Mesh Conveyor Air Cleaning for Crushed Polycrystalline Silicon
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Solution Overview
Problem
Existing methods for producing cleaned crushed polycrystalline silicon blocks are inefficient in removing fine powders, leading to metal contamination and reduced productivity during the Czochralski method, as conventional classifiers fail to effectively remove small, highly contaminated silicon fine powders and metal fine powders generated during crushing.
Innovation Solution
A device equipped with gas blowers above and below a mesh-form conveying belt, along with a scattering prevention mesh, is used to efficiently blow away fine powders from crushed polycrystalline silicon blocks, ensuring thorough cleaning and preventing excessive scattering, which enhances the removal efficiency of fine powders attached to the surface and lower surfaces of the blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional classifiers (vibration sieving, rotating cylinder, roller classifier) are used to separate crushed polycrystalline silicon blocks, then classification by size is achieved, but fine powders (metal and silicon) generated during crushing cannot be effectively removed
Solution Approach 1:
The patent uses a gas blower to blow compressed air through a mesh conveyor belt to remove fine powders from crushed polycrystalline silicon blocks. The gas flow lifts and transports the fine powders away from the crushed product, effectively separating them without requiring additional mechanical classification equipment.
Solution Approach 2:
The patent employs a mesh conveyor belt with specific mesh sizes that allows compressed air to pass through while supporting the crushed polycrystalline silicon blocks. The mesh structure enables the gas flow to reach the blocks from below and carry away fine powders through the mesh openings.
2Object-affected harmful factors
If compressed air is applied to remove fine powders from crushed products, then removal efficiency improves, but crushed blocks may scatter excessively and fall off the conveyor
Solution Approach 1:
The mesh conveyor belt provides a stable support structure that holds crushed blocks in place while allowing gas flow through. The mesh openings are sized to prevent blocks from falling through while permitting fine powders to be carried away by the gas stream.
Solution Approach 2:
The gas blower is positioned to blow air through specific regions of the mesh conveyor belt where fine powder removal is needed, rather than applying uniform force across the entire conveyor. This localized approach removes contaminants while minimizing disturbance to the crushed blocks.
3Productivity
If manual crushing or jaw crusher is used to crush polycrystalline silicon blocks, then crushing efficiency is achieved, but metal fine powders from crusher materials contaminate the crushed product
Solution Approach 1:
The gas blower system efficiently removes metal fine powders generated during crushing by blowing compressed air through the mesh conveyor belt. This pneumatic separation method effectively separates the lighter metal powders from the heavier crushed silicon blocks without requiring additional cleaning steps.
Solution Approach 2:
The patent extracts and removes the harmful fine powder contaminants (both metal and silicon) from the crushed polycrystalline silicon blocks using the gas blower system. The fine powders are separated and removed from the product stream, leaving cleaned crushed blocks for further processing.
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
The device effectively reduces the mixing of fine powders and metal impurities, improving the cleanliness of crushed polycrystalline silicon blocks, thereby enhancing the productivity of silicon ingots by ensuring efficient removal of fine powders, particularly those adhered to the lower surfaces, and preventing the blocks from falling off the conveyor.
Implementation Method 1
blowing a gas to the crushed polycrystalline silicon blocks mounted on the conveying belt
Implementation Method 2
scattering prevention mesh for the crushed polycrystalline silicon blocks between the travel surface of the conveying belt and the gas blower
Data Source
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AI summary
[Problem] To provide a production device whereby, after crushing polycrystalline silicon blocks, contaminating fine powders, such as a fine metal powder and fine silicon powder, can be efficiently removed by blowing a gas stream thereto. [Solution] A device for producing a cleaned crushed product of polycrystalline silicon blocks, said device being provided with: a) a conveying belt conveyer for a crushed product of polycrystalline silicon blocks, said conveying belt preferably being mesh-like; b) a gas stream-injector for blowing away fine powders mixed in the crushed product of polycrystalline silicon blocks, said injector being placed above a travel surface of the conveying belt of the conveying belt conveyer; and c) a mesh for preventing scattering of the crushed product of polycrystalline silicon blocks, said mesh being placed between the travel surface of the mesh-like conveying belt and the gas stream-injector for blowing away fine powders that is provided above the travel surface.