Roasting Furnace Rotary Lifting System for Ore Processing
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Solution Overview
Problem
Multiple-hearth roasting furnaces face inefficiencies due to limited processing capacity, mechanical wear, uneven temperature gradients, and the formation of hard crusts that lead to mechanical blockages and frequent halts, requiring energy-intensive restarts and posing environmental risks.
Innovation Solution
A roasting furnace design with a shaft and arms where the distance between stages is increased to at least 1.000 m, equipped with a rotary lifting system allowing teeth to be partially or completely removed from the material bed during rotation, reducing blockages and enabling continuous operation while increasing processing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the distance between consecutive stages is increased to at least 1.000 m, then processing capacity is improved, but the furnace height and structural complexity increase
Solution Approach 1:
The patent applies the dynamics principle by making the arms movable relative to the shaft through a lifting system. The arms can be raised to lift teeth out of the material bed and lowered to position teeth in the material bed. This dynamic adjustment allows the furnace to maintain increased stage distances for higher processing capacity while adapting the arm positions to optimize material handling and reduce the effective operational height requirements.
2Reliability
If a lifting system is added to displace arms during rotation, then mechanical blockages are reduced, but device complexity increases
Solution Approach 1:
The lifting system is designed to be integrated with the existing rotary mechanism of the furnace. The system uses the rotational motion and existing structural elements to provide the lifting function, rather than requiring a completely separate independent lifting mechanism. This self-service approach reduces the overall complexity by utilizing available resources within the furnace system itself.
3Object-generated harmful factors
If teeth are lifted out of the material bed during rotation, then hard crust removal is improved, but mechanical wear and tooth breaking risk increase
Solution Approach 1:
The lifting system operates periodically rather than continuously. Arms are raised to lift teeth out of the material bed at specific intervals during rotation, particularly when crust removal is needed. Between lifting cycles, arms are lowered to allow teeth to engage with fresh material. This periodic action reduces cumulative mechanical stress on teeth compared to continuous lifting, thereby reducing wear and breaking risk while still effectively removing hard crusts.
4Productivity
If the furnace operates continuously without halts, then productivity is improved, but energy consumption for restart increases
Solution Approach 1:
The lifting system enables continuous operation by preventing the formation of hard crusts that would otherwise cause mechanical blockages and forced halts. By periodically lifting teeth out of the material bed during rotation, the system continuously removes potential blockage formers, maintaining uninterrupted material flow through the furnace. This eliminates the need for energy-intensive restart operations while sustaining high productivity throughout the firing cycle.
Data Source
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AI summary
The present invention provides a roasting furnace for processing ores or concentrates, preferably molybdenum-containing ores or concentrates, wherein the roasting furnace contains at least one first rotary lifting system for the displacement of said arm along the axis direction, wherein said first rotary lifting system is a telescopic lifting system, and/or wherein a distance x between two consecutive said stages of said roasting furnace are at least 1,000 m, wherein said distance x is measured along the axis direction. The object of the invention is to provide a roasting furnace of said type with improved processing capacity and/or a reduction in the number of halts, and consequently to be more energy-efficient, more environmentally-friendly and more economically interesting.