Sand Washing Hydrocyclone Wear Reduction via Segmentation
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Solution Overview
Problem
The existing methods for washing and grading sand for concrete production in the US market, which require a coarser specification than in Europe, cause increased wear and maintenance costs due to larger particle sizes, particularly in hydrocyclones used for classification and removal of silt.
Innovation Solution
A method and apparatus that separates sand into fine and coarse fractions using a grading screen and hydrocyclones, followed by dewatering screens, allowing for the efficient removal of fine contaminants and adjustment of sand specifications to produce C33 grade coarse sand, with a water treatment system for recycling and reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If hydrocyclones are used to classify and remove silt from sand with larger particle sizes (C33 specification), then the sand specification requirement is met, but wear on hydrocyclone components increases and maintenance costs increase
Solution Approach 1:
The sand washing process is divided into two separate hydrocyclone stages: a first hydrocyclone that handles the bulk of silt removal from coarser sand fractions, and a second hydrocyclone that processes finer fractions. This segmentation allows each hydrocyclone to be optimized for its specific size range, reducing overall wear while maintaining C33 specification requirements.
Solution Approach 2:
The patent employs different aperture sizes in the screens and different classification parameters in the two hydrocyclone stages to optimize particle separation. By changing the physical parameters (aperture sizes, hydrocyclone dimensions) to match the specific size ranges of sand fractions, the system achieves precise C33 specification grading while minimizing excessive wear on components.
2Device complexity
If a single-stage washing and grading system is used, then device complexity is reduced, but the ability to precisely adjust sand specifications and remove fine contaminants is insufficient
Solution Approach 1:
The washing system is segmented into multiple functional stages: screening stages with different aperture sizes, a first hydrocyclone for coarse fraction processing, and a second hydrocyclone for fine fraction processing. This segmentation enables precise control over sand specifications by treating different size fractions through appropriately designed stages.
Solution Approach 2:
The multi-stage system performs multiple functions within an integrated apparatus: initial screening, dewatering, coarse fraction hydrocyclone classification, fine fraction hydrocyclone classification, and product separation. Each component serves multiple purposes in the overall sand washing and specification adjustment process.
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 approach reduces wear on hydrocyclone components, decreases downtime and maintenance costs, and allows for precise adjustment of sand specifications, increasing the production of valuable coarse sand products while recycling water for reuse.
Implementation Method 1
separating a feed material into a fine fraction and a coarse fraction
Implementation Method 2
A hydrocyclone is a device used to separate particles in a liquid suspension based on the ratio of their centripetal force to fluid resistance
Implementation Method 3
passing the fine fraction entrained in water to a first fines separation stage, comprising one or more hydrocyclones, to thereby remove fine contaminants therefrom
Implementation Method 4
passing the fine fraction, carried in the under flow from the one or more hydrocyclones, to a first dewatering screen to be dewatered thereon
Implementation Method 5
a first dewatering screen to be dewatered thereon and collected as a fine sand product
Data Source
AI summary
A method and apparatus for washing and grading sand includes a first grading screen adapted to separate a feed material into a fine fraction and a coarse fraction, the coarse fraction having a greater particle size than the fine fraction. A first fines separation stage including one or more hydrocyclones is adapted to receive the fine fraction entrained in water, downstream of the first grading screen to thereby remove fine contaminants. A first dewatering screen includes a deck adapted to dewater the fine fraction downstream of the first fines separation stage to provide a fine sand product, and a second dewatering screen includes a deck adapted to dewater the coarse fraction downstream of the first grading screen to provide a coarse sand product.