Flume Separator Layout for Clean Mill Scale Recovery
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Solution Overview
Problem
Existing methods for separating mill scale from wastewater in hot rolling mills and basic oxygen furnaces result in oil contamination, leading to increased costs, environmental issues, and reduced recyclability of mill scale.
Innovation Solution
Implementing separators, such as grit separators or continuous deflective separation units, directly in the flumes of hot rolling mills and basic oxygen furnaces to collect mill scale particles from high-speed wastewater, minimizing oil contact and allowing for in-process separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If mill scale is collected from wastewater using conventional separation methods, then mill scale can be retrieved, but the mill scale becomes contaminated with oil
Solution Approach 1:
The separator is installed in the flume to perform preliminary separation of mill scale from wastewater before the mixture reaches oil contamination zones. This preliminary action prevents oil from contacting the mill scale, solving the contradiction by separating the mill scale recovery process from oil-contaminated wastewater regions.
Solution Approach 2:
The separator extracts mill scale particles from the wastewater stream in the flume, removing them before they can be contaminated by oil. This extraction principle allows recovery of clean mill scale while leaving the contaminated wastewater to be treated separately.
2Object-affected harmful factors
If separators are installed in flumes for in-process separation, then oil contamination is reduced, but device complexity increases
Solution Approach 1:
The separator utilizes the existing flume infrastructure and wastewater flow to perform separation without requiring additional energy input or complex control systems. The device leverages natural flow conditions and gravity, making the complexity worthwhile by producing clean mill scale for recycling.
3Productivity
If mill scale is collected with oil contamination, then collection efficiency is high, but recyclability decreases
Solution Approach 1:
By performing separation in the flume before wastewater reaches oil-contaminated areas, the system achieves both high collection efficiency and high recyclability. The preliminary separation ensures mill scale is recovered clean, making it suitable for recycling while maintaining productive collection rates.
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
Achieves cleaner mill scale collection with reduced oil content, lowering treatment and landfill costs, enabling profitable recycling and reducing environmental impact.
Implementation Method 1
Heavy solids settle to the bottom of the sump in the chamber
Implementation Method 2
Heavy solids settle to the bottom of the sump in the chamber
Implementation Method 3
The CDS units deflect the fluid stream inflow into a separation chamber
Implementation Method 4
Floatable solids are kept in motion in the separation chamber so they do not clog the screen
Data Source
AI summary
A method for collecting mill scale from a hot rolling mill is provided. The hot rolling mill includes a flume. The method includes transporting mill scale particles in wastewater, retrieving the wastewater from a flume of the hot rolling mill and separating the mill scale particles from the wastewater using a separator. A hot rolling mill and a method for retrofitting a hot rolling mill are also provided.