Inline measurement of ash and total solids in flotation of coal slurries obtained from coal washing during the extraction process.
This article explores the use of the Polispec NIR system for measuring ash and total solids content in coal wash liquor during the flotation process.
In coal extraction, fine coal dust that would otherwise be lost during washing can be recovered through flotation. The Polispec NIR system continuously measures ash and total solids concentration, enabling optimal adjustment of the flotation process and the use of necessary frothing agents.
Continuous monitoring of the flotation with Polispec NIR to maximize residual coal recover.
During coal extraction, a significant amount of fine dust is generated and can be lost in the washing process. To reclaim this material, a flotation process is used, where specific frothing agents help separate fine coal particles from the wash liquor.
Accurate measurement of ash and total solids in the flotation liquor is crucial for optimizing the process and ensuring efficient recovery of residual coal particles.
Practical objectives
- Measure the ash and total solids concentration in flotation liquor in real time.
- Optimize flotation process parameters and the usage of frothing agents.
- Improve the recovery rate of fine coal particles.
Methodology
The Polispec NIR system was installed inline within the flotation process. Using near-infrared spectroscopy, the system continuously analyzes the coal wash liquor to determine ash and total solids concentration.
Initiating the coal washing process
The coal washing process begins, separating larger and heavier particles from fine dust and impurities.
Starting the flotation process
The wash liquor enters the flotation process to recover residual dispersed coal particles.
Inline measurement with Polispec NIR
The flotation liquor is measured with the Polispec NIR system to determine ash and total solids concentration.
Process adjustment
Based on these measurements, operators adjust the amount of frothing agents used to optimize flotation efficiency.
Implementing the Polispec NIR system has enabled:
- Continuous, real-time monitoring of ash and total solids concentration, providing immediate feedback for process adjustments.
- Improved flotation efficiency, leading to higher recovery rates of fine coal particles.
- Reduced waste and better resource management by optimizing frothing agent usage.
The system has facilitated more precise control over the flotation process, contributing to increased overall productivity and reduced operational costs.
The Polispec NIR system has proven effective in measuring ash and total solids in coal wash liquor during flotation processes.
By providing real-time data, it enables optimal adjustments in plant settings and the use of necessary frothing agents, improving recovery rates and enhancing the efficiency of coal extraction operations.
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