Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for eliminating f-CaO in steel slag through water soaking hot closing

A technology of f-cao and steel slag, applied in the field of steel slag hot stewing, can solve the problems of hindering water penetration, insufficient saturation, inclusion of molten steel, etc., to achieve the effects of eliminating instability, good refining effect, and improving efficiency

Inactive Publication Date: 2018-11-30
WUKUN STEEL
View PDF3 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] When steel slag is used as a building material, there are strict requirements on f-CaO, water swellability, and metal content in steel slag. The lower the f-CaO content in steel tailings is, the lower the water swellability of steel slag is, and the better the stability is. In buildings, its stability can ensure the safety of buildings. Therefore, solving the problem of stability is the key and difficult point for steel slag to be used as building materials. Most of the converter slag f-CaO exceeds 5%, and conventional thermal braising technology exists Insufficient steam generation, insufficient saturation, etc. In addition, the final slag of the converter will inevitably contain molten steel, dead burnt burnt lime, and contains a large amount of C with a dense structure and a high melting point. 2 S, C 3 Complex compounds such as S, etc., the average content of free calcium oxide (f-CaO) in steel slag is difficult to digest to less than 3%, and the f-CaO index of steel tailing slag cannot meet the national standard GB / T20491-2006, GBT258242010, metallurgical standard YBT41872009 and other standards Requirements, it is difficult to be used in road engineering, concrete, cement and other building materials
[0003] In the conventional steel slag heat treatment process, the high-temperature saturated steam generated by pumping water is quickly drained from the upper part, and the steel slag in the middle and lower parts of the tank cannot be effectively contacted in the early and middle stages of hot stewing water pumping. Block the gap between the steel slag, hinder the normal and uniform penetration of the follow-up water to the middle and lower parts, and the water vapor generated cannot normally go up and interact with the steel slag, resulting in the phenomenon of high-temperature red slag still existing in the pool during the slag discharge process after heating, and the f-CaO digestion reaction unable to perform adequately
In addition, there are some steel slag heat treatment methods that require a certain steam pressure in the heat vessel, but this treatment method may form high temperature and high pressure in the airtight heat vessel, and there is a risk of explosion
When an explosion occurs, the slag cover is lifted, and the steel slag splashes everywhere, which is prone to steel slag injury accidents

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. The hot pot in the slag treatment workshop is built below the ground level, with a size of 5m×7m×4.5m. The inside of the hot pot is in direct contact with the hot slag, and the billet is fixed with the concrete wall by bolts. Filled with heat-resistant castables, it plays the role of heat insulation and auxiliary fixing. The upper part is equipped with a steam exhaust port, and the tank cover is equipped with a water atomization nozzle. After cleaning the hot stewing pool before loading slag, close the drain valve at the bottom of the hot stewing pool, lay steel slag with a thickness of about 720mm on the bottom of the hot stewing pool and dry and bake the bottom of the pool at a temperature above 135°C.

[0031] 2. After the converter smelting slag is completed, one can of slag is produced for each furnace of steel smelted and transported to the steel slag treatment workshop. 26 cans of slag are discharged. The average temperature of the slag is 1382°C, and the steel...

Embodiment 2

[0037] 1. The hot pot in the slag treatment workshop is built below the ground level, with a size of 5m×7m×4.5m. The inside of the hot pot is in direct contact with the hot slag, and the billet is fixed with the concrete wall by bolts. Filled with heat-resistant castables, it plays the role of heat insulation and auxiliary fixing. The upper part is equipped with a steam exhaust port, and the tank cover is equipped with a water atomization nozzle. After cleaning the hot stewing pool before loading slag, close the drain valve at the bottom of the hot stewing pool, lay steel slag with a thickness of about 710mm on the bottom of the hot stewing pool and dry and bake the bottom of the pool with a temperature above 146°C.

[0038]2. After the converter smelting slag is completed, one can of slag is produced for each furnace of steel smelted and transported to the steel slag treatment workshop. 28 cans of slag are discharged. The average temperature of the slag is 1428°C, and the stee...

Embodiment 3

[0044] 1. The hot pot in the slag treatment workshop is built below the ground level, with a size of 5m×7m×4.5m. The inside of the hot pot is in direct contact with the hot slag, and the billet is fixed with the concrete wall by bolts. Filled with heat-resistant castables, it plays the role of heat insulation and auxiliary fixing. The upper part is equipped with a steam exhaust port, and the tank cover is equipped with a water atomization nozzle. After cleaning the hot stew pool before loading slag, close the drain valve at the bottom of the hot stew pool, lay steel slag with a thickness of about 685mm on the bottom of the hot stew pool and dry and bake the bottom of the pool with a temperature above 172°C.

[0045] 2. After the converter smelting slag is completed, one can of slag is produced for each furnace of steel smelted and transported to the steel slag treatment workshop. 27 cans of slag are discharged. The average temperature of the slag is 1392°C, and the steel slag i...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
voidageaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for eliminating f-CaO in steel slag through water soaking hot closing. The method is characterized in that water is sprayed from the top of a hot closing container; the lower part is gradually soaked in water to generate saturated steam; saturated steam is simultaneously generated at the upper and lower parts in the container to realize the sufficient contact withf-CaO; along with the water filling, the water level in the container gradually rises; the contact with high-temperature water bath with the f-CaO in the refined steel slag is utilized, so that the elimination reaction of the f-CaO is sufficiently performed; after the steel slag is treated by the method, the f-CaO content in the steel tailing is stably lowered to a value below 3.0 percent; the inherent process defects of the conventional steel slag pressure-free hot closing treatment process are overcome; the instability of the steel slag is eliminated; the performance index meets the standardrequirements of industries of cement, building materials and the like; the method can be used for the fields of steel slag powder production, building material product production, road engineering and the like. The beneficial conditions are created for the resource utilization of the steel slag.

Description

technical field [0001] The invention belongs to the technical field of steel slag thermal braising, and in particular relates to a method for dissolving f-CaO in steel slag by soaking in water and thermal braising. Background technique [0002] When steel slag is used as a building material, there are strict requirements on f-CaO, water swellability, and metal content in steel slag. The lower the f-CaO content in steel tailings is, the lower the water swellability of steel slag is, and the better the stability is. In buildings, its stability can ensure the safety of buildings. Therefore, solving the problem of stability is the key and difficult point for steel slag to be used as building materials. Most of the converter slag f-CaO exceeds 5%, and conventional thermal braising technology exists Insufficient steam generation, insufficient saturation, etc. In addition, the final slag of the converter will inevitably contain molten steel, dead burnt burnt lime, and contains a la...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/06C21B3/08C04B5/00
CPCC04B5/00C21B3/06C21B3/08Y02W30/50
Inventor 文玉兵张卫强常跃昌杨美容李金柱杨春雷张润根方丽华李丽赵卫东
Owner WUKUN STEEL
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com