Sensor-Based Sorting of Kerogen-Rich Limestone Tailings
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Solution Overview
Problem
The accumulation of kerogen-containing oil shale mine tailings from mining in Estonia poses a challenge as they have not been industrially beneficiated, leading to land occupation and underutilization of a valuable resource with high organic matter content.
Innovation Solution
A method involving comminution, classification, and sensor-based sorting of kerogen-containing limestone rock material into higher and lower kerogen content particles using X-ray absorption rates, enabling the separation and enrichment of kerogen and calcium carbonate for various industrial applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If oil shale mining is conducted to extract kerogen, then organic matter content is obtained, but large amounts of kerogen-containing tailings accumulate and occupy land
Solution Approach 1:
The invention extracts and separates kerogen-containing rock particles from the tailings material using sensor-based sorting technology. X-ray sensors detect the kerogen content in each particle, and sorted particles are selectively removed and collected as a separate stream, effectively extracting the valuable organic matter while leaving the cleaned material for other uses
Solution Approach 2:
The invention recovers kerogen from what would otherwise be discarded tailings material. By implementing sensor-based sorting, the system identifies and recovers kerogen-containing particles that would have been wasted, transforming a waste disposal problem into a resource recovery opportunity
2Manufacturing precision
If sensor-based sorting is implemented to separate kerogen-containing particles, then kerogen enrichment is achieved, but device complexity increases
Solution Approach 1:
The invention replaces complex mechanical sorting systems with sensor-based detection and automated sorting. X-ray sensors non-contactlessly detect kerogen content in particles, and electronically controlled sorting mechanisms separate particles based on detected properties, reducing mechanical complexity while improving sorting precision
Solution Approach 2:
The invention introduces X-ray radiation as an intermediary to detect kerogen content in particles. The sensors use X-ray absorption differences to indirectly measure organic matter content without direct contact, enabling precise separation while keeping the physical sorting mechanism relatively simple
3Productivity
If traditional oil shale processing is used, then energy production is achieved, but valuable kerogen in tailings remains underutilized
Solution Approach 1:
The invention recovers kerogen from tailings that would otherwise be discarded after energy production. The sensor-based sorting system identifies kerogen-containing particles in the waste stream and separates them for potential reuse in chemical products, cement industry applications, or further energy extraction
Solution Approach 2:
The invention enables the tailings material to serve multiple functions: cleaned tailings can be used in construction applications while separated kerogen-containing particles can be processed for chemical products, cement raw materials, or additional energy production, maximizing the utility of the original mining output
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 converts oil shale mine tailings into recycled raw materials and kerogen concentrate, facilitating their use in the chemical and cement industries, contributing to the circular economy and reducing land occupation by tailings heaps.
Implementation Method 1
the sensor-based sorting device comprises an X-ray source, from which X-ray radiation is emitted through the rock particles, and intensity of X-ray radiation passing through the rock particles is detected by the at least one sensor
Data Source
Figure 1
AI summary
The invention describes a method and arrangement for processing kerogen-containing limestone rock material obtained from oil shale mining. The rock material is comminuted into rock particles (10) and the rock particles (10) are classified to a particle size in a range of 5 to 300 mm. The rock particles (10) are sorted into first rock particles (11) having higher kerogen content and second rock particles (12) having lower kerogen content using a sensor-based sorting device (4).