Shell-Mold Sand Regeneration Using Magnetic and Pneumatic Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional treatment systems for waste shell-mold sand are ineffective in separating magnetic and non-magnetic impurity particles, and the shell-mold sand fragments are reduced to excessively small particle sizes, rendering them unsuitable for reuse.
Innovation Solution
A multi-step process involving smashing, sieving, magnetic separation, grinding, and dry pneumatic flotation to separate and purify shell-mold sand, maintaining suitable particle sizes and removing impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the conventional stripping unit uses rotary vanes to strike waste shell-mold fragments, then the silica binders are peeled off the surface, but the fragments are smashed into powders with too small particle size
Solution Approach 1:
The patent replaces the mechanical striking action of rotary vanes with a magnetic field-based separation system. Magnetic particles are removed through magnetic attraction, and non-magnetic particles are separated through pneumatic flotation, eliminating the need for mechanical striking that reduces particles to powder size.
Solution Approach 2:
The patent introduces a pneumatic flotation system where air flow is used to separate non-magnetic impurity particles from the shell-mold sand. The air flow carries away lighter non-magnetic particles while leaving the heavier shell-mold sand behind, achieving separation without mechanical striking.
2Reliability
If the conventional treatment system uses only mechanical smashing and stripping, then the process is simple, but it cannot separate magnetic and non-magnetic impurity particles effectively
Solution Approach 1:
The patent replaces purely mechanical separation with magnetic field-based separation for removing magnetic particles. This allows effective separation of magnetic and non-magnetic particles without adding complex mechanical sorting mechanisms.
Solution Approach 2:
The patent adds a pneumatic flotation system that uses air flow to separate non-magnetic impurity particles from the shell-mold sand. This pneumatic approach provides an additional separation mechanism that works complementarily with magnetic separation, achieving comprehensive impurity removal.
3Manufacturing precision
If the waste shell-mold sand is reduced to fine powders, then the stripping is more effective, but the regenerated sand cannot substitute original shell-mold sand due to excessive small particle size
Solution Approach 1:
The patent uses magnetic and pneumatic separation systems instead of mechanical striking to remove impurities. This approach maintains the original particle size of the shell-mold sand while effectively removing magnetic and non-magnetic impurities, making the regenerated sand suitable for reuse.
Solution Approach 2:
The patent changes the separation parameters from mechanical force to magnetic field strength and air flow velocity. This allows impurity removal without applying excessive mechanical force that would reduce particles to powder size, maintaining suitable particle size for reuse.
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 process effectively recovers shell-mold sand suitable for reuse by removing impurities and maintaining particle size, enhancing recovery rates and improving the quality of regenerated shell-mold sand.
Implementation Method 1
a magnetic separator for removing magnetic metal particles from the refined shell-mold sand
Implementation Method 2
a pneumatic flotation machine for separating non-magnetic impurity particles from the shell-mold sand granular material
Data Source
AI summary
A regeneration treatment method of waste shell-mold and a system thereof are provided. The regeneration treatment method has a raw smashing step, a smashed-particle sieving step smashed-particle, a first magnetic separation step, a grinding step, a second magnetic separation step, a dry pneumatic flotation step, and a vibration sieving step in sequence to obtain a regenerated shell-mold sand. The refined shell-mold sand is obtained from the smashed-particle sieving step. Silica binders of the refined shell-mold sand is effectively removed by the grinding step. Furthermore, particle sizes of the regenerated shell-mold sand fall in a suitable range in the grinding step. Magnetic metals mixed in the waste shell-mold are effectively removed by the first and second magnetic separation steps. Non-magnetic impurity are further removed by the dry pneumatic flotation step. Therefore, the regenerated shell-mold sand are suitable to substitute original shell-mold sand.