosing rate is continuously adjusted based on real-time manganese content measurements from the conductivity sensor and computing unit, allowing the system to adapt to varying feed material composition while maintaining operational simplicity.
3Reliability
If reaction time is extended to ensure complete precipitation, then manganese recovery is maximized, but productivity decreases
Solution Approach 1:
The patent uses online conductivity monitoring with feedback control to determine the optimal endpoint of the precipitation reaction. The computing unit continuously analyzes conductivity data and identifies when manganese precipitation is complete based on established thresholds, allowing the process to stop at the precise moment of completion rather than using fixed extended reaction times, thus maximizing both recovery and productivity.
Solution Approach 2:
The system enables self-regulating precipitation by using the conductivity sensor to automatically detect when the reaction is complete. The process solution itself provides the measurement signal (conductivity change) that triggers the endpoint detection, eliminating the need for external monitoring or extended reaction times to ensure completeness.
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 accurate, real-time measurement and optimization of manganese precipitation, ensuring at least 90% manganese is precipitated, reducing operational expenditures, and minimizing the risk of off-specification products through efficient reagent use and low-cost equipment.
Implementation Method 1
a) leaching the manganese containing material using sulfuric acid and hydrogen peroxide to produce a first process solution comprising manganese sulfate
Implementation Method 2
b) measuring conductivity of the first process solution at a temperature, c) determining concentration of manganese based on the measured conductivity
Implementation Method 3
d) dosing persulfate according to the determined manganese concentration to produce a second process solution, and to precipitate at least part of manganese oxide
Implementation Method 4
e) filtering the manganese oxide, to produce a manganese depleted process liquor
Data Source
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AI summary
According to an example aspect of the present invention, there is provided a method for processing a manganese containing material comprising: a) leaching the manganese containing material using sulfuric acid and hydrogen peroxide to produce a first process solution comprising manganese sulfate, which first process solution is filtrated, b) measuring conductivity of the first process solution at a temperature, c) determining concentration of manganese based on the measured conductivity of the first process solution at the temperature, and a correlation between the conductivity and the concentration, d) dosing persulfate according to the determined manganese concentration to produce a second process solution, and to precipitate at least part of manganese oxide, and e) filtering the manganese oxide, to produce a manganese depleted process liquor.