Indirect Cooling of Black Slag in Steel Production
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Solution Overview
Problem
Current methods for treating black slag generated in steel production are lengthy, require extensive handling and storage spaces, involve high costs, and necessitate complex leachate treatment, while maintaining high quality and safety standards.
Innovation Solution
A method and apparatus for indirectly cooling black slag immediately after its generation using a rotating tubular reactor with indirect heat exchange, reducing handling and storage needs, and achieving rapid cooling to stabilize mineral structures without free lime formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If black slag is cooled by direct water contact in a collection area, then cooling efficiency is improved, but leachate pollution is generated requiring complex treatment plants
Solution Approach 1:
The patent introduces an intermediary cooling medium (air or water) that indirectly cools the slag through heat exchange surfaces, preventing direct contact between water and slag, thus eliminating leachate generation while maintaining cooling efficiency
Solution Approach 2:
The patent replaces the mechanical direct-contact cooling system with a thermal field-based indirect cooling system using heat exchange surfaces, eliminating the need for leachate collection and treatment infrastructure
2Reliability
If black slag is stored for 3-6 months in a large storage area, then complete extinguishing of residual quicklime is achieved, but extensive space and handling means are required
Solution Approach 1:
The patent applies preliminary rapid cooling treatment to the slag immediately after discharge, achieving quicklime stabilization in minutes rather than months, thereby eliminating the need for large long-term storage areas
Solution Approach 2:
The patent rushes through the traditional 3-6 month storage period by implementing intensive rapid cooling that achieves complete quicklime extinguishing in minutes, skipping the lengthy waiting period and associated storage space requirements
3Ease of manufacture
If multiple handling means are used to transport slag between areas, then treatment process is completed, but handling costs and treatment time are increased
Solution Approach 1:
The patent merges the cooling and stabilization operations into a single integrated rapid cooling process, eliminating the need for separate storage, handling, and waiting operations, thereby reducing both time and handling costs
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 method significantly reduces treatment time and space requirements, eliminates the need for leachate treatment plants, and produces a stable, high-quality secondary raw material with improved energy efficiency and safety.
Implementation Method 1
A method and apparatus for indirectly cooling black slag immediately after its generation using a rotating tubular reactor with indirect heat exchange
Data Source
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AI summary
Method for the treatment of black slag (1), which contains lime (CaO) or lime- based compounds, and which is generated in an electric furnace (2) to produce steel starting from scrap, characterized by the fact that said black slag is indirectly cooled, immediately after its exit from said electric furnace (2) or after its collection in a cauldron (3), for a period of time between about 10 minutes and about 45 minutes, preferably between about 10 minutes and about 30 minutes.