Laterite Nickel Slag Filtration and Refining for Acid Leaching
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Solution Overview
Problem
The recovery and utilization efficiency of the slag phase generated during the removal of iron, aluminum, and chromium from laterite nickel ore is hindered by the presence of larger particles, which impede subsequent reactions with acidic pulp.
Innovation Solution
A treatment system comprising a filtering module for solid-liquid separation, a refining module for crushing and grinding filter residue, and a feeding module for controlled introduction into a neutralization unit, along with a measurement module to regulate pH, ensuring timely extraction, filtration, and controlled feeding of the slag phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the slag phase is directly returned to the neutralization unit without treatment, then the process is simple, but the larger particles in the slag phase hinder reaction with acidic pulp and reduce recovery efficiency
Solution Approach 1:
The treatment system divides the slag phase processing into distinct functional modules: a filtering module for solid-liquid separation, a refining module for particle size reduction, and a feeding module for controlled return. This segmentation allows each module to perform its specific function optimally, transforming the undifferentiated slag phase into fine, reactive particles that efficiently participate in acid leaching reactions.
Solution Approach 2:
The system performs preliminary treatment of the slag phase before it is returned to the neutralization unit. By pre-filtering and pre-crushing the slag phase, the system ensures that particles are properly prepared and sized before entering the main processing circuit, thereby maximizing their reactivity and recovery efficiency without disrupting the overall process flow.
2Reliability
If the slag phase is filtered and refined to improve particle size, then reaction efficiency with acidic pulp improves, but the equipment complexity and operational complexity increase
Solution Approach 1:
The filtering and refining operations are merged into a integrated treatment system where the filtering module and refining module work in sequence. This combination ensures that slag phase particles are both separated from liquid and reduced to appropriate sizes, achieving reliable reaction efficiency while managing operational complexity through systematic integration of necessary processing steps.
3Productivity
If the slag phase is crushed to reduce particle size, then the acid leaching efficiency improves, but the energy consumption and equipment complexity increase
Solution Approach 1:
The system changes the physical parameters of the slag phase, specifically reducing particle size through crushing in the refining module. This parameter change increases the surface area to volume ratio of the slag particles, thereby improving acid leaching efficiency. The energy consumption is managed by optimizing the crushing operation to achieve the necessary particle size reduction without excessive energy input.
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
Enhances the efficiency of slag phase recycling by ensuring thorough reaction with acidic ore pulp and precise quantity control, leading to improved acid leaching and dissolution efficiency.
Implementation Method 1
a suction pump, and an outlet of the suction pump is connected to an interior of the inner cylinder through a second connecting pipe
Implementation Method 2
the filtering assembly is used to filter the slag phase; the filtering assembly has a filter residue outlet and a filtrate outlet
Implementation Method 3
a refining module, which is connected to the filter residue outlet and is used for crushing the filter residue
Implementation Method 4
a first spiral conveyor rod extending from the bottom to the top of the inner cylinder; the first motor is used to drive the first spiral conveyor rod to rotate inside the inner cylinder
Data Source
AI summary
Disclosed is a treatment system for the slag phase after removing iron-aluminum-chromium from leaching solution of laterite nickel ore, comprising a filtering module, a refining module, a feeding module, and a measurement module. The filtering module comprises a material suction component and a filtering assembly. The filtering assembly is connected to the outlet of the material suction component and features a filter residue outlet and a filtrate outlet. The refining module is connected to the filter residue outlet. The feeding module consists of a material pipe and a material guiding drive component. The material pipe has an inlet end connected to the outlet of the refining module. This setup enables the timely filtration of the generated slag phase, followed by refinement processing, and allows for the controlled metering of the returned filter residue. Consequently, it enhances the subsequent acid leaching and dissolution efficiency of the slag phase.