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A treatment method for high hydraulic activity blast furnace slag

A treatment method and a technology with high activity, which can be applied in cement production, etc., can solve problems affecting the hydraulic properties of blast furnace slag, achieve the effect of improving hydraulic activity and simple process

Active Publication Date: 2015-09-02
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the change of cooling granulation method will inevitably affect the hydraulic properties of blast furnace slag. At present, the quality of blast furnace slag obtained by dry granulation and its application effect in building materials are rarely reported.

Method used

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  • A treatment method for high hydraulic activity blast furnace slag

Examples

Experimental program
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Effect test

example 1

[0018] Set blast furnace slag composition, by mass percentage, CaO (38.6%), SiO 2 (43.7%), MgO (6.0%), Al 2 o 3 (8.7%), and (CaO+MgO) / (SiO 2 +Al 2 o 3 ) The mass percent ratio is 0.85, the mass percent ratio of CaO / MgO is 6.5, SiO 2 / Al 2 o 3 The mass percent ratio of is 5.

[0019] The powdered limestone and fly ash under the 80μm sieve after grinding and sieving are used for chemical composition analysis, which is used to prepare blast furnace slag raw meal, and pure chemical reagent SiO 2 Adjust the ratio of each component with MgO, and use EXCEL software to calculate the amount of each raw material that meets the set blast furnace slag composition when 500g of blast furnace slag raw material is used, which are limestone 295.5g, fly ash 66.2g, SiO 2 Reagent 122.1g, MgO reagent 16.3g, each weighed and mixed evenly to obtain blast furnace slag raw meal; put the blast furnace slag raw meal into a corundum crucible and calcined in a high-temperature furnace from room te...

example 2

[0022] Set blast furnace slag composition, by mass percentage, CaO (42.3%), SiO 2 (38.3%), MgO (3.7%), Al 2 o 3 (12.7%), and (CaO+MgO) / (SiO 2 +Al 2 o 3 ) The mass percent ratio is 0.90, the mass percent ratio of CaO / MgO is 11.5, SiO 2 / Al 2 o 3 The mass percent ratio of is 3.

[0023] The powdered limestone and fly ash under the 80μm sieve after grinding and sieving are used for chemical composition analysis, which is used to prepare blast furnace slag raw meal, and pure chemical reagent SiO 2 Adjust the ratio of each component with MgO, and use EXCEL software to calculate the amount of each raw material that meets the set blast furnace slag composition when 500g of blast furnace slag raw material is used, which are limestone 311.4g, fly ash 102.4g, SiO 2 Reagent 79.4g, MgO reagent 6.8g, each weighed and mixed evenly to obtain blast furnace slag raw meal; put the blast furnace slag raw meal in a corundum crucible and calcined in a high-temperature furnace from room tem...

example 3

[0026] Set blast furnace slag composition, by mass percentage, CaO (40.4%), SiO 2 (36.1%), MgO (11.5%), Al 2 o 3 (9.0%), and (CaO+MgO) / (SiO 2 +Al 2 o 3 ) The mass percentage ratio is 1.15, the mass percentage ratio of CaO / MgO is 3.5, SiO 2 / Al 2 o 3 The mass percent ratio of is 4.

[0027] The powdered limestone and fly ash under the 80μm sieve after grinding and sieving are used for chemical composition analysis, which is used to prepare blast furnace slag raw meal, and pure chemical reagent SiO 2 Adjust the ratio of each component with MgO, and use EXCEL software to calculate the amount of each raw material that meets the set blast furnace slag composition when 500g of blast furnace slag raw material is used, which are limestone 305.2g, fly ash 67.2g, SiO 2 Reagent 90.8g, MgO reagent 36.7g, each weighed and mixed evenly to obtain blast furnace slag raw meal; put the blast furnace slag raw meal into a corundum crucible and calcined in a high temperature furnace from r...

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Abstract

The invention discloses a high-hydraulic activity blast furnace slag treatment method and belongs to the technical field of building materials. The blast furnace slag comprises, by mass, 38-45% of CaO, 38-44% of SiO2, 4-12% of MgO and 8.5-13% of Al2O3, a ratio of the total mass of CaO and MgO to the total mass of SiO2 and Al2O3 is in a range of 0.85-1.15, a mass ratio of CaO to MgO is in a range of 3.5-11.5, and a mass ratio of SiO2 to Al2O3 is in a range of 3-5. The method provided by the invention comprises the following steps of fast and spirally pouring the blast furnace slag which is discharged from a blast furnace, contains the above components and has a temperature of 1450-1550 DEG C on a square-hole screen having square diameters of 5-15mm, simultaneously, carrying out air blasting to cool the blast furnace slag to a temperature below 500 DEG C in 1-2min, putting a cast iron plate in a place which is under the square-hole screen and 0.5-1m away from the square-hole screen so that the cast iron plate can receive fallen blast furnace slag granules, cooling the solid blast furnace slag granules to a normal temperature, collecting the cooled blast furnace slag granules, and grinding the blast furnace slag granules into powder as an active additive of cement. The method has simple processes, does not consume a water resource, realizes optimal selection of a chemical composition range of blast furnace slag for an air-cooling granulation technology and realizes production of air-cooled blast furnace slag having excellent hydraulicity.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a treatment method for high hydraulic activity blast furnace slag. Background technique [0002] Blast furnace slag is the main by-product of smelting pig iron. It is composed of soil components in iron ore (quartz, clay minerals, carbonate, apatite, etc.) and limestone (or dolomite) fluxes. React at a high temperature of 1400-1600°C to generate molten pig iron and molten slag. [0003] After the molten blast furnace slag is quenched and granulated, it forms a potentially hydraulically hardened granulated blast furnace slag, which is a potentially active glass structure material. At present, the quenching method used in traditional blast furnace slag is the water quenching method, which mainly uses high-pressure water to wash the slag to cool and granulate the molten slag, then separates the slag from water, and obtains water-quenched granulated blast furn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B5/00C04B7/147
CPCY02P40/10
Inventor 崔素萍王卉王亚丽董诗婕兰明章刘玲玲王剑锋
Owner BEIJING UNIV OF TECH
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