Laterite Nickel Leaching Acid-to-Ore Ratio With Dynamic Acid Flow Control
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Solution Overview
Problem
The determination of the optimal acid-to-ore ratio in high-pressure leaching of laterite nickel ore is challenging due to differences between pilot apparatus and large autoclave processes, leading to inefficient production and increased costs, as current methods rely on fixed ratios or manual adjustments.
Innovation Solution
A dynamic optimization method that adjusts the sulfuric acid flow rate based on real-time feed ore composition, pulp concentration, and leaching conditions to maintain an optimal acid-to-ore ratio, using mathematical models to calculate and control the hydrogen ion concentration and sulfate concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed acid-to-ore ratio is used in high-pressure leaching, then the operation is simple, but the production efficiency decreases and costs increase due to suboptimal acid dosage
Solution Approach 1:
The patent implements a dynamic optimization system that continuously adjusts the acid-to-ore ratio based on real-time process parameters (temperature, pressure, ore composition, pulp concentration). This transforms the static fixed ratio approach into a dynamic adaptive system, allowing the leaching process to maintain optimal efficiency while responding to changing operating conditions
Solution Approach 2:
The system incorporates feedback mechanisms by monitoring process parameters and using this information to adjust acid dosage. The optimization model uses real-time data on temperature, pressure, ore composition, and pulp concentration to continuously refine the acid-to-ore ratio, creating a closed-loop control system that improves both efficiency and operational simplicity
2Extent of automation
If manual judgment is used to adjust acid-to-ore ratio, then automation level is low, but the optimization accuracy is insufficient leading to cost increases
Solution Approach 1:
The patent replaces manual judgment and mechanical adjustment systems with an automated computational optimization model. This model uses mathematical algorithms to calculate the optimal acid-to-ore ratio based on process parameters, eliminating human subjectivity and improving optimization accuracy while significantly increasing the automation level of the leaching process
Solution Approach 2:
The system dynamically changes the acid-to-ore ratio parameter based on optimized calculations rather than fixed manual settings. By continuously adjusting this critical parameter according to real-time process conditions and optimization models, the system achieves higher precision in acid dosage control, reducing both acid waste and neutralizer requirements
3Productivity
If excessive acid-to-ore ratio is used, then the leaching rate of metal ions is high, but the neutralizer consumption increases and costs increase
Solution Approach 1:
The optimization model dynamically adjusts the acid-to-ore ratio parameter to achieve the minimum dosage required for effective leaching. By precisely controlling this parameter based on ore composition, pulp concentration, temperature, and pressure, the system maintains high leaching rates while minimizing excess acid that would require neutralization, thereby reducing both acid waste and neutralizer consumption
Solution Approach 2:
The system enables self-optimization of acid dosage by using real-time process data to automatically determine the optimal acid-to-ore ratio. This self-adjusting mechanism ensures that acid is dosed at the precise amount needed for efficient leaching without excess, allowing the process to self-regulate and minimize waste without external intervention
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
This method ensures the high-pressure acid leaching process operates at an optimal acid-to-ore ratio, enhancing production efficiency and reducing costs by dynamically adjusting sulfuric acid addition, providing fast and accurate optimization.
Implementation Method 1
acid leaching the preheated pulp in a high-pressure autoclave
Data Source
AI summary
A dynamic optimization method for acid-to-ore ratio in high-pressure leaching of laterite nickel ore includes: obtaining a feed ore composition, a pulp concentration, a pulp flow rate, a leaching temperature and a pulp duration time in an autoclave, and setting a target leaching rate of nickel; setting a flow rate of sulfuric acid; obtaining a relationship between a hydrogen ion concentration in a solution and a reaction time; obtaining a theoretical leaching rate of nickel when a leaching time reaches the pulp duration time in the autoclave; comparing the theoretical leaching rate of nickel with the target leaching rate of nickel; adjusting the set flow rate of the sulfuric acid until the theoretical leaching rate of nickel is equal to the target leaching rate of nickel, calculating a corresponding optimal acid-to-ore ratio; and adjusting an opening degree of a sulfuric acid flow regulating valve of the autoclave.