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G85-grade ground iron steel slag and preparation method thereof

A technology of steel slag powder and steel slag micropowder, which is applied in cement production and other fields, and can solve problems such as cracking, low gelling activity, and low compressive strength

Active Publication Date: 2019-01-22
SHAOGUAN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when the steel slag powder is used as an auxiliary cementitious material, the gelling activity is low, resulting in large shrinkage of the concrete, low compressive strength, and easy cracking

Method used

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  • G85-grade ground iron steel slag and preparation method thereof
  • G85-grade ground iron steel slag and preparation method thereof
  • G85-grade ground iron steel slag and preparation method thereof

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preparation example Construction

[0026] The invention provides a preparation method of G85 grade iron and steel slag powder, comprising the following steps:

[0027] The converter steel slag is subjected to heat-stuffing treatment, and the iron is recovered by magnetic separation to obtain the converter heat-stuffing steel slag;

[0028] The hot stuffy steel slag of the converter is sequentially dried, crushed and ground to obtain steel slag powder;

[0029] After classifying the steel slag powder, the steel slag fine powder is obtained, and the classification is carried out in a cyclone air classifier;

[0030] The steel slag fine powder is mixed with slag powder to obtain G85 grade steel slag powder.

[0031] In the invention, the hot stuffy steel slag of the converter is recovered by magnetic separation after the hot stuffy treatment of the converter steel slag. In the present invention, the temperature of the hot stuffing treatment is preferably 600°C to 1000°C, more preferably 800°C to 900°C, most pref...

Embodiment 1

[0041]1) Using magnetically separated converter hot stuffy steel slag produced by a certain iron and steel plant as raw material, the main technical indicators are as follows: converter steel slag enters hot stuffy furnace at 800°C, magnetic field strength is 1200GS during magnetic separation, metal in converter hot stuffy steel slag The iron content is 2.8%, the f-CaO content is 4.75%, and the density is 3.29g / cm 3 , the chemical composition of converter hot stuffy steel slag is shown in Table 1, which contains other unpredictable unknown components;

[0042] Table 1 Main chemical composition of converter hot stuffy steel slag

[0043]

[0044] 2) Dry the hot stuffy steel slag of the converter until the moisture is less than 1%, crush it with a jaw crusher until the particle size is less than 4.75mm, and grind it with a ball mill (5kg / mill) to prepare steel slag powder. During the grinding process, add three Ethanolamine grinding aid, the dosage is 0.04%, and the prepared...

Embodiment 2

[0056] 1) Using magnetically separated converter hot stuffy steel slag produced by a steel plant as raw material, the main technical indicators are as follows: the temperature of converter steel slag entering the hot stuffy digestion furnace is about 800°C, and the magnetic field strength during magnetic separation is about 1200GS; the remaining hot stuffy steel slag The metallic iron content is 2.8%, the f-CaO content is 4.75%, and the density is 3.29g / cm 3 ; The chemical composition is shown in Table 1;

[0057] 2) Dry the hot stuffy steel slag of the converter until the water content is less than 1%, crush it with a jaw crusher until the particle size is less than 4.75mm, and grind it with a ball mill (5kg / mill) to prepare steel slag powder. During the grinding process, add Triethanolamine grinding aid, the dosage is 0.04%; the prepared Blaine specific surface area is 322m 2 / kg of steel slag powder;

[0058] 3) The steel slag powder is sent to the cyclone airflow classif...

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Abstract

The invention provides G85-grade ground iron steel slag and a preparation method thereof, and belongs to the technical field of building materials. According to the G85-grade ground iron steel slag and the preparation method thereof, converter steel slag is used as a raw material, and after the converter steel slag is subjected to thermal curing treatment, magnetic separation, drying, crushing, grinding and vortex air flow classification treatment, the treated converter steel slag and ground slag are mixed to prepare the G85-grade ground iron steel slag. The prepared G85-grade ground iron steel slag is up to specifications in ground iron steel slag (GB / T28293-2012) standards, the cementitious activity is high, after the G85-grade ground iron steel slag and slag are compounded, a cement slurry pore structure can be optimized, and a steel slag high added value resource utilization level is raised.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a G85 steel slag powder and a preparation method thereof. Background technique [0002] Steel slag is the solid waste discharged during the steelmaking process, and the discharge of steel slag is generally 15-20% of the steel output. A large amount of steel slag is piled up idle, which not only seriously pollutes the environment but also occupies land. Therefore, it is urgent to reduce the amount of steel slag, make secondary resources and use it efficiently. The development of steel slag as cement admixture or concrete admixture is likely to become an important way of its efficient and high value-added utilization. [0003] Steel slag is rich in C 3 S and C 2 Minerals such as S, which are industrial waste residues similar to poor-quality Portland cement clinker, have the potential to be used as raw materials for cement and concrete production. The use of steel sla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/147C04B5/00
CPCC04B5/00C04B7/147Y02P40/10
Inventor 贺图升赵三银黎载波刘洋赵旭光刘锦州
Owner SHAOGUAN COLLEGE
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