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A process for the production of reactive blast furnace slag

A technology of blast furnace slag and activity, which is applied in the field of preparation of active granular blast furnace slag to achieve the effect of enhancing activity and improving activity

Inactive Publication Date: 2009-04-08
COUNCIL OF SCI & IND RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is not possible to fully hydrate blast furnace slag without the addition of chemical additives by any method known to date

Method used

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  • A process for the production of reactive blast furnace slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 1kg of blast furnace slag is dry ground in a ball mill for 45 minutes. The particle size obtained after ball milling is 100 microns. 150g of ball-milled blast furnace slag was used as the feed, and water was used as a medium to wet-grind in a grinder for 10 minutes. The feed to water ratio is 1:1.5, and the feed to ball ratio is 1:10. The size of the ball is 2 mm, and the stirring rate is 1000 rpm. The slag obtained after the grinder treatment is evaluated according to its median particle size, shape, Zeta voltage, stable suspension volume (the volume occupied by 100g slag when there is excess water), and the start time of hydration. Determine the start time of hydration by standard isothermal conductance calorimetry. A slag slurry equivalent to 100 g of slag was taken from the grinder and hydrated at room temperature for 28 days. A 28-day uniform hydrated slag sample was used to measure the activity of the slag, and the activity was expressed as the thermogravimetric loss ...

Embodiment 2

[0055] 1kg of blast furnace slag was dry ground in a ball mill for 45 minutes. The particle size obtained after ball milling is 100 microns. 150g of ball-milled blast furnace slag is used as the feed, and water is used as a medium to wet-grind in a grinder for 15 minutes. The feed to water ratio is 1:1.5, and the feed to ball ratio is 1:10. The size of the ball is 2 mm, and the stirring rate is 1000 rpm. The slag obtained after the grinder treatment is evaluated according to its median particle size, shape, Zeta voltage, stable suspension volume (the volume occupied by 100g slag when there is excess water), and the start time of hydration. Use standard isothermal conductance calorimetry to determine the start time of hydration. The water was separated from the slurry obtained after the attritor treatment by filtration, and the material was dried in an electric furnace at 40°C for 6 hours, and then cooled to room temperature. 100 g of dry slag was mixed with excess water to be comp...

Embodiment 3

[0059] 1kg of blast furnace slag is dry ground in a ball mill for 45 minutes. The particle size obtained after ball milling is 100 microns. 150g of ball-milled blast furnace slag was used as the feed, and water was used as a medium to wet-grind in a grinder for 30 minutes. The feed to water ratio is 1:1.5, and the feed to ball ratio is 1:10. The size of the ball is 2 mm, and the stirring rate is 1000 rpm. The slag obtained after the grinder treatment is evaluated according to its median particle size, shape, Zeta voltage, stable suspension volume (the volume occupied by 100g slag when there is excess water), and the start time of hydration. Determine the start time of hydration by standard isothermal conductance calorimetry. A slag slurry equivalent to 100 g of slag was taken from the grinder and hydrated at room temperature for 28 days. A 28-day symmetrical hydrated slag sample was used to measure the activity of the slag, and the activity was expressed as the thermogravimetric l...

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Abstract

The invention particularly relates to a process for increasing the reactivity of ground granulated blast furnace slag using surface activation through short mechanical activation time (10-60 min) and it starts to hydrate in short time (48 h or less) when mixed with water without any chemical additive and completely hydrates in maximum 28 days forming cementitious product. The products produced by the process of present invention may be of different particle sizes and shapes, different specific surface areas, different surface charge (Zeta potential) and different reactivity. The reactive blast furnace slag shall be useful in Portland Slag Cement (PSC), Geopolymer, immobilisation and stabilisation of toxic wastes and newer nano-composite materials.

Description

Technical field [0001] The following description will focus on describing and determining the characteristics of the present invention and the way to implement the present invention: [0002] The invention relates to a preparation method of active granular blast furnace slag. The invention particularly relates to a method for improving the activity of finely ground granular blast furnace slag. The method utilizes the large-area contact between the grinding medium and the material in a high-energy grinder to activate the surface of the slag by mechanical activation. [0003] The products prepared by the method of the present invention can have different particle sizes and shapes, different specific surface areas, different surface charges (Zeta voltage) and different activities. The active blast furnace slag is useful in Portland slag cement (PSC), geopolymers, fixation and stabilization of toxic waste, and newer nanocomposites. Background technique [0004] Blast furnace slag has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/14C04B18/04
CPCC04B18/141Y02W30/91C04B20/026C04B18/14C04B18/04B82Y99/00
Inventor 拉凯什·库玛桑贾伊·库玛汤玛斯·卡洛杜特卡蒂尔·亚历克斯苏里亚·普拉塔普·梅赫罗特拉
Owner COUNCIL OF SCI & IND RES
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