High-Pressure Laterite Nickel Leaching Duration Feedback Control
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Solution Overview
Problem
The optimization of duration time in high-pressure leaching of laterite nickel ore is complex and dynamically affected by factors like leaching temperature, feed ore component, and operating conditions, with existing methods failing to accurately determine optimal duration times in large-scale autoclaves due to differences between small test apparatuses and large-scale operations.
Innovation Solution
A system comprising a data collecting module, actual duration time calculating module, optimal duration time determining module, and duration time control module, which collects and calculates real-time operational data to determine and adjust the duration time of high-pressure leaching, ensuring optimal conditions through feedback control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the acid leaching time is extended to ensure complete leaching and high metal recovery rate, then the leaching completeness and metal leaching rate are improved, but the production efficiency and pulp processing per unit time decrease
Solution Approach 1:
The patent implements dynamic adjustment of leaching time based on real-time monitoring of leaching temperature, feed ore composition, feed amount, and operating conditions of preheating-flash system. The optimization system continuously calculates and adjusts the optimal leaching time to match changing process conditions, transitioning from static fixed-time leaching to dynamic adaptive leaching that responds to actual process state.
Solution Approach 2:
The patent establishes a feedback control system that monitors key process parameters (leaching temperature, ore composition, steam consumption, acid consumption) and uses this information to continuously optimize leaching time. The system compares actual process state with target state and adjusts leaching duration accordingly, creating a closed-loop control mechanism that balances leaching completeness with production efficiency.
2Productivity
If the acid leaching time is reduced to increase production efficiency and pulp processing per unit time, then the production efficiency and output per unit time are improved, but the metal leaching rate and ore utilization rate decrease
Solution Approach 1:
The system dynamically determines leaching time based on real-time process conditions rather than using fixed conservative time values. By continuously adjusting leaching duration to match actual process state, the system achieves sufficient leaching completion in shorter times under optimal conditions, thereby increasing production efficiency without sacrificing metal recovery rate.
Solution Approach 2:
The patent changes the leaching time parameter dynamically based on multiple process parameters including temperature, ore composition, and feed rate. The optimization system calculates the optimal leaching time by considering the interrelationships between these parameters, allowing the system to operate at minimum effective leaching times that maintain high metal recovery while maximizing production efficiency.
3Temperature
If a large quantity of steam is used to preheat the pulp to ensure adequate heating, then the heating effectiveness is improved, but the steam consumption and operating costs increase
Solution Approach 1:
The patent implements feedback control for the preheating process by monitoring pulp temperature, steam consumption, and flash tank performance. The system adjusts steam injection rates based on actual heating effectiveness and process conditions, reducing steam consumption while maintaining adequate pulp temperature for efficient leaching. The feedback mechanism allows real-time optimization of the energy-intensive preheating stage.
Solution Approach 2:
The system dynamically adjusts preheating parameters including steam flow rate, preheating temperature, and residence time based on real-time process conditions. By optimizing these parameters rather than using fixed conservative values, the system achieves effective pulp heating with reduced steam consumption, directly addressing the contradiction between heating effectiveness and energy loss.
4Reliability
If the leaching time is extended to accommodate variations in feed ore composition and operating conditions, then the leaching completeness is maintained, but the system responsiveness to production fluctuations decreases
Solution Approach 1:
The patent transforms the static leaching time setting into a dynamic parameter that automatically adapts to changing process conditions. The optimization system continuously monitors feed ore composition, temperature, and other variables, and adjusts leaching time in real-time to maintain leaching completeness while responding quickly to production fluctuations. This dynamic approach eliminates the need for conservative fixed-time settings.
Solution Approach 2:
The system performs self-optimization by automatically adjusting leaching time based on its own monitored process data without external intervention. The optimization algorithm uses real-time process information to determine the appropriate leaching duration, enabling the system to adapt to variations in feed composition and operating conditions while maintaining leaching effectiveness and responding rapidly to production changes.
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 precise and rapid adjustment of duration time based on production fluctuations, maintaining the high-pressure leaching process in a dynamic optimal state, improving efficiency and profitability.
Implementation Method 1
a large quantity of steam is required to preheat the pulp to a specified temperature
Implementation Method 2
the leaching solution leached at a high temperature and a high pressure needs to be gradually lowered to a low temperature and a normal pressure by using a flash tank. In this process, a large quantity of flash steam is generated
Data Source
AI summary
A system for optimizing duration time of high-pressure leaching of laterite nickel ore, includes a data collecting module, an actual duration time calculating module configured to obtain an actual duration time of the pulp in the autoclave during the high-pressure leaching process, an optimal duration time determining module configured to obtain an optimal duration time corresponding to a maximum income value, according to the qualities of the pulp, and a duration time control module configured to compare an actual duration time with the optimal duration time under this condition, and control opening degrees of a feed valve and a discharge valve of the autoclave by using a feedback control system, to ensure the actual duration time of the pulp in the autoclave is within the optimal duration time all the time.