Steel slag high-temperate modification method

A high-temperature modification and steel slag technology, which is applied in cement production and other directions, can solve the problems of not realizing the activity of steel slag, achieve the effect of improving volume stability and gelling activity, reducing content, and increasing the content of active mineral silicate

Active Publication Date: 2014-09-03
CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen that the current research has not yet achieved a significant increase in the activity of steel slag and a large number of applications in cement

Method used

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  • Steel slag high-temperate modification method
  • Steel slag high-temperate modification method

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Experimental program
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Effect test

Embodiment 1

[0022] Take 50g of converter steel slag, and the silicon-rich material modifier is analytically pure SiO 2 , the dosage is 8% of the steel slag mass. Steel slag and SiO 2 After mixing evenly, put it in a MgO crucible, place it in a silicon-molybdenum rod heating furnace, raise the temperature to 1500°C for 30 minutes, cool down to 1250°C and keep it for 2 hours, then take out the slag sample and put it in water to quench it. The cooled slag sample was ball milled into powder, and the chemical composition and XRD spectrum were measured respectively. The results are shown in Table 2 and figure 1 .

[0023] Table 2 Doped with 8% SiO 2 The chemical composition of the modified steel slag wt%

[0024]

[0025] From figure 1 It can be seen that adding SiO 2 The modified steel slag contains no f-CaO, C 2 F diffraction peak, the main phase is dicalcium silicate C 2 S and magnesium iron ferrite (Mg, Fe) Fe 2 o 4 , and (Mg, Fe)Fe 2 o 4 is magnetic. The magnetic test resul...

Embodiment 2

[0032] Take 50g of converter steel slag, the silicon-rich material modifier is fly ash, and the dosage is 15% of the mass of the steel slag. After mixing the steel slag and fly ash evenly, put it in a MgO crucible, place it in a silicon-molybdenum rod heating furnace, raise the temperature to 1400°C for 30 minutes, cool down to 1200°C and keep it for 2 hours, then take out the slag sample and put it in water for rapid cooling. The cooled slag sample was ball milled into powder, and the chemical composition and XRD spectrum were measured respectively. The results are shown in Table 4 and Figure 4 .

[0033] Table 4 The chemical composition wt% of the modified steel slag mixed with 15% fly ash

[0034]

[0035] From Figure 4 It can be seen that there is no f-CaO, C in the modified steel slag with fly ash 2 F Diffraction peak, except the main phase dicalcium silicate C 2 S and magnesium iron ferrite (Mg, Fe) Fe 2 o 4 In addition, tricalcium aluminate Ca 3 al 2 o 6 a...

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Abstract

The invention discloses a method for performing high-temperature modification on converter steel slag by using a siliceous-rich material, and for performing magnetic separation to remove iron and obtain activated cement clinker, which belongs to the technical field of converter steel slag application and is mainly applied to cement and concrete. The method comprises the following steps: forging steel slag with the siliceous-rich material at 1500 DEG C to perform reconstruction reaction, sampling at the high temperature of 1250 DEG C, quenching, and subsequently performing magnetic separation to remove iron. The free calcium oxide (f-CaO) is eliminated, the volume stability of the steel slag is improved, the dicalcium ferrite (C2F) is decomposed, a part of iron-bearing minerals are separated through magnetic separation, the content of an activated mineral dicalcium silicate (C2S) in the steel slag tailings is increased, and an iron-making material with relatively high content of iron is obtained.

Description

technical field [0001] The invention relates to a method for high-temperature modification of steel slag, and mainly relates to a method for obtaining active cement clinker by high-temperature modification of converter steel slag and magnetic separation and iron removal. Background technique [0002] At present, a large amount of discharge and accumulation of converter steel slag has caused serious land and environmental pollution, as well as waste of resources. Steel slag contains gelatinous silicate mineral tricalcium silicate (C 3 S) and dicalcium silicate (C 2 S), thus opening up the application of steel slag in cement and concrete. However, the content of silicate minerals in steel slag is very small, and the crystal grains are large, the structure is compact, and the hydration and gelling activity is poor, so its activity is far lower than that of cement clinker, while dicalcium ferrite (C 2 The existence of F) and RO phase makes the grindability of steel slag worse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/147
CPCY02P40/10
Inventor 杨景玲张梅卢忠飞郭敏张亮亮黄世烁刘诗诚彭犇郭冉李晋岩
Owner CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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